IEEE Microwave and Wireless Components Letters · 2005 · 98 citations · 14 references
EngineeringElectrical EngineeringAntennasMicrowave EngineeringWireless CommunicationsAntenna BandwidthAntenna DesignAntenna RadiationBroadband AntennasMicrowave AntennasSmall AntennasAntenna Bandwidth EnhancementAntenna Impedance BandwidthBandwidthBroadband Antenna DesignDielectric Resonator AntennasRadiation PatternsResonant FrequencyResonant Frequency Tuning
Bandwidths of the coaxial fed and aperture coupled cylindrical dielectric resonator antennas (DRAs) with broadside radiation patterns are enhanced by exciting the HEM/sub 11/spl Delta// (1</spl Delta/<2) mode at a frequency close to the HEM/sub 11/spl delta// (0</spl delta/<1) mode. Both HEM/sub 11/spl delta// and HEM/sub 11/spl Delta// modes have similar broadside radiation patterns. Measured impedance bandwidths as much as 26.8% (S/sub 11/<-10 dB) are achieved for the coaxial fed DRA and 23.7% for the aperture coupled DRA. These bandwidths are comparable to those obtained using stacked DRAs. The resonant frequency of the HEM/sub 11/spl Delta// mode can be adjusted by the radius (r) to height (h) ratio of the cylindrical DRA. A wide bandwidth is obtained when this ratio equals to 0.329.
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