Back-fed millimeter wave broadband double ridged horn antenna

Abstract

The invention provides a back-fed millimeter wave broadband double ridged horn antenna, belongs to the technical field of microwave and millimeter wave signal processing, and relates to a millimeter wave broadband horn antenna. The back-fed millimeter wave broadband double ridged horn antenna comprises a coaxial line excitation part, a ridge waveguide part and a double ridged horn part, wherein the coaxial line excitation part is formed by orderly connecting a coaxial line, a mode converting part and an impedance matching part; the mode converting part is formed by connecting a shielding panel line provided with a ridge and a coaxial line on the ridge side; the impedance matching part is stepped gradient double ridged waveguide; the ridge waveguide part is standard double ridged waveguide; and two ridges of the double ridged horn part are extended from two ridges of the ridge waveguide part to a mouth of a horn. The antenna adopts a back-fed structure, electromagnetic waves are fed in from the back of the ridge waveguide parallel to the ridge waveguide transmission direction, the coaxial line and the waveguide are positioned in the same axes, and a small voltage standing wave ratio can be obtained; and through mode conversion and impedance matching, the antenna can have satisfactory characteristics in a broadband range between 18 and 40GHz, and is characterized by wide frequency band, compact structure and good performance.

Description

technical field [0001] The invention belongs to the technical field of microwave and millimeter wave signal processing, and relates to a millimeter wave antenna, in particular to a millimeter wave broadband horn antenna. Background technique [0002] With the development of millimeter-wave technology, its role in aerospace, meteorological communication and modern military systems is becoming more and more important. Horn antennas are widely used in this field due to their large power capacity, wide frequency band, high gain and good directivity. The application and development, usually used as an independent antenna and feed. In order to extend the working frequency band of the antenna, it is necessary to add ridges to the horn antenna. [0003] The millimeter-wave double-ridged horn antenna (such as figure 1 (shown) is an in-line double-ridge horn antenna. The coaxial feed probes are inserted perpendicular to the E-plane of the waveguide, and a short circuit board is adde...

AI Technical Summary

Problems solved by technology

In order to be able to match better, the probe head should have a gradual change, but when the shape of the probe is irregular, the surface current distribution cannot be obtained accurately, so the theoretical analysis and calculation are difficult, resulting in the inability to carry out accurate and effective design, making the manufactured The performance of the coaxial feed part is poor, and the input standing wave is relatively large, especially in the case of millimeter wave and wide frequency band

In addition, because the coaxial connector and the waveguide form an angle of 90 degrees, it is inconvenient to connect in some cascaded systems, and when the transmission power is large, the top of the probe is prone to breakdown

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