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A circularly polarized (CP) antenna is proposed, where four metalines are used as radiation elements. This CP antenna supports a negative phase constant current, leading to a small antenna height of approximately 1/100 wavelength. The same antenna characteristics are reproduced even when the feed point position is changed for beam-steering in the azimuth plane, because the metalines are arrayed symmetrically...
This paper discusses an antenna system composed of a fed metaspiral element and two dielectric slabs above the spiral. Analysis reveals that the slabs lead to an increase in the gain, in accordance with the formation of a narrow radiation beam. A gain of 6.5 dBi is obtained, which is 6.5 dB higher than the gain in the absence of the slabs.
This paper presents the radiation characteristics of a low-profile circularly polarized loop antenna that has a left-handed property. The antenna height is set to be small (less than 0.03 wavelength). The gain, axial ratio, radiation efficiency, and VSWR are discussed.
The bi-directional beam from an equiangular spiral antenna (EAS) is changed to a unidirectional beam using an electromagnetic band gap (EBG) reflector. The antenna height, measured from the upper surface of the EBG reflector to the spiral arms, is chosen to be extremely small to realize a low-profile antenna: 0.07 wavelength at the lowest analysis frequency of 3 GHz. The analysis shows that the EAS...
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