A highly effective deflecting structure

Abstract

A structure is presented that combines high transverse shunt impedance (~500 M Omega/m at 500 MHz) with outside dimensions that are small in relation to the desired mode's resonant frequency. The basic idea was to find a practical way to resonate a small gap, two conductor, lambda/4 transmission line with a field pattern that is locally very close to a TEM dipole mode (apart from important and essential modifications at the gap end). Two possible applications stand out: use as an RF separator (discussed here) or use as a high sensitivity microwave beam position monitor.