A Novel Rectangular Waveguide T-Junction for Power Combining Application

In this letter, a novel rectangular waveguide T-junction is proposed for power combining application. In order to achieve good isolation and port matching performances, a metallic strip probe is inserted into the junction through a window at the center of the waveguide side wall to couple even mode energy and a matched load is used to absorb the coupled energy. As it is independent of the junction, match load of high power-handling capability can be used meeting specific application requirements. A Ka-band T-junction prototype is designed and fabricated to validate the design concept. Measured results show that the insertion loss is less than 0.2 dB, the reflection is better than -17 dB and the isolation above 20 dB over the frequency range of 27 to 33 GHz.