Dual-frequency antenna

Abstract

The invention discloses a coaxial dual-frequency antenna which comprises a waveguide tube, an annular groove, a high-frequency feed source and a dielectric ring. The waveguide tube is of a cylindrical structure and is used for transmitting first electromagnetic waves, the tube wall of the waveguide tube is provided with an annular groove with the opening direction identical to the output direction of the first electromagnetic waves, and the frequency of the first electromagnetic waves is lower than that of the electromagnetic waves emitted by the high-frequency feed source; the high-frequency feed source is located in the waveguide tube and is coaxial with the waveguide tube, and the first electromagnetic wave excites a transverse electric mode TE11 in the waveguide tube; the dielectric ring fills the space between the waveguide tube and the high-frequency feed source, the dielectric ring is of a multi-layer structure and is coaxial with the waveguide tube, the area of the plane, perpendicular to the axis, of each layer of dielectric ring changes alternately, and the height of the dielectric ring is smaller than that of the waveguide tube. Compared with the prior art, loss of a high-order mode in the waveguide tube can be avoided, a dielectric ring is omitted, and the radiation efficiency of the coaxial dual-frequency antenna is improved.

Description

technical field [0001] The present application relates to the field of wireless communication, in particular to a coaxial dual-frequency antenna that can be used for a dual-frequency parabolic antenna. Background technique [0002] With the rapid development of wireless communication technology, the transmission capacity of microwave point-to-point communication continues to increase, and microwave equipment in the Eband (71-76GHz, 81-86GHz) frequency band plays an increasingly important role in the base station backhaul network. However, because the "rain attenuation" of electromagnetic waves in the Eband frequency band is particularly serious, the Eband microwave single-hop distance is usually less than 3 kilometers. In order to increase the single-hop distance of Eband microwave and reduce the cost of building a station, one solution is to use Eband microwave equipment in combination with other low-frequency microwave equipment. When there is heavy rainfall, although Eban...

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