CN105006642A - Single-negative material separating plate and broadband high-isolation monopole array antenna - Google Patents

Abstract

The invention discloses a single-negative material isolation plate and a broadband high-isolation monopole array antenna, which are composed of a dielectric substrate, a metal coating covering one side of the dielectric substrate, and an etching pattern etched on the metal coating; the above The etched pattern includes 4 groups of slots, and the above 4 groups of slots have a common graphic center, and these 4 groups of slots are centered on the graphic center and embedded and distributed from inside to outside. The present invention loads the single-negative material isolation plate with small size and simple structure on the monopole array antenna to suppress the mutual coupling of the array antenna, and finally obtains the array antenna with broadband and high isolation.

Description

Single Negative Material Isolation Plate and Broadband High Isolation Monopole Array Antenna

technical field

The invention belongs to the technical field of array antennas, and in particular relates to a single-negative material isolation plate and a broadband high-isolation monopole array antenna.

Background technique

Antennas are an integral part of wireless communication systems. Among them, compared with the performance of isolated antennas, antenna arrays can obtain superior antenna performance indicators, so array antennas are widely used in many communication systems. However, in the actual array antenna system, the antenna units are not isolated, and each antenna unit has electromagnetic coupling with other units during operation. We call this phenomenon the mutual coupling effect of the array antenna. Especially in small-pitch array antenna systems, such as MIMO (Multiple Input Multiple Output) systems, GPS (Global Positioning System) systems, etc., mutual coupling effects will adversely affect the performance of array antennas, such as radiation pattern distortion, input impedance changes, etc. . Under the trend of miniaturization of array antennas, the mutual coupling problem has become a key issue restricting the performance improvement of array antennas. Therefore, the research on mutual coupling and the method of mutual coupling suppression are of great significance in the field of antenna arrays.

At present, there are mainly two types of methods applied to reduce the mutual coupling effect of array antennas, and these methods play an important role in improving the performance of array antennas. The first type of method is to use algorithms and models to describe the complex mutual coupling characteristics of antenna arrays, and then use optimization algorithms to perform mutual coupling compensation. The second type of method is to introduce some special structures into the array antenna design to suppress the mutual coupling, such as defective ground structure (DGS, defective ground structure), electromagnetic bandgap structure (EBG, electromagneticbandgap) and so on. Among them, the array antenna loading DGS structure or EBG structure is currently the most widely used method in suppressing antenna mutual coupling. However, the DGS structure requires slots to be etched on the antenna floor, and the etched slots will leak electromagnetic energy and generate backward radiation. The EBG structure requires multiple periods, thus occupying a large space and complicated manufacturing process, which makes it very difficult to design a compact array antenna. At the same time, the DGS structure and EBG structure are mostly used in the mutual coupling suppression of planar microstrip antenna arrays, which are not suitable for application in high-profile antenna arrays.

When one of the equivalent medium parameters of the medium (permittivity ε and magnetic permeability μ) is negative and the other is positive, this type of medium can be called a single-negative metamaterial (SNG, single-negative metamaterial). Since the permittivity ε and permeability μ of the single negative material have one and only one negative value (εμ<0), the propagation constant β of the electromagnetic wave in the material is 0 and the attenuation constant α is greater than 0, the electromagnetic wave in the single negative material Propagation is rapidly attenuated, so single negative materials have band-stop electromagnetic transport properties. According to the characteristics of the single-negative material, we can apply the single-negative material (such as thin metal wire or SRR ring) to the array antenna to reduce the mutual coupling between the elements of the array antenna. This approach reduces the coupling between units by another 20dB or so. However, most single-negative materials are strong resonance structures, and their frequency band widths are very narrow (such as about 1%). The single-negative material with such a narrow frequency band width does not match the trend of broadbandization of modern systems, so its application in antenna systems is very limited. In 2010, Mohammed M. Bait-Suwailam et al. published the paper "Application of Magnetic Single Negative Materials in Mutual Coupling Reduction of High Profile MIMO Monopole Antenna Arrays" (Electromagnetic Coupling Reduction in High-Profile Monopole Antennas Using Single-Negative Magnetic Metamaterials for MIMO Applications[J].IEEE Trans.Antennas Propag.,2007,58(9):2894-2910.). In this paper, by loading a single-negative SRR structure isolator in the MIMO monopole antenna array, the isolation between antenna elements has reached more than 20dB without affecting the performance and structure of the array antenna. However, the 20dB isolation bandwidth of the array antenna in the article is only 4%. At the same time, the SRR isolator in this article has a large structure size, which obviously increases the volume of the antenna array and is not conducive to the miniaturization of the antenna. The above literature shows that the coupling between array elements can be reduced by loading a single negative material isolation plate, so as to obtain an array antenna with high isolation. At present, there is no report of a broadband high-isolation monopole array antenna based on a single-negative material isolation plate with a simple structure and small size.

Contents of the invention

The technical problem to be solved by the present invention is to provide a single-negative material isolation plate and a broadband high-isolation monopole array antenna, which loads a small-sized and simple-structure single-negative material isolation plate on the monopole array antenna to achieve The mutual coupling of the array antenna is suppressed, and finally a broadband and high isolation array antenna is obtained.

In order to solve the above problems, the present invention is achieved through the following technical solutions:

The single-negative material isolation plate is composed of a dielectric substrate, a metal coating covering one side of the dielectric substrate, and an etching pattern etched on the metal coating; the above etching pattern includes 4 groups of slots, and the above 4 groups of slots have a A common graphic center, and these 4 sets of slots are centered on the graphic center, and are embedded and distributed from the inside to the outside; among them, the innermost set of slots, that is, the first slot, includes 4 identical right-angle fan-shaped slots, And these 4 right-angled fan-shaped slots are symmetrically distributed around the center of the figure; the second slot located in the second inner layer is the I-shaped circular slot, and the I-shaped circular slot consists of a circle T-shaped slot and four identical T-shaped slots, the above-mentioned circular slot is centered on the center of the figure, the lower ends of the four T-shaped slots are connected with the circular slot, and the four T-shaped slots are centered on the center of the figure Symmetrical distribution; the third slot located in the second outer layer is a gear-shaped slot, and the gear-shaped slot has 8 identical rectangular slots, and these 8 rectangular slots are centered on the center of the figure The distribution is center-symmetrical; the fourth slot located in the outermost group of slots is a perfect circular slot, and the perfect circular slot takes the center of the figure as the center.

The symmetrical centerlines of the etching patterns in the circumferential direction correspond to each other, that is, the central symmetrical lines of the four right-angle fan-shaped slots of the first slot in the circumferential direction face the southeast, southwest, northwest and northeast directions respectively; The center symmetry lines of the four T-shaped slots of the second slot in the circumferential direction are respectively facing the directions of due east, due south, due west and due north; The lines of symmetry face due east, southeast, due south, southwest, due west, northwest, due north and northeast, respectively.

The dielectric substrate is square.

The broadband high-isolation monopole array antenna includes a ground plate and two monopole sub-array elements erected on the ground plate; a single negative material isolation plate is arranged between the above two monopole sub-array elements; The substrate, the metal coating covering one side of the dielectric substrate and facing one of the monopole sub-arrays, and the etching pattern etched on the metal coating; the etching pattern includes 4 sets of slots, and the 4 sets of slots have A common graphic center, and these 4 sets of slots are centered on the graphic center and distributed from the inside to the outside; the innermost set of slots, namely the first slot, includes 4 identical right-angle fan-shaped slots , and these 4 right-angled fan-shaped slots are center-symmetrically distributed with the center of the figure as the center; a group of slots located in the second inner layer, that is, the second slot is an I-shaped circular slot, and the I-shaped circular slot consists of 1 The circular groove and 4 identical T-shaped grooves are formed. The above-mentioned circular groove is centered on the center of the figure. The center is symmetrically distributed; the third slot located in the second outer layer is a gear-shaped slot, and the gear-shaped slot has 8 identical rectangular slots, and the 8 rectangular slots are centered on the center of the figure. The centers are symmetrically distributed; the outermost group of slots, that is, the fourth slot, is a perfect circular slot with the center of the figure as the center.

The symmetrical centerlines of the etching patterns in the circumferential direction correspond to each other, that is, the central symmetrical lines of the four right-angle fan-shaped slots of the first slot in the circumferential direction face the southeast, southwest, northwest and northeast directions respectively; The center symmetry lines of the four T-shaped slots of the second slot in the circumferential direction are respectively facing the directions of due east, due south, due west and due north; The lines of symmetry face due east, southeast, due south, southwest, due west, northwest, due north and northeast, respectively.

The single-negative material isolation plate is located at the midpoint of the two single-pole sub-array elements.

The dielectric substrate is square.

Compared with the prior art, the present invention has the following characteristics:

1. The single-negative material isolation plate in the present invention has a simple structure and low manufacturing cost, and is suitable for integrated batch processing. Due to the small size of the single-negative material isolation plate, the introduction of the isolation plate has little effect on the volume of the array antenna.

2. The broadband high-isolation monopole array antenna based on the single-negative material isolation plate of the present invention, the mutual coupling suppression performance of the monopole sub-array antenna can reach more than 20dB after loading the single-negative material isolation plate, and the 20dB isolation bandwidth reaches More than 10%. In the case of obtaining a broadband high-isolation monopole array, the operating frequency and bandwidth of the array did not change significantly after loading a single-negative material isolation plate.

Description of drawings

Fig. 1 is a schematic structural diagram of a single negative material isolation plate.

FIG. 2 is a schematic structural diagram of a broadband high-isolation monopole array antenna.

Fig. 3 is a TEM waveguide simulation model diagram of a single negative material isolation plate.

Figure 4 shows the equivalent medium parameters of a single negative material isolation plate.

Fig. 5 is a comparison diagram of the S parameters of the monopole subarray added with a single negative material isolation plate and the S parameter of the monopole subarray without a single negative material isolation plate.

Labels in the figure: 1, single-negative material isolation plate; 1-1, dielectric substrate; 1-2, metal cladding; 1-3, etching pattern; 1-3-1, first slot; 1-3-2 , the second slot; 1-3-3, the third slot; 1-3-4, the fourth slot; 2, the monopole array element; 3, the grounding plate.

Detailed ways

A single-negative material isolation plate, as shown in FIG. 1, consists of a dielectric substrate 1-1, a metal coating 1-2 covering one side of the dielectric substrate 1-1, and a metal coating etched on the metal coating 1-2. Etching pattern 1-3 constitutes. The above-mentioned single-negative material isolation board 1 is similar to a printed circuit board commonly used in the circuit field. The shape of the dielectric substrate 1-1 can be set according to the design requirements, for example, it can be circular, polygonal or square, so that it can meet the requirements of small size and easy processing. The etching pattern 1-3 is printed on the dielectric substrate 1-1 of the single-side metal cladding layer 1-2 by using a printed circuit process.

Etched patterns 1-3 are the design core of the single-negative material isolation plate 1, and its specific shape determines the performance of the isolation plate. In the present invention, the etching pattern 1-3 includes 4 groups of slots, and the above 4 groups of slots have a common center of the graphic, and these 4 groups of slots are centered on the center of the graphic and distributed from inside to outside. The innermost group of slots, that is, the first slot 1-3-1, includes four identical right-angled fan-shaped slots, and these four right-angled fan-shaped slots are symmetrically distributed around the center of the figure. A group of slots located in the second inner layer, that is, the second slot 1-3-2, is an I-shaped circular slot, and the I-shaped circular slot is composed of one circular slot and four identical T-shaped slots , the above-mentioned circular groove takes the center of the figure as the center of the circle, the lower ends of the four T-shaped grooves are all connected to the circular groove, and the four T-shaped grooves are symmetrically distributed around the center of the figure. A group of slots located in the second outer layer, that is, the third slot 1-3-3 is a gear-shaped slot, and the gear-shaped slot has 8 identical rectangular slots, and the 8 rectangular slots are centered on the figure. The center is symmetrically distributed. The fourth slot 1-3-4 in the outermost group of slots is a perfect circular slot with the center of the figure as the center.

The symmetrical centerlines of the four sets of slots in the above etched patterns 1-3 in the circumferential direction can be staggered from each other, but it can also be based on performance requirements. As shown in the preferred embodiment of the present invention, the four sets of slots in the etched patterns 1-3 are in The symmetrical center lines in the circumferential direction correspond to each other, that is, the central symmetrical lines of the four right-angle fan-shaped slots in the first slot 1-3-1 in the circumferential direction face southeast, southwest, northwest and northeast respectively. The center symmetry lines of the four T-shaped slots in the second slot 1-3-2 in the circumferential direction face the due east direction, the due south direction, the due west direction and the due north direction respectively. The center symmetry lines of the eight rectangular alveoli of the third slot 1-3-3 in the circumferential direction are respectively facing the directions of due east, southeast, due south, southwest, due west, northwest, and due north. northeast direction. The fourth slot 1-3-4 is a perfect circle, so its center line of symmetry in the circumferential direction can also be regarded as facing the above-mentioned directions.

A broadband high-isolation monopole sub-array antenna based on the above-mentioned single-negative material isolation board 1 , as shown in FIG. 2 , includes a ground plane 3 and two monopole sub-array elements 2 erected on the ground plane 3 . A single-negative material isolation plate 1 is arranged between the above two monopole sub-array elements 2 . In order to more effectively exert the isolation function of the isolation plate, in a preferred embodiment of the present invention, the single negative material isolation plate 1 is located at the midpoint of the two monopole sub-array elements 2 . When the height of the single-negative material isolation plate 1 is much smaller than the height of the monopole array antenna, two or more single-negative material isolation plates 1 can be stacked on the two monopole array elements 2 from top to bottom. between. When the number of monopole sub-array elements 2 on the same ground plate 3 is an even number of more than 2 (for example, when there are 4 monopole sub-array elements 2), then between every 2 monopole sub-array elements 2 Set up 1 single negative material isolation plate 1. The single-negative material isolation plate 1 is loaded on the monopole array antenna, thereby suppressing the mutual coupling of the array antenna, and finally obtaining an array antenna with broadband and high isolation. In the case of effectively suppressing mutual coupling, the operating frequency and bandwidth of the array do not change significantly after loading the single-negative material isolation plate 1 .

The above-mentioned single-negative material isolation plate 1 is composed of a dielectric substrate 1-1, a metal coating 1-2 covering one side of the dielectric substrate 1-1 and facing one of the monopole sub-arrays 2, and a metal coating 1-2 etched on the metal coating 1. -2 is composed of etching patterns 1-3. The above-mentioned single-negative material isolation board 1 is similar to a printed circuit board commonly used in the circuit field. The shape of the dielectric substrate 1-1 can be set according to design requirements, for example, it can be circular, polygonal or square, so as to meet the requirements of small size and easy processing. The etching pattern 1-3 is printed on the dielectric substrate 1-1 of the single-side metal cladding layer 1-2 by using a printed circuit process.

Etched patterns 1-3 are the design core of the single-negative material isolation plate 1, and its specific shape determines the performance of the isolation plate. In the present invention, the etching pattern 1-3 includes 4 groups of slots, and the above 4 groups of slots have a common center of the graphic, and these 4 groups of slots are centered on the center of the graphic and distributed from inside to outside. The innermost group of slots, that is, the first slot 1-3-1, includes four identical right-angled fan-shaped slots, and these four right-angled fan-shaped slots are symmetrically distributed around the center of the figure. A group of slots located in the second inner layer, that is, the second slot 1-3-2, is an I-shaped circular slot, and the I-shaped circular slot is composed of one circular slot and four identical T-shaped slots , the above-mentioned circular groove takes the center of the figure as the center of the circle, the lower ends of the four T-shaped grooves are all connected to the circular groove, and the four T-shaped grooves are symmetrically distributed around the center of the figure. A group of slots located in the second outer layer, that is, the third slot 1-3-3 is a gear-shaped slot, and the gear-shaped slot has 8 identical rectangular slots, and the 8 rectangular slots are centered on the figure. The center is symmetrically distributed. The fourth slot 1-3-4 in the outermost group of slots is a perfect circular slot with the center of the figure as the center.

The symmetrical centerlines of the four sets of slots in the above etched patterns 1-3 in the circumferential direction can be staggered from each other, but it can also be based on performance requirements. As shown in the preferred embodiment of the present invention, the four sets of slots in the etched patterns 1-3 are in The symmetrical center lines in the circumferential direction correspond to each other, that is, the central symmetrical lines of the four right-angle fan-shaped slots in the first slot 1-3-1 in the circumferential direction face southeast, southwest, northwest and northeast respectively. The center symmetry lines of the four T-shaped slots in the second slot 1-3-2 in the circumferential direction face the due east direction, the due south direction, the due west direction and the due north direction respectively. The center symmetry lines of the eight rectangular alveoli of the third slot 1-3-3 in the circumferential direction are respectively facing the directions of due east, southeast, due south, southwest, due west, northwest, and due north. northeast direction. Since the fourth slot 1-3-4 is perfectly circular, its center line of symmetry in the circumferential direction can also be regarded as facing the above-mentioned directions.

When the operating frequency f of the monopole array antenna is ₀ , the single negative material isolation plate 1 presents the characteristics of a single negative material near f ₀ (the dielectric constant ε and the magnetic permeability μ of the material have and only one is negative value, εμ<0). In a preferred embodiment of the present invention, a binary monopole subarray with an operating frequency f ₀ of 5 GHz is provided. Both the dielectric substrate 1-1 and its metal coating 1-2 are square. Dielectric substrate 1-1 is ArlonAD260A, with a dielectric constant of 2.6, a thickness of 1 mm, and a dimension W of 16 mm. Therefore, the size of the single negative material isolation plate 1 is only 16mm×16mm×1mm (0.26λ ₀ ×0.26λ ₀ ×0.02λ ₀ , where λ ₀ is the working wavelength of the array antenna). The side length a of the metal coating 1-2 is 15 mm. The width of the fourth slot 1-3-4 is 0.5mm, the width of the third slot 1-3-3 is 0.3mm, the width of the second slot 1-3-2 is 0.2mm, the width of the first slot 1 The radius of the right-angle fan-shaped groove in -3-1 is 0.8mm. The radius r ₄ of the fourth slot 1-3-4 is 7mm, the radius r ₃ of the third slot 1-3-3 is 6mm, the radius r ₂ of the second slot 1-3-2 is 2mm, the first The radius r ₁ of the slot 1-3-1 is 0.9 mm.

In this embodiment, the single-negative material isolation plate 1 exhibits the characteristics of a single-negative material near the operating frequency f ₀ (the dielectric constant ε and the magnetic permeability μ of the material have one and only one negative value, εμ<0) . Place the single negative material isolation plate 1 structure shown in Figure 1 in the TEM waveguide, the propagation direction of the electromagnetic wave is the y direction, and set the waveguide walls in the z direction and x direction as the perfect electric boundary (PEC) and the perfect magnetic boundary (PMC) respectively. ,As shown in Figure 3. The equivalent medium parameters (shown in Figure 4) of the single-negative material isolation plate 1 are obtained through HFSS 13 simulation calculation. It can be seen from the figure that the real part of the magnetic permeability Re(ε _eff ) has a negative peak at 5GHz, and the structure produces a magnetic resonance. In the range of 5GHz to 5.4GHz, Re(ε _eff ) is a negative value and Re(μ _eff ) maintains a positive value, and the isolation plate in this frequency band exhibits a single negative material characteristic. The 5GHz to 5.4GHz frequency band is the working isolation frequency band of the single negative material isolation board 1 .

Therefore, the working frequency f ₀ (5 GHz) of the monopole array in this embodiment just falls within the working isolation frequency band of the single negative material isolation plate 1 . FIG. 5 shows the S parameters of the embodiment of the present invention and the S parameters of the monopole subarray without the single negative material isolation plate 1 . It can be seen from the figure that when the single negative material isolation plate 1 is not loaded, the coupling coefficient of the binary monopole subarray reaches -12dB at the working frequency of 5GHz. After loading the SNG-CRR isolation board, the inter-unit coupling coefficient is -35dB at 5GHz without affecting the array operating frequency and bandwidth. After introducing the single-negative material isolation plate 1, the coupling degree between array units is reduced by 23dB, and the 20dB isolation bandwidth reaches 12%.

The above descriptions are the embodiments of the present invention, which are only used to help understand the technical solutions and core ideas of the present invention, and are not intended to limit the present invention. Those skilled in the art, without departing from the scope of the technical solution of the present invention, can use the above-mentioned methods and technical content to make some changes or modifications to equivalent embodiments with equivalent changes, but all those that do not depart from the technical solution of the present invention Content, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention. The content of this specification is not to limit the present invention.

Claims (7)

1. single-negative material division board, is characterized in that: by medium substrate (1-1), wherein the metal coating (1-2) of a side surface and the etched figure (1-3) that is etched in metal coating (1-2) are formed to overlay on medium substrate (1-1);

Above-mentioned etched figure (1-3) comprises 4 groups of lines of rabbet joint, and above-mentioned 4 groups of lines of rabbet joint have a common centre of figure, and these 4 groups of lines of rabbet joint are centered by centre of figure, and are embedded distribution from inside to outside; Wherein

One group of line of rabbet joint i.e. first line of rabbet joint (1-3-1) being positioned at innermost layer comprises 4 identical right angle fan grooves, the distribution and these 4 right angle fan grooves are centrosymmetric centered by centre of figure;

Be positioned at one group of line of rabbet joint i.e. second line of rabbet joint (1-3-2) of time internal layer for the circular line of rabbet joint of I-shaped, the circular line of rabbet joint of this I-shaped is made up of 1 circular recess and 4 identical T-slots, above-mentioned circular recess take centre of figure as the center of circle, the lower end of 4 T-slots is all connected with circular recess, the distribution and 4 T-slots are centrosymmetric centered by centre of figure;

Being positioned at time outer field one group of line of rabbet joint i.e. the 3rd line of rabbet joint (1-3-3) is the gear shape line of rabbet joint, and this gear shape line of rabbet joint has 8 identical rectangle teeth groove, the distribution and these 8 rectangle teeth groove are centrosymmetric centered by centre of figure;

Being positioned at outermost one group of line of rabbet joint i.e. the 4th line of rabbet joint (1-3-4) is the positive circular line of rabbet joint, and this positive circular line of rabbet joint take centre of figure as the center of circle.

2. single-negative material division board according to claim 1, is characterized in that: described etched figure (1-3) symmetrical center line is in a circumferential direction mutually corresponding, namely

4 right angle fan grooves of first line of rabbet joint (1-3-1) be sewn on centre symmetry line circumferentially respectively towards southeastern direction, southwestward, northwest to and northeastward;

4 T-slots of second line of rabbet joint (1-3-2) centre symmetry line in a circumferential direction respectively towards direction, due east, Due South to, positive west to and direct north;

8 rectangle teeth groove of the 3rd line of rabbet joint (1-3-3) centre symmetry line in a circumferential direction respectively towards direction, due east, southeastern direction, Due South to, southwestward, positive west to, northwest to, direct north and northeastward.

3. single-negative material division board according to claim 1, is characterized in that: described medium substrate (1-1) is in square.

4. wideband high-isolation monopole array antenna, comprises ground plate (3) and is erected on 2 monopole array elements (2) on ground plate (3); It is characterized in that: between above-mentioned 2 monopole array elements (2), be provided with single-negative material division board (1);

Should by medium substrate (1-1), overlay on medium substrate (1-1) wherein side surface forming towards the metal coating (1-2) of one of them monopole array element (2) and the etched figure (1-3) that is etched in metal coating (1-2);

Above-mentioned etched figure (1-3) comprises 4 groups of lines of rabbet joint, and above-mentioned 4 groups of lines of rabbet joint have a common centre of figure, and these 4 groups of lines of rabbet joint are centered by centre of figure, and are embedded distribution from inside to outside; Wherein

One group of line of rabbet joint i.e. first line of rabbet joint (1-3-1) being positioned at innermost layer comprises 4 identical right angle fan grooves, the distribution and these 4 right angle fan grooves are centrosymmetric centered by centre of figure;

Be positioned at one group of line of rabbet joint i.e. second line of rabbet joint (1-3-2) of time internal layer for the circular line of rabbet joint of I-shaped, the circular line of rabbet joint of this I-shaped is made up of 1 circular recess and 4 identical T-slots, above-mentioned circular recess take centre of figure as the center of circle, the lower end of 4 T-slots is all connected with circular recess, the distribution and 4 T-slots are centrosymmetric centered by centre of figure;

Being positioned at time outer field one group of line of rabbet joint i.e. the 3rd line of rabbet joint (1-3-3) is the gear shape line of rabbet joint, and this gear shape line of rabbet joint has 8 identical rectangle teeth groove, the distribution and these 8 rectangle teeth groove are centrosymmetric centered by centre of figure;

Being positioned at outermost one group of line of rabbet joint i.e. the 4th line of rabbet joint (1-3-4) is the positive circular line of rabbet joint, and this positive circular line of rabbet joint take centre of figure as the center of circle.

5. single-negative material division board (1) according to claim 4, is characterized in that: described etched figure (1-3) symmetrical center line is in a circumferential direction mutually corresponding, namely

4 right angle fan grooves of first line of rabbet joint (1-3-1) be sewn on centre symmetry line circumferentially respectively towards southeastern direction, southwestward, northwest to and northeastward;

4 T-slots of second line of rabbet joint (1-3-2) centre symmetry line in a circumferential direction respectively towards direction, due east, Due South to, positive west to and direct north;

8 rectangle teeth groove of the 3rd line of rabbet joint (1-3-3) centre symmetry line in a circumferential direction respectively towards direction, due east, southeastern direction, Due South to, southwestward, positive west to, northwest to, direct north and northeastward.

6. the single-negative material division board (1) according to claim 4 or 5, is characterized in that: described single-negative material division board (1) is in the midpoint of 2 monopole array elements (2).

7. single-negative material division board (1) according to claim 4, is characterized in that: described medium substrate (1-1) is in square.