Tunable Bandpass Filter with Two Transmission Zeros

DOI

10.2991/cecs-18.2018.6How to use a DOI?

Keywords

Tunable filter, dual-mode resonator, bandpass filter, even-odd mode.

Abstract

In this paper, a novel varactor-tuned microstrip bandpass filter consisting of two dual-mode open loop resonators was proposed. The two open loop resonators are placed diagonally to prevent the occurrence of resonance between them. No coupling exists between the operating odd-mode and even-mode. Based on this feature, we use a simple DC bias circuit to tune the odd and even mode frequency of the resonator respectively to realize tunable passband frequency. The results show that two transmission zeros are produced at the edge of each passband, which greatly improves the frequency selectivity of the filter. This filter is tuned from 0.87 GHz to 1.03 GHz with return loss more than 20dB with nearly constant frequency response.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Zhongyin Xiao
AU  - Xiyang Xu
PY  - 2018/07
DA  - 2018/07
TI  - Tunable Bandpass Filter with Two Transmission Zeros
BT  - Proceedings of the 2018 International Symposium on Communication Engineering & Computer Science (CECS 2018)
PB  - Atlantis Press
SP  - 25
EP  - 29
SN  - 2352-538X
UR  - https://doi.org/10.2991/cecs-18.2018.6
DO  - 10.2991/cecs-18.2018.6
ID  - Xiao2018/07
ER  -