SignificanceDifferent from most existing multistable structures whose multiple stable states are achieved through the combinational effect of bistable units, we invent a generic tristable kirigami cuboid. The three have fundamentally distinct geometric configurations and chirality, transformation among them can be realized by tension/compression or clockwise/counterclockwise twist. Tessellating units in series, family metamaterials constructed, mechanical behaviors which programmable unit...

This paper presents the characteristics of a miniaturized microstrip filter, which has two separate coupling paths: electric path and magnetic between resonators. Either or in paths can be dominant total coefficient inter-stage resonators with similar configuration, but different positions transmission zero points (ZPs). Based on proposed filter topology, second- fourth-order filters have been designed fabricated for first time. Advantages using this type are not only its low insertion loss...

This letter reports a novel back-to-back E-shaped defected ground structure (DGS) and two-side loading scheme for miniaturized dual-band substrate integrated waveguide (SIW) bandpass filter designs.The SIW loaded by DGS supports evanescent-mode wave propagation below the cut-off frequency of SIW, while achieves two transmission poles at passband controllable zero points.Furthermore, different-sized resonators on sides is proposed designs.To validate design analysis, 2.4-/5.2-GHzfilter...

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...

We present a systematic study of the absorption, heating behavior, and microstructure evolution porous copper powder metal compacts subjected to 2.45 GHz microwave radiation explain our observations using known physical mechanisms. Using single-mode system, we place in pure electric (E) or magnetic (H) fields compare trends. also investigate effect particle size on same. The observed trends differences between E- H-field are reflected dramatic changes conductivity, permittivity, permeability...

A new type of low-pass filter (LPF) with ultra-wide band rejection and compact size by using a proposed transformed radial stubs (TRSs) is introduced investigated. The operating mechanism the investigated based on equivalent-circuit model. implemented LPF 1-dB cutoff frequency fc 3 GHz demonstrates stopband up to 8 i.e., 24 GHz. skirt selectivity achieved -144 dB per octave through multiple-zero generation TRSs. measured passband insertion loss less than 1.5 dB. I/O loading cells are used...

A 60-GHz on-chip multimode bandpass filter (BPF) is implemented using a sandwich capacitor. The proposed loaded capacitor shows functions of perturbation and stopband control in the BPF design. An additional magnetic coupling path from source to load introduced generate two extra zeros. Thus quasi-elliptical response achieved. with commercial SiGe BiCMOS process demonstrates low insertion loss 4 dB compact size only 0.16 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

Wideband power amplifiers (PAs) with high power-added efficiency (PAE) are required by software-defined radio and high-data-rate communications. A PA in Class-AB, which can provide linear amplification PAE better than Class-A, has been reported [1] to achieve bandwidth larger one octave. However, Class-AB operation generates a large amount of 2 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> -harmonic current at the transistor output,...

A dual-mode compressed dipole resonating at high-order modes is proposed to enhance bandwidth and directivity by loading the two arms with stubs. Characteristic mode analysis shows that introducing stubs, fifth-order of shifts close its third-order for achieving a wideband operation enhanced gain. prototype designed validate principle design approach experimentally. These measurements show gain 4 dBi, higher than conventional over desired operating band 3.3-3.6 GHz coming 5G applications.

In this letter, a compact and high-performance patch antenna array is developed for 60-GHz applications. The method to enhance both the gain frequency bandwidth of simultaneously by using parallel-series feed network together with differential feeding technique studied thoroughly. tested achieves operation ( ) from 55 68 GHz, which covers worldwide unlicensed band 57-66 peak 12.8-15.6 dBi. measured -3-dB beamwidths at 61.5 GHz are around ±13 <sup...

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...

This paper presents single-band bandpass filters (BPFs) and multiband (MBPFs) with enhanced selectivity based on vertically integrated substrate suspended line (SISL) folded patch resonators. Two types of SISL resonators significantly reduced sizes three novel topologies are introduced to design BPFs single or multi-band responses. To demonstrate the superiority proposed topology, first, a BPF open-ended miniaturized is proposed. Its transmission zeros (TZs) generation mechanism will be...

A compact ultra-wideband (UWB) bandpass filter with an ultra narrow notched band is proposed using a hybrid microstrip and coplanar waveguide (CPW) structure. The CPW detached-mode resonator (DMR) composed of quarter-wavelength (¿/4) nonuniform short-stub ¿/4 single-mode (SMCR) can allocate three split frequencies at the lower end, middle, higher end UWB passband. conventional broadside-coupled microstrip/CPW structure introduced to improve bandwidth enhancement around frequencies, which...

In this paper, compact ultra-wideband (UWB) bandpass filters with ultra-narrow dual- and quad-notched bands are proposed using the broadside-coupled microstrip/coplanar waveguide (CPW) structure. The multiple-modes UWB operation is obtained through CPW detached-mode resonator (DMR) microstrip/CPW transition. To avoid existing interferences such as wireless local-area network signals (i.e., 5.2- 5.8-GHz bands) in passband simultaneously, dual-notched can be finely employed independently...

This paper presents the design of a compact 60-GHz phase shifter that provides 5-bit digital control and 360° range for beam-forming systems. The is designed using proposed cross-coupled bridged T-type topology switched-varactor reflective-type topology. topologies are analyzed small-signal equivalent circuit model. Furthermore, equations derived investigated. To validate theoretical analysis, shifters in commercial 65-nm CMOS technology. fabricated features good performance 32 states from...

This work presents a millimeter-wave (mm-wave) dual-mode voltage-controlled oscillator (VCO) topology with switchable coupled VCO-cores for wide frequency tuning range and low phase noise application. By taking advantage of the different parasitic capacitance cross-coupled pair when VCO-core operates in ON OFF states, operation VCO can be realized, oscillations both modes excited at lower resonant tank, such that tank Q performance could improved modes. Strongly transformer large coupling...

This paper presents the analysis and design of a novel broadband low-noise amplifier (LNA) with larger than seven-octave bandwidth. To achieve good impedance matching, flat gain, low noise over bandwidth, combination technique shunt-resistive feedback, dual inductive-peaking techniques as well compact improved active load supporting RF biasing from dc to 20 GHz, is proposed for LNA design. The gain improvement principles are also analyzed theoretically. Based on theoretical study,...

In this letter, the novel ladder-like directors are proposed and investigated for antenna gain bandwidth enhancement. First, single-stage director is introduced to quasi-Yagi design improve directivity in endfire direction. Then, further enhance performance, multistages of form structures that co-designed with antenna, careful considerations mutual coupling effects. To validate concept, a 60-GHz using designed fabricated. The simulation results reveal an improvement 2.2–3.4 dB 30% by...

In this paper, the stress memorization technique (SMT) effects upon ultra-wideband RF switch performance are investigated for first time. Low insertion loss (IL), high isolation, (dc to 50 GHz) single-pole double-throw (SPDT), and four-throw (SP4T) switches designed with commercial 0.13- <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\mu \text{m}$ </tex-math></inline-formula> high-resistivity (HR)...

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 new spiral inductor based on substrate integrated suspended line (SISL) technology. SISL is type of transmission line, which has many merits, such as low loss, dispersion, and self-packaging. New series inductors this advanced platform proposed modeled in paper. to microstrip transition designed for the measurement inductor, an open-short deembedding method introduced accurate extraction network parameters. A π equivalent circuit model applied modeling double-sided...

Quasi-lumped-element low-pass filter (LPF) and high-pass (HPF) based on substrate-integrated suspended line (SISL) technology are presented in this paper. Double interdigital capacitor, which has advantages of high capacitance density quality factor, is analyzed designed to minimize the size. Based theoretical analysis, quasi-lumped-element SISL LPF HPF prototypes designed. The experimental results show that achieves ultra-wide stopband up 24 f <sub...