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Design of multi-layered bandpass filter with independently controllable triple-passband response

Published online by Cambridge University Press:  29 January 2014

Yung-Wei Chen ,
Hung-Wei Wu  and
Yan-Kuin Su
Yung-Wei Chen
Affiliation:
Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Institute of Microelectronics, National Cheng Kung University, Tainan, Taiwan
Hung-Wei Wu*
Affiliation:
Department of Computer and Communication, Kun Shan University, Tainan, Taiwan. Phone: +886-6-2051237
Yan-Kuin Su
Affiliation:
Department of Electrical Engineering, Advanced Optoelectronic Technology Center, Institute of Microelectronics, National Cheng Kung University, Tainan, Taiwan Department of Electrical Engineering, Kun-Shan University, Tainan, Taiwan
*
Corresponding author: H.-W. Wu Email: hwwu@mail.ksu.edu.tw
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Abstract

In this paper, a new multi-layered triple-passband bandpass filter using embedded and stub-loaded stepped impedance resonators (SIRs) is proposed. The filter is designed to have triple-passband at 1.8, 2.4, and 3.5 GHz. The 1st and 2nd passbands (1.8/2.4 GHz) are simultaneously generated by controlling the impedance and length ratios of the embedded SIRs (on top layer). The 3rd passband (3.5 GHz) is generated by using the stub-loaded SIR (on bottom layer). Using the embedded SIR, the even modes can be tuned within very wide frequency range and without affecting the odd modes. Therefore, the design of multi-band filters with very close passbands can be easily achieved and having a high isolation between the passbands. The filter can provide the multi-path propagation to enhance the frequency response and achieving the compact circuit size. The measured results are in good agreement with the full-wave electromagnetic simulation results.

Keywords

Triple-passbandBandpass filterStepped impedance resonatorMulti-layerStub-loaded
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 6 , Special Issue 6: Mediterranean Microwave Symposium 2013 , December 2014 , pp. 611 - 618
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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