A 3-D Miniaturized High Selectivity Bandpass Filter in LTCC Technology

作者：Arabi Eyad^*; Lahti Markku; Vaha Heikkila Tauno; Shamim Atif

来源：IEEE Microwave and Wireless Components Letters, 2014, 24(1): 8-10.

DOI：10.1109/LMWC.2013.2285285

• Bandpass filter (BPF)
• low temperature co-fired ceramic (LTCC)
• system on package (SoP)

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.

• 出版日期2014-1