Capacitors in BroadbandCapacitors in Broadband Applications Proper selection of capacitors for RF broadband applications requires careful evaluation of frequency dependent parameters and circuit design requirements By Richard Fiore American Technical Ceramics n today’s rapidly expanding RF and microwave markets, numerous designs must operate over multiple octaves of frequency spectrum. Some of the more common of these include broadband bias networks such as transistor emitter and FET source bypassing, transistor collector and FET drain feed structures, as well as interstage RF coupling, DC blocking and wideband impedance matching. This article will explore various ways to accommodate broadband application L Figure 1. Interstage coupling, 50 MHz to 3.6 GHz. designs with the proper selection of capacitive element……