Results 261 to 270 of about 29,052 (301)

High-efficiency hybrid surface-normal coupler design

Journal of the Korean Physical Society, 2013
Based on an analysis of the grating coupler, a high-efficiency hybrid surface-normal coupler, which is a combination of a coupler grating, reflector grating and a bottom mirror, was designed to couple a planar waveguide and a single-mode fiber. The negative second-order reflection was reduced by destructive interference by selecting a reasonable ...
Hua Wu, Xia Guo, Ming-Fu Han
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Broadband hybrid microstrip couplers—Amplitude and phase

Microwave and Optical Technology Letters, 2002
AbstractSeveral designs for a 180° hybrid coupler are discussed. Using the stepped‐impedance method, the bandwidth of an 11 GHz hybrid coupler is increased to approximately 1.6 times the bandwidth of a conventional hybrid coupler. Comparisons are made between conventional and broadband hybrid couplers, as well as between circular and rectangular ...
Cham Kiong Queck, Lionel E. Davis
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Miniaturization Design for Planar Hybrid Ring Couplers

2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components, 2008
Miniaturization of a microstrip rat race coupler is implemented by three approaches. First, a new rat race hybrid design is devised for circuit miniaturization based on the periodic stepped-impedance ring structure. The circuit has a normalized area of 21.5%.
Yi-Chyun Chiou, Cheng-Hsiu Tsai, Juo-Shiuan Wu, Jen-Tsai Kuo   +3 more
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Dual‐band hybrid coupler with extended bandwidth

Microwave and Optical Technology Letters, 2010
AbstractA dual‐band branch‐line quadrature coupler with extended bandwidth using simple three‐section branch line is presented.This proposed design exhibits larger bandwidth than existing dual‐band designs reported in previous literature. A dual‐band branch‐line coupler was designed and measured to give 34.5 and 16.4% bandwidth in the lower band and ...
King Yin Cheung, Shao Yong Zheng, Wing Shing Chan, Kim Fung Man   +3 more
openaire   +1 more source

Hybrid metal-insulator plasmonic slab directional coupler

2013 21st Iranian Conference on Electrical Engineering (ICEE), 2013
A new two-dimensional plasmonic directional coupler is proposed based on the hybrid metal-insulator slab waveguide (HMISW). It is analyzed using the super mode theory (SMT) based on solving the symmetrical and antisymmetrical modes with the aim of transfer matrix method (TMM).
Mahmoud Talafi Noghani, Mohammad H. Vadjed Samiei   +1 more
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Varactor-Tuned Dual-Band Quadrature Hybrid Coupler

IEEE Microwave and Wireless Components Letters, 2006
A tunable dual-band quadrature hybrid coupler for mobile GSM bands (900 and 1800MHz) is proposed and characterized. The structure is composed of four quarter-wavelength sections at a frequency located between the two operating frequencies and two pairs of open-ended stubs.
E.E. Djoumessi, E. Marsan, C. Caloz, M. Chaker, K. Wu   +4 more
openaire   +2 more sources

A Hybrid Coupler for Microstrip Configuration

MTT-S International Microwave Symposium Digest, 2005
A hybrid coupler for microstrip, modelled along the lines of the "re-entrant coupled section" of a coaxial system, is described. Complete design information is available, leading to the realization of these circuits up to 18 GHz with good accuracy.
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X Band Miniaturized 90° Hybrid Coupler

2022 IEEE Wireless Antenna and Microwave Symposium (WAMS), 2022
A. Nidhi Madhuri, A. Bharathi, M. Swetha
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Couplers, hybrids and splitters

IEEE MTT-S International Microwave Symposium Digest, 2005., 2005
A. Fathy, M. Abouzahra
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Circular-electric-mode hybrid coupler

IEE Proceedings H Microwaves, Antennas and Propagation, 1985
A.J. Sangster, D.J. McIntosh
openaire   +1 more source