Miniaturized Antenna Duplexers for Portable Radio Telephone Terminals

Morikazu SAGAWA  Mitsuo MAKIMOTO  Kazuhiro EGUCHI  Fumio FUKUSHIMA  

IEICE TRANSACTIONS on Electronics   Vol.E74-C   No.5   pp.1221-1225
Publication Date: 1991/05/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on the 3rd Asia-Pacific Microwave Conference)
Category: Passive Components

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This paper describes newly development compact square-shaped stepped impedance resonators (SIR's) and their application to antenna duplexers. The new square-shaped SIR's are devised in consideration of an optimized resonator structure for miniaturization. Fundamental properties such as the effect of the tapered section and unloaded Q of the square-shaped SIR's are studied. Experimental antenna duplexers using the new SIR's perform excellently and have compact size and light weight as expected. These results prove that they are suitable for use in portable radio telephone terminals.