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In this letter, a compact dual-band dual-mode substrate integrated waveguide (SIW) balanced band-pass filter (BPF) with intrinsic common-mode (CM) suppression is designed by using a single perturbed SIW circular cavity. The vias and slot perturbations are introduced to tune the resonant modes TE 010 , TE 110 (a pair of degenerate modes), and TE 210 of a circular cavity. Thus, they can be used to form

A methodology for tunable bandpass filters (tBPFs) with one switchable transmission zero (TZ) is presented, wherein the frequency tuning and TZ switching can be simultaneously achieved by merely tuning the resonant frequencies of resonators. Theoretically interpreted by coupling matrices with arbitrary filtering orders ( $n \ge 2$ ), the TZ can be symmetrically switched between lower and upper sides

In this letter, a new compact filtering power divider (FPD) on the square substrate integrated waveguide (SIW) with wideband isolation is proposed. As the isolation network is embedded in a square SIW cavity, good in-band isolation, compact structure, and low insertion loss can be simultaneously attained. The proposed FPD consists of the coplanar waveguide feeding line of Port 1, the capacitor, a resistor

A two-section broadband coupler with wide-range phase differences and power-dividing ratios is proposed. Closed-form design equations for the proposed couplers are derived. For verification, two couplers I and II operating at 2 GHz with phase difference of 45° and power-dividing ratio of 1, and phase difference of 60° and power-dividing ratio of 2, respectively, are fabricated and measured. For the

We propose a new tunable coupler with flexible coupling direction and a wide power division ratio (PDR) tuning range. The structure consists of two 90° hybrid couplers with two reconfigurable synthesized transmission lines (RSTLs) inserted in between. The RSTL is designed to operate either in the passband as an analog phase shifter or in the transition region and stopband as a mismatched circuit with

This letter presents a $4 \times 4$ Butler matrix realized using stereolithography 3-D printing technology and liquid metal filling. The matrix is in coaxial technology and relies on circular branch lines and curved $50~\Omega $ lines. Input and output ports are aligned and placed on the same plane, while branch lines are organized using all three dimensions to minimize the length of the connecting

A compact double-sided contactless electromagnetic bandgap (DCEBG) structure is introduced in this letter. It consists of three metal plates placed in parallel, including two smooth metal plates and a corrugated metal plate in the middle. The middle plate is double-sided corrugated alternatively with a displacement of half period. The depth of the corrugations is about quarter wavelength of center

A wideband terahertz (THz) output network consisting of a pyramidal horn and a diamond Brewster window has been developed for 0.7–1.0-THz traveling-wave tube (TWT) amplifier and is measured at 0.325–0.5 THz owing to the limitation of the measurement facility. A pyramidal horn is designed to convert the waveguide mode into a high-purity quasi-plane polarized mode to meet the demand of the Brewster window

This letter proposed a combined susceptibility diagram, applicable to investigating and differentiating the inherent mechanism of multipactor in dielectric-loaded microwave devices. This susceptibility diagram consists of average secondary emission yield on the dielectric surface and both the surfaces. Using this diagram, we predict the electron multiplication mechanism in the partially dielectric-loaded

The power amplifier (PA) behavior models based on deep neural networks (DNNs) have been widely used. However, it is challenging to balance the network depth, the number of neurons, and the combination of input terms. Accordingly, how to obtain a suitable DNN model becomes a problem. This letter proposes a method to acquire the corresponding optimal DNN structure balancing multiple aspects for a PA

This letter presents a simple method to design dual-band high-efficiency power amplifiers (PAs). The dual-band coupler is exploited to design the output circuits of the PA. By proper selection of impedance conditions of terminal ports, the dual-band coupler can convert the fundamental impedance of transistor to the standard 50- $\Omega $ load at two frequencies. At the same time, the second harmonic

A Ka -band monolithic low-noise amplifier (LNA) with high gain and high dynamic range (DR) has been designed and implemented in a 100-nm gallium nitride (GaN)-on-Si technology. The LNA is designed as the first stage of a high DR receiver in an frequency modulated continuous wave (FMCW) radar for the detection of small drones. The three-stage monolithic microwave integrated circuit (MMIC) LNA has a

A broadband process, voltage, and temperature (PVT)-insensitive noise-canceling balun-low-noise amplifier (LNA) was implemented in the 0.13- $\mu \text{m}$ CMOS process for subgigahertz wireless communication applications. The proposed LNA is based on the traditional common-gate common-source (CGCS) balun-LNA topology, and it adopts the diode-connected loads to reduce the noise contribution originated

A variable gain distributed amplifier (VGDA) for the Rx path of ultrawideband phased-array system is implemented in 90-nm CMOS process and presented in this letter. In order to achieve high gain and wideband with relative low dc power dissipation ( $P_{\mathrm {dc}}$ ), the combination of the conventional distributed amplifier (CDA) and the cascaded single-stage distributed amplifier (CSSDA) is utilized

In this letter, the authors present the first millimeter-wave (mm-wave) high-order backscatter modulator, based on a BiCMOS technology for 5G/Internet of Things (IoT) applications. The design and implementation of the proposed system are described, followed by the considered characterization measurement setup. This work presents a chip that performs different orders of backscatter modulation, M-quadratic-amplitude

A novel low phase noise concurrent dual-band complementary metal–oxide–semiconductor (CMOS) voltage-controlled oscillator (VCO) employing a gate-feedback enabled, nonuniform multiwinding transformer is proposed. The transformer consists of the wide-width looped main inductors and surrounding narrow-width looped feedback inductors, featuring a high degree of design freedom, owing to its controllable

A novel integrated rectifier–transmitter (IRT) that targets to reduce the power consumption of the uplink communication of a wireless sensor is presented in this letter. The proposed IRT fully utilizes the second harmonic generated by the rectifier as the uplink carrier and modulates this carrier in amplitude through a reconfigurable bandstop filter (BSF) that is dynamically biased by the uplink baseband

The application of serial connection of step recovery diodes (SRDs) in picosecond pulse generators was investigated in the letter. Parameters of 80 SRDs were measured, and their standard deviation was estimated. It was shown that the deviation of the SRD parameters significantly reduces the efficiency of their serial connection in picosecond pulse generators. It is proposed to select diodes whose dependencies

Passive intermodulation (PIM) is generally regarded as an unavoidable interference in radio frequency (RF) circuit and system, which exhibits dynamic characteristics with the change of signal frequencies and powers. In this letter, a prediction model of frequency and power dependence of PIM is theoretically proposed and experimentally verified. Physical nonlinearities of truncated distortion and tunneling

The real-time capability becomes more and more important for the millimeter-wave imaging systems in variety of applications. To achieve this purpose, the imaging scheme with multiple-input–multiple-output (MIMO) is one of the potential ways, while still limited by the high computational complexity of the conventional MIMO image reconstruction algorithm, which is commonly based on the back-projection

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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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Vector fitting (VF) is a robust macromodeling method to construct rational models of a network based on tabulated frequency responses. When fitting a network with a large number of ports, the matrix equation in VF quickly grows into a formidable size. The conventional strategy is to break the equation into several small QR factorizations and then combine the results into a least-squares (LS) problem

In this letter, a new wideband dielectric-loaded TM 01 –TE 11 mode converter is proposed. It is shown that a new hexagon metallic sheet (HMS) placed in the middle of a circular waveguide has a lower reflection of the TM 01 mode compared to a rectangular metallic sheet. Using such HMS in the structure of dielectric-loaded TM 01 –TE 11 mode converters can enhance the operational bandwidth significantly

This letter presents a novel approach for packaging millimeter-wave (mmW) and terahertz (THz) circuits. The proposed technique relies on using an on-chip coupling structure that couples the signal to a quarter-wavelength cavity, which in turn couples to either a waveguide (WG) or another chip. The solution also uses a periodic electromagnetic bandgap (EBG) structure that controls the electromagnetic

This letter presents a novel, simpler, and more accurate synthesis method for inline extracted-pole low-pass prototype filters. At the present, this topology is only synthesized by using section extraction or optimization methods, known to suffer from accuracy problems, especially for high-order filters. The method described in this letter relies on the robustness and accuracy of the coupling-matrix

Extracted pole filters alternating transmission zeros (TZs) above and below the passband are intrinsically related to the use of nonresonant nodes (NRNs) of different nature (inductive and capacitive). This work demonstrates that it is possible to synthesize an extracted pole filter showing TZs on both sides of the passband but implementing all NRNs of the same reactive nature, overcoming the limitations

This letter proposes a compact low-pass filter (LPF) using dielectric filled capacitor based on the substrate integrated suspended line (SISL) platform. A dielectric filled capacitor with high capacitance density is presented for the first time. Using this type of capacitor, a three-order lumped element LPF with a cutoff frequency of 120 MHz is designed, fabricated, and tested. The measured results

This letter presents a common-mode noise absorption (CMNA) circuit using the double-sided parallel-strip line (DSPSL). The circuit behaves as a pair of conventional transmission lines (TLs) under differential-mode (DM) excitation. The common-mode (CM) noise is suppressed and absorbed by the surface-mounted resistors between the two TLs. Based on analytical design equations, the values of the surface-mounted

Digital predistortion (DPD) based on Volterra models is commonly employed to counteract the nonlinear distortion of power amplifiers. However, when concurrent dual-band signals are transmitted, 2-D DPD models are required. In this work, upgrading of a standard dual-band model is proposed and justified using multinomial theorem. The linearization performance of the current proposal has been compared

A small-signal equivalent circuit for graphene field-effect transistors (GFETs) is proposed considering the explicit contribution of effects at the metal–graphene interfaces by means of contact resistances. A methodology to separate the contact resistances from intrinsic parameters, obtained by a deembedding process, and extrinsic parameters of the circuit is considered. The experimental high-frequency

This letter proposes a mesh-selecting (MeS) method for complex-valued signals oriented at significantly reducing the training data required to extract the parameters of mathematical models for characterizing the nonlinear behavior of power amplifiers or digital predistortion linearizers. Experimental results will show the advantages of the proposed MeS method when properly combined with dimensionality

In this letter, a wideband watt-level digital power amplifier (DPA) with a balance-compensated matching network is proposed for polar transmitters. The balance response of the differential to the single-ended transformer is enhanced by a series-loaded compensation capacitor, which leads to the improvement of the DPA efficiency. To verify the mechanisms, a prototype DPA is fabricated in conventional

In this letter, at the first step, design of a new broadband planar 9:1 transmission line impedance transformer is investigated and several parameters of this transformer, such as characteristic impedances of the lines, their length, and ground plane distance effects, are analyzed from a new point of view. Then, a multioctave power amplifier (PA) is implemented using the introduced transformer as input

A high-power dual-wideband GaN power amplifier (PA), which features a filter-based input diplexer and a transformer-combined load, has been proposed in this study. The diplexer realized by low-/high-pass filters presents a high dual-band isolation (>15 dB) and can arbitrarily select the location of the two widely spaced bands. Instead of using a diplexer in the output matching network (OMN), a transformer-combined

This letter presents a linear wideband differential optical driver amplifier in a 90-nm silicon germanium (SiGe) bipolar-complementary-metal-oxide-semiconductor (BiCMOS) process. The amplifier utilizes a modified triple-stacked heterojunction bipolar transistor (HBT) topology with emitter degeneration to achieve high output voltage swing and high linearity. The amplifier achieves 13.2-dB voltage gain

This letter presents a fully integrated three-stage single-ended $D$ -band power amplifier (PA) designed in 0.13- $\mu \text{m}$ silicon–germanium (SiGe) BiCMOS technology. Several bandwidth extension techniques and matching networks are mutually exploited to maximize Bandwidth (BW) performance while assuring unconditional stability. Its measured 3-dB bandwidth covers the entire $D$ -band (110–170

This letter presents a fully integrated Ku -band low-noise amplifier (LNA) with a large-size transistor using 65-nm bulk complementary metal–oxide–semiconductor (CMOS) technology. To achieve an ultralow-noise figure, an optimization methodology balancing the ON-chip gate inductor and the parasitic capacitance of the large-size device is introduced. Using a voltage supply of 1 V, the proposed LNA has

This letter presents a 28–40-GHz 5-bit digital step attenuator (DSA) in a 0.13- $\mu \text{m}$ SiGe BiCMOS technology. The DSA achieves low amplitude and phase variations by using the following techniques: 1) combination of distributed, T-type, and modified $\Pi $ -type attenuators can ensure a low amplitude variation while maintaining a compact size; 2) interstage matching is designed to relax the

A 12-bit 0.5–2.4-GHz parasitic-insensitive digital-to-phase converter (DPC) with high linearity is presented in this letter. A modified parasitic-insensitive charge-based (PICB) phase interpolator (PI) is proposed to avoid linearity degradation caused by parasitic effect. A novel PI cell with separated clock selecting logic is implemented to solve charge leakage and overcharging problem. The DPC is

The design of an adjustable loop bandwidth (LBW) frequency synthesizer with an on-chip loop filter (LF) array is presented. The LF array based on the simple capacitor multiplier topology is proposed to support LBW switching between 500 kHz and 1 MHz while saving 82.9% chip size compared to the traditional LF array. The maximum capacitance of 108 pF is realized by using the capacitor multiplier with

To achieve a high-efficiency microwave wireless power transfer system, a high conversion efficiency rectifier is necessary. Brown (1974) designed rectifiers with approximately 3-W input power achieved 90% conversion efficiency for 2.45 GHz, and it maintains the record for maximum conversion efficiency. In this study, to design a high-efficiency and high-power rectifier, we designed a larger semiconductor

Electromagnetic coupling between planar devices can degrade microwave calibrations and, consequently, the accuracy of a measurement. This letter describes measurement-based methods that can identify, assess, and visualize the electric field coupled between the adjacent planar calibration structures. The coupling within a printed circuit board (PCB)-based and an on-wafer impedance standard substrate

Ultrahigh frequency radio frequency identification (UHF RFID) uses backscattered electromagnetic (EM) modulation techniques to communicate between readers and tags. The suppression of the carrier signal leaked from the transmission channel to the receiving channel is the key factor that determines the reader’s sensitivity. In this letter, a broadband, fast carrier cancellation technique is proposed

This letter proposes a group digital predistorter with step uniformization (SU-GDPD) for massive multi-input multi-output (MIMO) transmitters with hybrid beamforming architecture. Analog predistorters (APDs) are employed to iteratively adjust the nonlinear character of the power amplifiers (PAs) that are sharing one radio frequency (RF) chain. The shared digital predistortion (DPD) parameter and the

A $C$ -band frequency-modulated continuous wave (FMCW) transmitter based on synthetic bandwidth technique for synthetic aperture radar (SAR) imaging is presented. A 500-MHz narrowband chirp signal is up-converted to two adjacent carriers to obtain 1-GHz chirp at the $C$ -band. The adjacent carriers are obtained through fast switching subharmonic injection locking oscillator (SHILO) technique with 14-ns

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This work presents insights on the application of the Bayesian information criterion (BIC) to fix the optimum number of coefficients in the Volterra series applied to the modeling and linearization of power amplifiers (PAs). The BIC is transformed from a rule to be applied after selection techniques to a stopping criterion, which enables the halting of the algorithm when a condition is reached. This

In this letter, a cross-coupled dual-bandpass filter (BPF) with separate electric and magnetic coupling paths (SEMCPs) for 5G sub-6 GHz applications is proposed. Source-to-load couplings are also introduced in this structure for the flexibility of heterogeneous feed lines. Five controllable transmission zeros (TZs) in total are produced in the dual-band filter. The filter achieves good overall performance

This letter presents an accurate model for the stubs used as frequency-dependent coupling elements in substrate integrated waveguide (SIW) filters, with the aim to generate transmission zeros (TZs) in the frequency response. The model is based on the actual modes excited in the stub, differently from the single-mode (equivalent circuit) representation used in previous works. A procedure to determine

In this letter, new compact third-order single- and dual-band filters on a hexa-modes half-mode substrate integrated waveguide (HMSIW) resonator with loaded H-shaped slot are presented. For the single-band design, the TE 101 mode, TE 201 mode, and the lower part of H-shaped slot mode are utilized to realize the third-order filtering response. By properly allocating the high-order modes, wide-stopband

This letter presents a new filter to suppress radio frequency interference (RFI) in microwave remote sensing instruments, particularly a wideband autocorrelation radiometer (WiBAR). RFI increases the noise floor and results in a decreased signal-to-noise ratio (SNR) of the WiBAR delay peak. The proposed filter operates like a Fabry–Perot interferometer (FPI) in optics and has the frequency response