UHF band semi-lumped active notch filter

• Published in: 2010 Asia-Pacific Microwave Conference pp. 841 - 844
• Main Authors: Tong, D L H, Le Naour, J.-Y, Robert, J.-L, Louzir, A
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.12.2010
• Subjects: active filter; Band pass filters; Band reject; bipolar transistor; Capacitance; Insertion loss; Low pass filters; Microwave filters; negative resistance; notch filter; Resonator filters; semi-lumped circuit; UHF band
• ISBN: 9781424475902; 1424475902
• ISSN: 2165-4727

This paper presents a novel semi-lumped active notch filter that has been designed under high constraints of cost, performance and size. The filter comprises lumped elements, interconnecting transmission lines and an active capacitance circuit. The aim of this work is to reduce at the same time the filter size and the insertion loss, while keeping a high notch depth. The proposed concept is applied to the design of a filter in the upper UHF band, using a very low-cost FR4-based substrate.