Compact 60-GHz On-Chip Bandpass Filter With Low Insertion Loss

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In this letter, a compact 60-GHz on-chip bandpass filter is presented using an integrated passive devices technology on a GaAs substrate. An E-shaped dual-mode resonator and stepped impedance resonator were adopted in this design for a compact size and sharp cut-off response. Two controllable transmission zeros are obtained on the both sides of the passband achieving a good frequency selectivity. The main size of the filter is only $0.58 \times 0.4$ mm2. The presented filter has a center frequency of 60 GHz, with a 3 dB fractional bandwidth of 14.8 GHz from 52.6 to 67.4 GHz. The insertion loss of the filter is only 1.2 dB, and the return loss is lower than −10 dB within the passband. Good agreement is achieved between the measured results and the simulated ones.