Electronics Letters · 1994 · 25 citations · 5 references
EngineeringElectrical EngineeringAntennasElectromagneticsMicrowave EngineeringAntenna DesignAntenna RadiationFerrimagnetic MaterialsMicrostrip AntennasMicrowave AntennasPlanar AntennasAnnular Ring Microstrip AntennasCircular PolarizationCircularly Polarized AntennasCircularly Polarized Microstrip AntennasMicrostrip Antenna DesignMicrostrip Patch AntennasPatch AntennasPrinted Antennas
Properties of annular ring microstrip antennas printed on magnetically biased ferrite substrates are reported. Experimental results for the fundamental TM11 mode and a higher-order TM21 mode are described. Circular polarisation is generated using a single electromagnetically coupled feed for both modes. The resonance frequency can be tuned over a 15% range using a magnetic bias normal to the patch and ferrite.
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