A circular-electric hybrid junction and some channel-dropping filters

TLDR: In this article, a TE 01 ° hybrid junction that operates similarly to the Riblet short-slot hybrid is described, but because the modes involved are circular-electric, the hybrid can be telescopically mounted, allowing for adjustment to almost any power division.

Abstract: A TE 01 ° hybrid junction that operates similarly to the Riblet short-slot hybrid is described, but because the modes involved are circular-electric, the hybrid can be telescopically mounted, allowing for adjustment to almost any power division. The experimental results show that, centered at 55.6 kmc, the frequency range is larger than 20 per cent. Adjusted for equal power division, the balance is better than 0.5 db and the unwanted reflections in the driven and balanced (isolation) arms are at least 23 db below the input signal. Using the hybrid together with band-reflection, band-transmission or high-pass filters, it is possible to build low-loss channel-dropping filters. In particular, the use of simple cutoff waveguides permits the design of filters with almost rectangular transfer characteristics.