NDLI: Radiation from Ferrite-Filled Apertures

Content Provider	IEEE Xplore Digital Library
Author	Angelakos, D.J. Korman, M.M.
Copyright Year	1931
Abstract	The properties of ferrites at microwave may be used in antennas to produce some interesting effects. A rectangular waveguide termininating in the plane of an infinite ground screen and radiating into a half space has a ferrite slab located at the aperture. With a TE10 mode of 9365 mc sent through the waveguide the far-zone radiation pattern in the H plane has been measured as a function of a transversely applied static magnetic field. It was discovered that for certain thicknesses of the ferrite slab the radiation lobe deviated considerably from the normal to the infinite screen with only small changes in the applied magnetic field. For some of these resonance points and their neighborhoods more detailed investigations were carried out in order to determine: a) the amplitude and phase distributions of the electric field in the aperture; b) reciprocity relationships. Small holes backed with a ferrite slab also exhibit a pattern shift with applied magnetic field. When an axial magnetic field is applied to a ferrite rod protruding from an open circular guide, the radiation pattern of the rod antenna may be shifted considerably. This effect has cylindrical symmetry.
Starting Page	1463
Ending Page	1468
Page Count	6
File Size	1768055
File Format	PDF
ISSN	00968390
Volume Number	44
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1956-10-01
Access Restriction	Subscribed
Rights Holder	The Institute of Radio Engineers, Inc. (IRE)
Subject Keyword	Apertures Ferrites Slabs Magnetic field measurement Planar waveguides Antenna radiation patterns Magnetic fields Microwave antennas Rectangular waveguides Magnetic resonance
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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