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In this letter, a miniaturized bandpass filter chip is designed and implemented on high-resistivity-silicon (HRS) integrated passive device (IPD) technology. The filter is designed into a three-path topology, which can generate multiple transmission zeros to achieve a high roll-off rate at the passband edge and good rejection in a very wide stopband. For validation, the filter chip operating at 5G N77 frequency band is fabricated with a compact size of 1. 10. 7 mm2 on IPD technology. Measured results show an in-band insertion loss of smaller than 1. 7 dB and a wide stopband from 5. 39 to 31. 5 GHz.
Zhang et al. (2024) studied this question.