A Low-Loss Serial Power Combiner Using Novel Suspended Stripline Couplers

Yukihiro TAHARA  Hideyuki OH-HASHI  Kazuyuki TOTANI  Moriyasu MIYAZAKI  Sei-ichi SAITO  Osami ISHIDA  

IEICE TRANSACTIONS on Electronics   Vol.E88-C    No.1    pp.15-19
Publication Date: 2005/01/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.1.15
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
directional coupler,  suspended stripline,  power combiner,  

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A low-loss serial power combiner using suspended stripline is described. It consists of novel broadside-coupled directional couplers which have shunt capacitances at the edges of the coupled sections. These additional shunt capacitances compensate for poor directivities of the couplers because of inhomogeneous dielectric in suspended stripline structure. The fabricated three-way power combiner has achieved good performance with insertion loss less than 0.23 dB over a bandwidth of 10% in 2 GHz band.