Open AccessSCATTERING MATRIX AND EQUIVALENT CIRCUIT OF AN X-BAND RECTANGULAR WAVEGUIDE CONTAINING FERRITE POSTS
Author(s) -
Hu Pei-Kaung
Publication year - 1966
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.22.1069
Subject(s) - susceptance , ferrite (magnet) , materials science , scattering , equivalent circuit , electronic circuit , electrical impedance , waveguide , microwave , optics , physics , optoelectronics , telecommunications , voltage , composite material , computer science , quantum mechanics
This paper is intended to describe the properties of nonreciprocal microwave ferrite devices from the four-terminal network analysis. First, the impedance and the scattering matrix of an X-band rectangular waveguide containing a transversely magnetized ferrite post are measured as a function of the (1) diameter of the post, (2) position of the post in the waveguide, and (3) applied d. c. magnetic field. Then, the T-equivalent circuits are obtained from the scattering matrix measurements. Results prove that when a thin ferrite post is placed near a side wall of the guide, it acts essentially as a shunting capacitance. The susceptance decreases with d. c. mangetic field. As far as the impedance is concerned, the post itself behaves like a tuning screw. Finally, the equivalent circuit of a waveguide containing two or more ferrite posts is studied. It is found that when the distance between the two nearest posts is greater then λ/2, the equivalent circuit is simply the "single post" circuits connected in cascade. A phase shift network is used to illustrate the application of the principle of the circuit analysis.