H-Plane Manifold-Type Broadband Triplexer with Closely Arranged Junctions

Tamotsu NISHINO  Moriyasu MIYAZAKI  Toshiyuki HORIE  Hideki ASAO  Shinichi BETSUDAN  Yasunori IWASA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E82-C   No.5   pp.774-780
Publication Date: 1999/05/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Microwave and Millimeter Wave Technology
Keyword: 
manifold-type triplexer,  broadband characteristics,  mode matching technique,  asymmetric cross junctions,  numerical optimization,  Marquadt method,  

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Summary: 
We propose an H-plane manifold-type triplexer with closely arranged junctions. Broadband characteristics for each bands are obtained by arranging filters closely near the end of the common waveguide. Three fundamental and sufficient parameters are introduced for numerical optimizations to determine the configuration of the broadband triplexer. The configuration including closely arranged junctions requires an generalized scattering matrix (GS matrix) of an asymmetric cross junction to simulate and design. We expand the mode matching technique (MMT) to be able to analyze this kind of discontinuities by joining two asymmetric steps discontinuities to a symmetric cross junction. This is suitable expressions for numerical calculations. The characteristics of the whole triplexer are obtained by cascading GS matrices of the corresponding discontinuities. The experimental results of the fabricated triplexer were compared with the simulated data, and the results agree well with the simulated one. The characteristics of the fabricated triplexer satisfy the request of the broad band operation and high power-handling capability.