Nonreciprocal tunable waveguide directional filter using a turnstile open gyromagnetic resonator

Joseph Helszajn, C. S. Cheng, B. A. Wilcock

Research output: Contribution to journalArticle

Abstract

The 4-port waveguide directional filter is a classic network in microwave engineering. The purpose of this paper is to describe one gyromagnetic version using an open gyromagnetic resonator in a dielectric-filled cavity. A property of the circuit is that it behaves as a 4-port circulator with one direction of circulation at one split frequency of the resonator and with the other direction for the other split frequency. An insertion loss between the coupled ports below 1.50 dB and an attenuation or isolation of typically 15dB between the decoupled ports over most of the tuning range of the filter have been achieved. Its 3-dB bandwidth is typically 65 MHz. A typical tuning range of more than 1 GHz centered at about 10.5 GHz has been separately realized for each split branch.

Original languageEnglish
Pages (from-to)1950-1958
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume41
Issue number11
DOIs
Publication statusPublished - Nov 1993

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