Journal
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
Volume 12, Issue 8, Pages 1375-1385Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCPMT.2022.3195768
Keywords
Coaxial substrate integrated waveguide (SIW) resonator; frequency-amplitude independently tunable; tunable bandpass filter (BPF); varactor and graphene
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Funding
- National Natural Science Foundation of China (NSFC) [62071357, 62171348, 61901323, 61771360, U19A2055]
- China Postdoctoral Science Foundation [2020M673342]
- Fundamental Research Funds for the Central Universities [JB210208, XJS200217]
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This article presents a frequency-amplitude independently tunable bandpass filter using an electrically tunable coaxial SIW resonator and graphene. The filter allows independent tuning of frequency and quality factors. The variable capacitance values of the varactor and the bias voltage applied to the graphene enable frequency and amplitude tuning of the filter.
This article presents a frequency-amplitude independently tunable bandpass filter (BPF). The filter uses an electrically tunable coaxial substrate integrated waveguide (SIW) resonator, which has a compact size and a constant fractional bandwidth (FBW). The surface-gap coaxial SIW resonator is loaded with eight varactors and a thin graphene sheet at the top and bottom, respectively, which results in possessing independent tuning characteristics of frequency and quality factors. The variable capacitance values of the varactor are used to achieve frequency reconfigurability, and the graphene located on the bottom surface of the resonator is equivalent to a tunable lumped resistor used to control the Q-factor. In addition, detailed steps of BPF design are provided. For validation, a prototype third-order varactor-graphene-loaded multitunable coaxial SIW BPF is fabricated. The measurements show that within the tunable range of the varactors, the proposed filter can be tuned from 0.68 to 1.03 GHz with 5% +/- 0.2% 1-dB FBW and the insertion loss of passband can be continuously tuned over 2.68-6.37 dB. The frequency tuning and amplitude tuning functions are not dependent on each other. Over the frequency tuning range, the transmission amplitude at an arbitrary center frequency can be dynamically tuned by controlling the bias voltage applied to the graphene.
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