Coplanar waveguide structure of the differential connector impedance control

Shenqing, Kuang; Le, Hu; Wu, Fei; Zhao, Ming

doi:10.1109/isape.2008.4735404

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…However, up to now, most of the research considered tunability methods such as the use of microelectrical mechanical system (MEMS) [3], varactors [4], or other types of circuitry requiring external electrical biasing [5]. In this article, we present a novel tunable microwave filter based on an alternate method: direct optical control of a hybrid polymer material's permittivity.…”

Section: Resultsmentioning

confidence: 99%

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Design of broadband double‐curved cross dipole ESPAR antennas

Kyaw

Choi

2016

Micro & Optical Tech Letters

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The design of a broadband ESPAR (electrically steerable passive array radiator) antenna for broadband modern communication systems is proposed in this article. A compact broadband cross dipole ESPAR antenna comprises of single active element with cross type and six parasitic elements with cylindrical type. The cross dipole of active element modified with double-curved each radius. Reactance devices are loaded on each parasitic element to control radiation pattern. It satisfied return loss less than 210 dB from bandwidth 2.35 GHz and 2.48 GHz. The radiation patterns are in the same direction and gain has each 4.5 dBi, 4.6 dBi, and 5.3 dBi at resonant frequencies 2.35 GHz, 2.42 GHz, and 2.48 GHz, respectively.ABSTRACT: A new optically tunable low-pass filter (LPF) is presented with a cutoff frequency ranging from 13.71 GHz to 14.79 GHz. Tunability is achieved based on a novel metal insulator metal (MIM) capacitor having a photorefractive insulator that shows 13% change in capacitance. The LPF has been fabricated and measured, and a simple lumped element model extracted to analyze its behavior. The improved meshed MIM capacitor employed in the LPF marks a practical demonstration of an optically tuned filter.

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Section: Resultsmentioning

confidence: 99%

“…The structure of BB‐ESPAR is designed to support any sub‐band. Coplanar waveguide CPW structure as a feeding element satisfies not only good characteristics impedance but also enhances frequency wideband by curving of the edge . Therefore, we designed cross CPW Dipole ESPAR antenna.…”

Section: Introductionmentioning

confidence: 99%

Design of broadband double‐curved cross dipole ESPAR antennas

Kyaw

Choi

2016

Micro & Optical Tech Letters

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“…In each model, a differential signaling structure renowned for its robust resistance to noise, commonly employed in high-speed lines, was applied. About this, the most suitable termination method chosen was to set the termination resistance of the differential lines to 100Ω [19]. This decision was made considering increased compatibility and standardization within the industry, aiming to mitigate signal reflections, waveform distortion, and noise through impedance matching efforts.…”

Section: Proposed Methodsmentioning

confidence: 99%

Low Loss Hybrid-Plane PCB Structure for Improving Signal Quality in High-Speed Signal Transmission

Choi,

Kim

2024

IEEE Access

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Due to the inherent loss characteristics of transmission lines today, the challenges in signal transmission are increasing. Typically, the most widely used Printed Circuit Boards (PCBs) in transmission lines employ FR-4 as the insulation material due to its advantages in electrical insulation and costeffectiveness. Nevertheless, PCBs that rely solely on FR-4 for the entire insulation layer are unsuitable for high-speed circuits due to significant dielectric losses. Efforts have been made to reduce losses by researching hybrid-stackup PCBs that stack low loss dielectric materials vertically. However, due to the high cost of these low loss dielectric materials, they have mainly been applied in high-end and high-speed applications. Therefore, in this paper, we propose a hybrid-plane PCB structure that uses low loss dielectric materials only in the planes adjacent to high-speed signal traces, minimizing the use of expensive low loss dielectric materials while achieving similar enhancements in signal quality compared to previously researched hybridstackup Each PCB was modeled using Ansys Q2D Extractor, and S-parameters and eye diagrams were extracted for each to compare their electrical characteristics and signal quality. The simulation results confirm that the proposed hybrid-plane PCB structure in this paper has been found to exhibit improved electrical characteristics compared to PCBs constructed solely with an FR-4 insulation layer. Furthermore, various low loss dielectric thicknesses were compared to interpret the optimal thickness of the low loss dielectric for the hybrid-plane PCB, based on the signal integrity assurance rate.

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