Low-profile broadband high-isolation orthogonal dipole antenna and communication device

Abstract

The present invention discloses a low-profile broadband high-isolation orthogonal dipole antenna and a communication device. The antenna includes a radiator, metal posts, a first microstrip line feeding network, a second microstrip line feeding network, a slot microstrip line feeding network, a supporting dielectric plate, a dielectric plate and a ground plane. The first microstrip line feeding network, the second microstrip line feeding network and the slot microstrip line feeding network are arranged on the lower surface of the dielectric plate, the ground plane is arranged on the upper surface of the dielectric plate, and the supporting dielectric plate is located above the dielectric plate; the radiator is arranged on the upper surface of the supporting dielectric plate and includes four horizontally arranged metal patches that are opposite to each other in pairs. There are four groups of metal posts, and the four metal patches correspond to the four groups of metal posts one by one. Two of the opposite metal patches are respectively connected to the first microstrip line feeding network and the second microstrip line feeding network through the corresponding metal posts, and the other two opposite metal patches are connected to the ground plane through the corresponding metal posts. The present invention has the advantages of wide bandwidth, high isolation and low profile.

Description

Technical Field

[0001] The present invention relates to a dipole antenna, in particular to a low-profile broadband high-isolation orthogonal dipole antenna and a communication device, belonging to the field of wireless communication technology. Background Art

[0002] At present, wireless communication technology has profoundly affected and changed many aspects of modern human life. As an indispensable component in a radio system, the performance of an antenna plays a crucial role in the stability and efficiency of signal transmission. With the rapid development of technology, more and higher requirements are put forward for the performance of antennas, such as wide bandwidth, high isolation, miniaturization, low cross-polarization, stable radiation pattern and gain within the operating frequency band, low back radiation, etc. Due to its many advantages such as broadband, low back lobe radiation, and low cross-polarization, the dipole antenna has a good development prospect in wireless communication systems.

[0003] Traditional antenna designs usually require a large physical size to meet performance requirements. However, under modern technology and market trends, the compactness and miniaturization of devices have become the mainstream trend in design. The need for low-profile antennas has gradually emerged, that is, to achieve excellent performance within a limited space. For most dipole antennas, due to the characteristics of the antenna itself, the profile height of the antenna is about 0.25λ0 (λ0 is the wavelength corresponding to the center frequency point), which does not meet the requirements of low profile and miniaturization. Therefore, research on reducing the profile height of dipole antennas needs to be carried out to address this contradiction. The present invention finally achieves a profile height of 0.15λ0 by using copper posts to feed the radiation patch and combining the method of slotting the metal floor, effectively reducing the profile height of the antenna and making it applicable to more application scenarios.

[0004] A full-duplex antenna can achieve simultaneous transmission and reception functions without time division or frequency division, which has significant advantages in improving the efficiency and capacity of communication systems. However, to avoid a reduction in the operating efficiency of the full-duplex antenna due to the coupling between the two ports, it is necessary to increase the isolation between the two ports, which also becomes a difficulty to be overcome in the full-duplex application of dipole antennas. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a low-profile broadband high-isolation orthogonal dipole antenna. By changing the shape of the metal posts, adopting different feeding methods, and realizing orthogonal polarization, etc., the antenna isolation of the present invention is higher than 45 dB, and it has the advantages of wide bandwidth, high isolation, and low profile.

[0006] Another purpose of the present invention is to provide a communication device including the above antenna.

[0007] The object of the present invention can be achieved by adopting the following technical solutions:

[0008] A low-profile broadband high-isolation orthogonal dipole antenna, comprising a radiator, metal posts, a first microstrip line feeding network, a second microstrip line feeding network, a slot microstrip line feeding network, a supporting dielectric plate, a dielectric plate and a ground plane. The first microstrip line feeding network, the second microstrip line feeding network and the slot microstrip line feeding network are arranged on the lower surface of the dielectric plate. The ground plane is arranged on the upper surface of the dielectric plate. The supporting dielectric plate is located above the dielectric plate;

[0009] The radiator is arranged on the upper surface of the supporting dielectric plate and comprises four horizontally arranged metal patches in two pairs opposite to each other. There are four groups of metal posts. The four metal patches correspond to the four groups of metal posts one by one. Two opposite metal patches are respectively connected to the first microstrip line feeding network and the second microstrip line feeding network through the corresponding metal posts. The other two opposite metal patches are connected to the ground plane through the corresponding metal posts.

[0010] Further, the first microstrip line feeding network and the second microstrip line feeding network are symmetrical to each other. The first microstrip line feeding network includes a first feeding input port, a first section of microstrip line and a second section of microstrip line connected in sequence. The second microstrip line feeding network includes a second feeding input port, a third section of microstrip line and a fourth section of microstrip line connected in sequence.

[0011] Further, the length of the first section of microstrip line is greater than that of the second section of microstrip line, and the width of the first section of microstrip line is less than that of the second section of microstrip line. The length of the third section of microstrip line is greater than that of the fourth section of microstrip line, and the width of the third section of microstrip line is less than that of the fourth section of microstrip line.

[0012] Further, the slot microstrip line feeding network is a T-shaped power divider.

[0013] Further, the slot microstrip line feeding network includes a third feeding input port, a fifth section of microstrip line, a sixth section of microstrip line, a seventh section of microstrip line and an eighth section of microstrip line. There are two eighth sections of microstrip line. The third feeding input port is connected to one end of the fifth section of microstrip line. The other end of the fifth section of microstrip line is connected to one end of the sixth section of microstrip line. The other end of the sixth section of microstrip line is connected to the center of the seventh section of microstrip line. The two ends of the seventh section of microstrip line are respectively connected to the two eighth sections of microstrip line. The ground plane is provided with an I-shaped slot at the corresponding positions of the two eighth sections of microstrip line.

[0014] Further, the length of the fifth section of microstrip line is greater than that of the sixth section of microstrip line, and the width of the fifth section of microstrip line is greater than that of the sixth section of microstrip line.

[0015] Further, it further includes a metal wall, and the metal wall is disposed at the edge of the upper surface of the dielectric plate.

[0016] Further, the supporting dielectric plate is an octagonal structure, the dielectric plate is a square structure, and each metal patch is diamond-shaped.

[0017] Further, each group of metal columns includes three vertical metal rectangular columns. The cross-sections of the three metal rectangular columns together form a cross shape. The three metal rectangular columns are all solid columns, and there is an air gap layer between every two metal rectangular columns.

[0018] Another object of the present invention can be achieved by adopting the following technical solutions:

[0019] A communication device includes the above-mentioned low-profile broadband high-isolation orthogonal dipole antenna.

[0020] The present invention has the following beneficial effects compared with the prior art:

[0021] 1. The working frequency band of the present invention is 1.71 GHz - 2.73 GHz, and its working frequency band is relatively wide. The relative impedance bandwidth is 45.9%. By using orthogonal polarization, feeding with metal columns in the shape of a cross, and slotting the ground plane, etc., the current coupling between the two ports is extremely small, and the isolation |S12| is greater than 45.4 dB.

[0022] 2. The present invention changes the ground plane current path by combining the method of changing the shape of the metal columns and slotting the ground plane, effectively reducing the profile of the antenna. The present invention has a profile as small as 0.15λ0 and is an antenna with low-profile characteristics.

[0023] 3. The present invention has good radiation characteristics, and the radiation pattern is stable. When excited by a slot microstrip line feeding network, the front-to-back ratio is greater than 14 dB, and the cross polarization is less than -40 dB. When excited by two microstrip line feeding networks, the front-to-back ratio is greater than 8 dB, and the cross polarization is less than -33 dB.

[0024] 4. When the present invention is excited by a slot microstrip line feeding network, the antenna gain is higher than 7.76 dBi. When excited by two microstrip line feeding networks, the antenna gain is higher than 6.61 dBi. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0026] Figure 1 3D structure diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0027] Figure 2 3D structure diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention, omitting the radiator and the metal wall.

[0028] Figure 3 3D structure diagram of the support dielectric plate and the radiator of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0029] Figure 4 3D structure diagram of the first microstrip line feeding network and the second microstrip line feeding network of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0030] Figure 5 Planar structure diagram of the slot microstrip line feeding network of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0031] Figure 6 Front view structure diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0032] Figure 7 Top view structure diagram of the support dielectric plate of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0033] Figure 8 Bottom view structure diagram of the dielectric plate of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0034] Figure 9 S-parameter curve diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention.

[0035] Figure 10 Gain diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention when excited by the first microstrip line feeding network and the second microstrip line feeding network.

[0036] Figure 11 Gain diagram of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention when excited by the slot microstrip line feeding network.

[0037] Figure 12 Radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to an embodiment of the present invention when excited by the first microstrip line feeding network and the second microstrip line feeding network at a low frequency of 1.7 GHz.

[0038] Figure 13The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to the embodiment of the present invention is excited by the first microstrip line feeding network and the second microstrip line feeding network at the center frequency of 2.2 GHz.

[0039] Figure 14 The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to the embodiment of the present invention is excited by the first microstrip line feeding network and the second microstrip line feeding network at the high frequency of 2.7 GHz.

[0040] Figure 15 The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to the embodiment of the present invention is excited by the slot microstrip line feeding network at the low frequency of 1.7 GHz.

[0041] Figure 16 The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to the embodiment of the present invention is excited by the slot microstrip line feeding network at the center frequency of 2.2 GHz.

[0042] Figure 17 The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna according to the embodiment of the present invention is excited by the slot microstrip line feeding network at the high frequency of 2.7 GHz.

[0043] Wherein, 100 - radiator, 101 - first metal patch, 102 - second metal patch, 103 - third metal patch, 104 - fourth metal patch, 200 - metal column, 201 - first group of metal columns, 202 - second group of metal columns, 203 - third group of metal columns, 204 - fourth group of metal columns, 300 - first microstrip line feeding network, 301 - first feed input port, 302 - first section of microstrip line, 303 - second section of microstrip line, 400 - second microstrip line feeding network, 401 - second feed input port, 402 - third section of microstrip line, 403 - fourth section of microstrip line, 500 - slot microstrip line feeding network, 501 - third feed input port, 502 - fifth section of microstrip line, 503 - sixth section of microstrip line, 504 - seventh section of microstrip line, 505 - eighth section of microstrip line, 600 - support dielectric plate, 700 - dielectric plate, 800 - ground plane, 801 - first cross slot, 802 - first metal copper column slot, 803 - second cross slot, 804 - second metal copper column slot, 805 - I-shaped slot, 806 - first rectangular slot, 807 - second rectangular slot, 900 - metal wall. Detailed implementation manner

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] Embodiment:

[0046] As Figure 1 and Figure 2 shown, this embodiment provides a low-profile broadband high-isolation orthogonal dipole antenna, which can be applied to various communication devices. It includes a radiator 100, a metal post 200, a first microstrip line feeding network 300, a second microstrip line feeding network 400, a slot microstrip line feeding network 500, a supporting dielectric plate 600, a dielectric plate 700, and a ground plane 800. The first microstrip line feeding network 300, the second microstrip line feeding network 400, and the slot microstrip line feeding network 500 are disposed on the lower surface of the dielectric plate 700 by printing, and the ground plane 800 is disposed on the upper surface of the dielectric plate 600 by printing. The supporting dielectric plate 600 is located above the dielectric plate 700, where the supporting dielectric plate 600 is an octagonal structure and the dielectric plate 700 is a square structure.

[0047] Furthermore, the antenna of this embodiment further includes a metal wall 900, which is disposed at the edge of the upper surface of the dielectric plate 700, and the gain can be stabilized by the metal wall 900.

[0048] As Figures 1 to 3As shown, the radiator 100 is disposed on the upper surface of the supporting dielectric substrate 600 and includes four horizontally arranged metal patches that are opposite to each other in pairs. The four metal patches are the first metal patch 101, the second metal patch 102, the third metal patch 103, and the fourth metal patch 104 respectively. Among them, the first metal patch 101 and the third metal patch 103 are opposite to each other, and the second metal patch 102 and the fourth metal patch 104 are opposite to each other. There are four groups of metal posts 200, and the four metal patches correspond to the four groups of metal posts one by one. A cross-shaped groove slightly larger than the corresponding metal post is etched on each metal patch to prevent short circuit caused by contact between the two; the four groups of metal posts are the first group of metal posts 201, the second group of metal posts 202, the third group of metal posts 203, and the fourth group of metal posts 204 respectively. Each group of metal posts includes three vertical metal rectangular posts, and the cross-sections of the three metal rectangular posts together form a cross shape. The three metal rectangular posts are all solid posts, and there is an air gap layer between every two metal rectangular posts, which is convenient for producing physical objects and applying them to actual production. The first group of metal posts 201 connects the first metal patch 101 to the first microstrip line feeding network 300, and the third group of metal posts 203 connects the third metal patch 103 to the second microstrip line feeding network 400. The second group of metal posts 202 and the fourth group of metal posts 204 connect the second metal patch 102 and the fourth metal patch 104 to the ground plane 800 respectively, constituting the radiation part of the dipole antenna.

[0049] As Figures 1 to 4 shown, the first microstrip line feeding network 300 and the second microstrip line feeding network 400 are symmetric with each other, that is, the structures of the first microstrip line feeding network 300 and the second microstrip line feeding network 400 are the same. The first microstrip line feeding network 300 includes a first feeding input port 301, a first section of microstrip line 302, and a second section of microstrip line 303 connected in sequence. Among them, the length of the first section of microstrip line 302 is greater than the length of the second section of microstrip line 303, and the width of the first section of microstrip line 302 is less than the width of the second section of microstrip line 303. The second microstrip line feeding network 400 includes a second feeding input port 401, a third section of microstrip line 402, and a fourth section of microstrip line 403 connected in sequence. Among them, the length of the third section of microstrip line 402 is greater than the length of the fourth section of microstrip line 403, and the width of the third section of microstrip line 402 is less than the width of the fourth section of microstrip line 403; the two sections of microstrip lines of the first microstrip line feeding network 300 and the second microstrip line feeding network 400 constitute the microstrip line part, and together with the first group of metal posts 201 and the third group of metal posts 203, they form the microstrip line feeding part. The first microstrip line feeding network 300 and the second microstrip line feeding network 400 are respectively externally connected to excitation signals with opposite phases through the first feeding input port 301 and the second feeding input port 401, and are transmitted to the microstrip line to excite the first metal patch 101 and the third metal patch 103; in addition, Figure 4Also shown in the figure are a first cross-shaped groove 801 and a second cross-shaped groove 803 located on the floor 800, which are relatively large grooves provided to prevent short circuits between the first group of metal columns 201 and the third group of metal columns 203.

[0050] As Figures 1 to 3 , Figure 5 shown, the slot microstrip line feeding network 500 is a T-shaped power divider. The slot microstrip line feeding network 500 includes a third feeding input port 501, a fifth microstrip line 502, a sixth microstrip line 503, a seventh microstrip line 504, and an eighth microstrip line 505. There are two eighth microstrip lines 505. The third feeding input port 501 is connected to one end of the fifth microstrip line 502. The other end of the fifth microstrip line 502 is connected to one end of the sixth microstrip line 503. The length of the fifth microstrip line 502 is greater than that of the sixth microstrip line 503, and the width of the fifth microstrip line 502 is greater than that of the sixth microstrip line 503. The other end of the sixth microstrip line 503 is connected to the center of the seventh microstrip line 504. The two ends of the seventh microstrip line 504 are respectively connected to the two eighth microstrip lines 505. The floor 800 is provided with an I-shaped groove 805 at the corresponding positions of the two eighth microstrip lines 505. The T-shaped power divider and the I-shaped groove 805 together form the slot microstrip line feeding part. The slot microstrip line feeding network 500 inputs an excitation signal through the input port 501 and excites the antenna through slot coupling of the I-shaped groove 805. In addition, Figure 5 also shown in the figure are a first metal copper column groove 802 and a second metal copper column groove 804 located on the floor 800, which are consistent in size with the second group of metal columns 202 and the fourth group of metal columns 204, and also shown are a first rectangular groove 806 and a second rectangular groove 807 located on the floor 800, which are used to improve the matching and isolation performance of the antenna.

[0051] As Figure 6 shown, from top to bottom, the thickness H1 of the supporting dielectric plate 600 is 0.762 mm, the height H2 from the lower surface of the supporting dielectric plate 600 to the upper surface of the metal wall 900 is 3.5 mm, the height H3 of the metal wall 900 is 15.0 mm, and the thickness H4 of the dielectric plate 700 is 1.524 mm. The specifications of both the supporting dielectric plate 600 and the dielectric plate 700 are Arlon25FR dielectric plates, with a dielectric constant of 3.58 and a loss tangent of 0.0035. The dielectric plate is a square structure with a side length L13 of 160 mm.

[0052] As Figure 7As shown in the figure, from top to bottom, the side lengths of the supporting dielectric plate 600 are S1 = 35.0 mm and S2 = 56.6 mm. The first metal patch 101 and the third metal patch 103 are symmetric structures left and right, and the second metal patch 102 and the fourth 104 are symmetric structures up and down; the lengths of the first metal patch 101 in the horizontal direction are S3 = 8.7 mm, S4 = 45.7 mm, and S5 = 0.8 mm in sequence; the lengths of the fourth metal patch 104 in the vertical direction are S6 = 1.5 mm, S7 = 35.6 mm, and S8 = 10.3 mm in sequence; the first group of metal posts 201 and the third group of metal posts 203 are symmetric structures left and right, and the second group of metal posts 202 and the fourth group of metal posts 204 are symmetric structures up and down; the dimensions of the first group of metal posts 201 and the third group of metal posts 203 are: L3 = 3.7 mm, L4 = 2.0 mm, W3 = 2.0 mm, and W4 = 3.7 mm in sequence; the dimensions of the second group of metal posts 202 and the fourth group of metal posts 204 are: L1 = 12.0 mm, L2 = 5.4 mm, W1 = 2.0 mm, and W2 = 2.0 mm in sequence.

[0053] As Figure 8 shown, the first microstrip line feeding network 300 and the second microstrip line feeding network 400 are symmetric structures. The lengths L5 of the first section of microstrip line 302 and the third section of microstrip line 402 are 37.4 mm, and the widths W5 are 3.4 mm. The lengths L6 of the second section of microstrip line 303 and the fourth section of microstrip line 403 are 25.5 mm, and the widths W6 are 7.1 mm; the length L7 of the rectangular slot on the first microstrip line feeding network 300 is 15.8 mm, and W7 is 1.3 mm; the length and width dimensions of the I-shaped slot 805 on the ground plane 800 are L8 = 17.0 mm, L9 = 16.1 mm, W8 = 3.2 mm, and W9 = 1.2 mm; the microstrip line length dimensions of the slot microstrip line feeding network 500 from top to bottom are: the length L10 of the seventh section of microstrip line 504 is 17.9 mm, the length L11 of the sixth section of microstrip line 503 is 22.4 mm, the width W10 is 1.5 mm, the length L12 of the fifth section of microstrip line 502 is 34.1 mm, and the width W11 is 3.4 mm.

[0054] Figure 9 The S-parameter curve graph of the low-profile broadband high-isolation orthogonal dipole antenna of this embodiment is shown. It can be seen that the operating frequency band of the antenna is 1.71 GHz - 2.73 GHz, the relative bandwidth is 45.9%, and the isolation is greater than 45.4 dB.

[0055] Figure 10 The gain graph of the low-profile broadband high-isolation orthogonal dipole antenna of this embodiment when excited by the first microstrip line feeding network 300 and the second microstrip line feeding network 400 (the port feedings 300 and 400 are shown in the figure) is shown. It can be seen that the gain of the antenna is higher than 6.61 dBi;Figure 11 The gain diagram of the low-profile broadband high-isolation orthogonal dipole antenna of this embodiment when excited by the slot microstrip line feeding network 500 (port feeding 500 is shown in the figure). It can be seen that the gain of the antenna is higher than 7.76 dBi.

[0056] Figures 12 to 17 The radiation pattern of the low-profile broadband high-isolation orthogonal dipole antenna of this embodiment, which respectively shows the radiation patterns in the xoz plane (phi = 0 deg) at low frequency 1.7 GHz, center frequency 2.2 GHz, and high frequency 2.7 GHz under different excitations. This antenna has good radiation characteristics and a stable radiation pattern. Among them, Figures 12 to 14 The radiation patterns of the low-profile broadband high-isolation orthogonal dipole antenna of the embodiments of the present invention when excited at low frequency 1.7 GHz, center frequency 2.2 GHz, and high frequency 2.7 GHz by using the first microstrip line feeding network and the second microstrip line feeding network (port feedings 300 and 400 are shown in the figure). At low frequency 1.7 GHz, the front-to-back ratio is greater than 22 dB, and the cross-polarization is less than -52 dB; at the center frequency 2.2 GHz, the front-to-back ratio is greater than 16 dB, and the cross-polarization is less than -43 dB; at high frequency 2.7 GHz, the front-to-back ratio is greater than 8 dB, and the cross-polarization is less than -33 dB; Figures 15 to 17 The radiation patterns of the low-profile broadband high-isolation orthogonal dipole antenna of the embodiments of the present invention when excited at low frequency 1.7 GHz, center frequency 2.2 GHz, and high frequency 2.7 GHz by using the slot microstrip line feeding network (port feeding 500 is shown in the figure). At low frequency 1.7 GHz, the front-to-back ratio is greater than 14 dB, and the cross-polarization is less than -54 dB; at the center frequency 2.2 GHz, the front-to-back ratio is greater than 18 dB, and the cross-polarization is less than -52 dB; at high frequency 2.7 GHz, the front-to-back ratio is greater than 15 dB, and the cross-polarization is less than -40 dB.

[0057] In summary, the low-profile broadband high-isolation orthogonal dipole antenna of this embodiment has the following advantages:

[0058] 1) The slot microstrip line feeding network composed of a T-type power divider and the microstrip line feeding network are orthogonal to each other, realizing vertical and horizontal dual-polarization radiation. The T power divider and the I-shaped slot are introduced to improve the impedance bandwidth and isolation of this example. In the frequency band of 1.71 GHz - 2.73 GHz, |S11|, |S22| < -10 dB. The bandwidth reaches 45.9%.

[0059] 2) By using orthogonal polarization, feeding with a metal post in the shape of a cross, and slitting the ground plane, etc., the current coupling between the two ports is extremely small, making the isolation |S12| greater than 45.4 dB.

[0060] 3) By combining the methods of changing the shape of the metal posts and grooving the floor, the floor current path is changed, effectively reducing the profile of the antenna to as small as 0.15λ0.

[0061] As described above, it is only a preferred embodiment of the present invention patent, but the implementation mode of the present invention is not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A low-profile broadband high-isolation orthogonal dipole antenna, characterized in that, It includes a radiator, metal posts, a first microstrip line feeding network, a second microstrip line feeding network, a slot microstrip line feeding network, a supporting dielectric plate, a dielectric plate and a ground plane. The first microstrip line feeding network, the second microstrip line feeding network and the slot microstrip line feeding network are arranged on the lower surface of the dielectric plate. The slot microstrip line feeding network is orthogonal to the first microstrip line feeding network and the second microstrip line feeding network. The ground plane is arranged on the upper surface of the dielectric plate. The supporting dielectric plate is located above the dielectric plate; The radiator is arranged on the upper surface of the supporting dielectric plate and includes four horizontally arranged metal patches that are opposite to each other in pairs. There are four groups of metal posts. The four metal patches correspond to the four groups of metal posts one by one. Two opposite metal patches are respectively connected to the first microstrip line feeding network and the second microstrip line feeding network through the corresponding metal posts. The other two opposite metal patches are connected to the ground plane through the corresponding metal posts; Each group of metal posts includes three vertical metal rectangular posts. The cross-sections of the three metal rectangular posts together form a cross shape. The three metal rectangular posts are all solid posts. There is an air gap layer between every two metal rectangular posts. The four groups of metal posts are the first group of metal posts, the second group of metal posts, the third group of metal posts and the fourth group of metal posts. The first group of metal posts is symmetric with the third group of metal posts. The second group of metal posts is symmetric with the fourth group of metal posts.

2. The low-profile broadband high-isolation orthogonal dipole antenna according to claim 1, characterized in that The first microstrip line feeding network and the second microstrip line feeding network are symmetric with each other. The first microstrip line feeding network includes a first feeding input port, a first section of microstrip line and a second section of microstrip line that are connected in sequence; The second microstrip line feeding network includes a second feeding input port, a third section of microstrip line and a fourth section of microstrip line that are connected in sequence.

3. The low-profile broadband high-isolation orthogonal dipole antenna according to claim 2, wherein The length of the first section of microstrip line is greater than the length of the second section of microstrip line, and the width of the first section of microstrip line is less than the width of the second section of microstrip line; The length of the third section of microstrip line is greater than the length of the fourth section of microstrip line, and the width of the third section of microstrip line is less than the width of the fourth section of microstrip line.

4. The low-profile broadband high-isolation orthogonal dipole antenna according to claim 1, wherein The slot microstrip line feeding network is a T-shaped power divider.

5. The low-profile broadband high-isolation orthogonal dipole antenna according to claim 4, wherein The slot microstrip line feeding network includes a third feeding input port, a fifth section of microstrip line, a sixth section of microstrip line, a seventh section of microstrip line and an eighth section of microstrip line. There are two eighth sections of microstrip line. The third feeding input port is connected to one end of the fifth section of microstrip line. The other end of the fifth section of microstrip line is connected to one end of the sixth section of microstrip line. The other end of the sixth section of microstrip line is connected to the center of the seventh section of microstrip line. The two ends of the seventh section of microstrip line are respectively connected to the two eighth sections of microstrip line. The ground plane has an I-shaped groove at the corresponding positions of the two eighth sections of microstrip line.

6. The low-profile broadband high-isolation orthogonal dipole antenna according to claim 5, wherein The length of the fifth section of microstrip line is greater than the length of the sixth section of microstrip line, and the width of the fifth section of microstrip line is greater than the width of the sixth section of microstrip line.

7. The low-profile broadband high-isolation orthogonal dipole antenna according to any one of claims 1-6, characterized in that, It also includes a metal wall, and the metal wall is arranged at the edge of the upper surface of the dielectric plate.

8. The low-profile broadband high-isolation orthogonal dipole antenna according to any one of claims 1-6, characterized in that, The supporting dielectric plate is an octagonal structure, the dielectric plate is a square structure, and each metal patch is in a diamond shape.

9. A communication device, characterized in that, It includes the low-profile broadband high-isolation orthogonal dipole antenna according to any one of claims 1-8.

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