With the rapid development of modern communication and radar technology, there is a need for miniaturization, planarization, modularization microwave millimeter-wave (mm-wave) systems, without losing excellent performance reliability. The transmission line most basic component mm-wave circuits its characteristics-including loss, size, integration, cost, weight-directly or indirectly affect entire circuit system. Commonly used lines [1] include nonplanar lines, such as metal waveguide coaxial...

This paper proposes a low-loss Butler matrix using patch element and honeycomb concept on substrate integrated suspended line (SISL) platform. The SISL is composed of four couplers, two crossovers, phase shifters. Both the coupler crossover are implemented elements for ease fabrication low conductor loss. We adopt to integrate all required components together form as an whole. Every component assigned with individual cavity, via holes designed between adjacent cavities fence, which makes...

A novel transition from substrate integrated suspended line (SISL) to conductor backed coplanar waveguide (CBCPW) is proposed in this letter. The utilizing the standard PCB techniques eliminates drawbacks of traditional circuits and integrates effectively. new a self-packaged system verified by both simulation experiment results. Back-to-back structure has insertion loss less than 0.6 dB return better 15 dc 8 GHz.

A novel compact branch-line coupler using substrate integrated suspended line (SISL) technology is proposed in this letter. In order to reduce the size of conventional coupler, we propose a slow wave structure, which composed high-low impedance lines cascaded meander configuration, and 62% reduction has been achieved. Moreover, fabricated by standard printed circuit board process, SISL advantages self-packaging, low cost light weight.

This paper presents a 1 × 4 cavity-backed endfire dipole antenna array based on substrate-integrated suspended line (SISL) platform. A double-side SISL (DSISL) self-packaged feeding network with irregular boundaries is designed for the array. By utilizing DSISL network, radiation loss and substrate of feed are effectively decreased, thus efficiency better than 91% achieved. Instead conventional metallic cavity, proposed cavity structure realized by multiple layers. predominantly TE <sub...

In plants, FK506-binding proteins (FKBPs) have been shown to participate in various biological processes such as photosynthetic system reaction, stress response, and growth development. However, the roles of FKBPs cotton are less well known. this study, we investigated FKBP family genes on a genome-wide scale four Gossypium species. A total 147 were identified from these species placed into three classes based phylogenetic analysis. Collinearity analysis indicated that whole-genome...

This article proposed a codesign of power amplifier (PA) and bandpass filter (BPF) named filtering PA using metal integrated substrate suspended line (MI-SISL). Two BPFs are designed separately as the input output matching network to realize response good harmonic suppression at same time. The BPF circuits implemented SISL-based dual-layer interdigital capacitors for miniaturization spiral inductors low loss. is patterned according shape core circuit, which helps reduce circuit loss improve...

This paper presents the realization of two second-order quasi-elliptic ferroelectric tunable bandpass filters for millimeter-wave applications in <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$Ka$</tex></formula> - and Notation="TeX">$U$</tex></formula> -band, respectively. These include a coplanar-waveguide topology implemented on epitaxial barium–strontium–titanate-on-sapphire technology. The...

In this brief, a universal coupled topology to design cascaded multiple passbands bandpass filters (BPFs) with numerous in-band poles and out-band transmission zeros (TZs) is presented. Based on the proposed topology, coupling matrices are constructed multiband (MBPFs) trisection (CT) BPFs' filtering responses. To validate theory topologies, quad-band CT BPFs TZs located in each lower sub-band successfully synthesized firstly. Then, dual-band tri-band BPF generated upper side of passband...

This letter presents a 2-D endfire <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">E</i> plane horn antenna array with novel feeding structure named by substrate integrated suspended line (SISL) vertically waveguide (SISL-VW). Compared to the conventional all metal counterpart, proposed is composite of printed circuit board (PCB) and thus, it possesses merits low cost, light weight easy integration planar circuits. Different from transmission...

This paper presents a slow-wave rat-race coupler using substrate integrated suspended line (SISL) technology. Double-sided interconnected strip (DSISL) is utilized to further reduce the loss of circuit. Using DSISL concept, structure based on modified meander configuration proposed. Formed by simple circuit topology with only three parameters one unit cell, characteristic impedance and factor proposed can be controlled separately. Utilizing DSISL, at 1.5 GHz has been designed fabricated...

In this article, a novel design method of dual-band and dual-state (DBDS) Doherty power amplifier (DPA) is proposed. Considering the actual parasitic parameters, DPA can be designed by using impedance transformation saturation back-off points at dual frequency bands DBDS as well second harmonic matching. The for (DB) 5G application, i.e., 3.4 4.9 GHz band are implemented, first time, metal-integrated substrate-integrated suspended line (MI-SISL) technology, which has advantages high...

This paper presents a novel compact low loss switchable bandpass filter (BPF) with self-packaging by using substrate-integrated suspended line (SISL) technology. The proposed self-packaged BPFs are designed two kinds of controllable resonators, which smaller than quarter-wavelength resonator and the commercial p-i-n diodes used as control elements. method is investigated an equivalent circuit model. center frequency SISL BPF at 1 GHz 56% fractional bandwidth. measurement results show that...

In this study, the loss mechanism of substrate integrated suspended line (SISL) is investigated and experimental verification given. The strategy to reduce total circuit losses, including radiation loss, conductor dielectric based on SISL platform, investigated. For three cases in form uniform transmission lines, their characteristic impedance, phase constant, attenuation constant are simulated compared. influences caused by height air cavity, distance between centre trace side wall,...

In this paper, a novel triplexer using the substrate-integrated suspended line technology is proposed. Two matching circuits are designed to connect three filter channels for construction. The used bandpass filters composed of low-pass and high-pass filter, they have advantages high controllability low insertion loss. For proposed triplexer, two adjacent compose duplexer. Based on design consideration, can be extended multiplexer. further improved by patterned substrate loss reduction....