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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2021-06-10
A Dual Bandpass Filter Design Using Strong Coupling, Evanescent Mode and Modular Concept
By
Sek-Meng Sow,

    Dr. Sek-Meng Sow

    National University of Singapore

    Singapore

    Homepage

Peng Tan,

    Dr. Peng Tan

    National University of Singapore

    Singapore 119260

    Homepage

Jian Lu

    Dr. Jian Lu

    National University of Singapore

    Singapore

    Homepage

Progress In Electromagnetics Research C, Vol. 113, 83-96, 2021
doi:10.2528/PIERC21032507 | Google Scholar

Abstract
This paper presents a new design concept of dual bandpass filter. Based on the strong coupling between two resonators, a dual 1-pole band-pass filter is designed and is used as the basic building block. By providing appropriate weak coupling between these building blocks, a higher-order dual bandpass filter can be realized. In addition, these building blocks can be stacked vertically and/or horizontally to construct a compact filter. In this way, by using 3D full wave EM and circuit co-simulation, the simulation time required in the design stage can be reduced. In addition, it also provides a way to post-tune each building block individually and further reduces the time required in prototype post tuning process. For demonstration, an L-band dual 4-pole bandpass filter is designed with passband frequencies of 1.23 GHz~1.255 GHz and 1.55 GHz~1.6 GHz. In order to reduce the size of the filter and obtain a wide stopband bandwidth, a suitable evanescent mode cavity is used to realize the resonant structure. The measurement result shows that the insertion losses of the low passband and high passband are 1.03 dB~2.00 dB and 1.02 dB~1.75 dB, respectively; the return loss of both passbands is better than 15 dB. Furthermore, up to 5 GHz (> 3fo, where fo is at 1.39 GHz), the stopband rejection level is better than 80 dB.
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Citation
Sek-Meng Sow, Peng Tan, and Jian Lu, "A Dual Bandpass Filter Design Using Strong Coupling, Evanescent Mode and Modular Concept," Progress In Electromagnetics Research C, Vol. 113, 83-96, 2021.
doi:10.2528/PIERC21032507
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