A Millimeter Wave Hollow Beam Antenna Based on Rectangular Waveguide Feed

Abstract

The invention provides a hollow beam antenna based on rectangular waveguide feed. The hollow beam antenna comprises a rectangular waveguide connecting section which can be connected with a rectangular waveguide feed structure; a rectangular-circular waveguide transition section which forms geometric transition between rectangular waveguide and circular waveguide; a coaxial cut-off section which realizes high-order mode cut-off and guided wave mode conversion; a conical horn which is used for radiating guided waves to the free space; a metal core which is used for forming a coaxial structure with a circular cavity; and conical dielectric which is used for fixing of the upper end of the metal core and beam angle adjustment. The TE10 mode guided waves of the rectangular waveguide are converted into the TEM mode guided waves of the coaxial waveguide by utilizing the waveguide transition structure and the cut-off structure, and feed of the conical horn antenna is performed by the TEM mode guided waves to form the hollow lobe direction radiation characteristic so that the hollow beam antenna is simple in structure and easy to process and realizes the miniaturized size and high overload endurance.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an antenna based on rectangular waveguide feeding to generate hollow lobe radiation characteristics. Background technique [0002] The hollow beam antenna refers to a type of antenna whose lobe pattern is radially symmetrical, and the direction of the maximum radiation gain forms a certain angle with the axis. The radiation direction of this type of antenna has the advantages of rotational symmetry, wide coverage angle, and omnidirectionality. This type of lobe structure is very suitable for anti-collision radar, automatic tracking, and remote sensing systems. Especially in the fuze system, it is necessary to detect the target in the space range of a certain angle with the tangent direction of its movement during the movement. Especially for the carrier that only slightly rotates or even does not rotate during its own movement. In the above environment, hollow beam antennas ar...

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Problems solved by technology

[0004] Document 1 (J.-S.Row and M.-C.Chan, Reconfigurable Circularly-Polarized Patch Antenna With Conical Beam, IEEE Transactions on antenna and propagation, 2010,58,(8):2753-2757) uses a patch antenna structure Realize the hollow beam, but because the beam shape and gain are affected by the array of radiation elements, it is difficult to control the size of the antenna in the normal direction of the radiation direction, and the array cannot be circularly symmetrical, resulting in poor omnidirectional effect of the pattern

[0005] Document 2 (S.-S.Qi, W.Wu, and D.-G.fang, Three sections circular waveguide aperture antenna with conical beam, IEEE Progress In Electromagnetics Research Letters, 2011, 22:147-154) uses circular waveguide high-order Mode radiation, but the feeding of coaxial probes limits the design of the front-end feed. At the same time, a matching section needs to be designed between circular waveguides with different calibers. The VSWR is determined by the actual size of the matching section, so this design requires high processing accuracy.

[0006] Document 3 (a millimeter-wave cone beam antenna based on circular waveguide TM0n mode, patent application number CN201310328312.0) also uses circular waveguide high-order mode radiation. Lack of support, prone to deformation under high overload conditions, affecting actual performance

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