A 3-D Miniaturized High Selectivity Bandpass Filter In Ltcc Technology
Microwave and Wireless Components Letters, IEEE (2014)
摘要
Transmission zeros are used to improve the roll-off factors of filters but as a consequence, the out-of-band rejection decreases. In this work, an LTCC filter design is presented which employs a series inductor (implemented as a via hole) to improve the out-of-band rejection by introducing a third transmission zero. The filter, designed for GPS band (1.57 GHz), has one of the smallest reported foot prints ((0.063 x 0.048 x 0.005)lambda(g)) and demonstrates the highest roll off factor (16.7 dB/100 MHz) for this band. With only four LTCC layers, the design is cost effective and thus highly suitable for miniaturized, ultra-thin system-on-package applications.
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关键词
Bandpass filter (BPF),low temperature co-fired ceramic (LTCC),system on package (SoP)
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