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Design of A Dual Band Branch Line Coupler Using a CRLH Transmission Line Structure  

Park, Min-Woo (순천향대 전기통신공학과)
Koo, Ja-Kyung (순천향대 전기통신공학과)
Lim, Jong-Sik (순천향대 전기통신공학과)
Jeong, Yong-Chae (전북대 전자정보공학부)
Ahn, Dal (순천향대 전기통신공학과)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.58, no.12, 2009 , pp. 2462-2467 More about this Journal
Abstract
This paper proposes a dual band branch line coupler (BLC) using a composite right/left handed (CRLH) transmission line. The existing dual band BLCs with open stubs require hundreds of line impedance for the open stub as the frequency bands approach to each other, so it has been almost impossible to realize them. However in the proposed BLC, a CRLH transmission line replaces the open stub with an extremely high line impedance so that the BLC circuit may be realized even two frequencies are close to each other. As an example, a dual band BLC operating at 1800MHz and 2300MHz (the frequency ratio is 1:1.28) is designed and measured. Open stubs with $560\Omega$ line impedance are replaced by CRLH transmission lines for realizing the dual band BLC. The measured performances prove that the dual band operation is well acceptable and the proposed design method is successful even the ratio between two frequencies is not around two nor more.
Keywords
Composite right/left handed; CRLH; Dual band; Branch line coupler;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 0
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