A reflector and difference network antenna

A reflective surface and parabolic antenna technology, applied in the direction of antennas, waveguide horns, electrical components, etc., can solve the problems of beam deformation, influence and poor beam performance, side lobe improvement, etc., achieve simple shape and structure, reduce occlusion effect, improve Effects on Radar Performance

Active Publication Date: 2022-07-29
NANJING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the positive-fed reflector antenna, the feed horn needs to be installed on the focal point of the paraboloid, which will inevitably block the center of the paraboloid's mouth surface field, reducing the energy of the main lobe of the pattern and causing multiple reflections. Affects the electric field distribution of the surface field at the antenna port, eventually leading to a decrease in the main lobe level of the sum and difference beam, an increase in the side lobe level, and a decrease in antenna gain. In severe cases, the main lobe of the pattern will be deformed
In order to overcome the shortcoming of the feed source shielding of the feedforward antenna, the method of offset feeding can also be used (Offset-parabolic-reflector antennas: A review [J]. Proceedings of the IEEE, 1978, vol.66, no.12, pp.1592-1618), but the offset-fed antenna is not conducive to forming a sum-difference beam with a good shape
This is because the equivalent phase center of the feed source will largely deviate from the focus of the reflector antenna during offset feeding. As the distance between the phase center and the focus of the paraboloid increases, the problem of offset will be serious. On the one hand, it will affect The performance of the sum and difference beam makes the side lobe increase, the beam deformation and the null depth become larger, which is extremely unfavorable for meeting the performance requirements such as high resolution of the antenna; on the other hand, the offset feed makes the design of the antenna structure more difficult. In addition, it is necessary to carry out complex shaping of the horn feed, which eventually leads to an increase in the overall size of the antenna, which makes it difficult to guarantee the fixed installation and service life of the antenna

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Examples

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Embodiment 1

[0027] refer to figure 2 , image 3 , this example is designed as a reflector antenna with a 2×2 array feed, and the design steps are as follows: The 2×2 array reflector antenna in this example includes a reflector antenna 201, a pair of monaural horn feeds 202, and a sum-difference Network 203. In the antenna, the reflector antenna 201, the sum-difference network 203, and the standard waveguide are common structures. The monaural horn feed 202 is extended from a standard waveguide structure 204 to a horn antenna, and the monaural structures 205 are extended on both sides thereof. It should be noted that in this example, because the feed array is a 2×2 structure, each feed horn is a monoaural horn feed, and all monoaural structures are a section of cylindrical surface with a radius of R , the angle is All single-ear structures together wrap the outermost side of the entire array. If the feed array has more than 2 rows or 2 columns of speaker feeds, it is only necessary ...

Embodiment 2

[0029] The beam shape designed in this example is a fan beam, the working frequency range is 76-77 GHz, the working mode is horizontal scanning, and the structure is a box reflector antenna.

[0030] The present invention belongs to a feed-forward parabolic reflector antenna, and the design steps are as follows: Figure 4 As shown, the sector and difference beam horizontal scanning box antenna is composed of a reflector antenna 301, a pair of metal plates 302, a pair of transition structures 304, a pair of monaural horn feeds 303, a curved waveguide 305, and a sum-difference network 306. . First, determine the size of the parabolic reflector. According to the central operating frequency of 76.5GHz, the corresponding operating wavelength λ is calculated to be about 3.92mm, and then the diameter of the rectangular aperture field of the parabolic reflector D (D E and D H ) are estimated from the target azimuth and elevation angles of the sum beam respectively, and the empirica...

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Abstract

The present invention proposes a reflector and difference network antenna. The antenna includes a reflector antenna, a feed source and a sum-difference network, the feed source is connected to the sum-difference network, wherein the feed source adopts a monaural horn, and two or more monaural horns are symmetrically distributed in pairs at the focal point of the reflector antenna. Both sides; the single-ear horn is in the shape of a pyramid horn, and the edge of the bell mouth is extended with a single-ear structure. The novel reflector and difference network antenna proposed by the present invention provides an effective solution for the occlusion of the reflector antenna by the feed source, and can obtain high gain, Low sidelobes, low null depth and highly symmetrical sector and difference beams.

Description

technical field [0001] The invention relates to the field of radio frequency antennas, in particular to a sum-difference network antenna structure using a monaural horn as a feed source. Background technique [0002] In recent years, millimeter-wave radar technology has become increasingly mature. Compared with infrared, millimeter-wave has less atmospheric attenuation, better penetration of smoke and dust, and is less affected by weather. These excellent properties determine that millimeter-wave radar has all-day time All-weather working ability, has a wide range of engineering applications in traffic supervision, security deployment and control, target search and so on. As an important part of millimeter-wave radar, the performance of antenna directly affects the detection and tracking ability of the radar. [0003] Many studies have been carried out on millimeter-wave radar antennas at home and abroad, such as biased feed reflector antennas, multi-beam antennas, and mono...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q13/02H01Q15/16
CPCH01Q13/02H01Q15/16
Inventor 纪小丽王珂廖轶明
Owner NANJING UNIV
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