Side-Coupled Microstrip Open-Loop Resonator for Harmonic-Suppressed Bandpass Filters

Hang WANG; Lei ZHU

doi:10.1093/ietele/e88-c.9.1893

Side-Coupled Microstrip Open-Loop Resonator for Harmonic-Suppressed Bandpass Filters

Hang WANG, Lei ZHU

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A side-coupled microstrip open-loop resonator is presented for design of harmonic-suppressed bandpass filters with compact size. In geometry, the open-ended microstrip feed line is put in close proximity to the loop resonator at the opposite side of an opened-gap. In design, its length is properly lengthened to establish the orthogonal even- and odd-symmetrical current distributions along the two coupled strip conductors. It thus results in cancellation the 1st parasitic resonance. The two-stage open-loop filter is first constructed and its performance is studied under varied feed line lengths. Furthermore, a four-stage filter block is optimally designed at 2.52 GHz and its circuit sample is fabricated with the overall length less than 60% of one guided wavelength. The measured insertion loss at the 1st harmonic is higher than 30 dB, the stopband covers the range from 2.8 GHz to 7.0 GHz, and the dominant pass bandwidth is about 9.0%.

Publication: IEICE TRANSACTIONS on Electronics Vol.E88-C No.9 pp.1893-1895

Publication Date: 2005/09/01

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DOI: 10.1093/ietele/e88-c.9.1893

Type of Manuscript: LETTER

Category: Microwaves, Millimeter-Waves

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Hang WANG, Lei ZHU, "Side-Coupled Microstrip Open-Loop Resonator for Harmonic-Suppressed Bandpass Filters" in IEICE TRANSACTIONS on Electronics, vol. E88-C, no. 9, pp. 1893-1895, September 2005, doi: 10.1093/ietele/e88-c.9.1893.
Abstract: A side-coupled microstrip open-loop resonator is presented for design of harmonic-suppressed bandpass filters with compact size. In geometry, the open-ended microstrip feed line is put in close proximity to the loop resonator at the opposite side of an opened-gap. In design, its length is properly lengthened to establish the orthogonal even- and odd-symmetrical current distributions along the two coupled strip conductors. It thus results in cancellation the 1st parasitic resonance. The two-stage open-loop filter is first constructed and its performance is studied under varied feed line lengths. Furthermore, a four-stage filter block is optimally designed at 2.52 GHz and its circuit sample is fabricated with the overall length less than 60% of one guided wavelength. The measured insertion loss at the 1st harmonic is higher than 30 dB, the stopband covers the range from 2.8 GHz to 7.0 GHz, and the dominant pass bandwidth is about 9.0%.
URL: https://global.ieice.org/en_transactions/electronics/10.1093/ietele/e88-c.9.1893/_p

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@ARTICLE{e88-c_9_1893,
author={Hang WANG, Lei ZHU, },
journal={IEICE TRANSACTIONS on Electronics},
title={Side-Coupled Microstrip Open-Loop Resonator for Harmonic-Suppressed Bandpass Filters},
year={2005},
volume={E88-C},
number={9},
pages={1893-1895},
abstract={A side-coupled microstrip open-loop resonator is presented for design of harmonic-suppressed bandpass filters with compact size. In geometry, the open-ended microstrip feed line is put in close proximity to the loop resonator at the opposite side of an opened-gap. In design, its length is properly lengthened to establish the orthogonal even- and odd-symmetrical current distributions along the two coupled strip conductors. It thus results in cancellation the 1st parasitic resonance. The two-stage open-loop filter is first constructed and its performance is studied under varied feed line lengths. Furthermore, a four-stage filter block is optimally designed at 2.52 GHz and its circuit sample is fabricated with the overall length less than 60% of one guided wavelength. The measured insertion loss at the 1st harmonic is higher than 30 dB, the stopband covers the range from 2.8 GHz to 7.0 GHz, and the dominant pass bandwidth is about 9.0%.},
keywords={},
doi={10.1093/ietele/e88-c.9.1893},
ISSN={},
month={September},}

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TY - JOUR
TI - Side-Coupled Microstrip Open-Loop Resonator for Harmonic-Suppressed Bandpass Filters
T2 - IEICE TRANSACTIONS on Electronics
SP - 1893
EP - 1895
AU - Hang WANG
AU - Lei ZHU
PY - 2005
DO - 10.1093/ietele/e88-c.9.1893
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E88-C
IS - 9
JA - IEICE TRANSACTIONS on Electronics
Y1 - September 2005
AB - A side-coupled microstrip open-loop resonator is presented for design of harmonic-suppressed bandpass filters with compact size. In geometry, the open-ended microstrip feed line is put in close proximity to the loop resonator at the opposite side of an opened-gap. In design, its length is properly lengthened to establish the orthogonal even- and odd-symmetrical current distributions along the two coupled strip conductors. It thus results in cancellation the 1st parasitic resonance. The two-stage open-loop filter is first constructed and its performance is studied under varied feed line lengths. Furthermore, a four-stage filter block is optimally designed at 2.52 GHz and its circuit sample is fabricated with the overall length less than 60% of one guided wavelength. The measured insertion loss at the 1st harmonic is higher than 30 dB, the stopband covers the range from 2.8 GHz to 7.0 GHz, and the dominant pass bandwidth is about 9.0%.
ER -