Journal of South China University of Technology (Natural Science Edition) ›› 2007, Vol. 35 ›› Issue (10): 156-161.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

A Novel 2.45 GHz Quasi-Elliptic LTCC Low-Pass Filter

Chu Qing-xin  Liang Qi-xin   

  1. School of Electronic and Information Engineering , South China Univ. of Tech. , Guangzhou 510640 , Guangdong , China
  • Received:2007-03-01 Online:2007-10-25 Published:2007-10-25
  • Contact: 褚庆昕(1958-) ，男，教授，博士生导师，主要从事射频电路与天线研究. E-mail:qxchu@scut. edu.cn
  • About author:褚庆昕(1958-) ，男，教授，博士生导师，主要从事射频电路与天线研究.
  • Supported by:

    国家自然科学基金资助项目(U0635004 )

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Abstract:

This paper presents a novel2. 45 GHz quasi-elliptic low-temperature co-fired ceramic (LTCC) low-pass filter with spiral transmission lines , and proposes the analytical equation to determine an positions of the transmission zeros at the rejection area. By considering the parasitic coupling effect of spiral transmission lines in the actual LTCC structure , the equivalent circuit of the filter is modified , which enables the simulated scattering parameter curves of the equivalent circuit to accord well with the measured ones. It is indicated by measurement that the proposed low-pass filter is of good perfo 口nance and meets the requirements of application well.

Key words: low-temperature co-fired ceramic, spiral transmission line, low-pass filter, quasi-elliptic filter