Vertically polarized antenna

Abstract

The present invention provides a vertically polarized antenna which comprises three layers of the dielectric plates which are a first layer, a second layer and a third layer. The right end of each layer of dielectric plate has a section of L area extending leftward from the right boundary of the dielectric plate, a stepped substrate integrated waveguide structure whose L area height is higher than that of the left side of the L area is formed by the whole second layer, a first layer L area and a third layer L area together. The length of the L area is L. The vertically polarized antenna comprises the stepped substrate integrated waveguide structure, through using the step transition technology is employed at an E plane, for E plane discontinuities, the transition of the E plane is carried out directly, the antenna standing wave is greatly improved, the efficiency is high, the size is only changed for several millimeters, according to the E plane transition structure, the antenna E plane directivity can be improved, at the same time through laying electromagnetic band gap structures at upper and lower surfaces, in the condition of not enlarging the antenna size, the backward radiation is greatly inhibited, and the antenna E plane directivity is further improved.

Description

technical field [0001] The invention belongs to the field of antennas, in particular to a vertically polarized antenna whose polarization direction is perpendicular to a circuit board. Background technique [0002] For indoor communication, compared with the traditional base station antenna, the ceiling-mounted small base station antenna has the advantages of small size, does not occupy indoor floor space, is far away from ground shelters, increases the distance between the base station and the user group, and reduces potential radiation hazards. It is the future development direction of indoor small base stations. [0003] Base station antennas generally use horizontal / vertical dual-polarized antennas. For the generation of vertically polarized components, the traditional method is to weld a section of vertical cylindrical or conical metal on a horizontally placed circuit board, which is equivalent to a monopole antenna. Electromagnetic waves, because this method requires ...

AI Technical Summary

Problems solved by technology

[0005] Since the height of the substrate-integrated waveguide (the plane where the electric field E is located, that is, the plane perpendicular to the substrate, referred to as the E plane) is the thickness of the dielectric substrate, it is often only a few millimeters high, which is far smaller than the size of ordinary waveguides. Larger discontinuities cause impedance mismatch at the same time, and a large number of electromagnetic waves are reflected back to the inside of the substrate integrated waveguide, which greatly affects the radiation efficiency

Since the height is also much smaller than the wavelength, the electromagnetic wave is prone to diffraction, resulting in a large amount of backward radiation, which affects the directivity of the antenna

The substrate-integrated waveguide H-plane aperture antenna tries to compensate the reflection caused by the E-plane discontinuity through the H-plane excessive structure, which greatly increases the volume of the antenna

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