Title :
A Broadband Single-Stage Equivalent Circuit for Modeling LTCC Bandpass Filters
Author :
Tsai, Yu-Shun ; Horng, Tzyy-Sheng
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung
Abstract :
A single-stage equivalent circuit is proposed to model microwave bandpass filters (BPFs) fabricated in low-temperature co-fired ceramic (LTCC) technology up to several times its passband frequency. The equivalent circuit adopts a modified T topology with the expandable multilayer resonators to achieve an extremely large bandwidth. It can be efficiently established from the measured S-parameters using direct extraction or rational approximation. As a result, the modeled S-parameters for a 2.45-GHz wideband local area network (WLAN) LTCC BPF show good agreement with the measured results over a wide frequency range up to 8.5 GHz. Such a broadband model can be used to accurately predict the suppression of harmonics and interferences in system simulation of the WLAN front-end modules
Keywords :
S-parameters; band-pass filters; broadband networks; ceramics; equivalent circuits; harmonics suppression; interference suppression; microwave filters; wireless LAN; 2.45 GHz; LTCC; S-parameters measurement; WLAN front-end modules; equivalent-circuit model; expandable multilayer resonators; harmonics suppression; interferences suppression; low-temperature co-fired ceramic technology; microwave bandpass filters; modified T topology; wideband local area network; Band pass filters; Ceramics; Equivalent circuits; Frequency; Microwave technology; Network topology; Passband; Predictive models; Scattering parameters; Wireless LAN; Equivalent-circuit model; low-temperature co-fired ceramic (LTCC) bandpass filter (BPF); wideband local area network (WLAN) BPF;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.883603
