Miniaturized Dual-Mode Ring Bandpass Filters With Patterned Ground Plane |
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Authors: | Rui-Jie Mao Xiao-Hong Tang Fei Xiao |
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Affiliation: | Univ. of Electron. Sci. & Technol. of China, Chengdu; |
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Abstract: | Miniaturized dual-mode ring bandpass filters with a patterned ground plane are proposed. By loading the resonator periodically with the butterfly radial slot cells on the ground plane, the size of a ring filter is reduced along with an extended upper stopband. Based on the equivalent circuits, the mode-splitting characteristics and impact of the patterned ground plane on the electrical performances of the filter are investigated. A slotline ring filter with a patterned ground plane is also proposed. The miniaturization is achieved by loading the periphery of the slotline ring with the butterfly radial stubs at the backside. The filter has a higher first spurious response and deeper stopband rejection than a conventional microstrip ring filter. Measured results validate the analysis and theoretical prediction with good agreement. |
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