A new dual-polarized 3-D frequency-selective surface (FSS) with quasi-elliptic bandpass response is proposed by virtue of the square coaxial waveguide (SCW). By utilizing SCW as one propagation path in unit cell, two resonators can be generated intrinsically without introducing any extra structures. In addition, parallel-plate constructed sandwiching ABS frame between outer conductors adjacent SCWs will provide a second and create another resonator. With help these resonators, passband...

In this brief, a broadband high-efficiency quasi-Class-J power amplifier (PA) based on nonlinear output capacitance effect is proposed. With the influence of voltage across between drain and source ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\text{v}_{\mathrm{ DS}}$ </tex-math></inline-formula> ) at over-driven condition, negative second harmonic termination has been generated by...

Millimeter-wave (mm-wave) monolithic-microwave-integrated-circuit (MMIC) bandpass filters (BPFs) usually feature high insertion loss (IL). To this concern, an analytical method for low-loss MMIC BPFs is presented by using lumped-distributed parameters in article. reduce the IL, enhanced-quality-factor resonator and coupling topology are both investigated. First, proposed filter realized combining quasi-lumped elements distributed mutual coupling. Both compact size multiple transmission...

The 2.5-dimensional closed loop is investigated to constitute a novel miniaturized frequency-selective surface (FSS) whose electric size of one unit cell as small 0.048 λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">0</sub> × . For miniaturization, two pairs orthogonal split square rings are connected in series by four vias array the FSS cell. Thus, this exhibits polarized insensitivity for different incident angles. An equivalent circuit...

Two new types of multi-functional RF wide-band differential-mode-to-single-ended filtering power dividers are reported in this brief. Their first configurations exploit half-wavelength ring resonators and coupled-line sections to attain common-mode suppression throughout a broad spectral range. Furthermore, asymmetrical stages incorporated more-advanced schemes enlarge upper-stopband bandwidth. demonstrative microstrip prototypes for the different structures tri-functional circuit concept...

A novel miniaturized and light weight W-band bandpass filter (BPF) is proposed based on the gap waveguide (GWG) concept using micro-electromechanical system (MEMS) technique. The BPF achieved by cascading four rectangular GWG resonant cavities with designed cross-shaped coupling structure. Two standard WR-10 windows are as input/output couplings, which contributes to flexible application in various packaging configurations. By utilizing classical matrix theory, MEMS work from 89.8 97.4 GHz,...

Two novel classes of high-selectivity input-reflectionless bandpass filters (BPFs) with narrow- and wide-band characteristics out-of-band transmission zeros (TZs) are presented. These BPFs, which based on a complementary-duplexer approach, respectively, exploit intercoupled short-/open-ended dual- behavior resonators (DBRs) coupled line/T-stub two-path transversal filtering stages in their main BPF channel. Their absorptive auxiliary channel is made up resistively terminated dual-band bipath...

A bandpass push-pull high power amplifier (PA) based on substrate integrated waveguide (SIW) filtering balun divider is proposed in this article. The characteristic of the PA realized by complementary split rings resonators (CSRRs) defected SIW. Inherent to middle metal plane SIW balun, 180° phase difference division can be achieved. Due natural differential design produce second-harmonic suppression. Greater output obtained owing combiner. For fabricated PA, it exhibits high-selectivity...

The design of ultra-low-loss millimeter-wave (mm-wave) low-temperature cofired ceramic (LTCC) bandpass filters is proposed by merging the lumped and distributed circuits in this breif. By inserting a ground plane inside filter, cross talk between quasi-lumped capacitors microstrip lines can be highly reduced. Accordingly, or analyzed designed flexibly for further performance improvements. To alleviate complexity, lossy equivalent circuit model introduced verified LTCC filter. Based on...

This letter proposes an 8 × high-efficiency low-sidelobe slot antenna array operating at Ka-band frequencies with a feeding network designed by new printed ridge gap waveguide (PRGW). The device consists of element, PRGW unequal network, and stripline-to-PRGW transition. substrate integrated element fed the through coupling aperture has wide bandwidth, isolation is also increased adding metallized holes to array. Compared other arrays, our work realizes separately due use compact mushroom...

In this brief, a novel bandpass filter (BPF) with ultra-wide upper stopband performance is proposed and implemented on gallium arsenide (GaAs) integrated passive device (IPD) technology. Firstly, the BPF designed by introducing <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\boldsymbol{\pi }$ </tex-math></inline-formula> -section to achieve an stopband. Following that, working principle of achieving...

In this letter, a millimeter-wave (mm-wave) dual-band bandpass filter is proposed with large bandwidth ratio by using gallium arsenide (GaAs)-based integrated passive device (IPD) technology. To realize small chip size, one dual-mode on-chip resonator designed quasi-lumped capacitors and microstrip lines. addition, multiple transmission zeroes are generated further introducing both the electric magnetic couplings between adjacent resonators. of two passbands, external quality factors...

For monolithic microwave integrated circuit integration and antenna application, a novel W-band millimeter-wave transition from microstrip line to groove gap waveguide (GWG) is proposed in this communication. The achieved by modified planar triangular patch resonator with an inner shorting via. To give physical insight, E-field analysis presented, its working mechanism similar that of the passband filter based on coupled resonators. may contribute potential GWG application radar...

An ultra-wideband transition from microstrip line to ridge gap waveguide (GWG) is proposed for W-band system integration with antenna array and a transceiver. Substrate integrated bridge used in the electromagnet wave propagation between GWG, which can realize impedance matching wideband frequency range. Back-to-back prototypes are fabricated by low-temperature co-fired ceramic (LTCC) technique, probe measurement results show that work at W-band. Moreover, application of LTCC slot magnetic...

A novel frequency selective surface (FSS) has been designed based on 2.5‐dimensional (2.5D) closed loop for miniaturisation. Compared with the previous FSSs in literature, proposed FSS is smaller (0.048 λ 0 × 0.048 ) and shows almost same transmission coefficient different polarisations incident angles. prototype of fabricated measured. The results experiment show a consistency simulated ones.

A wideband and miniaturized forward-wave directional coupler using periodical loaded LC network is proposed in this brief. The consists of parallel plates vertical meander lines. designed with impedance matching, a large phase difference small variation between the even odd modes within wide frequency range. These propagation characteristics are calculated predicted by unit cell Bloch-Floquet theorem. Finally, prototype fabricated low-temperature co-fired ceramic (LTCC) technology. electric...

A W-band 8 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\times $ </tex-math></inline-formula> slot-enhanced antenna array with high gain and aperture efficiency is proposed based on the mixed printed circuit board (PCB) machining technique. The consists of 16 2 subarrays. substrate-integrated waveguide (SIW) cavity used to feed subarray, where electromagnetic fields distribute in TE <sub...

In this letter, a low-temperature co-fired ceramic (LTCC) substrate integrated 8 × circularly polarized (CP) antenna array is proposed for the wideband and high-gain W-band antenna-in-package application. By introducing planar L-probe together with original coupling probe, E-fields in substrate-integrated-waveguide (SIW) cavity are changed, additional E-field components 90° phase difference produced. Then, CP obtained. To reduce losses feeding network, gap waveguide technology utilized SIW...

Two dual-band branch line couplers with arbitrary power division are proposed in this brief. By adopting half-wavelength open/short-ended stubs improved couplers, the operations could effectively be implemented while ensuring a compact size. Furthermore, frequency is tunable by changing characteristic impedance of transmission line. For practical verification, two coupler (εr = 2.65, h 0.5 mm) operating at 0.9/1.8GHz and 0.9/1.57GHz constructed microstrip technology tested. The measured...

In this brief, two wideband bandpass filters using a novel double-row staggered double-sided quasi-SSPPs transmission line are proposed. By loading U-shaped cells symmetrically, zero can be introduced into the original operating frequency band, which forms high out-of-band suppression filter. The structure draw an analogy with parallel stripline, and equivalent circuit model of microstrip constructed to assist analysis design. passband selectivity further improved when number is increased...

In this letter, a filtering antenna array is designed and operates at Ka-band based on the gap waveguide (GWG) technology. The function achieved by using GWG feeding network, incorporated with ridge groove (GGW). GGW cavity cascaded vertically to excite microstrip patches. Finally, 8 × prototype fabricated measured WR-28 flange. fed transition from waveguide. Due low loss characteristic of gain more than 25 dBi –25 dB cross polarization. Its working frequency centered 35.25 GHz 4.3%...

In this article, the design and implementation of two 28-GHz millimeter-wave on-chip high selectivity bandpass filters with coupled dual-behavior resonators are proposed. The proposed consist open/shorted stubs. Two three out-of-band transmission zeros can be realized for filters. designed fabricated verification. measurement results show that insertion losses both less than 2.2 dB at center frequency. sizes 2.556 mm ×1.23 3.155 × 1.47 mm, respectively, including pad.

In this article, various types of six-port balanced rat-race couplers with wideband common-mode suppression characteristics are presented. these couplers, the input and output ports can functionalize either as single-ended or differential terminals to realize different operational modes. The power-splitting ratio for be flexibly adjusted by means values characteristic-impedance parameters their constituent transmission-line segments. Furthermore, employment...