Planar horn antenna with impedance calibration function

Abstract

The invention discloses a planar horn antenna with an impedance calibration function, and relates to a horn antenna. The planar horn antenna comprises a micro-strip feeder (1), a horn antenna (2) and metallized via holes (3) which are integrated on a dielectric substrate (4), wherein the micro-strip feeder (1) is connected with an antenna port (5) and a narrow antenna port (6), the horn antenna (2) comprises a first metal plane (8), a second metal plane (10) and two rows of metallized via hole horn side walls (11), metallized via hole arrays (14) consisting of the metallized via holes (3) form a plurality of dielectric-filled waveguides (16) in the horn antenna (2), one end of each dielectric-filled waveguide (16) faces the narrow antenna port (6), the other end of each dielectric-filled waveguide (16) is arranged on an antenna aperture plane (15), and the wave impedance of each dielectric-filled waveguide (16) is equal to the wave impedance of free space owing to the width of the dielectric-filled waveguide (16). The planar horn antenna has the advantages that return loss of the antenna can be reduced, and gain of the antenna can be increased.

Description

technical field [0001] The invention relates to a planar horn antenna, in particular to an impedance-calibrated planar horn antenna. Background technique [0002] Horn antennas are widely used in systems such as satellite communications, ground microwave links, and radio telescopes. However, the larger geometric size of the three-dimensional horn antenna and the incompatibility with the planar circuit process make its cost higher, thus limiting the development of its application. 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 planar integration and simple processing. The substrate integrated waveguide planar horn antenna based on the substrate integrated waveguide not only has the characteristics of the horn antenna, but also realizes the miniaturization and light weight of the hor...

AI Technical Summary

Problems solved by technology

The substrate integrated waveguide planar horn antenna based on the 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 integrate in the microwave millimeter wave planar circuit, but the traditional The gain of the substrate integrated waveguide planar horn antenna is relatively low. The reason is that due to the continuous opening of the horn mouth, the wave impedance of the electromagnetic wave on the aperture surface is different from that of the free space, and the electromagnetic wave is caused on the interface between the medium and the horn. Reflection, affecting the return loss and radiation performance of the antenna

At present, methods such as dielectric loading and dielectric prisms have been used to correct the asynchronous phase of the horn aperture field, but these methods cannot improve the inconsistency between the horn antenna and free space wave impedance on the aperture surface, and these phase alignment structures increase the overall antenna structure size

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