Design of an 8-way 20kW Co-axial Radial Power Combiner for High Power S-band Applications

This paper presents the design and development of an 8-way 20kW co-axial radial power combiner (RPC) for high power S-band applications. The proposed 8-way in-phase RPC achieves a measured return loss better than 15 dB. The measured amplitude imbalance and phase imbalance are within +/- 0.25 dB and +/- 6 degrees respectively. The proposed RPC is capable of providing power of 20 kW at the combined port. The EM and thermal simulations are carried out to the validate the electrical and thermal performance of the RPC. The average power combining efficiency is better than 90% over the entire band of operation.