Vol. 102

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2022-01-02

Bandpass Filter Design with Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure

By Yun Xiu Wang, Wei Chao Yang, and Min Jiang
Progress In Electromagnetics Research Letters, Vol. 102, 19-26, 2022
doi:10.2528/PIERL21110902

Abstract

Novel microstrip single-band and dual-band bandpass filters (BPFs) are presented in this paper. Firstly, a pair of open-ended stubs of less than λ/4 in length is connected to a uniform impedance resonator (UIR) at two symmetrical positions with respect to its centre, and at the same time other two open-circuited stubs with different lengths are loaded in the middle of the resonator. By virtue of parallel-coupling structure at I/O ports, a single-band BPF is constructed centered at 2.2 GHz with 10.6% 3-dB bandwidth, and two transmission zeros are implemented at the right side of the passband. Next, the L-shaped I/O coupled lines are applied to suppress the inherent spurious response of the stubs-loaded resonator. As a result, a dual-band BPF with two passbands at 2.2 GHz and 5.2 GHz, which is self-contained with three transmission zeros between the two passbands, is constituted. Finally, the proposed bandpass filters are designed and fabricated to provide an experimental validation for the predicted performances.

Citation


Yun Xiu Wang, Wei Chao Yang, and Min Jiang, "Bandpass Filter Design with Stub-Loaded Uniform Impedance Resonator and L-Shaped Feed Structure," Progress In Electromagnetics Research Letters, Vol. 102, 19-26, 2022.
doi:10.2528/PIERL21110902
http://jpier.org/PIERL/pier.php?paper=21110902

References