Planar building block type antenna array

Abstract

The invention discloses a plane building block type antenna array, which comprises an antenna unit and a metal floor, and is characterized in that the building block type antenna unit is composed of an antenna substrate, a hard foam plate, a multifunctional metal disc and an oblique split connector, and is further fastened on the metal floor by virtue of four dielectric screws. Wherein a group of 4 * 4 circular metal patches are distributed on the surface of the upper layer of the antenna substrate, a group of 5 * 5 circular through holes penetrate through the whole substrate, and two pairs of diamond-like metal patches are distributed on the surface of the lower layer of the substrate, so that radiation arms of the dual-polarized dipole antenna are formed; the multifunctional metal disc comprises a metal disc and five metal cylinders; the wedge connector is composed of a metal inner core, a Teflon cylinder and a metal shell. Due to the fact that the building block type antenna units are designed in a planar and modularized mode, the low-profile and light-weight design of the UHF-band phased-array antenna is achieved, and meanwhile the array scale can be flexibly expanded by changing the size of the metal floor.

Description

Technical Field

[0001] The present application relates to the technical field of ultra-wideband array antennas, and in particular to a planar timber antenna array. Background Art

[0002] The UHF band generally refers to radio waves with a wavelength frequency in the range of 0.3GHz to 3GHz, corresponding to a wavelength of 1m to 0.1m, and is usually used in wireless communications, satellite communications, electronic countermeasures, and radar. As an important conversion component for electromagnetic wave radiation to the air, the use of antennas in the above systems is inevitable. With the development of modern communications and microelectronics technology, phased array systems are increasingly being used in the fields of communications, electronic countermeasures, and radar. At the same time, in order to reduce the number of platform equipment, phased array antennas are usually required to have ultra-wideband radiation capabilities. However, due to the short wavelength, existing UHF band phased array antennas usually have large unit sizes, which results in their heavy weight and inflexible array size.

[0003] In summary, in order to solve the problems of large thickness, heavy weight and inconvenient flexible deployment of existing UHF phased array antennas, the present invention proposes a flat building block type antenna array, in which the antenna units are modularly designed and are rectangular parallelepipeds of equal length and width. At the same time, the working bandwidth of the antenna array covers 5 times the frequency, and the cross-sectional height is less than 0.07 times the low-frequency wavelength. The antenna units are made of printed circuit board material and are light in weight, so the array size can be flexibly expanded like building blocks. Summary of the invention

[0004] The present application provides a planar timber-type antenna array, which can be used to solve the technical problems of the traditional UHF band phased array antenna being large in size, heavy in weight, and difficult to flexibly form an array.

[0005] The present application provides a planar timber-type antenna array, the planar timber-type antenna array comprising:

[0006] A metal floor and a plurality of modular antenna units neatly arranged on the metal floor;

[0007] The building block antenna unit includes an antenna substrate, a hard foam board, a multifunctional metal plate, and an oblique split connector;

[0008] The antenna substrate is located above the rigid foam board, and the multifunctional metal plate and the diagonal chopping connector are located inside the rigid foam board;

[0009] The building block antenna unit is fastened to the metal floor by means of four dielectric screws; the building block antenna unit is in the shape of a flat rectangular parallelepiped as a whole, with a length and width of 75 mm.

[0010] Furthermore, the antenna substrate includes two layers of microwave substrates, wherein the upper layer is a microwave substrate with a dielectric constant of 3.55, and a group of 4×4 circular metal patches are neatly distributed on the surface, and a group of 5×5 circular through holes are arranged in a chessboard pattern throughout the entire substrate; a circular metal patch is distributed at the center of every four circular through holes;

[0011] The dielectric constant of the lower substrate is 2.2, and two pairs of rhombus-shaped metal patches are symmetrically distributed on the four corners of the upper surface of the lower substrate, forming the radiation arms of the dual-polarized dipole antenna.

[0012] Furthermore, the rigid foam has a dielectric constant of 1.09 and is located below the antenna substrate. A circular through hole is located in the middle of the rigid foam, and a group of four semicircular through holes are located at the centers of the four sides of the rigid foam. The rigid foam is used for support.

[0013] Furthermore, the multifunctional metal disc is made of stainless steel and includes 1 metal disc and 5 metal cylinders;

[0014] The bottom of the metal cylinder is fixed to the metal floor by threads, and the metal disc is fastened to the five metal cylinders by a set of five metal screws;

[0015] The position and size of the metal disc matches the circular through hole in the middle of the rigid foam.

[0016] Further, the oblique split connector includes a metal inner core, a Teflon cylinder and a metal outer shell;

[0017] The outer shell of the metal shell is formed by a cylinder split obliquely along the bottom of the flange, and a cylindrical boss is arranged on the top of the shell, so as to cooperate with the metal inner core to realize the feeding of the antenna substrate;

[0018] The oblique split connector is fastened to the metal floor by means of two metal screws, and the position thereof corresponds to the positions of the semicircular through holes on the four sides of the hard foam.

[0019] Furthermore, the overall height of the planar timber antenna array is 51.6 mm;

[0020] The scale of the antenna array can be changed by changing the number of modular antenna units.

[0021] Compared with the prior art, the present invention has the following significant advantages: (1) The antenna unit of the present invention adopts a planar, modular design. For a phased array antenna, the array scale can be flexibly expanded like building blocks by changing the size of the metal floor; (2) The antenna unit of the present invention adopts a split connector. The connector forms a quasi-balanced feeding structure through a split and a boss structure, which is conducive to realizing ultra-wideband feeding of the antenna array; (3) The antenna substrate of the present invention integrates the antenna unit and the metal metasurface into an integrated design, and the circular through holes thereon are conducive to reducing the weight of the antenna array. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a 3D schematic diagram of a planar timber-type antenna array provided in an embodiment of the present application;

[0023] Figure 2 It is a front view of an embodiment of the present application;

[0024] Figure 3 is an exploded view of an antenna unit according to an embodiment of the present application;

[0025] Figure 4 is a schematic diagram of a multifunctional metal plate according to an embodiment of the present application;

[0026] Figure 5 This is a schematic diagram of an oblique split connector according to an embodiment of the present application;

[0027] Figure 6 is a schematic diagram of an antenna substrate according to an embodiment of the present application;

[0028] Figure 7 This is a schematic diagram of active standing waves on the E surface of an embodiment of the present application;

[0029] Figure 8 It is a schematic diagram of H-plane active standing wave in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0031] The present invention proposes a planar timber-type antenna array. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the following is established: Figure 1 An embodiment shown in FIG. Figure 1-Figure 8 The present invention is described in further detail.

[0032] like Figure 1 and Figure 2As shown, the present application provides an 8×8 scale planar modular antenna array embodiment, which is mainly used in the UHF frequency band, has a 5-fold ultra-wideband radiation capability, and the antenna cross-section height is only 0.07 times the low-frequency wavelength. The present invention includes: a metal floor 100 and a plurality of modular antenna units 101 arranged neatly on the metal floor 100; Figure 3 As shown, the modular antenna unit 101 has a planar rectangular shape, with a length and width of 75 mm, and includes an antenna substrate 102, a hard foam board 103, a multifunctional metal plate 104, and an oblique split connector 105. The antenna substrate (102) is located above the hard foam board (103), and the multifunctional metal plate (104) and the oblique split connector (105) are located inside the hard foam board (103);

[0033] Furthermore, the modular antenna unit 101 is fastened to the metal floor 100 by means of four dielectric screws 106 , and the number of modular antenna units 101 is determined according to needs, so that the array scale can be flexibly expanded like a building block.

[0034] like Figure 6 As shown, the antenna substrate 102 includes two layers of microwave substrates, wherein the upper microwave substrate 114 has a dielectric constant of 3.55, and a group of 4×4 circular metal patches are neatly distributed on the surface, and a group of 5×5 circular through holes are arranged in a chessboard pattern throughout the entire substrate; a circular metal patch is distributed at the center of every four circular through holes; the lower substrate 115 is a square with a dielectric constant of 2.2, and two pairs of rhombus-shaped metal patches are symmetrically distributed at the four corners of the upper surface of the lower substrate 115, forming the radiation arms of the dual-polarized dipole antenna.

[0035] Among them, the material of the hard foam 103 is a hard foam material with a dielectric constant of 1.09. It is located below the antenna substrate 102. A circular through hole is located in the middle of the hard foam 103, and four semicircular through holes are respectively located at the centers of the four sides of the hard foam to play a supporting role.

[0036] like Figure 4 As shown, the multifunctional metal disk 104 is made of stainless steel, including a metal disk 107 and five metal cylinders 108; wherein the bottom of the metal cylinder 108 is fixed to the metal floor 100 by a thread, and the metal disk 107 is fastened to the five metal cylinders 108 by a group of five metal screws 109. The position and size of the metal disk 107 match the circular through hole in the middle of the hard foam 103. The multifunctional metal disk has three functions: first, it increases the coupling effect between antenna units, thereby expanding the bandwidth of the antenna unit; second, it improves the cross-polarization level of the antenna unit at high frequencies; and third, it supports the antenna substrate structurally.

[0037] like Figure 5As shown, the split connector 105 includes a metal inner core 110, a Teflon cylinder 111 and a metal outer shell 112; wherein the outer shell of the metal outer shell 112 is formed by splitting a cylinder along the bottom of the flange, and a cylindrical boss is arranged on the top of the outer shell, so as to cooperate with the metal inner core 110 to feed the antenna substrate 102. The split connector 105 is fastened to the metal floor 100 by means of two metal screws 113, and the position thereof corresponds to the position of the semicircular through holes on the four sides of the hard foam 103.

[0038] The present application provides a planar timber antenna array, which operates in the 0.4 GHz to 2 GHz frequency band and radiates in dual polarization. Figure 7 and Figure 8 The active standing waves of the H-plane and E-plane of the units in the array are respectively given. It can be seen from the figure that this embodiment has good impedance matching characteristics within the working frequency band.

[0039] The present invention realizes a planar building block antenna array, in which the antenna unit is a planar modular design, so that the shape of the antenna array can be flexibly expanded like building blocks. At the same time, because the antenna substrate adopts an integrated design of the antenna unit and the metal metasurface, and with the strong coupling and structural support of the multifunctional metal disc, the overall thickness of the antenna array is only 0.07 times the low-frequency wavelength, realizing the low-profile and lightweight design of the UHF band phased array antenna.

[0040] The above-described embodiments of the present application do not constitute a limitation on the protection scope of the present application.

Claims

1. A planar timber antenna array, characterized in that: The planar timber antenna array comprises: A metal floor (100) and a plurality of modular antenna units (101) neatly arranged on the metal floor (100); The modular antenna unit (101) comprises an antenna substrate (102), a hard foam board (103), a multifunctional metal plate (104), and a diagonal connector (105); The antenna substrate (102) is located above the rigid foam board (103), and the multifunctional metal plate (104) and the oblique split connector (105) are located inside the rigid foam board (103); The modular antenna unit (101) is fastened to the metal floor (100) by means of four dielectric screws (106); the modular antenna unit (101) is in the shape of a planar rectangular parallelepiped as a whole, with a length and a width of 75 mm.

2. The planar stacked antenna array according to claim 1, characterized in that: The antenna substrate (102) comprises two layers of microwave substrates, wherein the upper layer is a microwave substrate (114) having a dielectric constant of 3.55, a group of 4×4 circular metal patches are neatly distributed on the surface, and a group of 5×5 circular through holes are arranged in a chessboard pattern throughout the entire substrate; a circular metal patch is distributed at the center of every four circular through holes; The lower substrate (115) has a dielectric constant of 2.2, and two pairs of rhombus-shaped metal patches are symmetrically distributed on the four corners of the upper surface of the lower substrate (115), forming the radiation arms of the dual-polarized dipole antenna.

3. The planar stacked antenna array according to claim 1, characterized in that: The rigid foam (103) has a dielectric constant of 1.09 and is located below the antenna substrate (102). A circular through hole is located in the middle of the rigid foam (103), and a group of four semicircular through holes are respectively located at the centers of four sides of the rigid foam. The rigid foam (103) is used for support.

4. The planar stacked antenna array according to claim 3, characterized in that: The multifunctional metal plate (104) is made of stainless steel and includes a metal disc (107) and five metal cylinders (108); The bottom of the metal cylinder (108) is fixed to the metal floor (100) by screw threads, and the metal disc (107) is fastened to the five metal cylinders (108) by a group of five metal screws (109); The position and size of the metal disc (107) match the circular through hole in the middle of the hard foam (103).

5. The planar stacked antenna array according to claim 3, characterized in that: The oblique split connector (105) comprises a metal inner core (110), a Teflon cylinder (111) and a metal outer shell (112); The outer shell of the metal shell (112) is formed by splitting a cylinder along the bottom of the flange at an angle, and a cylindrical boss is arranged on the top of the outer shell, so as to cooperate with the metal inner core (110) to realize feeding of the antenna substrate (102); The oblique split connector (105) is fastened to the metal floor (100) by means of two metal screws (113), and the position thereof corresponds to the positions of the semicircular through holes on the four sides of the hard foam (103).

6. The planar stacked antenna array according to claim 1, characterized in that: The overall height of the flat-surface timber antenna array is 51.6mm; The scale of the antenna array is changed by changing the number of modular antenna units (101).

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