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A vertically folded slotted circular patch operating at the Ka -band is proposed in this communication. Fed by a low-profile microstrip feeding structure, the proposed circular patch resonates at its quasi-TM 21 mode and exhibits a wide operational band of 23.5%, which is more superior than many reported millimeter-wave circular patch antennas. A full-corporate fed $2 \times 2$ linearly polarized (LP)

Prospective authors are requested to submit new, unpublished manuscripts for inclusion in the upcoming event described in this call for papers.

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The IEEE Transactions on Antennas and Propagation is one of the most influential publications of IEEE. Its scientific contributions attract a lot of interest and are among the most downloaded across all IEEE publications. In 2019, the IEEE Transactions on Antennas and Propagation ranked 3rd out of 376 IEEE publications for total number of downloads.

In this article, three compact antennas using the ridge gap waveguide (RGW) technology working in the millimeter-wave band (60 GHz), with a high-purity and broadband circular polarization (CP), are numerically and experimentally analyzed. The structure is fed from the bottom by means of a standard WR-15 waveguide (V-band) to make it compatible with standard measurement systems. It is coupled with a

This article presents a polarization-reconfigurable wideband high-gain antenna based on liquid metal tuning. The antenna consists of a center-feed circular patch antenna with a C-shaped slot as the driven element. To broaden the bandwidth and improve the realized gain, a parasitic circular disc and 13 circular directors are employed. The direction of polarization can be tuned by changing the location

The orbital angular momentum (OAM) in radio frequency is expected to provide a new dimension to the OAM mode and benefit the degree of freedom of the electromagnetic wave. However, a central energy hollow exists in the OAM-carrying beam, and its radius varies with the OAM mode values, which is the main bottleneck in the radio frequency OAM applications. This article proposes a solution to eliminate

We present a linearly polarized ultrawideband design for millimeter-wave phased array antennas over 17–42 GHz. The design comprises tightly coupled dipoles, integrated with a specific feeding mechanism. The proposed antenna provides a relative bandwidth of 2.7:1 and 2.47:1 with VSWR < 2 for scanning up to 45° in the E- and H-planes, respectively. Several prototypes of $8\times 4$ arrays are fabricated

This article presents the validation of a digital signal processing technique that can be used to estimate radiometric sky noise, and hence atmospheric absorption, within existing digital receivers at little/no additional cost. To demonstrate this, a receiver was constructed that simultaneously records the beacon signal power from the ALPHASAT Aldo Paraboni technology demonstration payload, as well

In this article, a novel beamforming patch array with a cosecant fourth power pattern is proposed for millimeter-wave synthetic aperture radar (SAR) applications. It enables radar receiving identical power in the field of view, provided that the radar cross section levels of targets within the illuminated area are similar. Different from “one-way” communication application, the SAR is a “two-way” system

We propose a method to design compact circularly polarized (CP) antenna using a novel sunshine-shaped slotted radiating patch, which exhibits slow wave and other interesting properties. The structured radiating patch introduces adjustable coupling between a pair of orthogonal modes (TM 10 mode and TM 01 mode) to facilitate good axial ratio (AR) and reflection parameters of the antenna simultaneously

Multielement antennas have become a central part of most communication systems, and yet their design and evaluation remain a challenge. A key parameter is the correlation matrix, which relates the antenna patterns and the multipath propagation. The correlation governs communication metrics such as the various capacities, error rates, and outages. Calculation of the correlation matrix requires accurate

A novel efficient coherent direction-of-arrival (DOA) estimation method is devised in this article. First, a new cost function without the knowledge of source number is developed exploiting the Toeplitz matrices’ joint diagonalization structure. Then, the revised steering vectors are used in the place of projection weights of the steering vectors to reconstruct the power spectrum in both noise and

The rapid evolution in brain implantable medical devices (BIMDs) promises a new paradigm of medical diagnosis, monitoring, and therapeutics. The MedRadio frequency band (401–406 MHz) offers an acceptable penetration of electromagnetic (EM) fields in biological tissues and thus is well suited for wireless medical telemetry (WMT). Unlike other parts of the body, head tissues exhibit a high level of EM

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A novel reconfigurable antenna covering an 11.5:1 bandwidth is designed and fabricated for cognitive radio applications. The proposed novel antenna has two independent paths to cover 430 MHz to 5 GHz frequency range. The first path is directly connected to an ultrawideband antenna, which covers 1–5 GHz operation frequency range. The second path, for the frequency range between 430 MHz and 1 GHz, goes

In this article, we study the interactions of electromagnetic waves with a non-dispersive dynamic medium that is temporally dependent. Electromagnetic fields under material time-modulation conserve their momentum but not their energy. We assume a time-variation of permittivity, permeability, and conductivity, and derive the appropriate time-domain solutions based on the causality state at a past observation

A novel design concept to widen axial-ratio (AR)-bandwidth of a single circularly polarized (CP) patch antenna is presented by resonating its TM $_{1/2,0}$ , TM $_{1/2,1}$ , and TM $_{3/2,0}$ modes. First, a set of shorting pins is loaded around the edge of the patch with decreased width, aiming to suppress undesired nonbroadside modes. Second, the far-zone radiated fields of the antenna are theoretically

In this article, we propose nonperiodic metasurfaces used for retroreflection of oblique incident wave with linear polarization (TE/TM) and circular polarization (CP). For CP wave, both handedness reversal and handedness preservation cases are demonstrated. The proposed metasurfaces consist of nonperiodic group cells optimized by genetic algorithm for desired scattered power patterns. Each group cell

A low-profile and high-gain Gaussian beam antenna (GBA) operating at 1 THz is demonstrated for the first time. Imprint and dry etching technologies in silicon are employed. A complementary antenna feed based on the magnetoelectric dipole is proposed for enhancing the radiation characteristics of the antenna. The microfabrication technologies are compatible with the Si-based integrated circuit manufacturing

The coaxial probe technique is used to acquire the dielectric properties of biological tissues in the microwave frequency range. To dielectrically characterize heterogeneous samples, the sensing radius of the probe must be known. Thus, in this article, for the first time, both experimental and numerical investigations were conducted to analyze and model the sensing radius dependence on the probe dimensions

The calculation of mutual coupling usually demands intense computations, especially for large aperture antennas placed in the near-field region of each other. In this article, the validity of an integral coupling formula is evaluated to demonstrate its utilizations where an efficient method for computing mutual coupling is most required. The integral coupling formula is used to compute the mutual coupling

In this article, a miniaturized dual-resonant antenna system at MHz-band operating at around 20 and 50 MHz is proposed for frequency-shift keying impulse radio (FSK-IR) intrabody communications. This antenna system comprises a swallowable helix-coil in-body antenna with a hollow cylindrical shape of 10 mm diameter and 30 mm length, and two single band on-body matched planar spiral-coil antennas with

An endfire antenna with sum and difference beams is designed based on phase transforming of a proposed asymmetric spoof surface plasmon polariton (SSPP) structure. The asymmetric arrays of grooves, with different groove depths, periods, and/or duty ratios, serve as transmission structure and transmit electromagnetic (EM) waves in SSPP modes. Due to the distinct phase constants for the EM fields on

A circular-polarized metal-only reflectarray operating at 20 GHz is reported in this article. The reflectarray uses a novel multi-slot element that supports both left-hand and right-hand circular polarization for applications such as satellite communication. The element maintains a full phase coverage of 360° for both polarizations over a wide bandwidth spanning from 18 to 24 GHz (30%). Moreover, the

We derive a new asymptotic procedure for the analysis of scalar wave diffraction by semi-infinite circular cones and apply it to derive a new closed-form expression for the tip-diffracted field in the wide-angle limit. The wide-angle cone is important, for example, for terrain or urban propagation. The phenomenological complexity of the wide-angle cone case, compared with the narrow-angle cone that

Synthesis of unequally spaced arrays with uniform excitation is considered in this article. An iterative method based on second-order cone programming is developed to search the geometry with local optimum peak sidelobe level (PSLL), which is valid for arrays of different scale regardless of geometry constraints like centrosymmetry and minimum separation. By statistical analysis and comparison with

The issue of asset tracking in dense environments where the performance of the global positioning system (GPS) becomes unavailable or unreliable is addressed. The proposed solution uses a low-profile array of antenna elements (sensors) mounted on a finite conducting ground. A compact-size sensor array of six electrically small dual-band omnidirectional spiral antenna elements was designed as a front

Here, we propose a dual linear polarized slot array antenna with monopulse corporate-feed waveguides for rectangular-coordinate orbital multiplexing transmission systems in the near-field region. In this article, we design and fabricate an eight-multiplexing $16\times16$ slot array antenna with uniform excitation in the 60 GHz band. We designed corporate-feed waveguides, the $2 \times 2$ slot subarray

A reduced-basis approximation to solve for the electromagnetic scattering from nonpenetrable targets in a frequency band of interest is studied in detail. Perfect electric scatterers in homogeneous media are considered. Even though the frequency behavior can be complicated, the electromagnetic scattering does not arbitrarily change in the frequency band of interest. Thus, instead of using computationally

This communication presents an effective approach to design the dual-band dual-mode (DBDM) patch antenna with flexible frequency ratio, wide achievable range, and compact configuration. Initially, the TM 00 and TM 10 modes of such an antenna are theoretically studied based on the transmission-line model. It is revealed that the lower resonant frequency of the TM 00 mode could be effectively reallocated

Modern communication systems will require antennas with adaptive functionality that are able to modify their performance based on the requirements of the channel. For example, mobile ad hoc networks need directive antennas that are able to radiate in any direction across the 360° azimuth plane. Conformal antennas that can be simply operated to have multifunctional performance characteristics are therefore

A dual-polarization frequency-selective rasorber (FSR) with two absorptive bands at both sides of a passband is presented. Based on the characteristic mode analysis, a circuit analog absorber is designed using a lossy frequency-selective surface (FSS) that consists of miniaturized meander lines and lumped resistors. The positions and values of resistors are determined according to the analysis of modal

To fully exploit hardware resources and maximize the throughput of the heterogeneous systems, a graphics processing unit (GPU)+CPU collaborative computing method for the finite-difference time-domain (FDTD) method scattering simulation is proposed in this article. For the workload imbalance caused by different computational performances and device-module affinity of different processors in the heterogeneous

Presents the table of contents for this issue of the publication.

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In this paper, a novel, compact, high-gain, directive, and superstrate configuration-based metasurface (MS) antenna has been designed, which incorporates a fractal-shaped slotted patch having a periodic arrangement of square patches along with a shorting via at its center and a couple of rectangular slots in the ground plane. The MS is designed over the FR4 dielectric by introducing a periodic arrangement

A design approach to miniaturized, dual-resonant microstrip circular sector patch antenna with tilted circularly polarized (CP) beam is proposed. As mathematically laid down at first, the range of an asymmetric multiresonant prototype dipole’s length should be set as the positive odd-integer multiples of one-quarter wavelength, such that the resonant frequency could be accordingly reduced by one-half

A new type of tag antenna, which is made by placing four identical planar inverted-L antennas (PILAs) in rotational symmetry constellation, is proposed for designing a miniature on-metal tag antenna. It shows good omnidirectional characteristics in the azimuth plane. In the design, the directive radiation beams of the respective PILAs are tactfully combined to form a stable omnidirectional pattern

This article presents a dual-polarized millimeter-wave endfire antenna array for mobile devices. The antenna array is integrated into a metal-framed mobile phone and radiates through a $20\times 3.5$ mm 2 window in the metal frame. The measurement results show a realized gain above 6 dBi for the frequency band of 28–33 GHz for a three-element array. Beam-steering up to ±40 is possible. The array is

We present an automated design procedure for the rapid realization of wideband millimeter-wave lens antennas. The design method is based upon the creation of a library of matched unit cells that comprise wideband impedance matching sections on either side of a phase-delaying core section. The phase accumulation and impedance match of each unit-cell is characterized over frequency and incident angle

Substrate integrated waveguide (SIW) cavity-backed slot and patch antennas with conical radiation patterns are investigated. In a center-fed SIW circular cavity with the top wall removed, a series of cavity modes with conical radiation patterns can be excited, wherein the lowest two modes are the TM 01 and TM 02 modes. The cavity-backed slot antenna with either of the two modes can work independently

A unified Brewster effect condition is proposed as a guideline for the design of the reflectionless lens. Previously, most of the investigations on the Brewster effect are limited for the homogeneous isotropic medium and the condition is sensitive to the polarization states. Here, it is predicted both theoretically and numerically that an arbitrarily polarized electromagnetic wave can perfectly refract

A dual-module machine learning scheme is proposed to reconstruct inhomogeneous scatterers with high contrasts and large electrical dimensions. The first nonlinear mapping module (NMM) is an extreme learning machine (ELM), which is used to convert the measured scattered fields at the receiver arrays into the preliminary images of the scatterers. The second image-enhancing module (IEM) is a convolutional

A novel hybrid reflection method is proposed to realize wideband gain enhancement and radar cross section (RCS) reduction properties for Fabry–Perot (FP) antennas. This method adopts two kinds of frequency-selective surface (FSS) units, which are etched on both sides of a single-layer substrate with chessboard arrangement to operate separately as a hybrid surface (HS) and a reflective surface (RS)

A novel dual-port textile antenna with a low profile and enhanced bandwidth is proposed for 2.45 GHz IMS-band full-duplex wearable applications. The antenna is developed on a textile material by using an advanced screen-printing technology and, thus, exhibits a very good structural flexibility and a high manufacturing accuracy. To improve the bandwidths at the two input ports, an innovative method

A systematic design of dual-band, orthogonally-polarized linear-to-circular polarization (LP-to-CP) converters is proposed. This class of polarization converters can transform linearly polarized waves into right- and left-hand circularly polarized (RHCP and LHCP) waves in two separate non-adjacent frequency bands. The reported polarizer is made of three cascaded bianisotropic sheet admittances, spaced

In contrast to traditional multilayer transmitarray designs, a novel dual-layer transmitarray antenna, consisting of two metallic layers printed on opposite sides of a single dielectric substrate, is proposed to achieve high transmission efficiency. First, it is theoretically derived that a dual-layer element, using the circular polarization conversion approach, can achieve a high transmission magnitude