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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2020-04-27
Compact Balanced Bandpass Filter with High Selectivity Based on Two Coupled Dual-Mode Microstrip Loop Resonators
By
Xiao-Bang Ji,

    Dr. Xiao-Bang Ji

    School of Electrical Engineering

    Henan Polytechnic

    China

    Homepage

Mi Yang

    Dr. Mi Yang

    Department of Electromagnetic Wave and Antenna Propagation

    China Huayin Ordnance Test Center

    China

    Homepage

Progress In Electromagnetics Research Letters, Vol. 90, 143-149, 2020
doi:10.2528/PIERL20011704 | Google Scholar

Abstract
This letter proposes a novel single-layer fourth-order balanced bandpass filter based on two coupled dual-mode loop resonators. Two pairs of balanced input/output (IO) feeding lines with unequal arms are employed to excite the outside dual-mode loop resonator, and the inside dual-mode loop resonator with meander lines is coupled to the outside one. Under differential-mode (DM) operation, three finite transmission zeros (FTZs) can be produced and controlled. Under common mode (CM) operation, the rejection level can be controlled by the length of IO feeding arms. For the demonstration, a balanced dual-mode loop filter with the center frequency of 5.2 GHz is designed, fabricated, and measured. The proposed balanced filter has the advantages of compact size, high selectivity, wide stopband of DM response, and good CM suppression.
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Citation
Xiao-Bang Ji, and Mi Yang, "Compact Balanced Bandpass Filter with High Selectivity Based on Two Coupled Dual-Mode Microstrip Loop Resonators," Progress In Electromagnetics Research Letters, Vol. 90, 143-149, 2020.
doi:10.2528/PIERL20011704
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