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Dual-mode filter using ring resonator with non-uniform linewidth

Dual-mode filter using ring resonator with non-uniform linewidth

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A dual-mode bandpass filter is proposed using a single ring resonator with non-uniform linewidth. The proposed filter consists of a circular patch with a circular hole and two chip inductors loaded into the gap in the ring. The non-uniform linewidth ring resonator can be realised by moving a circular hole in the circular patch. This asymmetric structure creates a pair of degenerate modes, and thus acts as a dual-mode filter. Two inductors applied to the gap generate one transmission zero on each side of the passband, improving the skirt characteristics of the filter. In addition, a dual-mode filter with the same characteristics is implemented by replacing the chip inductor with a meander line.

References

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      • 3. Huang, Y.-C., Yang, S.-H., Su, L., et al: ‘A narrow band CMOS active dual-mode ring resonator bandstop filter’. Asia Pacific Microwave Conf. Proc. (APMC), Kaohsiung, Taiwan, December 2012, pp. 235237.
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      • 4. Ma, Z., Sasaki, H., Chen, C.-P., et al: ‘Design of a wideband bandpass filter using microstrip parallel-coupled dual-mode ring resonator’. Asia Pacific Microwave Conf. Proc. (APMC), Yokohama, Japan, December 2010, pp. 2124.
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      • 8. Hong, J.S., Lancaster, M.J.: ‘Microstrip filters for RF/microwave applications’ (Wiley, New York, 2001).
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