When an electromagnetic (EM) wave propagates in a medium whose properties are varied abruptly time, the experiences refractions and reflections known as time-refractions time-reflections, both manifesting spectral translation consequence of abrupt change conservation momentum. However, while time-refracted continues to propagate with same wave-vector, time-reflected backward conjugate phase despite lack any spatial interface. Importantly, time-refraction is always significant, observing...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-Affinity RNA Ligands to Escherichia coli Ribosomes and Ribosomal Protein S1: Comparison of Natural Unnatural Binding SitesSteven Ringquist, Thomas Jones, Eric E. Snyder, Terri Gibson, Irina Boni, Larry GoldCite this: Biochemistry 1995, 34, 11, 3640–3648Publication Date (Print):March 21, 1995Publication History Published online1 May 2002Published inissue 21 March...

This letter presents the substantial miniaturization of substrate integrated waveguide sensors using quarter-mode and ridged techniques, for detecting changes in relative humidity levels between 0%-80%. Miniaturizations 73.3% 86.2% are reported with resonant frequencies 6 GHz 6.9 two respectively. Furthermore, an increase sensitivity is achieved almost four times greater than previously reported. Due to reduced size increased sensitivity, these techniques open up new possibilities...

In this letter, we propose to integrate a microstrip antenna with commercial solar cells for CubeSat applications where there is small surface area available combination of antennas and cells. By placing the radiator an aperture-coupled patch under cells, it shown that directional system can be incorporated into without significant impact performance antenna. Considering stringent size restrictions involved in designs, proposed solution provides overall reduction design flexibility. The cell...

This paper characterizes the performance of a miniaturized folded ridged half-mode substrate integrated waveguide (SIW) and explores its use in quarter-mode bandpass filter (BPF) design. By folding fundamental mode SIW (RHMSIW) around capacitive ridge structure, an additional 50% miniaturization can be achieved over RHMSIW up to 87.5% compared with standard SIW. The monomode bandwidths both technologies are studied, yielding 1:4.28 or greater second-order ratios for all cases approximately...

A novel 4×4 Butler matrix fabricated on ridged half-mode substrate integrated waveguide (RHMSIW) technology is designed and realized. The integration of the proposed with tunable phase shifters using same also demonstrated to achieve semi-continuous beam steering for fifth-generation (5G) applications. This article discusses design considerations various subcomponents in detail presents two interconnects, namely 90° bends a open-edge-to-open-edge transition. shows that capacitive ridge open...

The miniaturization of microwave and millimeter-wave components is necessary to meet demand for increasingly smaller integrated circuits. This paper explores the technique capacitively loading open side a half-mode substrate-integrated waveguide (HMSIW) with continuous ridge in order lower first-mode cutoff frequency allow substantial miniaturization. full analytical calculation design presented, along extraction complex propagation constant analysis tradeoff between radiation conductor...

This letter demonstrates significant miniaturization of slotted half-mode substrate integrated waveguide filters by incorporating a capacitive ridge. Based on this concept, two-pole and four-pole bandpass are designed, fabricated measured. Simulations carried out using HFSS, the prototypes multi-layer printed circuit board process. The operate at 5.1 5.5 GHz have total width as small 5.2 mm. measured S-parameters illustrate insertion loss 0.8 dB stopbands larger than 8 GHz. Compared to...

This paper presents a miniaturized RF MEMS tunable bandpass filter design developed by application of folded ridged quarter-mode substrate integrated waveguide cavity. Using packaged SP4T chips, switchable reactive loading is applied to the cavity, tuning resonance frequency. Overall miniaturizations 70.3% and 78.8% are achieved for inductively- capacitively-loaded filters compared an using half-mode waveguide. Here, analysis inductive or capacitive along with their advantages disadvantages...

This paper presents the first wideband, fiber-free, integrated, planar semiconductor plasma switch demonstrated in DC-7 GHz range. The proposed solution is based on a low-cost integrated microlens that reduces system cost by at least 5x compared to state-of-the-art fiber-based solutions. In addition reduction, presented exhibits lowest reported loss (0.37 <0.5 dB) among technologies and high power handling of 35 W. Additionally, OFF -state isolation, where no light illuminated, 22 dB 2 GHz....

This paper presents the first demonstration of injection molding technology to enable large-scale mass manufacturing high-performance tunable microwave filters meet growing needs 5G small cell stations. is time that a filter satisfies all four following requirements simultaneously: low cost, high quality factor, wide tuning range, and power handling. Exhaustive research exists on use polymers for 3D device manufacturing; nonetheless, mass-production technologies, such as molding, can provide...

This letter demonstrates the first successful realization of a monolithic wafer-level integrated air-filled waveguide resonator in millimeter-wave W-band. The fabrication proposed design builds upon previously published processes by spin-coating two layers thick positive resist to construct channel. fabricated achieves an insertion loss 2.12 dB, unloaded quality factor 97.6, and 3-dB fractional bandwidth 3.0% at center frequency 76.6 GHz. concept illustrates new technique for filter such frequencies.

This article reports the design, fabrication, and measurement of a millimeter-wave (mm-wave) solid-state <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\pi $ </tex-math></inline-formula> -match waveguide switch using bulk silicon micromachining. A photogenerated plasma within post is utilized as switching element channel. Not only does this isolate bias network from RF signal path but also allows for...

This letter presents the design, fabrication, and measurement of a silicon micromachined photoconductive evanescent (EVA)-mode waveguide switch operating in single-pole double-throw (SPDT) configuration. Two EVA-mode waveguides loaded with posts are placed Y configuration common feeding waveguide. In absence photoexcitation, dielectric EVA channel exhibit bandpass filter response that allows low-loss propagation signals on order 2.0 dB at 96.7 GHz. When photoexcited, low conductive yield...

First Name is required invalid characters Last Email Address Invalid

This article shows the highest power handling and fastest switching speed of any previously reported compact solid-state plasma (SSP) switch. These improvements are made possible by thoroughly investigating design trade-offs, allowing essential performance metrics such as loss isolation to be maintained. In doing so, two different designs considered investigate trade-off between up through <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML"...

This paper presents a reconfigurable dual-band bandstop filter utilizing miniaturized folded ridged quarter-mode substrate integrated cavity. By loading cavity with capacitive ridge structure and folding the dominant field around said structure, significant miniaturization is achieved. Folded shown to reduce area of standard by 92%, while also increasing spurious-free region above fundamental mode. A using technology designed, fabricated, measured. In order generate independent tuning each...

We report for the first time redox properties of an anion-exchange ionomer membrane, tris(2,4,6-trimethoxyphenyl)polysulfone-methylene quaternary phosphonium chloride (TPQPCl). TPQPCl was solubilized in ethanol/water solutions and films at different concentrations were drop casted on glassy carbon electrodes. The thickness dry conditions evaluated using profilometer. charge transport coated electrodes investigated K4Fe(CN)6 as anionic probe. permselectivity assessed hexaammine ruthenium(II)...

Significant miniaturization of substrate integrated waveguides (SIW) is presented, utilizing folded techniques on ridged half-mode waveguide transmission lines. By moving the ridge structure inside main channel, transverse field distribution wrapped around two layers, achieving a 25.2% compared to SIW, and 56.7% SIW. The complex propagation constant extracted, showing negligible loss in performance structure, improved conventional To verify experimentally, SIW fabricated, measured scattering...

A novel miniaturized tunable phase shifter fabricated on ridged half-mode substrate integrated waveguide technology for 5G beamforming applications is presented in this paper. The theory behind periodically loading a transmission line with capacitors summarized and the measured results show good match simulation. device achieves 34.13% width reduction over similar design using HMSIW while maintaining comparable tunability of 102.4° at upper frequency band.

This paper presents the microfabrication of a miniaturized folded half-mode integrated waveguide cavity for operation at millimetre-wave frequencies in W-band. A is wrapped around middle metallization layer within its structure, effectively folding fundamental resonance mode. Compared to standard rectangular footprint, miniaturization on order 91% demonstrated. The has measured frequency 87.3 GHz, and unloaded quality factor 101. fabrication process completely monolithic, allowing...

This paper proposes a new miniaturized half-mode waveguide transmission line named the capacitively-loaded substrate integrated (CLHMSIW). The principle of design is studied, along with extraction simulated complex propagation constant. compared to (HMSIW), where it shown that miniaturizations are possible up 45% HMSIW. radiation losses near cutoff also be decreased An experimental realization presented, good agreement between simulation and measurement shown.