1) School of Optical and Electronic Information, Huazhong University of Science and Technology
dual-band coupler, compact size, three-branch-line structure, dual transmission lines
The final version of this article with its full bibliographical information is available. To access the article, click here (Vol. 14 (2017), No. 18 pp. 20170834-20170834).
This letter presents a compact dual-band branch-line coupler. Explicit design formulas of the three-branch-line coupler (3-BLC) are derived and useful design curves are given. The equivalent dual transmission lines structure is used to decrease the dimension, and also the partial branch lines are folded to further miniaturize the design. The proposed dual-band (2.45 and 5.8 GHz) coupler has a compact size with 57.6% size reduction compared with the conventional circuit. The measured and simulated results are in good agreement with each other.
Edited and published by : The Institute of Electronics, Information and Communication Engineers Produced and listed by : Komiyama Printing Co., LTD.