Dual-passband bandpass-filtering power divider using half-mode substrate integrated waveguide resonator with high frequency selectivity

In this paper, a half-mode substrate integrated waveguide (HMSIW) power divider with bandpass response and good frequency selectivity is proposed. The proposed power divider includes input/output microstrip lines, four HMSIW resonators, cross-coupling circuits, and an isolation resistor. The dual-band bandpass-filtering response is obtained by using the dual-mode slotted HMSIW. To get good frequency selectivity, the input/output cross-coupling circuits have been used, and several transmission zeros can be observed. A dual-band filtering-response HMSIW power divider is designed, fabricated and measured. The total size of the fabricated power divider is 0.58 lambda g x 0.45 lambda g. The measured results show a reasonable agreement with the simulated ones. The measured central operating frequencies of the dual-band HMSIW power divider are at 2.43 and 3.50 GHz, respectively. The measured 3-dB fractional bandwidth is about 13.3% and 6.3% in the two passbands, and the measured output isolation is about 20 dB.