Broadband high-gain magnetoelectric dipole filtering antenna array

Abstract

The invention discloses a broadband high-gain magnetoelectric dipole filtering antenna array, which comprises an upper layer metal patch, an upper layer dielectric substrate, a middle layer metal patch, a lower layer dielectric substrate and a lower layer metal patch, each group of metal sheets comprises four same fan-shaped metal sheets and a middle rectangular metal sheet, a rectangular angle is cut off from each of two ends of an arc of each fan-shaped metal sheet to realize the broadband characteristic, and an L-shaped gap is etched on each fan-shaped metal sheet to realize the filtering performance; a metal through hole is etched in each fan-shaped metal sheet and each rectangular metal sheet respectively; the metal through holes penetrate through the upper-layer dielectric substrate, the metal through holes in the fan-shaped metal sheets penetrate through the upper-layer metal patch to the middle-layer metal patch, and the metal through holes in the middle rectangular metal sheets penetrate through the upper-layer metal patch to the lower-layer metal patch; the lower metal patch is a one-to-four power divider composed of microstrip lines. The antenna has the advantages of being wide in frequency band, high in gain, good in filtering characteristic and small in size.

Description

Technical Field

[0001] The invention relates to the technical field of filtering antennas, in particular to a broadband high-gain magneto-electric dipole filtering antenna array. Background Art

[0002] In order to meet the needs of rapidly developing and increasingly complex wireless communication systems, antennas with wide bandwidth, high gain and filtering characteristics are indispensable. In practical applications, broadband high-gain filtering antennas can effectively solve the drawbacks of narrow bandwidth and low gain that limit the working performance of wireless communication systems. At the same time, the filtering antenna combines the stable in-band radiation function of traditional antennas with the ability of filters to suppress and eliminate clutter out of the band, which can greatly reduce the complexity and volume size of the entire RF front-end architecture, and is conducive to the miniaturization and high integration of communication systems. Taking advantage of the wide operating frequency band, symmetrical radiation pattern, low back lobe level and low cross-polarization level of the magnetoelectric dipole antenna, and the fact that the magnetoelectric dipole antenna itself has a low-frequency radiation zero point, the filtering function is integrated into the magnetoelectric dipole antenna to realize the magnetoelectric dipole filtering antenna, which can achieve high gain and wide bandwidth of the filtering antenna, and can more effectively deal with the problem of shortage of electromagnetic wave spectrum resources.

[0003] Usually, the directivity and gain of a single antenna unit are relatively limited, which makes it difficult to meet the needs of most medium and long-distance communication scenarios. Highly directional beams can be achieved by increasing the electrical size of the antenna radiation aperture. One of the most commonly used methods is to arrange several antenna units according to a certain electrical distribution and spatial position distribution to form an antenna array. The radiation field of the array antenna is equal to the vector superposition of the radiation fields of each unit antenna in the far field. In order to obtain the desired radiation pattern, the vector fields of the units need to be additively superimposed in the specified direction and destructively superimposed in other directions to reduce signal leakage and spatial interference with other systems.

[0004] However, the current magnetoelectric dipole filtering antenna still has problems such as narrow antenna communication band, poor filtering performance, low gain, complex structure and difficulty in implementation. Summary of the invention

[0005] The object of the present invention is to provide a broadband high-gain magnetoelectric dipole filtering antenna array which is simple in structure and easy to realize, and the antenna has a wide communication frequency band, good filtering performance, and a stable and high gain.

[0006] The technical solution to achieve the purpose of the present invention is: a broadband high-gain magnetoelectric dipole filter antenna array, including an upper metal patch, an upper dielectric substrate, an intermediate metal patch, a lower dielectric substrate, and a lower metal patch arranged layer by layer from top to bottom, wherein:

[0007] The upper metal patch is composed of four groups of identical metal sheets arranged in a field shape; the main body of each group of metal sheets includes four identical fan-shaped metal sheets and a middle rectangular metal sheet, a rectangular corner is cut off at both ends of the arc of each fan-shaped metal sheet to achieve broadband characteristics, an L-shaped gap is etched on each fan-shaped metal sheet to achieve filtering performance, and a metal through hole is etched on each fan-shaped metal sheet and rectangular metal sheet;

[0008] The upper dielectric substrate is penetrated by metal through holes, wherein the metal through holes on the fan-shaped metal sheet penetrate the upper metal patch to the middle metal patch, and the metal through holes on the middle rectangular metal sheet penetrate the upper metal patch to the lower metal patch;

[0009] The middle layer metal patch is spread over the entire upper surface of the lower dielectric substrate, the metal through holes on the fan-shaped metal sheet penetrate the middle layer metal patch to form a circular gap, and the metal through holes on the middle rectangular metal sheet are formed at the orthographic projection position to form a circular gap with a larger diameter;

[0010] The lower dielectric substrate is penetrated by the metal through-holes on the middle rectangular metal sheet;

[0011] The lower metal patch is a 1-to-4 power divider composed of microstrip lines.

[0012] Furthermore, the upper metal patch includes a first group of metal sheets arranged at the upper left corner, a second group of metal sheets at the upper right corner, a third group of metal sheets at the lower left corner and a fourth group of metal sheets at the lower right corner.

[0013] Furthermore, the four sector-shaped metal sheets in the first group of metal sheets are formed by cutting the same circle horizontally and vertically into four parts, namely, upper left, upper right, lower left and lower right, which are respectively referred to as the first to fourth sector-shaped metal sheets;

[0014] A cross-shaped gap is arranged between the first to fourth metal sheets, which intersects horizontally and vertically. The middle rectangular metal sheet arranged in the vertical gap is called the fifth rectangular metal sheet.

[0015] Further, the first to second rectangular corners are cut off at both ends of the arc of the first sector-shaped metal sheet, the third to fourth rectangular corners are cut off at both ends of the arc of the second sector-shaped metal sheet, the fifth to sixth rectangular corners are cut off at both ends of the arc of the third sector-shaped metal sheet, and the seventh to eighth rectangular corners are cut off at both ends of the arc of the fourth sector-shaped metal sheet;

[0016] Etching first to fourth L-shaped gaps and first to fourth metal through holes respectively on the first to fourth sector-shaped metal sheets;

[0017] A fifth metal through hole is etched at a lower position of the fifth rectangular metal sheet.

[0018] Further, the first to fourth metal through holes in the first group of metal sheets are the first group of metal through holes, and the metal through holes on the fan-shaped metal sheets in the second to fourth groups of metal sheets are the second to fourth groups of metal through holes respectively;

[0019] The metal through holes on the rectangular metal sheets in the first to fourth groups of metal sheets are the fifth to eighth metal through holes, respectively;

[0020] The first to fourth groups of metal through holes connect the upper metal patch and the middle metal patch, and the fifth to eighth metal through holes connect the upper metal patch and the lower metal patch.

[0021] Further, twenty circular gaps are etched in the middle layer metal patch, the first to fourth groups of metal through holes penetrate the middle layer metal patch to form 16 circular gaps, and the fifth to eighth circular gaps are etched at the orthographic projection positions of the fifth to eighth metal through holes;

[0022] The radius of the fifth to eighth circular gaps is greater than the radius of the fifth to eighth metal through holes, and the center positions of the circular gaps and the metal through holes at corresponding positions are the same.

[0023] Furthermore, the lower metal patch is a 1-to-4 power divider composed of microstrip lines, and the 1-to-4 power divider as a whole is composed of 8 parts, namely a sixth metal sheet, a seventh metal sheet, an eighth metal sheet, a ninth metal sheet, a tenth metal sheet, an eleventh metal sheet, a twelfth metal sheet and a thirteenth metal sheet;

[0024] One end of the sixth metal sheet is connected to the energy input port, and the other end thereof is branched into an eighth metal sheet and a ninth metal sheet through the seventh metal sheet;

[0025] The eighth metal sheet and the ninth metal sheet have the same structure and are symmetrical from top to bottom. The eighth metal sheet consists of a lower rectangular metal sheet and an upper rectangular metal sheet, and a first triangle is etched at the lower left corner of the lower rectangular metal sheet; the ninth metal sheet consists of an upper rectangular metal sheet and a lower rectangular metal sheet, and a second triangle is etched at the upper left corner;

[0026] The tenth metal sheet, the eleventh metal sheet, the twelfth metal sheet and the thirteenth metal sheet have the same structure, wherein the tenth metal sheet is symmetrical with the eleventh metal sheet, and the twelfth metal sheet is symmetrical with the thirteenth metal sheet;

[0027] The tenth metal sheet is composed of the first right rectangular metal sheet and the first left rectangular metal sheet, the third triangle is etched at the upper right corner of the first right rectangular metal sheet, the fourth triangle is etched at the upper left corner of the first left rectangular metal sheet, and the fifth metal through hole is etched at the lower left corner; the eleventh metal sheet is composed of the second left rectangular metal sheet and the second right rectangular metal sheet, the fifth triangle is etched at the upper left corner of the second left rectangular metal sheet, the sixth triangle is etched at the upper right corner of the second right rectangular metal sheet, and the sixth metal through hole is etched at the lower right corner; the twelfth metal sheet is composed of the third right rectangular metal sheet and the third left rectangular metal sheet, the seventh triangle is etched at the lower right corner of the third right rectangular metal sheet, the eighth triangle is etched at the upper left corner of the third left rectangular metal sheet, and the seventh metal through hole is etched at the lower left corner; the thirteenth metal sheet is composed of the fourth left rectangular metal sheet and the fourth right rectangular metal sheet, the ninth triangle is etched at the lower left corner of the fourth left rectangular metal sheet, the tenth triangle is etched at the upper right corner of the fourth right rectangular metal sheet, and the eighth metal through hole is etched at the lower right corner.

[0028] Furthermore, energy is input by the sixth metal sheet, transmitted to the tenth to thirteenth metal sheets through the seventh, eighth and ninth metal sheets, and then transmitted through the fifth to eighth metal through holes through the fifth to eighth circular gaps to the first to fourth groups of metal sheets to radiate outward. The middle layer metal patch is the common floor for the antenna and the power divider, and the feed line is located on the lower layer metal patch.

[0029] Furthermore, the lower metal patch is not a vertically symmetrical structure. The eighth metal sheet is symmetrical with the ninth metal sheet, the tenth metal sheet is symmetrical with the eleventh metal sheet, the twelfth metal sheet is symmetrical with the thirteenth metal sheet, the first right rectangular metal sheet in the tenth metal sheet, the second left rectangular metal sheet in the eleventh metal sheet, the third right rectangular metal sheet in the twelfth metal sheet, and the fourth left rectangular metal sheet in the thirteenth metal sheet are symmetrical in the vertical direction, and the third left rectangular metal sheet in the twelfth metal sheet and the fourth right rectangular metal sheet in the thirteenth metal sheet are obtained by translating the first left rectangular metal sheet in the tenth metal sheet and the second right rectangular metal sheet in the eleventh metal sheet downward.

[0030] Furthermore, the thickness of the upper dielectric substrate is 1.57 mm, the thickness of the lower dielectric substrate is 0.254 mm, and the overall height of the antenna is 1.824 mm.

[0031] Compared with the prior art, the present invention has the following significant advantages: (1) a rectangular corner is cut off at each end of the circular arc of the sector-shaped metal sheet to achieve broadband characteristics, and an L-shaped slot is etched to achieve filtering performance; (2) a wider impedance bandwidth is obtained by adopting a metal through hole and a circular slot via feeding method; (3) a one-to-four power divider composed of microstrip lines is adopted to enable the antenna to achieve high gain performance, a stable radiation pattern, and a more concentrated radiation direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1a It is a side view of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0033] Figure 1b It is a circuit diagram of an upper metal patch of a broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0034] Figure 1c It is a top view of the upper dielectric layer substrate of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0035] Figure 1d The invention discloses a circuit diagram of a middle layer metal patch of a broadband high-gain magneto-electric dipole filtering antenna array.

[0036] Figure 1e It is a top view of the lower dielectric substrate of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0037] Figure 1f The invention discloses a circuit diagram of a lower metal patch of a broadband high-gain magneto-electric dipole filtering antenna array.

[0038] Figure 1g It is a top view of the antenna array of the present invention from the upper dielectric layer substrate to the lower metal patch.

[0039] Figure 2 It is the S11 curve diagram of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0040] Figure 3 It is a gain curve diagram of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention.

[0041] Figure 4 It is the E-plane radiation pattern of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention at 24.2 GHz.

[0042] Figure 5 It is the H-plane radiation pattern of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention at 24.2 GHz.

[0043] Figure 6 It is the E-plane radiation pattern of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention at 30 GHz.

[0044] Figure 7 It is the H-plane radiation pattern of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention at 30 GHz. DETAILED DESCRIPTION

[0045] The broadband high-gain magnetoelectric dipole filtering antenna array of the present invention has the characteristics of wide bandwidth, stable and high gain, and good filtering characteristics. In order to reduce the influence of the microstrip line on the antenna performance, it is used as the bottom metal patch to make the antenna performance more stable. By cutting off a rectangular corner at both ends of the arc of each sector-shaped metal sheet, the antenna has a wider impedance bandwidth, and etching an L-shaped gap on each sector-shaped metal sheet makes the antenna have better filtering characteristics.

[0046] In conjunction with FIG1 , a broadband high-gain magnetoelectric dipole filtering antenna array of the present invention includes an upper metal patch 1, an upper dielectric substrate 2, an intermediate metal patch 3, a lower dielectric substrate 4, and a lower metal patch 5, which are arranged layer by layer from top to bottom, wherein:

[0047] The upper metal patch 1 is composed of four groups of identical metal sheets arranged in a field shape; the main body of each group of metal sheets includes four identical fan-shaped metal sheets and a middle rectangular metal sheet, a rectangular corner is cut off at both ends of the arc of each fan-shaped metal sheet to achieve broadband characteristics, an L-shaped gap is etched on each fan-shaped metal sheet to achieve filtering performance, and a metal through hole is etched on each fan-shaped metal sheet and rectangular metal sheet respectively;

[0048] The upper dielectric substrate 2 is penetrated by metal through holes, wherein the metal through holes on the fan-shaped metal sheet penetrate the upper metal patch 1 to the middle metal patch 3, and the metal through holes on the middle rectangular metal sheet penetrate the upper metal patch 1 to the lower metal patch 5;

[0049] The middle layer metal patch 3 is laid flat on the upper surface of the entire lower dielectric substrate 4, the metal through holes on the fan-shaped metal sheet penetrate the middle layer metal patch 3 to form a circular gap, and the metal through holes on the middle rectangular metal sheet are formed at the orthographic projection position to form a circular gap with a larger diameter;

[0050] The lower dielectric substrate 4 is penetrated by the metal through-holes on the middle rectangular metal sheet;

[0051] The lower metal patch 5 is a 1-to-4 power divider composed of microstrip lines.

[0052] As a specific example, the upper metal patch 1 includes a first group of metal sheets 11 arranged at the upper left corner, a second group of metal sheets 12 at the upper right corner, a third group of metal sheets 13 at the lower left corner and a fourth group of metal sheets 14 at the lower right corner.

[0053] As a specific example, the four sector-shaped metal sheets in the first group of metal sheets 11 are formed by cutting the same circle horizontally and vertically, and are divided into four parts: upper left, upper right, lower left, and lower right, which are respectively called first to fourth sector-shaped metal sheets 111, 112, 113, and 114;

[0054] Cross-shaped gaps are arranged between the first to fourth metal sheets 111 , 112 , 113 , 114 , and a middle rectangular metal sheet 115 is arranged in the longitudinal gap.

[0055] As a specific example, the first to second rectangular corners 1111 and 1112 are cut off at both ends of the arc of the first fan-shaped metal sheet 111, the third to fourth rectangular corners 1121 and 1122 are cut off at both ends of the arc of the second fan-shaped metal sheet 112, the fifth to sixth rectangular corners 1131 and 1132 are cut off at both ends of the arc of the third fan-shaped metal sheet 113, and the seventh to eighth rectangular corners 1141 and 1142 are cut off at both ends of the arc of the fourth fan-shaped metal sheet 114.

[0056] Etching first to fourth L-shaped gaps 1113, 1123, 1133, 1143 and first to fourth metal through holes 211, 212, 213, 214 on the first to fourth sector-shaped metal sheets 111, 112, 113, 114 respectively;

[0057] A fifth metal via 25 is etched at a lower position of the fifth rectangular metal sheet 115 .

[0058] As a specific example, the first to fourth metal through holes 211, 212, 213, 214 in the first group of metal sheets 11 are the first group of metal through holes 21, and the metal through holes on the fan-shaped metal sheets in the second to fourth groups of metal sheets 12, 13, 14 are the second to fourth groups of metal through holes 22, 23, 24 respectively;

[0059] The metal through holes on the rectangular metal sheets in the first to fourth groups of metal sheets 11, 12, 13, 14 are the fifth to eighth metal through holes 25, 26, 27, 28, respectively;

[0060] The first to fourth groups of metal through holes 21 , 22 , 23 , 24 connect the upper metal patch 1 and the middle metal patch 3 , and the fifth to eighth metal through holes 25 , 26 , 27 , 28 connect the upper metal patch 1 and the lower metal patch 5 .

[0061] As a specific example, twenty circular gaps are etched in the middle layer metal patch 3, the first to fourth groups of metal through holes 21, 22, 23, 24 penetrate the middle layer metal patch 3 to form 16 circular gaps, and the fifth to eighth circular gaps 31, 32, 33, 34 are etched at the orthographic projection positions of the fifth to eighth metal through holes 25, 26, 27, 28;

[0062] The radius of the fifth to eighth circular slots 31 , 32 , 33 , 34 is greater than the radius of the fifth to eighth metal through holes 25 , 26 , 27 , 28 , and the center positions of the circular slots and the corresponding metal through holes are the same.

[0063] As a specific example, the lower metal patch 5 is a 1-to-4 power divider composed of microstrip lines, and the 1-to-4 power divider as a whole is composed of 8 parts, namely a sixth metal sheet 51, a seventh metal sheet 52, an eighth metal sheet 53, a ninth metal sheet 54, a tenth metal sheet 55, an eleventh metal sheet 56, a twelfth metal sheet 57 and a thirteenth metal sheet 58;

[0064] One end of the sixth metal sheet 51 is connected to the energy input port, and the other end thereof is branched into an eighth metal sheet 53 and a ninth metal sheet 54 through the seventh metal sheet 52;

[0065] The eighth metal sheet 53 and the ninth metal sheet 54 have the same structure and are symmetrical from top to bottom. The eighth metal sheet 53 consists of a lower rectangular metal sheet 531 and an upper rectangular metal sheet 532, and a first triangle 5311 is etched at the lower left corner of the lower rectangular metal sheet 531; the ninth metal sheet 54 consists of an upper rectangular metal sheet 541 and a lower rectangular metal sheet 542, and a second triangle 5411 is etched at the upper left corner;

[0066] The tenth metal sheet 55, the eleventh metal sheet 56, the twelfth metal sheet 57 and the thirteenth metal sheet 58 have the same structure, wherein the tenth metal sheet 55 and the eleventh metal sheet 56 are bilaterally symmetrical, and the twelfth metal sheet 57 and the thirteenth metal sheet 58 are bilaterally symmetrical;

[0067] The tenth metal sheet 55 is composed of a first right rectangular metal sheet 551 and a first left rectangular metal sheet 552. The first right rectangular metal sheet 551 is etched with a third triangle 5511 at the upper right corner, the first left rectangular metal sheet 552 is etched with a fourth triangle 5521 at the upper left corner, and a fifth metal through hole 25 is etched at the lower left corner; the eleventh metal sheet 56 is composed of a second left rectangular metal sheet 561 and a second right rectangular metal sheet 562. The second left rectangular metal sheet 561 is etched with a fifth triangle 5611 at the upper left corner, the second right rectangular metal sheet 562 is etched with a sixth triangle 5621 at the upper right corner, and a sixth metal through hole 26 is etched at the lower right corner; The twelfth metal sheet 57 is composed of a third right rectangular metal sheet 571 and a third left rectangular metal sheet 572, the seventh triangle 5711 is etched at the lower right corner of the third right rectangular metal sheet 571, the eighth triangle 5721 is etched at the upper left corner of the third left rectangular metal sheet 572, and the seventh metal through hole 27 is etched at the lower left corner; the thirteenth metal sheet 58 is composed of a fourth left rectangular metal sheet 581 and a fourth right rectangular metal sheet 582, the ninth triangle 5811 is etched at the lower left corner of the fourth left rectangular metal sheet 581, the tenth triangle 5821 is etched at the upper right corner of the fourth right rectangular metal sheet 582, and the eighth metal through hole 28 is etched at the lower right corner.

[0068] As a specific example, energy is input by the sixth metal sheet 51, transmitted to the tenth to thirteenth metal sheets 55, 56, 57, 58 through the seventh metal sheet 52, the eighth metal sheet 53 and the ninth metal sheet 54, and then transmitted through the fifth to eighth metal through holes 25, 26, 27, 28 through the fifth to eighth circular gaps 31, 32, 33, 34 to the first to fourth groups of metal sheets 11, 12, 13, 14 to radiate outward. The middle layer metal patch 3 is the common floor for the antenna and the power divider, and the feed line is located on the lower layer metal patch 5.

[0069] As a specific example, the lower metal patch 5 is not a vertically symmetrical structure, the eighth metal sheet 53 and the ninth metal sheet 54 are vertically symmetrical, the tenth metal sheet 55 and the eleventh metal sheet 56 are left-right symmetrical, the twelfth metal sheet 57 and the thirteenth metal sheet 58 are left-right symmetrical, the first right rectangular metal sheet 551 in the tenth metal sheet 55, the second left rectangular metal sheet 561 in the eleventh metal sheet 56 and the third right rectangular metal sheet 571 in the twelfth metal sheet 57, and the fourth left rectangular metal sheet 581 in the thirteenth metal sheet 58 are vertically symmetrical, the third left rectangular metal sheet 572 in the twelfth metal sheet 57 and the fourth right rectangular metal sheet 582 in the thirteenth metal sheet 58 are obtained by translating the first left rectangular metal sheet 552 in the tenth metal sheet 55 and the second right rectangular metal sheet 562 in the eleventh metal sheet 56 downward.

[0070] As a specific example, the thickness of the upper dielectric substrate 2 is 1.57 mm, the thickness of the lower dielectric substrate 4 is 0.254 mm, and the overall height of the antenna is 1.824 mm.

[0071] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0072] Example

[0073] In conjunction with Figure 1, the broadband high-gain circularly polarized antenna array of the present invention includes an upper metal patch 1, an upper dielectric substrate 2, an intermediate metal patch 3, a lower dielectric substrate 4, and a lower metal patch 5; the upper metal patch 1 is composed of four groups of completely identical first to fourth groups of metal sheets 11, 12, 13, and 14, including a metal sheet 11 arranged at the upper left corner, a metal sheet 12 at the upper right corner, a metal sheet 13 at the lower left corner, and a metal sheet 14 at the lower right corner; taking the metal sheet 11 at the upper left corner as an example, the first to fourth fan-shaped metal sheets 111, 112, 113, and 114 are completely identical and centrally symmetrical, the first fan-shaped metal sheet 111 is at the upper left corner, the second fan-shaped metal sheet 112 is at the upper right corner, and the third fan-shaped metal sheet 113 is at the upper right corner. The metal sheet 113 is at the lower left corner, the fourth fan-shaped metal sheet 114 is at the lower right corner, and the fifth rectangular metal sheet 115 is placed between the first to fourth fan-shaped metal sheets 111, 112, 113, and 114; taking the first fan-shaped metal sheet 111 as an example, the first rectangular corner 1111 and the second rectangular corner 1112 are cut off at both ends of the arc of the first fan-shaped metal sheet 111 to achieve broadband characteristics, an L-shaped gap 1113 is etched on the first fan-shaped metal sheet 111 to achieve filtering performance, and a first metal through hole 211 is etched near the center of the first fan-shaped metal sheet 111, and a fifth metal through hole 25 is etched on the fifth rectangular metal sheet 115; the first to fourth groups of metal through holes 21, 22, 23, 24, the fifth ... Eight metal through holes 25, 26, 27, 28 penetrate the upper dielectric substrate 2, wherein the first to fourth groups of metal through holes 21, 22, 23, 24 connect the upper metal patch 1 and the middle metal patch 3, and the fifth to eighth metal through holes 25, 26, 27, 28 connect the upper metal patch 1 and the lower metal patch 5; the middle metal patch 3 flattens the upper surface of the entire lower dielectric substrate 4, and etches circular gaps corresponding to the first to fourth groups of metal through holes 21, 22, 23, 24 and the fifth to eighth circular gaps 31, 32, 33, 34, wherein the radius of the fifth to eighth circular gaps 31, 32, 33, 34 is greater than that of the fifth to eighth metal through holes 25, 26, 27, 28, the two circles have the same center; the fifth to eighth metal through holes 25, 26, 27, 28 penetrate the lower dielectric substrate 4, and are used to connect the upper metal patch 1 and the lower metal patch 5; the lower metal patch 5 is composed of the sixth to thirteenth metal sheets 51, 52, 53, 54, 55, 56, 57, 58; the eighth metal sheet 53 and the ninth metal sheet 54 have the same structure and are symmetrical up and down. The eighth metal sheet 53 is composed of a lower rectangular metal sheet 531 and an upper rectangular metal sheet 532, and a first triangle 5311 is etched at the lower left corner of the lower rectangular metal sheet 531; the ninth metal sheet 54 is composed of an upper rectangular metal sheet 541 and a lower rectangular metal sheet 542, and a second triangle 5411 is etched at the upper left corner;The tenth metal sheet 55, the eleventh metal sheet 56, the twelfth metal sheet 57 and the thirteenth metal sheet 58 have the same structure. The tenth metal sheet 55 and the eleventh metal sheet 56 are symmetrical, and the twelfth metal sheet 57 and the thirteenth metal sheet 58 are symmetrical. The tenth metal sheet 55 is composed of a first right rectangular metal sheet 551 and a first left rectangular metal sheet 552. The first right rectangular metal sheet 551 has a third triangle 5511 etched in the upper right corner, the first left rectangular metal sheet 552 has a fourth triangle 5521 etched in the upper left corner, and a fifth metal through hole 25 is etched in the lower left corner. The eleventh metal sheet 56 is composed of a second left rectangular metal sheet 561 and a second right rectangular metal sheet 562. The second left rectangular metal sheet 561 has a fifth triangle 561 etched in the upper left corner. 1. The sixth triangle 5621 is etched at the upper right corner of the second right rectangular metal sheet 562, and the sixth metal through hole 26 is etched at the lower right corner; the twelfth metal sheet 57 is composed of the third right rectangular metal sheet 571 and the third left rectangular metal sheet 572, the seventh triangle 5711 is etched at the lower right corner of the third right rectangular metal sheet 571, the eighth triangle 5721 is etched at the upper left corner of the third left rectangular metal sheet 572, and the seventh metal through hole 27 is etched at the lower left corner; the thirteenth metal sheet 58 is composed of the fourth left rectangular metal sheet 581 and the fourth right rectangular metal sheet 582, the ninth triangle 5811 is etched at the lower left corner of the fourth left rectangular metal sheet 581, the tenth triangle 5821 is etched at the upper right corner of the fourth right rectangular metal sheet 582, and the eighth metal through hole 28 is etched at the lower right corner. ;

[0074] The design process of the present invention is as follows:

[0075] (i) The thickness of the upper dielectric substrate 2 is 1.57 mm and the dielectric constant is 2.2, and the thickness of the lower dielectric substrate 4 is 0.254 mm and the dielectric constant is 2.2.

[0076] (ii) The upper metal patch 1 realizes broadband characteristics by cutting off a rectangular corner at both ends of the arc of each sector-shaped metal sheet, and etching an L-shaped gap on each sector-shaped metal sheet to enhance the filtering performance of the antenna;

[0077] (iii) The lower metal patch 5 is a one-to-four power divider composed of microstrip lines. By arranging four groups of identical metal patches into a 2×2 structure, the designed antenna has a high gain characteristic and makes the radiation direction more concentrated.

[0078] Combination Figure 1a to Figure 1g In the broadband high-gain magnetoelectric dipole filtering antenna array of the present invention, the material of the dielectric substrate 2 is Roger RT 5880, and the dielectric constant ε r =2.2, thickness H1 =1.57mm, size 18.3mm×22.75mm×1.57mm, material of dielectric substrate 5 is Roger RT5880, dielectric constant ε r=2.2, thickness H2 =0.254mm, size is 19.72mm×22.75mm×0.254mm; the rectangular metal sheet 115 located at the center of the upper metal patch 1 is 3mm long and 0.75mm wide, the circular gaps 25, 26, 27, 28 on the rectangular metal sheet 115 have a diameter of 0.48mm, the circular gaps 211, 212, 213, 214 on the fan-shaped metal sheets 111, 112, 113, 114 in the upper metal patch 1 have a diameter of 1mm, and the rectangular corners 1111, 1112, 1121, 1122, 1131, 1132, 11 41, 1142 are 1.2mm long and 0.7mm wide, the L-shaped gaps 1113, 1123, 1133, 1143 are 1.6mm long and 0.12mm wide; the diameters of the metal through holes 21, 22, 23, 24 and the metal through holes 25, 26, 27, 28 that penetrate the upper dielectric substrate 2 are 1mm and 0.48mm respectively, the diameters of the circular gaps 21, 22, 23, 24 and the circular gaps 31, 32, 33, 34 on the middle metal patch are 1mm and 0.84mm respectively, and the diameter of the metal through holes 25, 26, 27, 28 that penetrate the lower dielectric substrate 4 is 0.48mm.

[0079] Figure 2 is the S of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention. 11 The curve diagram shows that the operating frequency band of the broadband high-gain magneto-electric dipole filter antenna array is 16.79-34.4 GHz, the absolute bandwidth is 17.61 GHz, and the relative bandwidth is 68.8%. The antenna has a relatively wide operating frequency band.

[0080] Figure 3 It is a curve diagram of the gain variation of the broadband high-gain magnetoelectric dipole filtering antenna array of the present invention with frequency, which produces two radiation zero points at 14.2GHz and 36.2GHz respectively, with high and stable in-band gain and an average gain of 13.2dBi, which has higher gain than a single filtering antenna unit.

[0081] Figure 4 , Figure 5 It is the normalized radiation pattern of the E plane and the H plane of the broadband high-gain magneto-electric dipole filtering antenna array of the present invention at 24.2GHz. The broadband high-gain magneto-electric dipole filtering antenna array has a stable radiation pattern and a low cross-polarization level.

[0082] Figure 6 , Figure 7 The invention discloses a normalized radiation pattern of the E-plane and the H-plane of the broadband high-gain magneto-electric dipole filtering antenna array at 30 GHz. The broadband high-gain magneto-electric dipole filtering antenna array has a stable radiation pattern and a low cross-polarization level.

[0083] In summary, the broadband high-gain magnetoelectric dipole filter antenna array of the present invention has a wide frequency band and high gain, and has stable gain and radiation pattern within the working frequency band, a simple structure, and is easy to process and realize.

Claims

1. A broadband high-gain magneto-electric dipole filtering antenna array, characterized in that: The invention comprises an upper metal patch (1), an upper dielectric substrate (2), an intermediate metal patch (3), a lower dielectric substrate (4), and a lower metal patch (5) which are arranged layer by layer from top to bottom, wherein: The upper metal patch (1) is composed of four groups of completely identical metal sheets arranged in a field shape; the main body of each group of metal sheets includes four identical fan-shaped metal sheets and a middle rectangular metal sheet, a rectangular corner is cut off at both ends of the arc of each fan-shaped metal sheet to achieve broadband characteristics, an L-shaped gap is etched on each fan-shaped metal sheet to achieve filtering performance, and a metal through hole is etched on each fan-shaped metal sheet and the rectangular metal sheet; The upper dielectric substrate (2) is penetrated by metal through holes, wherein the metal through holes on the fan-shaped metal sheet penetrate from the upper metal patch (1) to the middle metal patch (3), and the metal through holes on the middle rectangular metal sheet penetrate from the upper metal patch (1) to the lower metal patch (5); The intermediate metal patch (3) is laid flat on the entire upper surface of the lower dielectric substrate (4); the metal through-holes on the fan-shaped metal sheet penetrate the intermediate metal patch (3) to form a circular gap; and a circular gap with a larger diameter is formed at the orthographic projection position of the metal through-holes on the middle rectangular metal sheet; The lower dielectric substrate (4) is penetrated by the metal through-holes on the middle rectangular metal sheet; The lower metal patch (5) is a 1-to-4 power divider composed of microstrip lines.

2. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 1, characterized in that: The upper metal patch (1) comprises a first group of metal sheets (11) arranged at the upper left corner, a second group of metal sheets (12) at the upper right corner, a third group of metal sheets (13) at the lower left corner and a fourth group of metal sheets (14) at the lower right corner.

3. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 2, characterized in that: The four sector-shaped metal sheets in the first group of metal sheets (11) are formed by cutting the same circle horizontally and vertically to be divided into four parts, namely, upper left, upper right, lower left, and lower right, which are respectively referred to as first to fourth sector-shaped metal sheets (111, 112, 113, 114); A cross-shaped gap is arranged between the first to fourth metal sheets (111, 112, 113, 114) in a horizontal and vertical direction, and the middle rectangular metal sheet is arranged in the vertical gap and is called the fifth rectangular metal sheet (115).

4. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 3, characterized in that: The first and second rectangular corners (1111, 1112) are cut off at both ends of the circular arc of the first sector-shaped metal sheet (111), the third and fourth rectangular corners (1121, 1122) are cut off at both ends of the circular arc of the second sector-shaped metal sheet (112), the fifth and sixth rectangular corners (1131, 1132) are cut off at both ends of the circular arc of the third sector-shaped metal sheet (113), and the seventh and eighth rectangular corners (1141, 1142) are cut off at both ends of the circular arc of the fourth sector-shaped metal sheet (114); Etching first to fourth L-shaped gaps (1113, 1123, 1133, 1143) and first to fourth metal through holes (211, 212, 213, 214) on the first to fourth fan-shaped metal sheets (111, 112, 113, 114), respectively; A fifth metal through hole (25) is etched at a lower position of the fifth rectangular metal sheet (115).

5. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 4, characterized in that: The first to fourth metal through holes (211, 212, 213, 214) in the first group of metal sheets (11) are the first group of metal through holes (21), and the metal through holes on the fan-shaped metal sheets in the second to fourth groups of metal sheets (12, 13, 14) are the second to fourth groups of metal through holes (22, 23, 24); The metal through holes on the rectangular metal sheets in the first to fourth groups of metal sheets (11, 12, 13, 14) are the fifth to eighth metal through holes (25, 26, 27, 28) in sequence; The first to fourth groups of metal through holes (21, 22, 23, 24) connect the upper metal patch (1) and the middle metal patch (3), and the fifth to eighth metal through holes (25, 26, 27, 28) connect the upper metal patch (1) and the lower metal patch (5).

6. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 5, characterized in that: Twenty circular slits are etched on the middle layer metal patch (3); the first to fourth groups of metal through holes (21, 22, 23, 24) penetrate the middle layer metal patch (3) to form 16 circular slits; the fifth to eighth circular slits (31, 32, 33, 34) are etched at the positive projection position of the fifth to eighth metal through holes (25, 26, 27, 28); The radius of the fifth to eighth circular gaps (31, 32, 33, 34) is greater than the radius of the fifth to eighth metal through holes (25, 26, 27, 28), and the center positions of the circular gaps and the metal through holes at corresponding positions are the same.

7. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 6, characterized in that: The lower metal patch (5) is a 1-to-4 power divider composed of microstrip lines, and the 1-to-4 power divider as a whole is composed of 8 parts, namely a sixth metal sheet (51), a seventh metal sheet (52), an eighth metal sheet (53), a ninth metal sheet (54), a tenth metal sheet (55), an eleventh metal sheet (56), a twelfth metal sheet (57) and a thirteenth metal sheet (58); One end of the sixth metal sheet (51) is connected to the energy input port, and the other end thereof is branched into an eighth metal sheet (53) and a ninth metal sheet (54) through the seventh metal sheet (52); The eighth metal sheet (53) and the ninth metal sheet (54) have completely the same structure and are symmetrical from top to bottom. The eighth metal sheet (53) is composed of a lower rectangular metal sheet (531) and an upper rectangular metal sheet (532), and a first triangle (5311) is etched at the lower left corner of the lower rectangular metal sheet (531); the ninth metal sheet (54) is composed of an upper rectangular metal sheet (541) and a lower rectangular metal sheet (542), and a second triangle (5411) is etched at the upper left corner; The tenth metal sheet (55), the eleventh metal sheet (56), the twelfth metal sheet (57) and the thirteenth metal sheet (58) have the same structure, wherein the tenth metal sheet (55) and the eleventh metal sheet (56) are bilaterally symmetrical, and the twelfth metal sheet (57) and the thirteenth metal sheet (58) are bilaterally symmetrical; The tenth metal sheet (55) is composed of a first right rectangular metal sheet (551) and a first left rectangular metal sheet (552); a third triangle (5511) is etched at the upper right corner of the first right rectangular metal sheet (551); a fourth triangle (5521) is etched at the upper left corner of the first left rectangular metal sheet (552); and a fifth metal through hole (25) is etched at the lower left corner; the eleventh metal sheet (56) is composed of a second left rectangular metal sheet (561) and a second right rectangular metal sheet (562); a fifth triangle (5611) is etched at the upper left corner of the second left rectangular metal sheet (561); a sixth triangle (5621) is etched at the upper right corner of the second right rectangular metal sheet (562); and a sixth metal through hole (26) is etched at the lower right corner; The twelfth metal sheet (57) is composed of a third right rectangular metal sheet (571) and a third left rectangular metal sheet (572); a seventh triangle (5711) is etched at the lower right corner of the third right rectangular metal sheet (571); an eighth triangle (5721) is etched at the upper left corner of the third left rectangular metal sheet (572); and a seventh metal through hole (27) is etched at the lower left corner; the thirteenth metal sheet (58) is composed of a fourth left rectangular metal sheet (581) and a fourth right rectangular metal sheet (582); a ninth triangle (5811) is etched at the lower left corner of the fourth left rectangular metal sheet (581); a tenth triangle (5821) is etched at the upper right corner of the fourth right rectangular metal sheet (582); and an eighth metal through hole (28) is etched at the lower right corner.

8. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 7, characterized in that: Energy is input from the sixth metal sheet (51), transmitted to the tenth to thirteenth metal sheets (55, 56, 57, 58) through the seventh metal sheet (52), the eighth metal sheet (53) and the ninth metal sheet (54), and then transmitted through the fifth to eighth metal through holes (25, 26, 27, 28) through the fifth to eighth circular gaps (31, 32, 33, 34) to the first to fourth groups of metal sheets (11, 12, 13, 14) to radiate outwards. The middle layer metal patch (3) is a common floor for the antenna and the power divider, and the feed line is located on the lower layer metal patch (5).

9. The broadband high-gain magneto-electric dipole filtering antenna array according to claim 8, characterized in that: The lower metal patch (5) is not a vertically symmetrical structure. The eighth metal sheet (53) and the ninth metal sheet (54) are vertically symmetrical, the tenth metal sheet (55) and the eleventh metal sheet (56) are left-right symmetrical, the twelfth metal sheet (57) and the thirteenth metal sheet (58) are left-right symmetrical, the first right rectangular metal sheet (551) in the tenth metal sheet (55), the second left rectangular metal sheet (561) in the eleventh metal sheet (56), the third right rectangular metal sheet (571) in the twelfth metal sheet (57), and the fourth left rectangular metal sheet (581) in the thirteenth metal sheet (58) are vertically symmetrical, and the third left rectangular metal sheet (572) in the twelfth metal sheet (57) and the fourth right rectangular metal sheet (582) in the thirteenth metal sheet (58) are obtained by translating downward the first left rectangular metal sheet (552) in the tenth metal sheet (55) and the second right rectangular metal sheet (562) in the eleventh metal sheet (56).

10. The broadband high-gain magneto-electric dipole filtering antenna array according to any one of claims 1 to 9, characterized in that: The thickness of the upper dielectric substrate (2) is 1.57 mm, the thickness of the lower dielectric substrate (4) is 0.254 mm, and the overall height of the antenna is 1.824 mm.

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