Wideband out-of-phase SIW power divider with enhanced stopband

A wideband multi-way out-of-phase substrate integrated waveguide (SIW) power divider with improved rejection band by using novel hybrid multiple-via probe and multiple radial slots has been presented in this letter. The novel hybrid multiple-via probe and multiple radial slots are employed to achieve wideband and improved rejection band respectively. An eight-way out-of-phase SIW power divider is designed, fabricated, and measured. Good agreement between simulated and measured results is obtained in the desirable frequency range. The measured average insertion loss of the eight-way power divider is approximately 9.3 dB and return loss is greater than 15 dB from 3.5 GHz to 8 GHz, as well as an rejection band with more than 25 dB attenuation from 9 GHz to 11.2 GHz. A maximum amplitude imbalance of ±0.3 dB and phase imbalance of ±3° are observed over the entire operating frequency range.