Electronics Letters · 1991 · 14 citations · 0 references
EngineeringElectrical EngineeringAntennasElectromagneticsMicrowave EngineeringAntenna DesignAntenna Radiation PatternsBroadband AntennasMicrostrip AntennasMicrowave AntennasPlanar AntennasAntenna Impedance BandwidthBandwidthBeamwidthCircular Microstrip AntennasElectromagnetically Coupled AntennasImpedance BandwidthInterlayer CouplingMicrostrip Antenna Bandwidth
The broadband behaviour of a three-layer electromagnetically coupled circular microstrip antenna is investigated experimentally. The effects of interlayer spacings and the thickness of the parasitic layers on the impedance bandwidth, 3 dB beamwidth and pattern shape, are studied. Experiments show that this structure can provide a frequency bandwidth as high as 20% with a low crosspolarisation level and a moderately high gain.