High-Selectivity Reflectionless Unbalanced-to-Balanced Filtering Power Combiner
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A high-selectivity reflectionless unbalanced-to-balanced (UTB) filtering power combiner is proposed. The proposed power combiner composes of two absorbing branches, two filtering sections, two transmission lines, a grounded resistor, and a phase inverter. Two transmission zeros respectively located at the lower and upper sides of the passband are achieved by the filtering sections, resulting in high selectivity. The input-port reflectionless response in the bandstop region is obtained by the absorbing branch. A 1.0-GHz UTB filtering power combiner is designed and fabricated. Finally, the measurement performances are given in this paper. The input-reflection absorptive bandwidth and transmission bandwidth are measured as 545 MHz and 132 MHz, respectively. The absorptive bandwidth is 4.12 times the transmission bandwidth.
KeywordsPower combiner, reflectionless response, unbalanced-to-balanced, high-selectivity filtering
Document typePeer reviewed
Document versionFinal PDF
SourceRadioengineering. 2021 vol. 30, č. 3, s. 517-523. ISSN 1210-2512
- 2021/3