@inproceedings{0a0f388ce53d4314bf58ab2a79d4c1a0,
title = "A bandwidth-enhanced 3-dB lumped-element branch-line coupler based on asymmetrical E-equivalent sections",
abstract = "In this paper, a new 3-dB lumped-element branch-line coupler using asymmetrical E-equivalent sections is proposed, designed, and experimentally verified. The proposed asymmetrical E-equivalent section is evolved from the high- and low-impedance transmission line structure. As the transmission lines of the conventional branch-line coupler are replaced by the asymmetrical lumped-element E-equivalent sections, it can enhance the return loss bandwidth. The measured |S 11| of the developed coupler is better than 10 dB from 0.751 GHz to 1.158 GHz with a 42.6 \% relative bandwidth. It is broader than that of the conventional distributed branch-line coupler. Considering 90° ± 5° phase difference, the frequency range covers from 0.785 GHz to 1.107 GHz with a 34 \% relative bandwidth.",
keywords = "branch-line coupler, lumped-element, microwave circuits, Quadrature coupler",
author = "Mou, \{Chia Hung\} and Tseng, \{Chao Hsiung\}",
year = "2011",
language = "English",
isbn = "9780858259744",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
pages = "29--32",
booktitle = "Asia-Pacific Microwave Conference Proceedings, APMC 2011",
note = "Asia-Pacific Microwave Conference, APMC 2011 ; Conference date: 05-12-2011 Through 08-12-2011",
}