Surface mount shunt capacitor filters using bilateral magnetic coupling

This paper proposes shunt capacitor filters using magnetic coupling which improves the filter performance. The proposed filter structure is designed to place input/output paths parallel to shunt path from a power supply line to a ground plane. And magnetic couplings between the input/output paths and shunt path are utilized to reduce parasitic inductance of the shunt path. The proposed filter provides higher performance with almost same area compare with conventional filters. Measurement and EM simulation are used to evaluate the filter performance. As a result, the proposed filters improved the performance by 8 dB at 20 MHz compared with filters without the couplings.