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Progress In Electromagnetics Research Letters
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COMPACT BANDSTOP FILTER WITH MULTIPLE REJECTION ZEROS

By G. Yue, X. Wei, B. Fu, S. Yuan, M. Xu, and J. Liao

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Abstract:
This paper presents a compact band stop filter (BSF) based on the dual metal plane configuration with multiple rejection zeros (RZs). Quasi-lumped technique with novel patch-via-spiral dual mode resonator is applied to the design of the proposed filter. Multiple rejection zeros are introduced by open-end stubs for high selectivity. Design equations are obtained by using a lossless transmission line model. The calculated results show that the lower and upper rejection zeros can be easily tuned by the coupling capacitor and the open-end stubs respectively. By using the Microstrip-Coplanar-Waveguide (CPW) structure, the size of the proposed filter can be reduced to 12.8 mm x 9 mm(i.e., 0.24λg x 0.17λg), where λg denotes the guided wavelength at center frequency.

Citation:
G. Yue, X. Wei, B. Fu, S. Yuan, M. Xu, and J. Liao, "Compact Bandstop Filter with Multiple Rejection Zeros," Progress In Electromagnetics Research Letters, Vol. 37, 55-64, 2013.
doi:10.2528/PIERL12112701

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