Title :
Analysis of Second-Order LTCC Bandpass Filter with Two Finite Transmission Zeros
Author :
Zong, Zhi-Feng ; Qin, Ya-Li ; Zhu, Fu-Liang ; Zhao, Yu-Jie
Author_Institution :
Inst. of Fiber-Opt. Commun. & Inf. Eng., Zhejiang Univ. of Technol., Hangzhou
Abstract :
The paper proposes a new Low-temperature co-fired ceramic (LTCC) bandpass filter, which can be used to provide two finite transmission zeros in the lower stopband. The coupled electromagnet of the two stepped-impedance resonators (SIRs) is improved by adding a coupling pad. A feedback capacitor between input and output is also used to realize transmission zero. An equivalent lumped circuit is derived to explain the behaviors of the two finite transmission zeros .This filter operates at 2.45 GHz and has a compact size of 2.5 mm times 2.0 mm times 0.9 mm,which is widely used in Bluetooth wireless LAN transceiver system.
Keywords :
Bluetooth; band-pass filters; capacitors; transceivers; wireless LAN; Bluetooth; coupled electromagnet; coupling pad; feedback capacitor; finite transmission zeros; low-temperature co-fired ceramic; second-order LTCC bandpass filter; stepped-impedance resonators; wireless LAN transceiver system; Band pass filters; Bluetooth; Capacitors; Ceramics; Coupling circuits; Electromagnetic coupling; Electromagnets; Filtering theory; Output feedback; Resonator filters;
Conference_Titel :
Millimeter Waves, 2008. GSMM 2008. Global Symposium on
Conference_Location :
Nanjing
Print_ISBN :
978-1-4244-1885-5
Electronic_ISBN :
978-1-4244-1886-2
DOI :
10.1109/GSMM.2008.4534550
