Compact vertical polarization ultra-wideband omnidirectional antenna with conformal impedance surface

Abstract

The invention discloses a compact vertical polarization ultra-wideband omnidirectional antenna with a conformal impedance surface. The antenna comprises a circular metal ground board (1) with a circular hole in the middle, a cylindrical monopole antenna (2), a coaxial waveguide feeder line (3) and an annular impedance surface (4). The cylindrical monopole antenna (2) is vertically arranged at themiddle circular hole on the circular metal ground board (1). The coaxial waveguide feeder line (3) is located at the middle circular hole at the bottom of the circular metal ground board (1). The inner conductor of the coaxial waveguide feeding line (3) is connected with the cylindrical monopole antenna (2). The annular impedance surface (4) concentrically surrounds the periphery of the cylindrical monopole antenna (2). With the structure of the present invention, it is possible to realize an ultra-wideband vertically polarized antenna and keep stable omnidirectional radiation, low cross-polarization and high radiation efficiency throughout a whole operating band.

Description

technical field [0001] The invention belongs to the field of wireless communication system electronic devices, in particular to a vertically polarized ultra-wideband omnidirectional antenna with a conformal impedance surface, which provides stable omnidirectional radiation characteristics and high radiation efficiency in a wide frequency band with controllable bandwidth, and can be used It is used in the fifth generation mobile communication, car networking wireless communication and other fields. Background technique [0002] The electromagnetic impedance surface is a planar electromagnetic structure composed of planar subwavelength metal or dielectric units arranged in a periodic manner. By designing its electric and magnetic responses, it can be used to artificially control the interface characteristics of the electromagnetic field, and then effectively control the propagation of electromagnetic waves. and radiation. Planar electromagnetic impedance surfaces are widely u...

AI Technical Summary

Problems solved by technology

However, due to the non-rotational symmetry structure of this type of printed antenna, its radiation pattern is easily distorted with frequency changes, and thus cannot maintain stable omnidirectional radiation characteristics in an ultra-wide frequency band.

At the same time, in the high frequency band, since this type of antenna structure works in a more complex high-order mode and has a non-uniform current distribution, the cross-polarization of the antenna radiation pattern will become higher

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