@inproceedings{38ae62d4e80943f59b11519c9aea7054,
title = "Bandwidth-enhanced branch-line coupler using the center-loaded vertical line and distributed capacitors",
abstract = "In this paper, the technique that loads the center of the horizontal transmission lines in a conventional branch-line coupler by a vertical line section as well as the distributed capacitors is presented to enhance the coupler bandwidths. Based on the proposed structure, the numerical solution derived from the even/odd-mode decomposition analysis for optimized bandwidth enhancement is applied for structural parameters. Experimental results show that the developed 90° coupler demonstrates more than 11% return-loss/isolation bandwidth increase as compared to the conventional quadrature hybrid. Furthermore, the 3dB±1dB magnitude-and 90°±5o phase-difference bandwidths are 3% and 14% increased, respectively.",
keywords = "Bandwidth enhancement, branch-line coupler, quadrature hybrid",
author = "Chen, {Tse Yu} and Pei-Ling Chi",
year = "2012",
month = dec,
day = "1",
doi = "10.1109/APMC.2012.6421801",
language = "English",
isbn = "9781457713309",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
pages = "989--991",
booktitle = "2012 Asia-Pacific Microwave Conference, APMC 2012 - Proceedings",
note = "null ; Conference date: 04-12-2012 Through 07-12-2012",
}