A novel filtering method based on the metasurface antenna (MSA) with radiation nulls is proposed without loading extra circuits. Due to specific multiunit structure of MSA, first realized each radiating (MS) unit by introducing a multifolded U-shaped slot and defected ground generate lower edge nulls. Meanwhile, coplanar parasitic patches are loaded around MS units provide upper simultaneously introduce in-band resonances for wide passband. Thus, low-profile, wideband, high-gain readily...

A simple, compact filtering patch antenna with wide out-of-band suppression is presented, where the mechanism first analyzed and implemented based on mode analysis of a conventional antenna. According to analysis, undesired higher-order modes can be effectively suppressed by selecting proper length ratio two sides feeding position, thus realizing upper stopband. To further enhance response, another simple structures loaded are also proposed. First, split-ring-shaped slot etched generate...

This paper presents a 60-GHz 4 × differential -fed patch antenna array using low-temperature cofired ceramic (LTCC) process. Wideband with L-shaped feeding scheme is adopted as element, while substrate integrated waveguide network low insertion loss applied for the integration of array. The differentialfed structure improves symmetry radiation patterns and reduces cross-polarization level significantly. To further suppress surface wave improve gain array, one kind soft proposed. equivalent...

A new kind of compact dual-mode dual-composite right-/left-handed resonators is proposed. Dual-band bandpass filters (BPFs) are consequently designed with over 88% size reduction. To assist the filter design, an analytical design method further presented, which one can be flexibly according to desired frequencies and bandwidths (BWs). alleviate difficulties, a synthesis technique feedback-based optimization process both employed. In addition, independent control frequencies, BWs, coupling...

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 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...

A wideband and high-efficiency power amplifier (PA) based on a bandpass filtering (BPF) matching network is presented. Composite right-/left-handed (CRLH) cell dual-CRLH (D-CRLH) are employed to realize the BPF with an absorbed bias circuit. The equivalent circuit model of proposed given synthesized design method introduced. Furthermore, one gallium nitride (GaN) PA high efficiency achieved by using accordingly. measured S-parameters reveal response from 1.2 2.3 GHz ±1.2-dB gain flatness...

A novel class of low-temperature cofired ceramic (LTCC) bandpass filters (BPFs) is proposed in this paper, featuring compact size and good filtering responses both microwave millimeter-wave (mm-wave) bands. By effectively merging the lumped elements distributed effects, a modified LTCC-based hybrid resonator (HLDR) introduced. In detail, part LTCC interdigital capacitor high-impedance line used to reduce circuit size, loss, cross-talks. The part, saying, mutual couplings between adjacent...

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...

One kind of miniaturized filtering power divider (FPD) with a new topology is proposed. For previously published FPDs, the isolation resistors were usually added additional quarter-wave (λ/4) transmission lines for output isolation. In this paper, λ/4 are removed, and resistor to loaded resonator design. By regarding input external quality factor (Q <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e-in</sub> ) as an admittance inverter,...

The characteristics of a modified dual composite right/left-handed (D-CRLH) unit cell is investigated, which can be applied to design bandpass filters. proposed very compact and contains ten structural variables, provides large flexibility realize different frequency responses. To assist the D-CRLH cells, resonant are analyzed, strategies for performance improvements given accordingly. Furthermore, method filters introduced, with desired obtained by dimensions modifications adopted...

The realization method of multiple transmission zeroes (TZs) for second-order bandpass filters (BPFs) is presented in this brief. A modified filter topology with mixed couplings investigated at first. With the cancelation effect electric and dominant magnetic couplings, two close-to-passband TZs can be easily realized a inline filter. Furthermore, dual-function feature loaded quarter-wavelength (λ/4) resonators analyzed. Besides filtering response, λ/4 used to realize more stopband. At last,...

This article presents an analytical design for millimeter-wave monolithic microwave integrated circuit (MMIC) switches. First, the field-effect-transistor-based (FET-based) resonator is proposed, whose resonant frequency and bandwidth can be controlled flexibly. As a result, flexibility of MMIC switches highly improved by using FET-based resonators. Second, fast flexible impedance matching technique presented based on coupling matrix method. By selecting appropriate parameters, easily...

Aiming at high and wideband output isolation, a new topology of filtering power divider based on complex isolation impedance surface wave mitigation techniques is proposed. Different from previously published dividers using pure resistor, an analytical design method by proposed in this article. To formula the impedance, LC equivalent circuit model introduced, closed-form derivation given accordingly. Based calculated can be theoretically realized level. However, limited below 20 dB practical...

A miniaturized Ka-band bandpass filter (BPF) is presented by using monolithic microwave integrated circuit (MMIC) technology in this brief. Aiming at low cost and high integration, small die area of MMIC BPFs significantly required for RF front-end modules.However, the filtering performance negatively correlated to its miniaturization. To end, folded hybrid resonator investigated brief, which composed a quasi-lumped capacitor distributed microstrip line. realize miniaturization, two metal...

This article presents a series of vertically stacked millimeter-wave (mm-wave) bandpass filters (BPFs) based on low-temperature cofired ceramic (LTCC) technology. First, coupling topology with multiple ground planes is proposed for LTCC filters. As its benefits, the unwanted electric between adjacent resonators avoided, while to enhanced, contributing higher stopband suppression levels. Moreover, over 50% size reduction also realized by using vertical topology. Second, common issue...

A novel kind of tri-band bandpass filter (BPF) is presented, which based on the dual composite right- and left-handed resonator. The proposed BPF very compact with over 30% size reduction previously published ones. center frequencies bandwidths can be controlled independently large flexibility. In addition, return losses also adjusted independently, resulting in optimal impedance matching for designs. Finally, one designed demonstration, simultaneously exhibits circuit preferable in-band...