Thin-substrate amplitude correction broadband difference-beam planar horn antenna

Abstract

The invention provides a thin-substrate amplitude correction broadband difference-beam planar horn antenna and relates to a horn antenna. The thin-substrate amplitude correction broadband difference-beam planar horn antenna comprises a micro-strip feeder line (2), a horn antenna body (3) and log-periodic oscillators (4) which are located on a dielectric substrate (1), wherein the horn antenna body (3) consists of a first metal plane (7), a second metal plane (8) and two rows of metalized via hole horn side walls (9). The horn antenna body (3) is provided with an odd number of metalized via hole arrays (11) and an even number of dielectric-loaded waveguides (17), the dielectric-loaded waveguides (17) on the caliber face (10) of the horn antenna body (3) are identical in width and respectively connected with one of the log-periodic oscillators (4), and a left-half antenna (15) and the log-periodic oscillators (4) connected with the left-half antenna (15) are symmetric with a right-half antenna (16) and the log-periodic oscillators (4) connected with the right-half antenna (16). Electromagnetic waves can reach to the log-periodic oscillators in a constant-amplitude mode and then are radiated, and the polarization direction of a radiation field is parallel to the substrate. The thin-substrate amplitude correction broadband difference-beam planar horn antenna can be manufactured by using the thin substrate and is wide in frequency band, high in gain, large in null depth, low in cost and compact in structure.

Description

technical field [0001] The invention relates to a horn antenna, in particular to a planar horn antenna with thin substrate amplitude correction broadband difference beam. Background technique [0002] Horn antennas are widely used in systems such as satellite communications, ground microwave links, and radio telescopes. However, the huge geometric size of the three-dimensional horn antenna restricts its application and development in planar circuits. In recent years, the proposal and development of substrate-integrated waveguide technology have greatly promoted the development of planar horn antennas. The substrate-integrated waveguide has the advantages of small size, light weight, easy integration and fabrication. The planar substrate-integrated waveguide horn antenna based on the planar substrate-integrated waveguide not only has the characteristics of the horn antenna, but also realizes the miniaturization and light weight of the horn antenna, and is easy to integrat...

AI Technical Summary

Problems solved by technology

In addition, the gain of the traditional substrate-integrated waveguide planar horn antenna is relatively low. The reason is that due to the continuous opening of the horn mouth, the amplitude distribution of the electric field intensity when the electromagnetic wave propagates to the horn aperture surface is uneven, and the radiation directivity and gain are reduced. The zero depth of the formed difference beam antenna is shallow and the slope is low, which affects the direction finding accuracy of the radar

At present, methods such as dielectric loading and dielectric prisms have been used to correct the horn aperture field, but these methods can only improve the consistency of the phase distribution, but cannot improve the uniformity of the amplitude distribution, and these phase calibration structures increase the overall structural size of the antenna

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