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Wideband circularly polarized antenna loaded with π‐shaped dipole for millimeter‐wave applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Yikai Zheng, Ke Han, Zhuoxi Jiang, Ze Yan
This paper presents a novel wideband circularly polarized antenna that is fed by substrate‐integrated waveguide. Based on the design of placing a pair of chamfered semicircular patches above a slot, a ‐shaped radiator is introduced between the semicircular patches. Multiple resonance points are generated by the combination of the entire radiating structure and a dumbbell‐shaped slot, resulting in improved
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Accurate determination of sorghum origin based on hyperspectral imaging technology and machine learning Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Guangxia Zhao, Qi Wang, Pengfei Zhang, Zhuopin Xu, Liwen Tang, Xiaohong Li
Sorghum is an important crop, and the quality of sorghum of the same variety from different geographic origins varies greatly. This study focuses on HongYingZi sorghum from five distinct origins, employing a combination of hyperspectral imaging (HSI) technology and machine learning algorithms to investigate methods for classifying sorghum origin. Multiplicative scatter correction and the Savizkg‐Golay
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A spaceborne broadband circularly polarized conformal antenna for UHF band applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-14 Xiaotian Wang, Min Liu, Fan Lu
A Spaceborne broadband circularly polarized conformal antenna for ultra high frequency band is presented. The antenna mounted on the outer surface of the circular arc spherical cone satellite works in 390–450 MHz frequency band, and has the characteristics of broadband, light miniature. The measured results for the antenna demonstrate an impedance bandwidth of 32.5% from 360 to 500 MHz, an axial ratio
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Meta‐atom design and communication prototype for wideband reconfigurable intelligent surface Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 Yuan Liu, Hongtao Zhang, Li Deng
Existing research on reconfigurable intelligent surfaces (RIS) has mainly focused on narrowband applications due to limitations in programmable metasurfaces and field prototype realization. This letter introduces a wideband RIS meta‐atom consisting of a single‐layer frequency selective surface supported by a dogbone‐shaped patch, ensuring a stable linear phase interval around the resonant frequency
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An arrayable low‐profile antenna with a broad bandwidth Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 RongLin Li, Wang Li, Song Lin, Yuehui Cui
An arrayable dual‐polarized antenna is proposed in this paper, which exhibits a low profile and broad bandwidth. A metasurface and a square ring are introduced to realize the broadband operation of the low‐profile dual‐polarized antenna. The total size of the broadband antenna is (where is the wavelength at the lowest frequency of the operation band [1.31 GHz] in free space), suitable for use as an
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Advancing CO2 to CO conversion: Detailed impact analysis of atmospheric molecules in an ultrashort pulse laser filament plasma reactor Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-13 Luping Wang, Lunhua Deng, Qian Huang, Xuanbing Qiu, Chuanliang Li, Sanjun Zhang
Capturing carbon dioxide (CO2) and transforming it into valuable fuels offers a dual benefit: the potential to reduce atmospheric CO2 levels and decrease our dependency on fossil fuels. Plasma‐assisted CO2 to carbon monoxide (CO) conversion stands out within the various CO2 recycling methods, with research primarily emphasizing its energy efficiency and conversion efficacy. However, investigations
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Erratum to “Wideband miniaturized circularly polarized magnetoelectric dipole antenna array for millimeter‐wave applications” Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-12
Meng W, Sun Y, Li Y, Xu J. Wideband miniaturized circularly polarized magnetoelectric dipole antenna array for millimeter-wave applications. Microw Opt Technol Lett. 2024;66:e34086. doi:10.1002/mop.34086 (1) FIGURE 1 Geometry of the proposed CP ME-dipole antenna (A) 3-D model. was incorrect. The corrected figure is provided here: FIGURE 1 Geometry of the proposed CP ME-dipole antenna (A) 3-D model
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Graphene‐based transparent and tunable plus‐shaped refractive index sensor for detecting waterborne bacteria Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-12 Shobhit K. Patel, Yagnesh Parmar, Osamah Alsalman, Juveriya Parmar
Waterborne bacteria cause many dangerous diseases as well as several health‐related issues hence detection of them is a global challenge today. A plus‐shaped graphene sensor to detect waterborne bacteria is presented in this paper. The detection mechanism is based upon the refractive index difference between waterborne bacteria sample and pure water which causes a change in resonance peak in the transmittance
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Design of compact balanced filters with wide DM upper stopband and CM rejection band based on semi‐circular patch Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-11 Xuedao Wang, Zai‐Cheng Guo, Feng Huang, Jianpeng Wang, Lingling Wang
A new design approach to achieve compact size and high common‐mode (CM) suppression of balanced filters is proposed with two back‐to‐back microstrip semi‐circular patch resonators. In feeding structures, metalized via holes are adopted to vertically feed patches by differential pairs. Then, TM11 mode is excited and TM31 mode can be rejected, resulting in wideband differential‐mode (DM) harmonic rejection
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Electrically tunable substrate integrated waveguide equalizer based on PIN diodes Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Hao Peng, Chen Zhang, Yu Liu, Serioja Ovidiu Tatu, Tao Yang
In this letter, a novel design of electrically tunable substrate integrated waveguide (SIW) equalizer, based on PIN diodes, is proposed. Compared to previous SIW equalizers, this one introduces PIN diodes that exhibit varying impedance under different direct current (DC) voltages. The equalizing values of the SIW equalizer are directly linked to the DC voltage applied to the PIN diode within a specific
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A broadband transparent antenna applied in indoor mobile communication system Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Zibin Weng, Jia Liu, Youqian Su, Xiaoming Wang, Bo Yan
This paper proposes a broadband optical transparent antenna using a transparent conductor film on a transparent polyethylene terephthalate (PET) substrate. The planar wide‐slot antenna coupling fed by microstrip has a wide impedance bandwidth, so it is selected to design the transparent antenna. The upper surface of the PET substrate is a microstrip line with a fork‐shaped tuning branch, and the lower
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Self‐equalized linear‐phase microstrip bandpass filter based on negative group delay parallel‐coupled three‐line units Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-09 Awei Zhang, Jinping Xu, Liu Zhiqiang
A self‐equalized linear‐phase microstrip bandpass filter (BPF) utilizing negative group delay (NGD) parallel‐coupled three‐line (PCTL) units is presented in this letter. The NGD PCTL unit possesses an NGD valley in its frequency response of group delay (GD). By a combination of two or more NGD valleys, the sharp positive GD peaks at passband edges of a conventional coupled‐line BPF are counterbalanced
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Design and numerical modeling of chalcogenide parabolic‐core waveguide for on‐chip supercontinuum generation extending from near‐IR region to mid‐IR region Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-07 Drishti Singh Tomer, Ajeet Kumar
We present the design and computational examination of a waveguide structure with a parabolic core, implemented in AsSe2 chalcogenide glass. This structure aims to generate a mid‐infrared (mid‐IR) supercontinuum (SC) spectrum, covering the wavelength range of 1.4−7.6 µm. It includes molecular fingerprint region as well as earth's atmospheric transparent window. A pulsed laser providing pulses of peak
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A new X‐band frequency up‐converter design for LEO satellite ground station utilizing a single superheterodyne Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-06 İsmail Şişman, Tugba Haykir Ergin, Duygun Erol Barkana
In this work, the advancing wireless revolution (AWR) modeling and Microwave Office tools are used to develop and execute a broadband up‐converter system. Before sending the input frequency to the antenna interface, a radio frequency block upconverts it once to the appropriate frequency level. Mixing blocks, oscillators, amplifiers, step attenuators, isolators, and filters are included. The input frequency
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A compact polarization independent stop band frequency‐selective surface for WLAN shielding Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-05 Rajesh Natarajan, Ramprabhu Sivasamy, Aarthi Gunasekar
This paper presents the design and prototype development of a compact frequency‐selective surface (FSS) for shielding WLAN signals. The FSS unit‐cell geometry is evolved by modifying the arms of the conventional crossed dipole element. The footprint of the unit cell is only 6 mm × 6 mm × 1.6 mm. The proposed FSS offers stop band characteristics at 5 GHz for both transverse electric (TE) and transverse
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Adjustable anomalous hollow vortex beam and its properties Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Xu Guo, Yansong Song, Keyan Dong, Lei Zhang
A new beam named adjustable anomalous hollow vortex beam (AAHVB) is proposed, and the expressions of an AAHVB in uniaxial crystal are derived. The evolutions of intensity distributions of an AAHVB in free space and uniaxial crystal are investigated. The relationships between intensity distributions with beam parameters, uniaxial crystal, and distance are analyzed in detail. It is found that intensity
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A 1.33–1.88 GHz microfluidically tunable filter with controllable coupling Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Weihang Huang, Hongji Li, Jieen Xie, Ruisen Chen, Jing‐Yu Lin, Sai‐Wai Wong
In this article, a continuously microfluidically tunable filter using two microstrip resonators is proposed. By injecting different amount of water into the tubes, the resonant frequency as well as coupling intensity between two resonators can be controlled. As a result, the fractional bandwidth (FBW) of the proposed band can keep constant when tuning the frequency. As far as the authors know, most
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A programmable solar‐powered radio frequency transmitter Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Qian Chen, Zilin Qiao, Juliang Lv, Yong Ye, Xingang Ren, Wei Wang, Zhixiang Huang, Lixia Yang, Yingsong Li
This paper proposes a programmable solar‐powered radio frequency (RF) transmitter. It employs a novel five‐layer structure that effectively integrates solar cells, active circuits, and broadband antenna. This design can directly emit RF signals without the need for additional power supply, enabling efficient energy conversion and transmission. In addition, a U‐shaped coupling line model is introduced
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2–26.5 GHz GaN ultra‐wideband amplifier with over 2 W output power Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-04 Wei Dai, Bowen Tang, Junting Lu, Xiaodong Feng, Yuehang Xu
A 2–26.5GHz broadband amplifier monolithic microwave integrated circuit (MMIC) based on the 0.15 μm GaN high electron mobility transistor process has been developed. The broadband amplifier adopts a two‐stage distributed amplifier cascade structure, which improves the gain of the broadband amplifier. Further, the capacitive coupling is used to improve the gain bandwidth product of the power amplifier
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Real‐time demonstration of photonics‐based THz wireless fronthaul integrated with fiber‐optic mobile fronthaul Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Sang‐Rok Moon, Sooyeon Kim, Eon‐Sang Kim, Minkyu Sung, Seung‐Hyun Cho
A photonics‐based terahertz (THz) wireless fronthaul is proposed, and its feasibility is investigated by real‐time demonstration. The proposed wireless fronthaul can be simply integrated into existing fiber‐optic fronthaul, to serve as a complementary or emergency network. An optical signal can be converted into a THz wireless signal by photonics‐based THz‐signal generation technology, utilizing a
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A low‐cost and multifunctional long‐life anthropomorphic head phantom for microwave brain imaging systems Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Mahdi Salimitorkamani, Mehdi Mehranpour, Gokhan Cansiz, Sulayman Joof, Mehmet N. Akinci, Ibrahim Akduman, Hayrettin Odabasi
To assess the performance of microwave brain imaging (MWBI) systems, an anthropomorphic multifunctional head phantom with long life, low cost, and reliable dielectric properties over the intended frequency range is a principal requisite. A solid head model has been developed using a mold casting method, incorporating graphite, aluminum oxide, carbon black powder, and brass powder with epoxy/hardener
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Design and analysis of a freeform surface lens coupler applied in hollow‐core photonic crystal fiber resonant optic gyros Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-03-01 Wen Fan, Ran Bi, Heliang Shen, Xuan She, Kan Chen, Xingfan Chen, Xiaowu Shu
In this study, a novel freeform surface lens coupler is designed to realize the coupling functions in the hollow‐core photonic crystal fiber (HCPCF) resonator optical gyroscope. One surface of the lens is an ellipsoid. Coupling of the two HCPCF loop's ports can be directly accomplished via reflection on the ellipsoid surface. The other surface of the lens is the Biconic Zernike surface. Transmitting
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An improved gain and directivity design of an antipodal Vivaldi antenna for ultra‐wideband detection Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Jingjing Wang, Yongcheng Li, Jianwei Liu, Yucheng Fan, Kangming Hou, Huaqiang Xu
A novel antipodal Vivaldi antenna (AVA) is proposed to achieve improved gain and directivity. To enhance the bandwidth of the antenna, a series of equal‐sized slots are etched onto the patch surface. Additionally, a dielectric lens with a fan‐shaped structure is integrated along the patch openings to boost gain. The length of the lens which will affect the radiation characteristics of the antenna in
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Wideband filtering power dividers with/without notch band Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Ali Kursad Gorur, Engin Dogan, Ceyhun Karpuz, Adnan Gorur
Low loss and compact wideband filtering power dividers (WB‐FPDs) with/without notch band are proposed. The WB‐FPDs are designed using wideband bandpass filter based on asymmetric stepped‐impedance resonator (SIR). Parallel coupled microstrip lines are used to create both wideband filtering characteristic and two additional transmission poles. A notch band can be generated at upper passband edge by
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Liquid‐level sensor based on Michelson interferometer with double hook structure Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Beibei Mao, Yongfeng Wu, Weihao Cheng, Rahat Ullah, Jianxin Ren, Yaya Mao, Tingxuan Yuan, Tutao Wang
A new type of Michelson interferometer (MI) based on a double hook structure is proposed for measurement of liquid level and temperature. The optical fiber MI based on the double‐hook structure is fabricated using a hydroxide flame heating device. Furthermore, the angle and sensing length of the double‐hook structure can be controlled by a rotating platform. The sensor is fixed on a ruler, which is
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Hexagonal ring‐inspired antenna for UWB and V2X applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-29 Rahul K. Garg, Suvadeep Choudhury, Raghuvir S. Tomar
This paper presents a small‐sized, planar antenna fabrication for ultra‐wideband (UWB) and vehicle‐to‐everything (V2X) applications. The design is inspired by a hexagonal ring, providing an UWB bandwidth of 16.61 GHz (from 3.33 to 19.94 GHz) and a fractional bandwidth of 142.75%. A suitably placed inverted‐U slot in the feed line helps in achieving the WLAN notch band (from 5.04 to 6.01 GHz). The overall
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A dual‐band dual‐polarized omnidirectional patch antenna for on‐body application Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-28 Guo‐Ping Gao, Dan Wang, Ge Ma, Shi‐Chen Wang, Zhi‐Heng Dou, Bin Hu
Aiming at the 3.5 GHz world interoperability for microwave access band and 5.8 GHz industrial scientific medical band, a dual‐band antenna operating in omnidirectional mode is proposed. The antenna uses a single‐layer dielectric substrate made of FR‐4, which is cheap and easy to process. It uses circular patches and metal branches to generate orthogonal electric fields to achieve circular polarization
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Optimization of passive Q‐switched fiber laser employing MAX phase chromium aluminum carbide film Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-27 Mustafa Mohammed Najm, Pei Zhang, Aya A. Almukhtar, Jassim K. Hmood, Mohammed Najm Abdullah, Sulaiman Wadi Harun
In this work, we proposed a mechanical exfoliation technique to compose a saturable absorber (SA) from MAX phase chromium aluminum carbide (Cr2AlC). The performance of a passive Q‐switched erbium‐doped fiber laser (EDFL) based on Cr2AlC‐SA was experimentally demonstrated. The optical properties of SA showed appropriate nonlinear absorption, with a non‐saturable absorption of 92.5%, and saturable absorption
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Isolation enhancement of distinct element dual polarized compact MIMO antenna for 5G/WLAN application Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-26 Cholavendan Munusami, Rajeshkumar Venkatesan
A novel‐shaped dual‐polarized low‐profile multiple‐input multiple‐output (MIMO) antenna with high isolation is proposed for 5G/WLAN application. An 8‐element MIMO antenna design comprises two unique planar radiators (chamfer, circular). Each radiator has dual feed and dual polarization characteristics. The prototype is fabricated with an FR‐4 dielectric substrate. A decoupling structure maintains desirable
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Wideband miniaturized circularly polarized magnetoelectric dipole antenna array for millimeter‐wave applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-23 Wenwen Meng, Yurong Sun, Yuanyuan Li, Juan Xu
A wideband and miniaturized circularly polarized (CP) magnetoelectric (ME) dipole antenna is proposed. Two pairs of rotationally symmetric patch structures replace the rectangular structure of the original linearly polarized ME dipole, generating a rotating electric field that results in CP‐radiated waves. And the magnetic dipole is modified to broaden the impedance bandwidth (IBW) and the axial ratio
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Doppler effect‐based low‐Earth orbit satellite constellation parameters Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-23 Kaouther Boumalek, Skander Aris, Malek Benslama
The present study focuses on the manifestation of the Doppler effect in low‐Earth orbit (LEO) satellite constellations with laser inter‐satellite links (LISLs). In this letter, the LEO satellite constellation parameters that influence the variation of the Doppler effect in LISLs are presented. The LEO satellite constellation configurations that perform LISLs with less possible Doppler effect could
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Beam‐tilting antenna with low profile and increased gain for 5G mobile applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-23 Kunooru Bharath, N. Srujana Vahini, Rama Krishna Dasari, Mahesh P. Abegaonkar, V. M. PandhariPande
A low‐profile beam‐tilting antenna with enhanced gain at millimeter‐wave frequency for future 5G mobile applications is designed, and measured results are presented. The mechanism of beam tilting is explained using the proposed printed rectangular loop dipole antenna (RLDA) with three directors that operate at 37 to 40 GHz. The proposed design includes a printed RLDA, one rectangular director sandwiched
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A wide locking range injection-locked frequency divider with an auto-adjusted injection bias Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-17 Jingjing Lv, Yajie Wu, Li Du, Yuan Du
This paper presents a Ku-band divide-by-2 direct injection-locked frequency divider (ILFD) with a wide locking range (LR) and high input sensitivity. The proposed ILFD incorporates an auto-adjusted injection bias that uses a power detector (PD) to convert the power of the injected signal to a DC voltage. The bias voltage of the injection transistor is then auto-adjusted in response to the output of
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Research on electromagnetic scattering characteristics of dipole clusters Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-17 Haohui Yang, Yang Fu, Helin Yang, Fan Ding, Shiju Chen
This paper equates chaff clouds to dipole clusters and studies the electromagnetic scattering problem of dipole clusters based on the linear method of moment (LMM) that solve the electric field Integral equation with the pulse basis function. Firstly, the radar cross section (RCS) of three dipole elements is calculated. The dipole element is divided into 11 segment line units using pulse basis functions
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Design of a broadband high-efficiency extended resistive continuous Class-B/J power amplifier with novel drain voltage waveforms Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-17 Xin He, Jin Sheng Dong, Yong Mu Yang, Xin Xu, Xian Qi Lin
This article presents an extended resistive continuous broadband Class-B/J (ERCB/J) power amplifier (PA) that incorporates two newly designed parameters in the drain voltage waveform. The incorporation of these newly designed parameters enables the PA to achieve a lower degradation rate of efficiency and output power over a wide bandwidth. To validate the effectiveness of the proposed method, a PA
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Novel design of compact quad‐band divider using stepped impedance coupled lines Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-19 Xinhuai Wang, Xin Li, Yin Xu, Wen Wang, Hongyang Xu, Le Kang
This letter presents a novel compact quad‐band power divider using stepped impedance coupled lines. The power divider adopts a stepped impedance coupling line with two transmission zeros as the primary transmission unit and forms a flexible quad‐band in the architecture of the second‐order power divider design through clever impedance matching and transmission zeros design. In addition, the complete
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Design of polycarbonate‐based dual‐band conformal frequency‐selective surface for 4G/5G shielding applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-19 Singaram Manokaran, Ramprabhu Sivasamy, V. Harish Muthukaruppan, E. Kaushik Roshan
In this work, a compact conformal swastik frequency‐selective surface (FSS) has been proposed for shielding 4G/5G signals. The resonating unit of FSS is realized using swastik geometry. The proposed FSS offers resonance at 1800 MHz for 4G band and 3300 MHz for sub‐6 5G band. The unit‐cell dimension is 0.11λ0 × 0.11λ0, where λ0 is the free space wavelength corresponding to the lowest resonating frequency
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Design a wideband high-efficiency continuous class-GF power amplifier based on a source second harmonic manipulation architecture Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-14 Xuefei Xuan, Zhiqun Cheng, Zhiwei Zhang, Ruizhe Zhang, Tingwei Gong, Chao Le
In this paper, a novel source second harmonic manipulation architecture achieving second harmonic control at device input is proposed to solve the issue of reduced operating efficiency of power amplifiers (PAs) caused by the input nonlinearity in continuous Class-GF mode. The key to the proposed architecture lies in the use of a compact multibranch network to match the source second harmonics of the
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High efficiency holographic impedance metasurface for dual circular polarized OAM waves Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-14 Hui-Fen Huang, Zi-Yi Xiang
This paper proposes a high aperture efficiency (AE) small size tensor holographic impedance metasurface (THIMS), which has the ability to create circular polarized (CP) high purity orbital angular momentum (OAM) multi-beams with flexibly independent control of the individual beam direction, polarization and OAM mode. The tensor unit cell is a cross-slotted circular patch. We design a THIMS at 14.6 GHz
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Dynamically tuning and reconfiguring microwave bandpass filters using optical control of switching elements Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-13 Peizhao Li, Ehsan Zahedi, Yu Shi, Yijing Deng, Lei Liu
We report a novel approach for dynamically tuning and reconfiguring microwave bandpass filters (BPFs) based on optically controlled switching elements using photoconductivity modulation in semiconductors. For a prototype demonstration, a BPF circuit featuring a second-order design using two closely coupled split-ring resonators embedded with multiple silicon chips (as switching elements) was designed
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Mutual coupling reduction in antenna arrays using the novel mushroom electromagnetic band gap and defected ground structure Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-14 Wenchi Chang, Shuli Chen, Ke Chen, Pengfei Yu, Qing Huo Liu
The multi-input and multi-output antennas have been developed to increase the communication capacity in many applications, but they also bring coupling problems between array elements, which will seriously affect their performance. Therefore, it is of great significance to reduce mutual coupling between array elements. In this article, a novel mushroom electromagnetic band gap (EBG) and defected ground
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Design of dispersion-reconfigurable phaser using stepped-impedance line Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-13 Haoling Lei, Yi Huang, Chaijie Duan, Qingfeng Zhang
This paper proposes a dispersion-reconfigurable reflection-type phaser based on the stepped-impedance microstrip line structure. By configuring “ON” and “OFF” states of switches, the proposed phaser exhibits positive-slope, negative-slope, and zero-slope linearly dispersive group delay responses. For proof-of-concept demonstration, we use line connection/disconnection to mimic the ON/OFF states of
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On the design of ideal pattern diversity antennas with low mutual coupling using the golden angle concept Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-13 Bharath Reddy Gudibandi, Rajashekar Nuthakki Venkata, Harish Adhithya Murugan, Sriram Kumar Damodaran
In this paper, we come up with a unique technique to generate the ideal pattern diversity with the help of 24 Vivaldi antennas. With the help of a mathematical concept called golden angle, the 24 antenna elements are arranged in such a way that the radiation patterns will never overlap and the mutual coupling will be very low. It is also verified from the simulations and the measured results that the
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Optically transparent and angularly stable broad-stopband frequency selective surface for millimeter wave electromagnetic interference mitigation Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-14 Li Tang, Chengrong Wang, Liping Yan, Richard Xian-Ke Gao, Xiang Zhao, Changjun Liu
An optically transparent and angularly stable frequency selective surface (FSS) with a broad stopband is introduced for addressing millimeter wave (mmW) electromagnetic interference. The unique FSS unit cell pattern incorporates a cross patch with Y-shaped branches, effectively broadening the bandwidth and enhancing the angular stability. Utilizing transparent conductive indium tin oxide deposited
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Comparative analysis of X-band FSS fabricated by inkjet printing and conventional etching technique Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-13 Jothinayagam Inbarani, Esakkimuthu Manikandan
An investigation of a single-layer band-stop frequency selective surface (FSS) is designed and analyzed for X-band application. The proposed FSS design primarily involves a cross-shaped conductive patch with four square slots on each corner, and it is fabricated on the 3D-printed polylactic acid (PLA) substrate. The design is resonating at 12 GHz with an insertion loss greater than 60 dB. The 10 dB
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Inverse design of reflective metasurface antennas using deep learning from small-scale statistically random pico-cells Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-11 Xi Chong You, Feng Han Lin
A small-scale data-selection method is proposed for deep-learning-based inverse design of reflective metasurface antennas (MAs). The overall design process involves discretization, coding, data selection, simulation, feature representation, training, prediction, and metasurface design. Unlike conventional method that selects the training data empirically after simulation from a large quantity of unit
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Design of low-pass filter with improved equalization based on lossy grounded spoof surface plasmon polaritons Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-11 Chenhao Wang, Xiaomin Shi
A new method for designing multifunctional low-pass filter with controllable equalizing capability is presented in this letter. By constructing the novel unit cell, namely, loading surface mount resistor on the grounded spoof surface plasmon polaritons (SSPPs), the filter not only achieves filtering and equalizing functions at the same time, but also improves the equalizing response in the low-band
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A segmented periodic slot array leaky-wave antenna for beamforming applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-08 Mohamed K. Emara, Shulabh Gupta
A segmented periodic slot array leaky-wave antenna (LWA) is proposed for beamforming applications. The LWA consists of N$N$ segments, each with a unique propagation constant achieved through varying periodicity and slot size. By using segments with different propagation constants, the proposed LWA can achieve beamforming such as flat-top beams and side-lobe level (SLL) reduction. The LWA is based on
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Three-element ultrawideband MIMO antenna based on shared-radiator structures with high efficiency and gain Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-08 Yan Mei Xue, Yuan Jun Li, Zhi-Xia Du, Liang Hua Ye
This letter presents a novel three-port ultrawideband (UWB) multi-input-multi-output (MIMO) antenna that covers the sub-6 GHz (between 1.7 and 6 GHz) frequency band for wireless device applications. The proposed antenna consists of two parts: a dipole and two centrosymmetric slot antennas with shared structures. The radiating arm of the dipole can be reused as the large slot ground without increasing
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Laser power stabilization system based on variable universe fuzzy proportional-integral-differential Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-08 Hong-Liang Ma, Yu Zhang, Tao Yang, Yu-Xiang Guo, Juan-Juan Ji, Qi-Lei Zhang, Shen-Long Zha, Qiang Liu, Gui-Sheng Jiang
A variable universe fuzzy proportional-integral-differential (PID) algorithm was designed and first application for a laser power stabilization system. To validate the algorithm's effectiveness, it is applied to the simulation model of Simulink and the experimental system based on an acousto-optic modulator. The results demonstrate that the variable universe fuzzy PID presents higher control precision
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Solid materials characterization using split ring resonators enclosed by power divider Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-07 Pejman Mohammadi, Ali Mohammadi, Ali Kara
A highly sensitive microwave sensor for solid material characterization is proposed. A novel design consisting of split ring resonators (SRRs) within a three-port power divider is developed. The three-port junction is employed as the host to provide two output channels, and SRRs are loaded through electric coupling to the power divider as the sensing area. The SRRs are located symmetrically so that
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A dielectric-loaded broadband single- and dual-polarized slot antenna with low profile and low cross-polarization Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-07 Shu-Qing Zhang, Hongji Li, Ye-Cong Lin, Sai-Wai Wong
A dielectric-loaded slot antenna with the characteristic of broadband, low profile, and low cross-polarization is presented. The antenna incorporating a low permittivity (εl=4.1${\varepsilon }_{l}=4.1$) and multiple high permittivity (εh=22${\varepsilon }_{h}=22$) rectangle dielectric is fed by two rectangle slot, which generates three slot modes and achieves measured 10 dB impedance bandwidth of 88%$
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Front-to-back ratio improvement of a compact base-station antenna for 5G NR applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-07 RongLin Li, Yuanyun Huang, Jiaying Du, Yuehui Cui
The front-to-back ratio (FBR) of a compact dual-polarized antenna is improved for 5G new radio (NR) base-station applications. A rim made of partially reflective surfaces is introduced to improve the FBR. A meta-surface and a parasitic element are employed to lower the antenna height. The dual-polarized base-station antenna with improved FBR features a compact size of 0.64λL×0.64λL×0.11λL$0.64{\lambda
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Self-isolated quadruplexing SIW antenna with extremely low frequency ratio for C-band applications Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-07 JayaPrakash V., Chandu DS
In this letter, an substrate integrated waveguide -based self-quadplexing antenna based on a modified Jerusalem cross-shaped slot is presented. By introducing different lengths of the slots of Jerusalem cross, the antenna operates at four different closely spaced resonant frequencies 4.08, 4.37, 4.61, and 4.97 GHz. The proposed quadplexer antenna achieved a minimum port isolation of ≥$\ge $20 dB between
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High common-mode rejection balanced bandpass filter using novel coupling scheme and source-loaded coupling technique Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-05 Sainan Cao, Wang Liu, Xuehui Guan, Baoping Ren, Shaohong Xu
A balanced bandpass filter (BPF) with a novel coupling scheme and source-loaded coupling (SLC) technique is proposed. The J-inverter is directly connected to the source or load, and the single-band cell (SBC) is fed by the J-inverter. Meanwhile, the J-inverter is also coupled to a resonator. Equivalent differential-mode (DM) and common-mode (CM) circuits are presented, and their ideal frequency responses
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A novel wideband compact circularly-polarized metasurface antenna for modern vehicular communication systems Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-05 Dongxu Chen, Kuo-Sheng Chin, Wanchen Yang, Huayan Jin, Yue Cao, Jiaqi Chen, Ning Cao
In this work, a wideband compact circularly polarized (CP) antenna using a novel polarization-rotated metasurface (MS) structure is presented. First, the polarization-rotated MS structure is designed by using a complementary L-shaped MS unit cell. By optimizing the width of diagonal gap and radius of corners, the amplitude and phase of its surface impedances along ±45° can be adjusted respectively
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A low-profile high-gain filtering patch antenna with harmonic suppression Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-05 Xiao Gao, Jianping Zhao, Di Qiao, Juan Xu
A compact high-gain filtering patch antenna with harmonic suppression characteristic is proposed. The antenna mainly contains a coupled transmission line and a central rectangular patch. The capacitive coupling between the coupled transmission line and the rectangular patch generates a radiating null at high frequencies. Then, acrossing the hybrid coupling principle, the structure of the microstrip-to-slotline
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A low-profile wideband microstrip patch antenna using double half-mode resonances Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-05 Long Jin, Ruohan Zhang, Yangmiao Lin, Xuyang Zhang, Huaiyuan Tang, Min Li
This paper presents a miniaturized broadband microstrip patch antenna with a simple geometry. The radiation patch of this antenna comprises two rectangular patches with slightly different sizes, one side of each patch is grounded by metal via-holes. Two rectangular patches are connected by a microstrip line and fed by a single port. Two rectangular patches produce two closely resonant frequencies achieving
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Compact metal-printed filtering antenna with wideband performance Microw. Opt. Technol. Lett. (IF 1.5) Pub Date : 2024-02-02 Lang Xu, Li-jie Xu, Xian-min Wu, Bo Li, Feng Huang
In this letter, a wideband cavity-backed filtering antenna based on 3-D printing technology is proposed for millimeter wave applications. This antenna is made up of an air-filled metal cavity, attached with two transverse slots on its upper surface. By exciting one TE110 cavity mode and two slot modes simultaneously, wideband performance can be obtained. Besides, by properly bending one slot into U-shape