Summary
International Conference on Emerging Technologies for Communications
2022
Session Number:O5
Session:
Number:O5-1
An ESL-cancelling circuit for a film capacitor using vertically stacked coupled square loops
Satoshi Yoneda, Akihito Kobayashi, Norihiko Akashi, Eiji Taniguchi,
pp.-
Publication Date:2022/11/29
Online ISSN:2188-5079
Summary:
An ESL-cancelling circuit for a film capacitor using vertically stacked coupled square loops is reported in this paper. The circuit is applicable for shunt-connected capacitors whose equivalent series inductance (ESL) causes deterioration of filter performance at frequencies above the self-resonant frequency. Two pairs of magnetically coupled vertically stacked loops are used in the circuit those can equivalently generate negative inductance in the shunt path to cancel the ESL and improve filter performance. The ESL-cancelling circuit for a 1-μF film capacitor was designed according to Biot-Savart law and EM-analysis, then was fabricated with an FR4 substrate. The measured result showed that filter performance was improved by more than 20-dB at the frequencies above the self-resonant frequency. Sdd21 less than -40 dB at 1 MHz to 100 MHz was also achieved which is, in principle, difficult to realize with any kind of single bulky shunt-connected capacitor.