X-band broadband substrate integrated rectangular waveguide power divider

A novel broadband substrate integrated rectangular waveguide (SIRW) power divider is presented. Based on the equivalent-circuit method, broadband impedance matching about the current probe circuit has been achieved. A four-way SIRW power divider operating at X-band has been designed, fabricated and measured. Good agreement between simulated and measured results is found. The measured 15 dB return loss bandwidth is demonstrated to be about 40%, and its 1 dB insertion loss bandwidth is 4.2 GHz. This broadband SIRW power divider can be used widely in microwave and millimetre-wave circuits and system.