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Progress In Electromagnetics Research Letters
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A NOVEL WIDEBAND BANDPASS FILTER USING TRIPLE-MODE SLOTLINE RING RESONATOR

By B. Jiang, L. Zhu, and D. Chen

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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:
B. Jiang, L. Zhu, and D. 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
http://www.jpier.org/pierl/pier.php?paper=13040104

References:
1. Chang, K., Microwave Ring Circuits and Antennas, Wiley, New York, 1996.

2. Wolff, I., "Microstripbandpass filter using degenerate modes of a microstrip ring resonator," Electron. Lett., Vol. 8, No. 12, 302-303, 1972.
doi:10.1049/el:19720223

3. Matsuo, M., H. Yabukiand, and M. Makimoto, "Dual-mode stepped-impedance ring resonator for bandpass filter applications," IEEE Trans. on Microw. Theory and Tech., Vol. 49, No. 7, 1235-1240, 2001.
doi:10.1109/22.932241

4. Gorur, A., "Description of coupling between degenerate modes of a dual-mode microstrip loop resonator using a novel perturbation arrangement and its dual-mode bandpass filter applications," IEEE Trans. on Microw. Theory and Tech., Vol. 52, No. 2, 671-677, 2004.
doi:10.1109/TMTT.2003.822033

5. Chen, Z.-X., X.-W. Dai, and C.-H. Liang, "Novel dual-mode dual-band bandpass filter using double square-loop structure," Progress In Electromagnetics Research, Vol. 77, 409-416, 2007.
doi:10.2528/PIER07082803

6. Hong, J. S. and M. J. Lancaster, "Microstrip bandpass filter using degenerate modes of a novel meander loop resonator," IEEE Microw. Guided Wave Lett., Vol. 5, No. 11, 371-372, 1995.
doi:10.1109/75.473539

7. Luo, S., L. Zhu, and S. Sun, "A dual-band ring-resonator bandpass filter based on two pairs of degenerate modes," IEEE Trans. on Microw. Theory and Tech., Vol. 58, No. 12, 3427-3432, 2010.

8. Hsieh, L. H. and K. Chang, "Compact, low insertion-loss, sharp-rejection, and wide-band microstrip bandpass filters," IEEE Trans. on Microw. Theory and Tech., Vol. 51, No. 4, 1241-1246, 2003.
doi:10.1109/TMTT.2003.809643

9. Ishida, H. and K. Araki, "Design and analysis of UWB bandpass filter with ring filter," IEEE MTT-S Int. Dig., Vol. 3, 1307-1310, 2004.

10. Luo, S. and L. Zhu, "A dual-mode dual-band bandpass filter using a single slot ring resonator," Progress In Electromagnetics Research Letter, Vol. 23, 173-180, 2011.

11. Sun, S. and L. Zhu, "Wideband microstrip ring resonator bandpass filters undermultiple resonances," IEEE Trans. on Microw. Theory and Tech., Vol. 55, No. 10, 2176-2182, 2007.
doi:10.1109/TMTT.2007.906510


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