1-to- N ring power combiners with common delta ports

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Holzer, Kyle D.
Walling, Jeffrey S.
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In this paper, we present a new 1-to-N way ring combiner that is an adaptation of the ring-hybrid (rat-race) structure. We present the general design guidelines for N-way planar ring combiners based on theoretical analysis of the structures. The proposed 1-to-N way ring structure offers a compact, planar layout that includes a single common delta port. This is beneficial to applications where power monitoring, calibration, or energy recycling can be leveraged. It offers similar loss to other N-way structures. To demonstrate the combiners operation, we present completely passive structures and structures with embedded power amplifiers for 4- and 6-way variants. The designs are optimized for operation in the 5-6 GHz unlicensed bands. The passive 4- and 6-way combiners achieve IL of 1.3 and 1 dB, respectively, with associated port isolations of <;-30 dB. The combiners with embedded amplifiers show similar performance and are validated using modulated signals and demonstrate good measured linearity when combining up to 6 amplifiers for output powers >1 W.
Power combiner , Power divider , High power amplifier , Rat-race combiner , Ring-hybrid combiner , Power combiners , Couplers , Power generation , Loading , Insertion loss , Layout , Resistors , Microwave power amplifiers
Holzer, K. D. and Walling, J. S. (2019) '1-to- N ring power combiners with common delta ports', IEEE Transactions on Circuits and Systems I: Regular Papers, 66(4), pp. 1431-1441. doi: 10.1109/TCSI.2018.2886286
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