Abstract
In this paper, a compact three-order mixed-cross coupled bandpass fllter (BPF) with enhanced frequency selectivity is proposed. Multiple transmission zeros (TZs) can be obtained near the passband for high frequency selectivity by introducing mixed-cross coupling between the nonadjacent resonators. The frequency-dependent mixed- cross coupling matrix of the proposed fllter is presented to explain the occurrence of the TZs caused by mixed-cross coupling. A new BPF centered at 2.7GHz with 11.5% fractional bandwidth has been designed and fabricated to verify the validity of the proposed method. The measurement result shows four flnite TZs in the stopband, located at 1.74GHz with 52.16dB rejection, 2.53GHz with 24.67dB rejection, 3.83GHz with 47.52dB rejection, and 7.75GHz with 54.83dB rejection, respectively. The circuit only occupies 6.2£7.6mm 2 .
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