A hemispherical broadband electrically small antenna based on the principle of near-field coupling

Abstract

The invention discloses a hemispherical broadband electrified small antenna based on the near-field coupling principle, and belongs to the technical field of antenna design. The antenna consists of outer metal radiation strips, an inner metal radiation strip, a hemispherical dielectric substrate, a grounding plate and a coaxial cable. The outer surface of the dielectric substrate is closely provided with the annular outer metal radiation strips with different lengths at regular intervals in an attached manner. The inner surface of the dielectric substrate is provided with the inner metal radiant strip in a pasted manner. The hemispherical dielectric substrate covers the grounding plate. The antenna adopts a bottom feed mode, an outer conductor of a feeder is connected with the grounding plate, and an inner conductor is connected with a metal strip on the inner surface of the dielectric substrate. The antenna provided by the invention has the advantages of small size and wide bandwidth,and the antenna structure is novel, simple to manufacture and easy to install. The antenna has low profile characteristics, has the advantage of working in a wide frequency range, and can be appliedto application communication, such as satellite navigation and wireless local area networks.

Description

technical field [0001] The invention belongs to the technical field of antennas and relates to a hemispherical broadband electrically small antenna based on the principle of near-field coupling. Background technique [0002] Because the size of an electrically small antenna is only one-tenth or even lower than the wavelength of the working frequency band, it is very suitable for use in an integrated communication system. However, traditional electrically small antennas are limited by the Chu limit, so the bandwidth and radiation efficiency of electrically small antennas are low, and cannot be applied to wireless communication systems. [0003] In recent years, for the inherent defects of electrically small antennas, methods of loading active circuits and loading metamaterial near-field coupling structures to improve the radiation efficiency of electrically small antennas have been proposed, but the bandwidth of electrically small antennas has rarely been expanded. Therefore...

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Problems solved by technology

However, traditional electrically small antennas are limited by the Chu limit, so the bandwidth and radiation efficiency of electrically small antennas are low, and cannot be applied to wireless communication systems

[0003] In recent years, for the inherent defects of electrically small antennas, methods of loading active circuits and loading metamaterial near-field coupling structures to improve the radiation efficiency of electrically small antennas have been proposed, but the bandwidth of electrically small antennas has rarely been expanded.

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