Array antenna with reduced profile

Abstract

The utility model relates to the technical field of communication. An array antenna with a reduced profile comprises a dielectric substrate, the dielectric substrate is provided with a first surface and a second surface which are opposite, the array antenna further comprises an antenna ground located on the first surface and a metal layer located on the second surface, and the metal layer comprises a monopole antenna located in the center and extending upwards. The bottom of the monopole antenna is connected with the antenna ground; the metal layer comprises a plurality of antenna radiators, the antenna radiators are arranged on the periphery of the monopole antenna in a surrounding mode, each antenna radiator comprises two metal sheets which are arranged in a central symmetry mode, and a cutting gap exists between the two metal sheets. According to the utility model, surface waves are excited through the monopole antenna which is vertically arranged at the central position, and the antenna device has the advantages of low profile, low cost and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of communications, in particular to an antenna. Background Art

[0002] At present, the main ways to control vortex electromagnetic waves are reflective array antennas and transmission array antennas. For reflective array antennas and transmission array antenna devices, since horn antennas are used to control the radiation of array antenna units through air feeding, there are problems such as high cost and large cross-section.

[0003] There is currently a lack of an antenna structure that can reduce the profile. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides an array antenna with a reduced cross-section, which solves at least one of the above-mentioned technical problems.

[0005] The technical solution of the utility model is: an array antenna with a reduced cross-section, comprising a dielectric substrate, the dielectric substrate having a first surface and a second surface opposite to each other, and also comprising an antenna ground located on the first surface and a metal layer located on the second surface, characterized in that the metal layer comprises a monopole antenna located in the center and extending upward, the bottom of the monopole antenna is connected to the antenna ground, and the monopole antenna is cylindrical;

[0006] The metal layer includes a plurality of antenna radiators, the antenna radiators are arranged around the periphery of the monopole antenna, each antenna radiator includes two metal sheets arranged symmetrically with respect to the center, and a cutting gap exists between the two metal sheets;

[0007] A grid structure is formed by the gaps between adjacent antenna radiators, the grid structure includes a first gap with a width value of A and a second gap with a width value of B, the width value of the first gap is greater than the width value of the second gap; adjacent first gaps are interconnected to form a structure arranged spirally from the inside to the outside.

[0008] The utility model uses a monopole antenna to replace the air-feed method of a horn antenna, and excites surface waves through a monopole antenna placed vertically at the center. The surface waves are modulated by the impedance of the antenna radiator and then converted into vortex electromagnetic waves radiated in space. The antenna device has the advantages of low profile, low cost, and diversified methods of regulating vortex electromagnetic waves.

[0009] Further preferably, the antenna radiators are arranged in a matrix pattern around the monopole antenna.

[0010] Further preferably, a through hole is opened in the center of the dielectric substrate, and the monopole antenna extends upward from the through hole.

[0011] Further preferably, the height of the monopole antenna is 4.45 mm.

[0012] Further preferably, there is an isolation gap between the monopole antenna and an adjacent antenna radiator.

[0013] Further preferably, the size of the cutting gaps in all antenna radiators is 0.2 mm.

[0014] Further preferably, the metal sheet is a right-angled trapezoid or a right-angled triangle.

[0015] Beneficial effect: Compared with the method of using a horn antenna to control the radiation of the array antenna unit through air feeding, the utility model reduces the cross-sectional size and can reduce the traditional cross-sectional size of 2-3cm to 4.45mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the central position of a specific embodiment 1 of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of a specific embodiment 1 of the utility model;

[0018] Figure 3 This is a diagram of circular polarization gain test results of specific embodiment 1 of the utility model;

[0019] Figure 4 This is a test result diagram of circular polarization near-field phase distribution of specific embodiment 1 of the utility model;

[0020] Figure 5 This is a test result diagram of circularly polarized near-field amplitude distribution of specific embodiment 1 of the utility model.

[0021] In the figure: 1 is a dielectric substrate, 2 is a monopole antenna, and 3 is a metal sheet. DETAILED DESCRIPTION

[0022] See also Figures 1 to 5, Specific embodiment 1, a cross-section-reduced array antenna, comprising a dielectric substrate 1, the dielectric substrate 1 having a first surface and a second surface opposite to each other, an antenna ground located on the first surface, and a metal layer located on the second surface, the metal layer comprising a monopole antenna 2 extending upward from the center, the bottom of the monopole antenna 2 being connected to the antenna ground; the monopole antenna is cylindrical; the metal layer comprises a plurality of antenna radiators, the antenna radiators are arranged around the periphery of the monopole antenna 2, each antenna radiator comprises two metal sheets 3 arranged symmetrically from the center, and a cutting gap exists between the two metal sheets 3. A grid-like structure is formed by the gaps between adjacent antenna radiators, the grid-like structure comprises a first gap with a width value of A and a second gap with a width value of B, the width value of the first gap being greater than the width value of the second gap; adjacent first gaps are connected to each other to form a structure arranged spirally from the inside to the outside. Adjacent second gaps are connected to each other to form a structure arranged spirally from the inside to the outside.

[0023] The utility model excites surface waves through a monopole antenna 2 placed vertically at the center, and the surface waves are modulated by the impedance of the antenna radiator and then converted into vortex electromagnetic waves radiated in space. The antenna device has the advantages of low profile, low cost, and diversified ways of regulating vortex electromagnetic waves.

[0024] The antenna radiators are arranged in a matrix on the periphery of the monopole antenna 2. There may be more than 3,000 antenna radiators. The multiple antenna radiators are arranged in a 60*60 matrix.

[0025] A through hole is provided in the center of the dielectric substrate 1 , and the monopole antenna 2 extends upward from the through hole.

[0026] The height of the monopole antenna 2 is 4.45 mm. There is an isolation gap between the monopole antenna 2 and the adjacent antenna radiator.

[0027] The size of the cutting gap in all antenna radiators is 0.2 mm.

[0028] The metal sheet 3 is in the shape of a right trapezoid or a right triangle.

[0029] The cutting gaps of adjacent metal patches have different inclination angles. The angle between the adjacent sides of two metal patches 3 of adjacent antenna radiators in all antenna radiators is 0-90°.

[0030] The thickness of the dielectric substrate is 1.6 mm, and the gap between adjacent antenna radiators is 0.1 mm-1.1 mm.

[0031] The dielectric substrate is an F4B dielectric substrate with a dielectric constant of 2.2.

[0032] The working frequency of this antenna is 17GHz circular polarization antenna. When the structure of this utility model is used for testing, refer to Figure 3 , the gain component of the right-hand circular polarization pattern has a central depression, which is consistent with the characteristics of the far-field pattern of the vortex electromagnetic wave. At the same time, at an elevation angle of 5 or -5 degrees, the right-hand circular polarization (RHCP) gain component (Realized Gain) obtains a maximum gain of 17.8dB. The gain of the left-hand circular polarization (LHCP) component is less than -14dB, that is, the main polarization is 31.8dB greater than the cross polarization in the maximum gain direction. See Figure 4 as well as Figure 5 From the circular polarization near-field phase distribution test result diagram and the circular polarization near-field amplitude distribution test result diagram, it can be seen that a vortex electromagnetic wave is formed.

[0033] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An array antenna with a reduced profile, comprising a dielectric substrate having a first surface and a second surface opposite to each other, an antenna ground located on the first surface and a metal layer located on the second surface, wherein: The metal layer includes a monopole antenna located in the center and extending upward, the bottom of the monopole antenna is connected to the antenna ground, and the monopole antenna is cylindrical; The metal layer includes a plurality of antenna radiators, the antenna radiators are arranged around the periphery of the monopole antenna, each antenna radiator includes two metal sheets arranged symmetrically with respect to the center, and a cutting gap exists between the two metal sheets; A grid structure is formed by the gaps between adjacent antenna radiators, the grid structure includes a first gap with a width value of A and a second gap with a width value of B, the width value of the first gap is greater than the width value of the second gap; adjacent first gaps are interconnected to form a structure arranged spirally from the inside to the outside.

2. The array antenna with reduced profile according to claim 1, characterized in that: The antenna radiators are arranged in a matrix pattern on the periphery of the monopole antenna.

3. The array antenna with reduced profile according to claim 1, characterized in that: A through hole is provided in the center of the dielectric substrate, and the monopole antenna extends upward from the through hole.

4. The array antenna with reduced profile according to claim 1, characterized in that: The height of the monopole antenna is 4.45 mm.

5. The array antenna with reduced profile according to claim 1, characterized in that: An isolation gap exists between the monopole antenna and an adjacent antenna radiator.

6. The array antenna with reduced profile according to claim 1, characterized in that: The size of the cutting gap in all antenna radiators is 0.2 mm.

7. The array antenna with reduced profile according to claim 1, characterized in that: The metal sheet is a right-angled trapezoid or a right-angled triangle.

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