15 W power amplifier modules using coaxial waveguide combining by planar probes

Power combining in coaxial waveguide by printed planar probes is investigated. Combiners are designed and implemented at 8–12 GHz and 15–18 GHz. Average introduced insertion loss is measured as 0.5 dB per branch. Power amplifier modules are designed and implemented for both bands. ∼20 W output power at 8–12 GHz and ∼12 W output at 15–18 GHz are achieved by efficient power combining.