Abstract
ABSTRACT In this paper, microstrip filters using paired fan-shaped capacitors with controllable transmission zeros are proposed. The paired capacitors are employed to replace the conventional single capacitor to reduce parasitic self-inductance. As a result, the rejection bandwidth and level have both been improved. In the simulated and measured results, several transmission zeros (TZ) have been created in the stopband without any jitters. The frequencies of TZs have been derived in the analysis process using the equivalent circuit. The out-of-band TZs can be controlled flexibly with the component values. The proposed method can be utilized to control the position of out-of-band transmission zeros flexibly to increase figure of merit (FOM) of low-pass filters.
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