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A broadband microstrip-to-CPS transition using composite right/left-handed transmission lines with an antenna application

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3 Author(s)
Cheng-Jung Lee ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; K. M. K. H. Leong ; Tatsuo Itoh

A broadband microstrip-to-coplanar strip (CPS) transition employing composite right/left handed (CRLH) transmission line technology is presented. The transition is based on the unique phase slope and offset control properties of the CRLH transmission line. The pairing of a microstrip delay line and the CRLH transmission line has a broadband out-of-phase characteristic, thus enabling the broadband transition between microstrip and CPS. An unbalanced and a balanced type of transition are built and tested. A 3dB insertion loss bandwidth of 85% and 80% can be achieved by connecting the transition back-to- back for the unbalanced and balanced type, respectively. To demonstrate the applicability of the proposed microstrip-to-CPS transition, a modified quasi-Yagi antenna is designed. An impedance bandwidth of 65% can be obtained, showing a 15% improvement compared to the conventional one.

Published in:

IEEE MTT-S International Microwave Symposium Digest, 2005.

Date of Conference:

12-17 June 2005