A novel miniaturized forward-wave directional coupler loaded with periodic shunt inductors

Author

Yen, Jui-Chih ; Hsu, Sen-Kuei ; Wu, Tzong-Lin

Author_Institution

Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan

fYear

2011

fDate

10-13 Oct. 2011

Firstpage

782

Lastpage

785

Abstract

A novel miniaturized forward-wave directional coupler loaded with periodic shunt inductors is presented. Considerable phase difference between even- and odd-mode is obtained. This contributes to enhanced forward coupling and size reduction. A simple but accurate equivalent model of a unit- cell is developed to predict the dispersion relations and the characteristic impedances for both even- and odd-mode. Besides, by controlling the total length of the coupler, the input impedances of the both two modes can be perfectly matched. A test sample is fabricated on FR4 substrate. The coupling level of 1.1 dB can be measured at 3.9 GHz with the total length 1.04 λ_g.

Keywords

directional couplers; inductors; FR4 substrate; characteristic impedances; dispersion relations; forward coupling; frequency 3.9 GHz; miniaturized-forwardwave directional coupler; periodic shunt inductors; phase difference; size reduction; Couplings; Directional couplers; Frequency measurement; Inductors; Microstrip; Shunt (electrical); Directional couplers; periodic structures;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference (EuMC), 2011 41st European

Conference_Location

Manchester

Print_ISBN

978-1-61284-235-6

Type

conf

Filename

6101682