Design of Miniaturized 10dB Wideband Branch Line Coupler Using Dual and T-Shape Transmission Lines

This paper presents a design mechanism of miniaturized wideband branch line coupler (BLC) with loose coupling of 10 dB. Dual transmission lines are used as a feed network which provides a size reduction of 32% with a fractional bandwidth (FBW) of 60% for 10±0.5 dB coupling but return loss performance is found to be poor in the operating band. For further improvement of return loss performance as well as for size reduction of the BLC, a T- shape transmission lines are used instead of series quarter wavelength transmission lines, and hence the overall size reduction of around 44% with FBW of 50.4% is achieved. The return loss and isolation performance is found to be < 15 dB in the entire operating band (2.5–4.1 GHz) with respect to design frequency 3G Hz. The proposed BLC is analyzed, fabricated and tested.

Keywords

Branch line coupler, dual line, miniaturization, T- shape transmission line (TL), wideband

Citation

Radioengineering. 2018 vol. 27, č. 1, s. 207-213. ISSN 1210-2512
https://www.radioeng.cz/fulltexts/2018/18_01_0207_0213.pdf

Document type

Peer-reviewed

Document version

Published version

Language of document

en

Document licence

Creative Commons Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/