Isolation-improved branch-line coupler based on feed-forward technique

Author

Ahn, Byung-Jun ; Kim, Sang-Kyu ; Yook, Jong-Gwan

Author_Institution

Dept. of Electr. & Electron. Eng., Yonsei Univ., South Korea

Volume

1

fYear

2005

fDate

4-7 Dec. 2005

Abstract

In this paper, the improved feed-forward technique to enhance the isolation of a Tx/Rx is presented. It is particularly suitable for Tx/Rx antenna applications and also could be implemented in MMICs. It is achieved about -55 dB isolation after applying feed-forward technique to the branch-line coupler. The proposed feed-forward structure is implemented using the branch-line coupler, the coupled line and the Wilkinson combiner, especially consisted of only microstrip lines, without implementation of other devices like phase shifter and attenuator or application of multi-layer, at ISM band of 5.8 GHz.

Keywords

MMIC; feedforward; microstrip components; microstrip couplers; microstrip lines; power combiners; waveguide couplers; 5.8 GHz; ISM band; MMIC; Tx-Rx antenna applications; Wilkinson combiner; feed-forward technique; isolation-improved branch line coupler; microstrip lines; Couplings; Delay; Feedforward systems; Microstrip; Noise cancellation; Nonlinear distortion; Phase distortion; Power amplifiers; Topology; Transmitting antennas; Branch-line coupler; feed-forward; isolation;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings

Print_ISBN

0-7803-9433-X

Type

conf

DOI

10.1109/APMC.2005.1606300

Filename

1606300