@inproceedings{5f620b92c72a48c08353ef1ee47ec2a7,
title = "Miniaturized branch-line coupler with coupling-dependent dual-frequency operation",
abstract = "A miniaturized branch-line coupler that is able to operate at two arbitrary frequencies is presented in this paper. The dual-band frequency ratio depends on the coupling coefficient in the proposed transmission line element. It will be shown later that the dual-band separation decreases as the coupling strength increases. By replacing the traditional quarter-wavelength lines with the proposed artificial transmission lines of a prescribed coupling coefficient, a size-reduced branch-line coupler can be implemented at dual frequencies of interest. An example of the 0.9- and 1.8-GHz branch-line coupler, which corresponds to a band ratio of 2, is experimentally developed and characterized. The presented coupler occupies only 44% footprint of the conventional coupler operating at the lower frequency of the dual-band operation. Excellent agreement between the simulated and measured results is obtained.",
keywords = "Branch-line coupler, coupled line, dual-band",
author = "Chen, {Tse Yu} and Pei-Ling Chi and Lin, {Ting Tsan}",
year = "2013",
month = dec,
day = "1",
doi = "10.1109/APMC.2013.6695146",
language = "English",
isbn = "9781479914746",
series = "Asia-Pacific Microwave Conference Proceedings, APMC",
pages = "360--362",
booktitle = "2013 Asia-Pacific Microwave Conference Proceedings, APMC 2013",
note = "null ; Conference date: 05-11-2013 Through 08-11-2013",
}