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This work presents the design and analysis of a novel dual-wideband bandpass filter (BPF) using the transversal filtering section (TFS), coupled lines (CLs), and stepped impedance stubs (SISs). Initially, a dual-band BPF employing TFS and CLs is designed. To enhance the bandwidth and selectivity, SIS units and quarter wavelength transmission lines are attached at the input and output ports. This novel

We propose a hybrid guided structure consisting of a rectangular waveguide loaded with channel-shaped and its complementary wedge-shaped metallic pillars that supports spoof plasmonic guided modes. The complementary structure is used in order to gain better control over tuning of the asymptotic frequency in the spoof plasmonic waveguide. As a proof of concept, a tunable microwave bandpass filter based

Based on the hybrid microstrip and substrate-integrated waveguide (SIW) technologies, a compact filter with wide-stopband characteristics is presented in this letter. Two microstrip-based uniform impedance resonators (UIRs) are etched between two SIW cavities, which not only resonate to generate transmission poles, but also constitute coupling-null structures to prevent the propagation of TE 102 mode

This letter reports on a new type of miniaturized RF co-designed bandpass filter/circulator (BPFC). Miniaturization is achieved by: 1) capacitively loading a multi-mode ferrite-based disk resonator; 2) combining the function of an RF circulator and a bandpass filter (BPF) within the volume of a single microwave component; and 3) by tuning its transfer function. The proposed BPFC exhibits a quasi-elliptic

In this letter, a new technique to design wideband bandpass filters (BPFs) is proposed. It is based on the classical filter topology formed by shunt short-circuited stubs connected by transmission lines, where the $\lambda /4$ connecting lines are replaced by $\lambda /2$ lines. In this way, the connecting lines have a double functionality: to control the coupling between resonators and to add additional

A compact broadband phase shifter based on the half-mode substrate-integrated waveguide (HMSIW) is proposed in this letter. By etching interdigital capacitor or adding blind holes and patches into the HMSIW, the width of the HMSIW can be reduced. Moreover, based on the complementary phase responses of series capacitance and shunt capacitance loading on the HMSIW, a broadband phase shifter is designed

This letter presents a compact output combining network for a packaged integrated asymmetric Doherty power amplifier (DPA) by taking advantage of device drain source capacitance, Cds and package parasitic components. A new method is introduced to/of/for absorbing part of the peaking amplifier’s $C_{\mathrm{ ds}}$ into the impedance transformer, thus extending the $C$ – $L$ – $C$ -based “ $C_{\mathrm{

A high-power subterahertz (THz) push–push oscillator topology is proposed. Adopting Hartley oscillator topology with transformer as its resonator, the proposed oscillator reduces the effective parasitic capacitance of transistors; therefore, a larger size transistor can be adopted, which increases the output power while still maintaining the same oscillation frequency. The adoption of the transformer

In this letter, a 38–40 GHz high-speed IQ modulator using sub-harmonically injection-locked quadrature frequency-locked loop (FLL) is proposed. The IQ modulator consists of a quadrature FLL and four reflection-type modulators and it is implemented in a 90-nm complimentary metal–oxide–semiconductor (CMOS) process. With a sub-harmonic number of four, the proposed modulator features a locking range wider

In this letter, a compact broadband high-efficiency microwave rectifier is presented for powering implantable medical devices located deeply in the human body. By utilizing a modified real frequency technique and an RF step-up transformer at the input matching network, the proposed rectifier has a measured conversion efficiency ( $\eta $ ) exceeding 50% over a 62% fractional bandwidth from 900 to 1700

The behavior model based on the artificial neural network has been widely used in the broadband power amplifier (PA). Although the deep neural network (DNN) performs well in the PA modeling with high-dimensional inputs, the training time of the DNN model is still long. This letter proposes a PA modeling method based on transfer learning to reduce training time without sacrificing modeling performance

This letter presents an efficient dual-band rectifier using stepped impedance stub matching circuit. Theoretical analysis of the dual-band impedance matching circuit comprising a stepped impedance stub is carried out, which plays a key role in designing the resultant dual-band rectifier. The proposed dual-band matching circuit can achieve wide frequency ratio which is analyzed and predicted by simulation

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This Inaugural Special Issue of IEEE Microwave and Wireless Components Letters (MWCL) includes 51 papers from the 2021 IEEE Microwave Theory and Techniques Society (MTT-S) International Microwave Symposium (IMS), Atlanta, USA, GA, June 7–10, 2021.

This work introduces a multilayered organic package with embedded antennas that enables the integration of a scalable wideband phased array module supporting the n257, n258, and n261 5G frequency bands (24.25–29.5 GHz). The package comprises: 1) an $8\times 8$ array of dual-polarized antenna elements with 5.1-mm spacing; 2) RF, intermediate frequency (IF), dc, and digital interconnects to support radio-frequency

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A precise-integration time-domain (PITD) method with a thresholding scheme is proposed to reduce the computation cost of the matrix exponential for solving electromagnetic (EM) problems. The finiteness of EM wave speed is used to analyze the structure of the matrix exponential, revealing that the dense matrix exponential can become sparse. A thresholding scheme for eliminating tiny and thus unimportant

The design of an additively manufactured circular waveguide 3-dB hybrid directional coupler is proposed and demonstrated. Asymmetric corner radius perturbations at the in-plane orthogonal junction of the four waveguides along with curvilinear inductive posts designed to interact with the TE 11 mode of the circular waveguide are used to facilitate directivity and isolation. Capacitive waveguide perturbations

In this letter, a novel variable power divider, which provides wide-range variable power division, is proposed. The proposed power divider consists of a magic-T, variable phase shifter, and 90° delay line. The operating principle of the proposed circuit is theoretically discussed, and a 5-GHz band prototype using a planar magic-T is designed and experimentally evaluated. The measured power division

A $W$ -band metallic waveguide module capable of spatial power combining of linear microstrip array is presented. The module employs two uniquely devised split-channel blocks to obtain a uniform field distribution in an oversize merged channel and couple an equal amount of power to ten microstrip elements aligned in the direction of the waveguide $E$ -plane. The array of microstrip thru lines, each

A 60-GHz polar vector modulator with a lookup table (LUT)-based calibration for a variable gain active phase shifter is presented. It consists of an input buffer, an I/Q generator, a vector summing amplifier, and 6-bit phase/gain digital-to-analog converters (DACs). It is very difficult to obtain accurate gain and phase characteristics of a polar vector modulator due to circuit imperfections, such

Using a new kind of folded waveguide (FWG) with modified circular bends and two-stage depressed collector, we have designed a $W$ -band-pulsed traveling wave tube (TWT) operating at substantially lowered-voltage with high power and efficiency. A prototype tube has been tested at voltage of 15.66 kV and 30% duty cycle, showing output power over 180 W and gain over 36 dB in 91–97-GHz frequency range

This letter presents an innovative stacked cell, where the common source device is split in to two smaller devices leading to a more compact and symmetric structure, with almost negligible parasitics associated with the transistor connection. This novel configuration is rigorously compared, for the first time, with the two classical approaches commonly adopted to physically connect the two devices

This letter presents a wideband on-chip frequency detector implemented in a 65-nm CMOS technology. The frequency detector is composed of a fish bone like transmission line and a series of distributed power detectors with a parallel-to-serial readout circuit. A slow wave structure is employed in the transmission line for improved area efficiency. The frequency is extracted from the waveform profile

A low-noise active leakage canceller (ALC) for radio frequency identification (RFID) transceiver is reported. The proposed ALC suppresses the strong transmitter (TX) leakage at the receiver (RX) input through continuous leakage tracking by employing an I/Q harmonic rejection switched-capacitor digital power amplifier (I/Q HR SC DPA). Compared to the analog feedback loop-based ALC, the proposed ALC

We propose the body floating and self-bias technique, in which the body of the transistor is connected to its drain through a resistance (13.6 $\text{k}\Omega $ in this work). A low-power 3–9-GHz CMOS low-noise amplifier (LNA) using the technique for sub-6-GHz 5G systems is reported. An enhancement in $S_{21}$ and noise figure (NF) of the LNA is achieved due to the forward body-to-source bias ( $V_{\mathrm

A disordered-cavity-based metaimager (DCM) that can be used for coincidence imaging is proposed in this letter. The proposed DCM possesses narrow frequency gap, low correlation coefficients, and high efficiency. Due to the all-in-one design, the DCM has good robustness and is insensitive to fabrication errors, which is suitable to be fabricated using the 3-D printing technique. The DCM working from

This letter proposes a calibration method to properly measure the incident power in a directional coupler (DC) when the measurement configuration has low directivity. The proposed method is based on measurements of short-circuits placed at different distances to calibrate the DC response. Results show that the method is clearly robust and provides accurate measurements even for directivities as low

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This letter reports proof-of-principle demonstration of 3-D printable, low-cost, and compact terahertz (THz) spectral splitters based on diffractive optical elements (DOEs) designed to disperse incident collimated broadband THz radiation (0.5–0.7 THz) at a prespecified distance. Via inverse design, we show that it is possible to design a diffractive optic that can split broadband incident spectrum

This letter presents a compact, wideband, planar, E-arm folded magic tee at $Ku$ -band for monopulse slotted waveguide antenna array applications. A novel impedance matching structure, an L-shaped septum, is implemented at the magic tee junction, which results in wide impedance bandwidth at all ports. The height of this septum is the same as that of the waveguide height, which allows the design to

An analysis of the second-order mixed-coupled bandpass filter (BPF) of a general form is carried out. The resonators in this BPF are presented by a resonant frequency $f_{0}$ and a susceptance slope parameter $b$ . The position of the transmission zero (TZ) generated by the mixed coupling is determined. A correspondence is established between the mixed coupling representation as the sum of magnetic

In this work, a serpentine microrectangular coaxial delay line (MRCDL) operating from dc to Ka -band is realized based on MEMS-Casting (MEMS-C) process. As an emerging technology, the MEMS-C process provides a low-cost, rapid, and one-time prototyping approach for manufacturing the proposed MRCDL. Besides, the single-crystal quartz with low permittivity and low loss tangent is used to fill the MRCDL

This letter presents a novel class of compact dual-mode bandpass filters based on half-mode substrate-integrated waveguide (HMSIW) cavities. By using both TE 102 and TE 301 modes of the HMSIW rectangular cavity as resonant modes and TE 101 mode as nonresonating mode, a novel HMSIW doublet with two poles and two transmission zeros (TZs) is implemented. The TZs can be located at one side or both sides

This letter proposes a wideband filtering differential phase shifter with enhanced harmonic suppression. Through the original transmission line model, the numerical relationship between the prescribed amplitude/phase response and the initial design parameters can be readily established. Then the simple transformation from the transmission line to its T-type lowpass network is utilized to suppress the

A novel dual-mode (DM) dielectric waveguide (DW) filter with controllable transmission zeros (TZs) is presented. The DM filter is based on a cascaded implementation, utilizing individual DM DW cavities. The filter is practically realized by embedding three circular blind holes at different positions in the surface of a dielectric silver-coated square cavity. By changing the relative position of the

A compact multifunctional switchable filter based on parallel-coupled lines with three different filtering functions is presented in this letter. By using p-i-n switches to connect or disconnect microstrip line and shorted coupled lines, three different modes, i.e., wideband bandpass filter (BPF), bandstop filter (BSF), and dual-band BPF, can be realized. For demonstration, the switchable filter prototype

We propose a second-order $RC$ -only voltage-mode active all-pass filter (APF) as an analog time-delay cell. The core circuit of the proposed APF is canonical and consists of only one transistor, one resistor, and two capacitors. Therefore, this design is area efficient, and it is suitable for low-gigahertz frequency applications, where conventional $LC$ designs are not practical, due to large inductor

An improved millimeter-wave nonlinear model for InP heterojunction bipolar transistor (HBT) is proposed in this letter. The frequency dispersion effect has been taken into account in the Agilent HBT model in Agilent ADS software. Model verification is carried out by comparison of measured and simulated dc and S-parameters up to 110 GHz.

This letter presents the design approach for a compact, single-stage, wideband MMIC power amplifier. A method is proposed to compensate for the output capacitance of the active device over a frequency range as wide as possible, with minimum impact on the achievable output power, which leads to a two-element compensating network. A three-section transformer is then adopted for a real-to-real transformation

This letter proposes a low-phase-noise high-efficiency power oscillator with digitally controlled output power and frequency. The transformer-based matching network resonator is implemented to balance the quality factor and matching efficiency. The active core and the transformer are jointly optimized to achieve the required output power while achieving the low phase noise and high power efficiency

A standard substrate integrated waveguide (SIW)-based bandpass filter (BPF) suffers from bulkiness that limits its application in the implementation of compact size low phase noise oscillator. Instead, in this letter, an eighth mode SIW (EMSIW) resonator-based BPF is utilized to realize a miniaturized low phase noise oscillator for $X$ -band applications. Additionally, an equivalent circuit model of

A tunable resonant multiband transmit/receive (T/R) switch is proposed and fabricated in 45-nm silicon on insulator (SOI) CMOS to cover the frequency band from 24 to 47 GHz allocated for 5G mobile communication systems. For the Tx path, the measured insertion loss is 0.85 and 0.8 dB at 28 and 39 GHz, respectively. The OP1dB is 22 and 28.5 dBm at 28 and 39 GHz, respectively. The OIP3 is 40 and 41 dBm

A wideband and highly efficient power amplifier (PA) is designed using a simple and systematic approach. This method employs an optimization process to set the input impedance of the matching networks in optimal regions on the Smith chart, obtained using conventional load-pull/source-pull simulations, in both the fundamental and second harmonics. The developed design method led to a GaN PA whose measurements

This letter presents the design and characterization of a Doherty power amplifier for K-band applications based on the GaAs 150-nm pseudomorphic HEMT (pHEMT) technology of Qorvo. For the output power combiner, a wideband design approach, based on embedding the output capacitance of the active devices in the combiner, is applied. A state-of-the-art bandwidth of 4 GHz is achieved: in the 21–25-GHz range

This study presents a compact rectifier array with an adaptive power distribution network (APDN). The rectifier array comprises rectifier cell 1 for both high-power mode and high-frequency band; rectifier cell 2 for both low-power mode and low-frequency band; and a power distribution network, which adaptively distributes power according to the input power and frequency. The proposed APDN is merged

Wearable and elastic surface coil using a conductive and stretchable textile for magnetic resonance imaging (MRI) of breast was designed. A high-conductive silver thread was woven with elastofiber to create two elastic textile coils. Three phantoms with varying sizes and a resolution plate were also designed to validate the coil performance. Signal-to-noise ratios (SNRs) were calculated for the phantoms

A microwave rectifier composed of a pair of Schottky diodes with dynamic capacitive self-compensation is proposed in this letter. The impedance of a Schottky diode usually varies with the input power. A method using paired diodes for capacitive self-compensation is presented to enhance the rectifier’s dynamic power range. The imaginary part of one diode’s impedance is compensated using another identical