CN105633593A

CN105633593A - Array antenna

Info

Publication number: CN105633593A
Application number: CN201410605379.9A
Authority: CN
Inventors: 不公告发明人
Original assignee: Kuang Chi Institute of Advanced Technology
Current assignee: Kuang Chi Institute of Advanced Technology
Priority date: 2014-10-30
Filing date: 2014-10-30
Publication date: 2016-06-01

Abstract

The invention is suitable for the technical field of communication, and provides an array antenna. The antenna comprises an antenna reflector plate, a radiator array disposed on the antenna reflector plate, and a high-resistance surface reflecting plate which is connected with the edge of the antenna reflector plate and is inclined in an electromagnetic radiation direction. The high-resistance surface reflecting plate comprises a substrate and a conductive geometric structure which is periodically arranged on the surface of the substrate so as to form a high-resistance surface. The conductive geometric structure is a miniature structure which is made of a metal or nonmetal conductive material. The periphery of the antenna reflector plate is provided with the high-resistance surface reflecting plate, and the surface is provided with the periodic miniature structure, thereby forming the high-resistance surface. The high-resistance surface can inhibit the transmission of a surface wave, and blocks a surface current. A far region sidelobe of the antenna is reduced, the gain, directivity and interference resistance of the antenna are improved, and the gain of the antenna is not affected. Moreover, compared with a conventional toothed-edge reflecting plate antenna, the antenna reduces the machining difficulty while effectively reducing the sidelobe, is better in sidelobe inhibition, and is suitable for wide application.

Description

A kind of array antenna

Technical field

The invention belongs to communication technique field, particularly to a kind of array antenna.

Background technology

One of basic function of antenna is that the energy obtained from feed space radiation towards periphery is gone out, two be towards the radiation of required direction major part energy, the maximum lobe of radiant intensity is called main lobe, remaining lobe is called secondary lobe or secondary lobe, and the energy of secondary lobe affects the gain of antenna, directivity and capacity of resisting disturbance compared with conference. In order to increase main lobe energy, optimize the directivity of radiation, improve the capacity of resisting disturbance of antenna, usually require that and reduce secondary lobe as far as possible. The reflecting plate of traditional antenna is due to the effect of radiated electromagnetic wave, it will usually produce surface current, and this is one of principal element producing secondary lobe, and in order to solve this problem, prior art is by being processed into broached-tooth design by reflecting plate edge, but technique is extremely complex.

Summary of the invention

It is an object of the invention to provide a kind of array antenna, it is intended to reduce far field secondary lobe, optimize antenna signal to noise ratio, improve gain and the capacity of resisting disturbance of antenna.

The present invention is realized in, a kind of array antenna, including antenna-reflected plate, the radiant body array that is arranged on described antenna-reflected plate, and the high impedance surface reflecting plate being connected with the edge of described antenna-reflected plate and tilting to electromagnetic radiation direction, described high impedance surface reflecting plate includes a substrate and in the arrangement of the described substrate surface cycle conduction geometry to form high impedance surface, and described conduction geometry is the micro structure being made up of metal or nonmetallic conductive material.

The present invention is at the high impedance surface reflecting plate being arranged around tilting of antenna-reflected plate, its surface is provided with the micro structure of periodic distribution, and then formation high impedance surface, surface wave transmission can be suppressed, block surface current, and then the far field secondary lobe of reduction antenna, improve the gain of antenna, directivity and anti-interference, and on antenna gain without impact; Further, compared with traditional toothed edge reflection plate antenna, while effectively reducing secondary lobe, also reduce difficulty of processing, be suitable for widely used.

Accompanying drawing explanation

Fig. 1 is the structural representation of the array antenna that the embodiment of the present invention provides;

Fig. 2 is the high impedance surface reflecting plate that provides of the embodiment of the present invention and the structural representation of antenna-reflected plate;

Fig. 3 is the partial structurtes schematic diagram of the high impedance surface reflecting plate that the embodiment of the present invention provides;

Fig. 4 is the structural representation of the radiant body array that the embodiment of the present invention provides;

Fig. 5 is the comparison diagram of directional diagram of the array antenna that provides of the embodiment of the present invention and traditional antenna.

Detailed description of the invention

In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.

Below in conjunction with specific embodiment, implementing of the present invention is described in detail:

Refer to Fig. 1 and Fig. 2, the embodiment of the present invention provides a kind of array antenna, including the radiant body array 1 for radiated electromagnetic wave and the antenna-reflected plate 2 for reflection electromagnetic wave, radiant body array 1 is arranged on antenna-reflected plate 2, this array antenna also includes the high impedance surface reflecting plate 3 being arranged at the surrounding of antenna-reflected plate 2, this high impedance surface reflecting plate 3 is connected with the edge of antenna-reflected plate 2 and tilts to the direction of electromagnetic radiation, high impedance surface reflecting plate 3 can be structure as a whole with antenna-reflected plate 2, it is also possible to individually docks with antenna-reflected plate 2 after processing. With further reference to Fig. 3, Fig. 3 only illustrates the part-structure of high impedance surface reflecting plate 3, this high impedance surface reflecting plate 3 includes a substrate 31 and at its surface periodic arrangement conduction geometry to form high impedance surface, conduction geometry is the micro structure 32 being made up of metal or nonmetallic conductive material, and the micro structure 32 of cycle arrangement forms the high impedance surface that can block surface current. This high impedance surface reflecting plate 3 can be processed by double-sided copper-clad dielectric-slab, in the facet etch micro structure towards radiant body array. The periodic distribution of micro structure 32 can cause energy cascade, form forbidden band or passband, the wave frequency of radiant body array 1 radiation is in the electromagnetic forbidden band of high impedance surface, and then surface current can be blocked, reduce far field secondary lobe, owing to high impedance surface reflecting plate 3 is arranged at antenna-reflected plate 2 around, on antenna gain without impact.

Further, the edge of high impedance surface reflecting plate 3 can be smooth straight line or curve, without being processed into zigzag, is 90��180 �� with the angle of antenna-reflected plate 2, and this angle is �� angle shown in figure. When reality manufactures, the region according to the secondary lobe to suppress, suitably select angle, when this angle is bigger, near region secondary lobe inhibition is better, when this angle is less, far field secondary lobe inhibition is better.

With further reference to Fig. 3, micro structure 32 be laid in the surface of dielectric-slab 31, shape and size identical and in array distribution. The adjacent distance between micro structure 32 is preferably smaller than the 1/2 of aerial radiation wavelength. Concrete spacing is determined by the form of micro structure 32 and the dielectric constant of dielectric-slab 31, is generally the 1/10��1/2 of wavelength.

In the present embodiment, the shape of micro structure 32 can for the I-shaped shown in Fig. 3, it is also possible to be the derivative shape of I-shaped, for instance the shape that two " work " words are orthogonal, asShape. The micro structure of this shape can respond two kinds of electromagnetic waves that polarised direction is perpendicular. Certainly, this micro structure can also is that " ten " font or the derivative shape of " ten " font, it is also possible to two kinds of electromagnetic waves that response polarised direction is perpendicular.

In the present embodiment, the material of the preferred dielectric constant of substrate 31 of high impedance surface reflecting plate 3 relatively big (being preferably greater than 4) makes, for instance FR4. That so can the size of micro structure 32 be done is less, and then the more crypto set that can do, and then makes the concordance of the electromagnetic performance in each region of high impedance surface reflecting plate better, and electromagnetic regulating effect is better.

In the present embodiment, radiant body array 1 can be formed by multiple independent radiation cell array arrangements. Can also be as shown in Figure 4, it is made up of the support component 11 of array arrangement and the radiation front layer 12 being arranged on support component, this radiation front layer 12 includes a dielectric layer 121, dielectric layer 121 etched multiple radiating element 122, support component 11 and radiating element 122 one_to_one corresponding, each group of support component 11 and radiating element 122 constitute a radiating element, and radiant body array is integrally formed.

The present invention is arranged around high impedance surface reflecting plate 3 at antenna-reflected plate 2, it is suppressed that the surface wave transmission at reflecting plate edge, blocks surface current, reduces the far field secondary lobe of antenna, improves the gain of antenna, directivity and anti-interference. Fig. 5 illustrates the comparison diagram of the directional diagram of array antenna provided by the invention and traditional array antenna, the gain of vertical coordinate representative antennas, abscissa represents the angle with main lobe central shaft, wherein, solid line represents the directional diagram of traditional array antenna adopting conventional reflector plate, dotted line represents and adds the antenna radiation pattern tilting reflecting plate around plate shaped reflecting plate, wherein, the left-half of dotted line represents the directional diagram adopting common edge to tilt reflecting plate, the right half part of dotted line represents the directional diagram of the high impedance surface reflecting plate adopting identical tilting angle, this high impedance surface reflecting plate adopts FR4 material to make substrate, and copper material is set on substrateThe angle of shape micro structure, high impedance surface reflecting plate and antenna-reflected plate is 110��120 ��, and high impedance surface reflecting plate is comparatively notable on the impact of edge current as seen from the figure, and secondary lobe is significantly suppressed. And the traditional toothed edge reflection plate antenna of this antenna ratio is compared, while effectively reducing secondary lobe, reduce again difficulty of processing, be suitable for widely used.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.

Claims

1. an array antenna, it is characterized in that, including antenna-reflected plate, the radiant body array that is arranged on described antenna-reflected plate, and the high impedance surface reflecting plate being connected with the edge of described antenna-reflected plate and tilting to electromagnetic radiation direction, described high impedance surface reflecting plate includes a substrate and in the arrangement of the described substrate surface cycle conduction geometry to form high impedance surface, and described conduction geometry is the micro structure being made up of metal or nonmetallic conductive material.

2. array antenna as claimed in claim 1, it is characterised in that the angle of described high impedance surface reflecting plate and described antenna-reflected plate is 90��180 ��.

3. array antenna as claimed in claim 2, it is characterised in that the angle of described high impedance surface reflecting plate and described antenna-reflected plate is 110��120 ��.

4. array antenna as claimed in claim 1, it is characterised in that described high impedance surface reflecting plate and described antenna-reflected plate are structure as a whole.

5. array antenna as claimed in claim 1, it is characterised in that the shape of described micro structure is identical with size and is distributed in array.

6. array antenna as claimed in claim 1, it is characterised in that the adjacent distance between micro structure is less than the 1/2 of aerial radiation wavelength.

7. the array antenna as described in any one of claim 1 to 6, it is characterised in that the derivative shape being shaped as I-shaped or I-shaped of described micro structure.

8. the array antenna as described in any one of claim 1 to 6, it is characterised in that described micro structure be shaped as " ten " font or the derivative shape of " ten " font.

9. the array antenna as described in any one of claim 1 to 6, it is characterised in that described radiant body array is formed by multiple independent radiation cell array arrangements.

10. the array antenna as described in any one of claim 1 to 6, it is characterized in that, described radiant body array includes multiple support components of the array arrangement being arranged on described antenna-reflected plate, and it is arranged at the radiation front layer on described support component, described radiation front layer includes a dielectric layer and the multiple radiating elements etched on described dielectric layer, described support component and radiating element one_to_one corresponding.