A magnetically switchable ferrite radome for printed antennas
- 1 March 1993
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Microwave and Guided Wave Letters
- Vol. 3 (3) , 67-69
- https://doi.org/10.1109/75.205667
Abstract
A ferrite superstrate or radom layer can be used to control the radiation, reception, and scattering from a printed antenna or array by applying a DC magnetic bias field in the plane of the ferrite, orthogonal to the RF magnetic field. By properly choosing the bias field, the effective permeability of an extraordinary plane wave propagation in the ferrite region can be made to be zero or negative over a certain frequency range, resulting in an evanescent wave behavior in the ferrite layer, and a large attenuation of the wave transmitted through the layer. Similarly, the radar cross section of the antenna will be reduced by twice this attenuation factor. A simple model capable of predicting the gross behavior of the ferrite radome layer is presented, and experimental data are shown to validate the concept.Keywords
This publication has 6 references indexed in Scilit:
- Circularly polarized far fields of an axially magnetized circular ferrite microstrip antennaMicrowave and Optical Technology Letters, 1992
- RCS reduction for a microstrip antenna using a normally biased ferrite substrateIEEE Microwave and Guided Wave Letters, 1992
- Radiation and scattering characteristics of microstrip antennas on normally biased ferrite substratesIEEE Transactions on Antennas and Propagation, 1992
- Magnetic tuning of a microstrip antenna on a ferrite substrateElectronics Letters, 1988
- A Duplexer Using the Zero Permeability Characteristics of Ferrite (Correspondence)IEEE Transactions on Microwave Theory and Techniques, 1961
- A Ferrite Cutoff SwitchIEEE Transactions on Microwave Theory and Techniques, 1959