A TM010 Cavity Power-Combiner with Microstrip Line Inputs

Vinay RAVINDRA  Hirobumi SAITO  Jiro HIROKAWA  Miao ZHANG  Atsushi TOMIKI  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.12   pp.1087-1096
Publication Date: 2017/12/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.1087
Type of Manuscript: PAPER
Category: Microwaves, Millimeter-Waves
cavities,  resonators,  power combiners,  computer-aided design of microwave,  power amplifiers,  

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A TM010 cavity power combiner is presented, which achieves direct interface to microstrip lines via magnetic field coupling. A prototype is fabricated and its S-matrix measured. From the S-parameters we calculate that it shows less than 0.85 dB insertion loss over 250 MHz bandwidth at X-band. The return power to the input ports is less than -15 dB over this bandwidth. We verify the insertion loss estimation using S-matrix, by measuring transmission S-parameter of a concatenated 2-port divider-combiner network. Similarly analyzed is the case of performance of power combiner when one of the input fails. We find that we can achieve graceful degradation provided we ensure some particular reflection phase at the degraded port.