Single-layer broadband microstrip patch antenna array and communication device

Abstract

The present application relates to a single-layer broadband microstrip patch antenna array and a communication device. The single-layer broadband microstrip patch antenna array includes: a first array element group, a second array element group and a rectangular gap; the first array element group includes at least one array element, and the second array element group includes at least one array element; the rectangular gap is located between the first array element group and the second array element group, and the first array element group and the second array element group are centrally symmetric based on the rectangular gap. By setting a rectangular gap between two array element groups, the isolation between adjacent array element groups is improved, thereby simply and effectively reducing the influence of each array element on other array elements, and improving the consistency of the phase response of each array element to the incident electromagnetic wave, so that the positioning signal obtained based on the antenna array is more accurate.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to a single-layer broadband microstrip patch antenna array and a communication device. Background Art

[0002] With the development of wireless positioning technology, antenna technology is being used more and more widely. The antenna is located at the forefront of the wireless positioning system and is the carrier for receiving information. The antenna can convert spatial electromagnetic wave signals into electrical signals. The amplitude, phase and other information of the electrical signals are the measurement values ​​required by the positioning system.

[0003] As the number of antenna array elements increases and the environments in which the antenna array elements are located differ, elements at different positions in the array are affected by other elements and the environment. Each element has a different phase response to the incident electromagnetic wave, resulting in a relatively low positioning accuracy of the positioning system. Summary of the invention

[0004] Based on this, it is necessary to provide a single-layer broadband microstrip patch antenna array and communication equipment that can improve positioning accuracy in response to the above technical problems.

[0005] In a first aspect, the present application provides a single-layer broadband microstrip patch antenna array. The single-layer broadband microstrip patch antenna array comprises: a first array element group, a second array element group and a rectangular slot; the first array element group comprises at least one array element, and the second array element group comprises at least one array element;

[0006] The rectangular gap is located between the first array element group and the second array element group, and the first array element group and the second array element group are centrally symmetrical based on the rectangular gap.

[0007] In one of the embodiments, at least one array element is a single-layer dielectric substrate microstrip patch antenna, which includes a single-layer dielectric substrate, a rectangular patch antenna unit, a feed transmission line, and a symmetric transmission line; the rectangular patch antenna unit, the feed transmission line, and the symmetric transmission line are all arranged on a first copper-clad layer of the single-layer dielectric substrate, and the rectangular slot is arranged on a second copper-clad layer of the single-layer dielectric substrate;

[0008] The feeding transmission line and the symmetrical transmission line are located at two ends of the rectangular patch antenna unit, and the feeding transmission line and the symmetrical transmission line are centrally symmetrical with respect to the rectangular patch antenna unit.

[0009] In one embodiment, the feeding transmission line is a T-shaped feeding transmission line, and the symmetrical transmission line is a T-shaped symmetrical transmission line, and the T-shaped feeding transmission line and the T-shaped symmetrical transmission line have the same shape.

[0010] In one embodiment, the first array element group and the second array element group each include at least two array elements, and a folding gap is provided between each two adjacent array elements in the first array element group and the second array element group, and the distance between the folding gap and the two adjacent array elements is equal.

[0011] In one embodiment, the folding slits include short transverse slits and long longitudinal slits, and the short transverse slits and the long longitudinal slits are cross-circularly connected.

[0012] In one of the embodiments, the length of the folded slot is determined by half the wavelength of the operating frequency of at least one array element.

[0013] In one embodiment, the first array element group and the second array element group each include at least one working array element and one dummy array element, the dummy array elements are located at both ends of the single-layer broadband microstrip patch antenna array, and the working array elements are located between the dummy array elements; the working array elements and the dummy array elements have the same size.

[0014] In one embodiment, the virtual array elements are matched by using chip resistors, or by using an SMA connector plus a matching load.

[0015] In one embodiment, the interval between adjacent array elements is determined by half the wavelength of the operating frequency of at least one array element.

[0016] In a second aspect, the present application further provides a communication device, the communication device comprising a single-layer broadband microstrip patch antenna array as in the first aspect.

[0017] The above-mentioned single-layer broadband microstrip patch antenna array and communication device, the single-layer broadband microstrip patch antenna array includes: a first array element group, a second array element group and a rectangular gap; the first array element group includes at least one array element, and the second array element group includes at least one array element; the rectangular gap is located between the first array element group and the second array element group, and the first array element group and the second array element group are centrally symmetrical based on the rectangular gap. When the RF ports connected to the array element feed port are located on both sides of the antenna array, since the first array element group and the second array element group are centrally symmetrical based on the rectangular gap, it is convenient to connect the RF ports at both ends. By setting a rectangular gap between the two array element groups, the isolation between adjacent array element groups is improved, thereby simply and effectively reducing the influence of each array element on other array elements, and improving the consistency of the phase response of each array element to the incident electromagnetic wave, so that the positioning signal obtained based on the antenna array is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a single-layer broadband microstrip patch antenna array in one embodiment;

[0019] Figure 2 A schematic diagram of the structure of a single-layer broadband microstrip patch antenna array in another embodiment;

[0020] Figure 3 A schematic diagram of the structure of a single-layer broadband microstrip patch antenna array in another embodiment;

[0021] Figure 4 A schematic diagram of the structure of a single-layer broadband microstrip patch antenna array in another embodiment;

[0022] Figure 5 A schematic diagram of the structure of a single-layer broadband microstrip patch antenna array in another embodiment;

[0023] Figure 6 is a simulation result diagram of the return loss of a working array element of a single-layer broadband microstrip patch antenna array in one embodiment;

[0024] Figure 7 A schematic diagram of the phase difference of working array elements of different array element groups of a single-layer broadband microstrip patch antenna array in one embodiment;

[0025] Figure 8 A schematic diagram of phase differences of working array elements of the same array element group of a single-layer broadband microstrip patch antenna array in one embodiment;

[0026] Fig. 9 A schematic diagram of the isolation between array elements when a single-layer broadband microstrip patch antenna array is provided with rectangular gaps and folded gaps in one embodiment;

[0027] Fig.10 A schematic diagram of isolation between array elements when a single-layer broadband microstrip patch antenna array is provided with no rectangular gaps and folded gaps in one embodiment;

[0028] Description of reference numerals:

[0029] 01: Single-layer broadband microstrip patch antenna array; 10: First array element;

[0030] 20: second array element; 30: rectangular gap;

[0031] 101: array element; 1011: rectangular patch antenna unit;

[0032] 1012: feeding transmission line; 1013: symmetrical transmission line;

[0033] 102: folding gap; 103: working array element;

[0034] 104: Virtual Array Element. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] With the development of industries such as mobile communications, autonomous driving, and smart factories, the demand for location information is becoming increasingly popular, and the requirements for location accuracy are becoming higher and higher. Wireless positioning technology is an important way to obtain location. There are many types and methods. Different positioning methods are often used for different scenarios. The current mainstream positioning technologies include Radio Frequency Identification (RFID), wireless network communication technology, Ultra WideBand (UWB), Bluetooth and other positioning methods.

[0037] In wireless positioning systems, distance, angle, speed, etc. are all obtained through measurement calculations, so relatively accurate measurement values ​​can ensure the positioning accuracy of the positioning system. The antenna is located at the forefront of the wireless positioning system and is the carrier of information reception. The antenna can convert spatial electromagnetic wave signals into electrical signals. The amplitude, phase and other information of the electrical signals are the measurement values ​​required by the positioning system. The positioning method based on angle parameter estimation has strict requirements on the phase of the antenna array, and it is necessary to obtain the phase values ​​of each element of the antenna array at different incident angles as accurately as possible. However, with the increase in the number of antenna array elements and the differences in the environment in which the antenna array elements are located, the elements at different positions in the array are affected by other elements and the environment, and each element has different amplitude and phase responses to the incident electromagnetic wave. Therefore, removing the influence of the antenna's own phase difference on the phase of the received electrical signal as much as possible will inevitably improve the positioning accuracy of the wireless positioning system.

[0038] In one embodiment, Figure 1 As shown, a single-layer broadband microstrip patch antenna array 01 is provided, and the single-layer broadband microstrip patch antenna array 01 includes: a first array element group 10, a second array element group 20 and a rectangular slot 30; the first array element group 10 includes at least one array element 101, and the second array element group 20 includes at least one array element 101; the rectangular slot 30 is located between the first array element group 10 and the second array element group 20, and the first array element group 10 and the second array element group 20 are centrally symmetric based on the rectangular slot 30.

[0039] Specifically, the array element 101 is an independent unit constituting the antenna array, and the rectangular slot 30 is a slot dug out on the floor between the first array element group 10 and the second array element group 20, and the rectangular slot 30 is equidistant from the first array element group 10 and the second array element group 20. The first array element group 10 and the second array element group 20 have the same structure and size, and the first array element group 10 and the second array element group 20 are centrally symmetrical based on the rectangular slot 30. The rectangular slot 30 is provided to improve the isolation between the first array element group 10 and the second array element group 20, wherein the isolation is an interference suppression measure taken to minimize the influence of various interferences on the receiver.

[0040] Optionally, when the number of array elements in the first array element group 10 is greater than 2, and / or the number of array elements 101 in the second array element group 20 is greater than 2, an additional metal strip may be added between two adjacent array elements 101 to improve the isolation between the two array elements 101 .

[0041] In this embodiment, the first array element group 10 includes at least one array element 101, and the second array element group 20 includes at least one array element 101. The number of array elements 101 in the first array element group 10 and the second array element group 20 can be determined according to actual needs, and optionally, Figure 1 As shown, the first array element group 10 and the second array element group 20 each include two array elements 101 , but the present invention is not limited thereto.

[0042] The above-mentioned single-layer broadband microstrip patch antenna array includes: a first array element group, a second array element group and a rectangular gap; the first array element group includes at least one array element, and the second array element group includes at least one array element; the rectangular gap is located between the first array element group and the second array element group, and the first array element group and the second array element group are centrally symmetrical based on the rectangular gap. When the radio frequency ports connected to the array element feed port are located on both sides of the antenna array, since the first array element group and the second array element group are centrally symmetrical based on the rectangular gap, it is convenient to connect the radio frequency ports at both ends. By setting a rectangular gap between two array element groups, the isolation between adjacent array element groups is improved, thereby simply and effectively reducing the influence of each array element on other array elements, and improving the consistency of the phase response of each array element to the incident electromagnetic wave, so that the positioning signal obtained based on the antenna array is more accurate.

[0043] In the above scenario where the first array element group 10 includes at least one array element 101 and the second array element group 20 includes at least one array element 101, in one embodiment, Figure 2As shown, at least one array element 101 is a single-layer dielectric substrate microstrip patch antenna, which includes a single-layer dielectric substrate, a rectangular patch antenna unit 1011, a feeding transmission line 1012 and a symmetric transmission line 1013; the rectangular patch antenna unit 1011, the feeding transmission line 1012 and the symmetric transmission line 1013 are all arranged on the first copper clad layer of the single-layer dielectric substrate, and the rectangular slot 30 is arranged on the second copper clad layer of the single-layer dielectric substrate; the feeding transmission line 1012 and the symmetric transmission line 1013 are located at two ends of the rectangular patch antenna unit 1011, and the feeding transmission line 1012 and the symmetric transmission line 1013 are centrally symmetric relative to the rectangular patch antenna unit 1011.

[0044] Specifically, in this embodiment, the array element 101 is a single-layer dielectric substrate microstrip patch antenna, which includes a single-layer dielectric substrate, a rectangular patch antenna unit 1011, a feeding transmission line 1012, and a symmetrical transmission line 1013. The single-layer dielectric substrate includes a first copper-clad layer, a second copper-clad layer, and a dielectric layer. The first copper-clad layer is etched into the shape of a rectangular patch antenna unit 1011, a feeding transmission line 1012, and a symmetrical transmission line 1013. The rectangular patch antenna unit 1011, the feeding transmission line 1012, and the symmetrical transmission line 1013 are arranged at corresponding positions. The feeding mode of the rectangular patch antenna unit 1011 is side coupling feeding. The feeding transmission line 1012 is used to excite the rectangular patch antenna on the single-layer dielectric substrate. Optionally, the feeding transmission line 1012 can be a rectangular feeding transmission line or a trapezoidal feeding transmission line. The second copper-clad layer is a metal ground, and a rectangular gap 30 is etched on the second copper-clad layer.

[0045] Preferably, the single-layer dielectric substrate adopts a dielectric substrate with a thickness of 1.5mm to 3.5mm, and the single-layer dielectric substrate adopts a dielectric substrate with a dielectric constant of 2 to 3.5. Since the dielectric substrate with this thickness and dielectric constant can be widely used, it is convenient to match with other equipment and can also reduce costs. Optionally, in this embodiment, the plate model of the dielectric layer of the single-layer dielectric substrate can be F4BM250, the dielectric constant of the dielectric substrate can be 2.5, the loss tangent of the dielectric substrate can be 0.0016, the thickness of the dielectric substrate can be 2mm, the length of the dielectric substrate of each array element 101 can be 35mm, the width can be 27mm, and the width of the dielectric substrate of each array element 101 can be 0.9 to 1.1 times the half wavelength of the center frequency.

[0046] In this embodiment, a symmetrical transmission line 1013 is provided on the first copper clad layer, and the symmetrical transmission line 1013 is consistent in shape with the feeding transmission line 1012, and the feeding transmission line 1012 and the symmetrical transmission line 1013 are centrally symmetrical relative to the rectangular patch antenna unit 1011, so that the surrounding environment of all array elements 101 is similar, thereby improving the phase consistency of each array element 101. Optionally, in this embodiment, the feeding transmission line 1012 may be a T-shaped feeding transmission line 1012, and the symmetrical transmission line 1013 may be a T-shaped symmetrical transmission line 1013. Optionally, the head of the T-shaped feeding transmission line 1012 has a length of 18.1 mm and a width of 2 mm, the tail of the T-shaped feeding transmission line 1012 has a length of 8 mm and a width of 2.5 mm, and the interval between the T-shaped feeding transmission line 1012 and the radiation edge of the adjacent rectangular patch antenna unit 1011 is 1.75 mm.

[0047] Optionally, the feeding transmission line 1012 is fed by welding a stripped cable at one end or by a connector such as SMA, SMB, or SMP, etc. The connector is a device that connects two active devices and is used to transmit current or signals.

[0048] Further, the length of the radiating side and the length of the non-radiating side of the rectangular patch antenna unit 1011 are adjusted according to the actual application scenario. Optionally, the length of the radiating side of the rectangular patch antenna unit 1011 is 18.5 mm, and the length of the non-radiating side is 17.5 mm. Optionally, the length of the rectangular slot 30 is 32 mm, and the width of the rectangular slot 30 is 4 mm.

[0049] In this embodiment, the array element includes: a single-layer dielectric substrate, a rectangular patch antenna unit, a feeding transmission line and a symmetrical transmission line. The rectangular patch antenna unit, the feeding transmission line and the symmetrical transmission line are all arranged on the first copper-clad layer of the single-layer dielectric substrate, and the rectangular slot is arranged on the second copper-clad layer of the single-layer dielectric substrate. The rectangular patch antenna unit is fed by side coupling, so that the electrical characteristics of the antenna remain relatively stable within a wider frequency band. A symmetrical transmission line that is consistent in shape with the feeding transmission line and symmetrical to the center of the feeding transmission line is arranged, so that the surrounding environments of all array elements are similar, and the phase consistency of each array element is improved, so that the positioning signal obtained based on the antenna array is more accurate.

[0050] In the scenario where the above-mentioned single-layer broadband microstrip patch antenna array 01 includes: a first array element group 10, a second array element group 20 and a rectangular slot 30, in one embodiment, as Figure 3 As shown, the first array element group 10 and the second array element group 20 each include at least two array elements 101 , and a folding gap 102 is provided between each two adjacent array elements 101 in the first array element group 10 and the second array element group 20 , and the distance between the folding gap 102 and the two adjacent array elements 101 is equal.

[0051] In this embodiment, a folded gap 102 is provided between each two adjacent array elements 101 in the first array element group 10 and the second array element group 20. The folded gap 102 is obtained by etching the second copper clad layer of the single-layer dielectric substrate. The folded gap 102 can improve the isolation between adjacent array elements 101.

[0052] Optionally, the folded slot 102 may be a slot in the shape of a curved slot, a "Z"-shaped slot, or a "3"-shaped slot. Optionally, in this embodiment, the folded slot 102 includes a short transverse slot and a long longitudinal slot, and the short transverse slot and the long longitudinal slot are cross-circularly connected. The folded slot 102 includes at least one short transverse slot and at least one long longitudinal slot, and the total length of the at least one short transverse slot and the at least one long longitudinal slot is equal to or less than half the wavelength of the center operating frequency.

[0053] Optionally, the length of the folded slit 102 is determined by the half wavelength of the working frequency of at least one array element 101. The half wavelength of the working frequency of the array element 101 may be 28 mm to 32 mm. In the present embodiment, the half wavelength of the working frequency of the array element 101 may be 30 mm. In the present embodiment, the length of the short transverse slit may be 2 mm, the length of the long longitudinal slit may be 3 mm, and the width of the short transverse slit and the long longitudinal slit are both 1 mm. Optionally, in the present embodiment, each folded slit 102 includes 6 short transverse slits and 5 long longitudinal slits. Due to the slit corner effect, the length of each folded slit 102, that is, the total length of the short transverse slit plus the long longitudinal slit is 30 mm, which is approximately half the wavelength of the working frequency of the array element 101.

[0054] Optionally, the interval between adjacent array elements 101 is determined by half the wavelength of the operating frequency of at least one array element 101. Preferably, the interval between adjacent array elements 101 is 0.8 to 1.1 times the half wavelength of the operating frequency of the array element 101. In this embodiment, the interval between array elements 101 may be 0.9 times the half wavelength of the operating frequency of the array element 101, that is, the interval between array elements 101 may be 27 mm, the width of array elements 101 may be 35 mm, the overall length of the antenna array may be 160 mm, the overall width of the antenna array may be 35 mm, and the height of the antenna array may be 2 mm.

[0055] In this embodiment, a folding gap is provided between each two adjacent array elements in the first array element group and the second array element group. The folding gap can improve the isolation between the two adjacent array elements, and the distance between the folding gap and the two adjacent array elements is equal, and the influence on the two array elements is the same. The folding gap is etched on the dielectric substrate, which has the advantage of simple welding and assembly, thereby simply and effectively reducing the phase difference caused by the influence of other array elements and the environment on the array elements at different positions in the array, and improving the positioning accuracy of the wireless positioning system.

[0056] In the scenario where the above-mentioned single-layer broadband microstrip patch antenna array 01 includes: a first array element group 10, a second array element group 20 and a rectangular slot 30, in one embodiment, as Figure 4 As shown, the first array element group 10 and the second array element group 20 each include at least one working array element 103 and one virtual array element 104, the virtual array element 104 is located at both ends of the single-layer broadband microstrip patch antenna array 01, and the working array element 103 is located between the virtual array elements 104; the working array element 103 and the virtual array element 104 have the same size.

[0057] In this embodiment, the first array element group 10 and the second array element group 20 each include at least one working array element 103 and one virtual array element 104. The size of the virtual array element 104 is consistent with the size of the working array element 103. The number of working array elements 103 can be increased or decreased according to actual application requirements. Optionally, in this embodiment, the first array element group 10 and the second array element group 20 each include two working array elements 103 and one virtual array element 104, but the embodiment of the present application is not limited thereto.

[0058] In this embodiment, the first array element group and the second array element group each include at least one working array element and one virtual array element. The working array element can convert a spatial electromagnetic wave signal into an electrical signal. The virtual array element is located at both ends of the single-layer broadband microstrip patch antenna array. The virtual array element enables the working array elements located at the edge to have a radiation environment similar to that of the working array elements at the center, thereby reducing interference and improving the phase consistency between the working array elements in a large angle range of the horizontal section, thereby making the positioning signal obtained based on the antenna array more accurate.

[0059] In the scenario where both the first array element group 10 and the second array element group 20 include at least one working array element 103 and one virtual array element 104, in one embodiment, Figure 5 As shown, the virtual array element 104 is matched by using a chip resistor 1041, or by using an SMA connector plus a matching load.

[0060] Specifically, the virtual array element 104 is arranged so that the working array element 103 adjacent to the virtual array element 104 has a radiation environment similar to the working array element 103 at the center position, and the feeding transmission line 1012 of the virtual array element 104 is matched by welding the chip resistor 1041, or by using an SMA connector plus a matching load.

[0061] Preferably, the feeding transmission line 1012 of the virtual array element 104 is matched by welding with a 50-ohm chip resistor 1041. This has the advantages of simple structure, easy assembly and low cost.

[0062] In this embodiment, the single-layer broadband microstrip patch antenna array adopts an integrated PCB processing method, which is convenient for assembly. There are two optional matching methods for the virtual array elements. The virtual array elements are matched by patch resistors, or by using SMA connectors plus matching loads, so as to achieve the effect of making the working array elements adjacent to the virtual array elements have a radiation environment similar to the working array elements at the center position, reduce interference, and improve the phase consistency between the working array elements in a large angle range of the horizontal section, so that the positioning signal obtained based on the antenna array is more accurate.

[0063] The following describes an embodiment of the present disclosure in conjunction with a specific single-layer broadband microstrip patch antenna array. Figure 5As shown, the single-layer broadband microstrip patch antenna array 01 includes: a first array element group 10, a second array element group 20 and a rectangular slot 30; the first array element group 10 includes at least one working array element 103 and one virtual array element 104, and the second array element group 20 includes at least one working array element 103 and one virtual array element 104; the rectangular slot 30 is located between the first array element group 10 and the second array element group 20, and the first array element group 10 and the second array element group 20 are centrally symmetrical based on the rectangular slot 30. A folded slot 102 is provided between each two adjacent array elements in the first array element group 10 and the second array element group 20, and the distance between the folded slot 102 and the two adjacent array elements is equal. The folded slot 102 includes a short transverse slot and a long longitudinal slot, and the short transverse slot and the long longitudinal slot are cross-circularly connected. The length of the short transverse slot is 2 mm, the length of the long longitudinal slot is 3 mm, and the width of the short transverse slot and the long longitudinal slot are both 1 mm. The virtual array element 104 is located at both ends of the single-layer broadband microstrip patch antenna array 01, and the working array element 103 is located between the virtual array elements 104; the working array element 103 and the virtual array element 104 have the same size. The virtual array element 104 is matched with a 50 ohm patch resistor 1041. The interval between the working array element 103 and the virtual array element 104 is 27 mm, the width of the working array element 103 and the virtual array element 104 is 35 mm, the overall length of the antenna array is 160 mm, the overall width of the antenna array is 35 mm, and the height of the antenna array is 2 mm. The working array element 103 and the virtual array element 104 are both single-layer dielectric substrate microstrip patch antennas, which include a single-layer dielectric substrate, a rectangular patch antenna unit 1011, a feeding transmission line 1012 and a symmetric transmission line 1013; the rectangular patch antenna unit 1011, the feeding transmission line 1012 and the symmetric transmission line 1013 are all arranged on the first copper clad layer of the single-layer dielectric substrate, and the rectangular slot 30 is arranged on the second copper clad layer of the single-layer dielectric substrate; the feeding transmission line 1012 and the symmetric transmission line 1013 are located at both ends of the rectangular patch antenna unit 1011, and the feeding transmission line 1012 and the symmetric transmission line 1013 are centrally symmetric relative to the rectangular patch antenna unit 1011, and the feeding transmission line 1012 and the symmetric transmission line 1013 are both T-type transmission lines. The head of the T-type feeding transmission line 1012 is 18.1 mm long and 2 mm wide, the tail of the T-type feeding transmission line 1012 is 8 mm long and 2.5 mm wide, and the interval between the T-type feeding transmission line 1012 and the radiation side of the adjacent rectangular patch antenna unit 1011 is 1.75 mm. The radiation side of the rectangular patch antenna unit 1011 is 18.5 mm long and the non-radiation side is 17.5 mm long.

[0064] In this embodiment, if Figure 6As shown, after experimental verification, the return loss value of a working array element 103 in the above-mentioned single-layer broadband microstrip patch antenna array 01 is not greater than -10dB. The bandwidth is 4.65~5.05dB, and the absolute bandwidth of the above-mentioned single-layer broadband microstrip patch antenna array 01 reaches 400M, and the relative bandwidth relative to the center frequency exceeds 8%. Among them, the return loss is the reflection caused by the impedance mismatch of the cable link, which is the reflection of a pair of lines themselves. The return loss is the ratio of the reflected wave power at the transmission line port to the incident wave power, expressed in logarithmic absolute value, the unit is dB, and the larger the absolute value of the return loss, the better.

[0065] In this embodiment, if Figure 7 As shown, at the 4.9G frequency, the working array element 103 has a maximum phase consistency difference of about 20° between two working array elements 103 in the same array element group within the angle range of -60° to 60° on the horizontal section; and the maximum phase consistency difference between two working array elements 103 in different array element groups is about 200° because they contain an anti-phase 180° phase value. Figure 8 As shown, at the 4.9G frequency, the maximum difference in phase consistency between two elements of the same array element group within the horizontal section angle range of -60° to 60° is about 20°, and the maximum difference in phase consistency between two elements of the same array element group within the horizontal section angle range of -40° to 40° is about 10°.

[0066] When the folded slot 102 and the rectangular slot 30 are set on the single-layer broadband microstrip patch antenna array 01, as shown in FIG. Fig. 9 As shown, at a frequency of 4.85G, the isolation between the array elements 101 is -15.5dB; when the folded gap 102 and the rectangular gap 30 are not set on the single-layer broadband microstrip patch antenna array 01, as shown in FIG. Fig.10 As shown, at a frequency of 4.85G, the isolation between the array elements 101 is -12.5dB. Comparing the above two cases, when the folded slot 102 and the rectangular slot 30 are provided on the single-layer broadband microstrip patch antenna array 01, the isolation is improved by about 3dB.

[0067] In addition, in one embodiment, a communication device is provided. The communication device includes the single-layer broadband microstrip patch antenna array as described in the above embodiments.

[0068] Optionally, the communication device includes any communication device such as a satellite, a radio station, a wireless local area network, a mobile phone, a computer, a television, a telephone, and an optical transmitter. Optionally, the communication device in this embodiment can be a wireless communication device or a wired communication device. This embodiment does not limit the type of communication device. In addition, the structure and working principle of the single-layer broadband microstrip patch antenna array 01 included in the communication device provided in this embodiment, please refer to the detailed description of the single-layer broadband microstrip patch antenna array 01 in the above embodiment, and this embodiment will not be repeated here.

[0069] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A single-layer broadband microstrip patch antenna array, characterized in that: The single-layer broadband microstrip patch antenna array comprises: a first array element group, a second array element group and a rectangular gap; the first array element group and the second array element group each comprise at least two array elements, and a folded gap is provided between each two adjacent array elements in the first array element group and the second array element group, and the distance between the folded gap and the two adjacent array elements is equal; The at least one array element is a single-layer dielectric substrate microstrip patch antenna, and the single-layer dielectric substrate microstrip patch antenna includes a single-layer dielectric substrate, a rectangular patch antenna unit, a feeding transmission line and a symmetric transmission line; the rectangular patch antenna unit, the feeding transmission line and the symmetric transmission line are all arranged on the first copper-clad layer of the single-layer dielectric substrate, and the rectangular slot is arranged on the second copper-clad layer of the single-layer dielectric substrate; the feeding transmission line and the symmetric transmission line are located at two ends of the rectangular patch antenna unit, and the feeding transmission line and the symmetric transmission line are centrally symmetric with respect to the rectangular patch antenna unit; The rectangular gap is located between the first array element group and the second array element group, and the first array element group and the second array element group are centrally symmetric based on the rectangular gap.

2. The single-layer broadband microstrip patch antenna array according to claim 1, characterized in that: The feeding transmission line is a T-shaped feeding transmission line, the symmetrical transmission line is a T-shaped symmetrical transmission line, and the T-shaped feeding transmission line and the T-shaped symmetrical transmission line have the same shape.

3. The single-layer broadband microstrip patch antenna array according to claim 1, characterized in that: The folding gaps include short transverse gaps and long longitudinal gaps, and the short transverse gaps and the long longitudinal gaps are cross-circulated and connected.

4. The single-layer broadband microstrip patch antenna array according to claim 1, characterized in that: The length of the folded gap is determined by a half wavelength of an operating frequency of the at least one array element.

5. The single-layer broadband microstrip patch antenna array according to any one of claims 1 or 2, characterized in that: The first array element group and the second array element group each include at least one working array element and one dummy array element, the dummy array elements are located at two ends of the single-layer broadband microstrip patch antenna array, and the working array element is located between the dummy array elements; the working array element and the dummy array element have the same size.

6. The single-layer broadband microstrip patch antenna array according to claim 5, characterized in that: The virtual array elements are matched by using chip resistors, or by using an SMA connector plus a matching load.

7. The single-layer broadband microstrip patch antenna array according to claim 5, characterized in that: The interval between adjacent array elements is determined by a half wavelength of an operating frequency of the at least one array element.

8. A communication device, characterized in that: It comprises a single-layer broadband microstrip patch antenna array as described in any one of claims 1 to 7.

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