A Novel Miniaturized Balanced Bandpass Filter Chip Using Lumped-element Based on IPD Technology

In this paper, a novel miniaturized balanced band-pass filter (BPF) chip using lumped-element is proposed. First, the balanced BPF is analyzed by using transformation formulas between ABCD matrix and Sparameters. The filter chip is designed and fabricated based on integrated passive device (IPD) technology. Finally, measured results show that differential-mode (DM) return loss is higher than 10.5 dB, DM insertion loss in band ranges from 2.453 to 2.813 dB and common-mode (CM) suppression from 0 to 6.5 GHz is better than 21 dB. The size of the filter based on IPD technology is only
$1.015 \times 1.170\text{mm}^{2}$
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