LAUSR

In this paper, a novel mixed‐mode filtering hybrid is proposed, which can simultaneously realize bandpass response and equal power division of multiple modes ports. It is composed of five half‐wavelength resonators and an isolated resistor. Good common‐mode (CM) suppression is realized by the intrinsic resonance characteristic of the symmetry‐feeding half‐wavelength resonator. Due to the geometrical symmetry of the filtering hybrid structure, high isolation between the two input ports can be achieved. A resistor is used to enhance isolation between the two output ports. To verify the design concept, a second‐order filtering hybrid prototype operating at 2.45 GHz is fabricated and measured. The measured isolation between the two output ports is over 30 dB and the CM suppression is over 40 dB from 1.0 to 4.8 GHz.