Highly Compact Dual-Band Lumped Element Band-pass Filters in LTCC for Avionic Systems

The Dual Band Pass Filters (DBPF) with high stop band rejection at center frequencies of 122 and 330 MHz are designed. The DBPF filters are fabricated in low temperature co-fired ceramic (LTCC) technology using a lumped element approach. Measured results show close agreement with simulations with very small form factor. The overall size of the dual band-pass filter is 32 mm×18 mm×2.2 mm.