Abstract
We present a kind of large area subwavelength cavity antenna with artificial permeability-negative metamaterials at GHz range. The antenna has the advantages of flatness, ultra-thin thickness, high gain and good directivity. The optimal receiving area of the antenna is mainly determined by the size of the radiation source. Its directivity and sidelobe cancellation mainly depend on the patterns of the patch array as the radiation source. It is found that the antenna with non-uniform distributed patch array as the radiation source has better performance than that with uniform distributed patch array patterns. Otherwise, this type of metamaterial antenna has nearly the same performance compared to that of parabolic antenna with equal radiation aperture, so it has potential applications to replace the traditional large aperture parabolic antenna.
Highlights
Antennas are the necessary components in the modern wireless systems
We present the performance of the subwavelength cavity antenna on mu-negative metamaterials (MNMs) with a single metallic patch as the radiation source
We investigate a kind of subwavelength cavity antennas using MNMs within GHz range
Summary
Antennas are the necessary components in the modern wireless systems. An antenna converts electric currents and voltages created by a transmitter to electromagnetic waves that radiate into space (When receiving electromagnetic signals, the antenna performs the reverse process). According to spatial structures, the antenna can be divided into several types which include wire antenna and cambered surface antenna. In the field of microwave communication and radio astronomy, in order to detect weak electromagnetic signals and achieve better communication quality, the antenna should have good directivity and high gain, so it needs a large receiving area to make the detecting equipment have better performance.. We study theoretically a new type of subwavelength cavity antenna using MNMs which has large receiving area, good directionality and high gain within GHz region. We present the performance of the subwavelength cavity antenna on MNMs with a single metallic patch as the radiation source. Large area subwavelength cavity antenna is introduced, where the relationship between patterns of the patch array as the radiation source and optimal receiving area of the antenna is discussed systematically.
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