DocumentCode :
662268
Title :
Miniaturized branch-line coupler with coupling-dependent dual-frequency operation
Author :
Tse-Yu Chen ; Pei-Ling Chi ; Ting-Tsan Lin
Author_Institution :
Electr. & Comput. Eng. Dept., Nat. Chiao Tung Univ., Hsinchu, Taiwan
fYear :
2013
fDate :
5-8 Nov. 2013
Firstpage :
360
Lastpage :
362
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 :
UHF couplers; high-frequency transmission lines; coupling-dependent dual-frequency operation; dual-band frequency ratio; dual-band separation; frequency 0.9 GHz to 1.8 GHz; miniaturized branch-line coupler; transmission line element; Couplers; Couplings; Dual band; Impedance; Ports (Computers); Power transmission lines; Transmission line measurements; Branch-line coupler; coupled line; dual-band;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Conference Proceedings (APMC), 2013 Asia-Pacific
Conference_Location :
Seoul
Type :
conf
DOI :
10.1109/APMC.2013.6695146
Filename :
6695146
Link To Document :
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