The Design of Embedded Bandpass Filter Used in LTCC Transceiver Module

Abstract

The design of Low-Temperature Co-fired Ceramic (LTCC) multi-layer bandpass filter (BPF) was introduced, which is based on classical design theory of bandpass filter and LTCC technology. A practical computer-aided design process was also presented. The bandpass filter in this paper was used to suppress fundamental and harmonic components of LocalOscillator (LO) signal in LTCC transceiver module. According to full-wave electro-magnetic (EM) comparing simulation, suppressing desire for fundamental and 3rd order harmonic components was satisfied.

The design of LC resonator based bandpass filter embedded in LTCC substrate

“…The next step is the establishment of the relationship between the physical structure and the coupling coefficient According to resonator coupling theory, the coupling coefficient can be determined by the formula below[4],: (8) Where K, is the resonant frequency when a open symmetric plane is added and K 2 is the resonant frequency when a short symmetric plane is added . [5] [6] The coupling coefficient extracted by HFSS using the method above is shown in Fig. 12.…”