volume | PIER Journals

2013-05-29

A Novel Wideband Bandpass Filter Using Triple-Mode Slotline Ring Resonator

Bo Jiang,

Dr. Bo Jiang

School of Electrical and Electronic Engineering

Nanyang Technological University

Singapore

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Lei Zhu,

Professor Lei Zhu

Nanyang Technological University

Singapore

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Dong Chen

Professor Dong Chen

School of Electronic Science and Engineering

Nanjing University of Posts and Telecommunications

China

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Progress In Electromagnetics Research Letters, Vol. 40, 163-170, 2013

doi:10.2528/PIERL13040104

Abstract

A novel wideband bandpass filter on a triple-mode slotline ring resonator is proposed in this letter. By attaching two stubs with different lengths and/or widths to the symmetric plane of a slotline ring resonator, the frequencies of first three resonant modes can be rearranged towards quasi-equal separation. By feeding this slotline resonator using the microstrip feed lines at positions with an angle of 90° to the symmetrical plane, these three resonant modes can be simultaneously raised up, aiming to form up a wide passband. Meanwhile, a wide upper-stopband can be realized by setting the lengths of two stubs unequally. After the principle of an initial wideband filter is described, a prototype of compact filter with internally-loaded stubs is designed with fractional bandwidth of 66% at center frequency of 3.0 GHz. Measured results well validate the predicted ones.

Citation

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Bo Jiang, Lei Zhu, and Dong Chen, "A Novel Wideband Bandpass Filter Using Triple-Mode Slotline Ring Resonator," Progress In Electromagnetics Research Letters, Vol. 40, 163-170, 2013.
doi:10.2528/PIERL13040104

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