Wide-beam self-decoupled microstrip antenna

Abstract

The application relates to the technical field of antennas, in particular to a wide-beam self-decoupling microstrip antenna. The wide-beam self-decoupling microstrip antenna comprises a metal floor, a dielectric substrate, two patch units and two coaxial line feedings; the patch unit comprises a main rectangular patch and four auxiliary patches, and a metal short-circuit column is arranged in the substrate below the auxiliary patch. The self-decoupling characteristic of the small-sized antenna is endowed, high-isolation array work under an extremely small center spacing is realized on the single-layer substrate, the antenna array size is small, the antenna array has a wide-beam radiation pattern, and the wide-beam self-decoupling microstrip antenna is suitable for indoor wireless communication limited in space, such as an optical fiber indoor application scene.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a wide-beam self-decoupling microstrip antenna. BACKGROUND

[0002] In a space-limited indoor wireless communication scenario, such as fiber-to-the-home, in order to ensure signal coverage range and network performance, a highly isolated wide-beam antenna array needs to be tightly packaged in a limited space. The coupling suppression problem between antenna elements is an important problem in design. The mutual coupling effect will cause distortion of the antenna pattern, deterioration of input impedance matching, etc. The traditional method of improving the isolation level by decoupling structure will increase the complexity of the antenna array structure and occupy additional space. With the development trend of miniaturization and compactness of antenna arrays, self-decoupling antennas naturally have good isolation level without adding additional structures, which has attracted people's attention. SUMMARY

[0003] The purpose of the present application is to provide a wide-beam self-decoupling microstrip antenna to solve the design problem of high-isolation antenna array in a space-limited indoor wireless communication scenario.

[0004] The purpose of the present application is achieved by the technical scheme, which comprises a metal floor, a dielectric substrate, two patch elements and two coaxial line feedings.

[0005] The metal floor is attached to the lower end surface of the dielectric substrate, and the two patch elements are symmetrically attached to the upper end surface of the dielectric substrate with the center line of the dielectric substrate as the symmetry axis.

[0006] The patch element comprises a main rectangular patch, and a rectangular protrusion is symmetrically arranged at the center position of the opposite two edges of the main rectangular patch. A first gap is provided between the two adjacent rectangular protrusions of the two patch elements, and the design is symmetric with the center line of the dielectric substrate.

[0007] The two coaxial line feedings are arranged below the dielectric substrate, and the outer conductor of the coaxial line feeding is connected with the metal floor. The inner conductor of the coaxial line feeding is connected with the lower end surface of the two adjacent rectangular protrusions of the two patch elements, respectively.

[0008] The patch element further comprises four short-circuit branches respectively located at the four corners of the main rectangular patch, and each short-circuit branch comprises an auxiliary patch and a metal short-circuit column. An auxiliary patch is arranged on each of the two opposite sides of each rectangular protrusion, and the auxiliary patch maintains a second gap with the main rectangular patch and the rectangular protrusion. The end of the auxiliary patch away from the rectangular protrusion extends out of the side edge of the main rectangular patch, and a metal short-circuit column is arranged in the substrate below the auxiliary patch.

[0009] Further, the resistance of the two coaxial line feedings is 50Ω.

[0010] Further, the medium substrate has a length of 46 mm, a width of 30 mm, and a thickness of 3 mm, the material of the medium substrate is F4B, the relative dielectric constant is 2.2, the relative permeability is 1.0, and the loss tangent is 0.0009.

[0011] The symmetry line of the two patch units is located at the center of the long side of the medium substrate.

[0012] Further, the first gap has a spacing of 0.15 mm.

[0013] Further, the two edges of the rectangular protrusion of the main rectangular patch have a length of 10 mm, and the other two edges have a length of 7.4 mm.

[0014] The protruding length of the rectangular protrusion is 2.15 mm, and the width of the rectangular protrusion is 2.4 mm.

[0015] The connection point of the rectangular protrusion and the coaxial line feed has a spacing of 1.8 mm from the edge of the rectangular protrusion.

[0016] Further, the auxiliary patch has a length of 4.3 mm and a width of 1 mm.

[0017] One end of the auxiliary patch connected with the metal short-circuit column is a circular metal disc, the metal short-circuit column is a cylinder, the radius of the circular metal disc is 0.7 mm, and the radius of the metal short-circuit column is 0.5 mm.

[0018] Further, the second gap has a spacing of 0.15 mm.

[0019] Due to the adoption of the above technical solutions, the present application has the following advantages:

[0020] 1. The addition of the short-circuit stub greatly reduces the size of the patch unit, and since they are close enough to the main rectangular patch, they can be well excited, and the radiation pattern is superimposed by the radiation of the short-circuit stub and the main rectangular patch to form a wide-beam radiation pattern.

[0021] 2. The short-circuit stub near the center line and the gap can form a coupled resonator bandpass filter, the transmission response of which is opposite in phase and the same in amplitude to the original coupling path, and can be mutually offset, greatly improving the isolation level of the two patch units and having a self-decoupling characteristic.

[0022] 3. On a single-layer substrate, high-isolation operation is achieved at a very small patch unit spacing, and the center spacing is less than one-quarter of the free-space wavelength, greatly reducing the size of the antenna and having a wide-beam radiation pattern, suitable for indoor wireless communication scenarios with limited space.

[0023] Additional advantages, objects, and features of the application will be apparent from the following specification and drawings, and from the foregoing teachings, or can be learned by practice of the application. The objects and other advantages of the application can be realized and attained by the structure particularly pointed out in the specification and claims hereof. BRIEF DESCRIPTION OF DRAWINGS

[0024] The drawings accompanying the specification are included as part of, and are to be taken in conjunction with, the specification, and illustrate various embodiments of the application.

[0025] Figure 1 is a schematic diagram of the antenna of the present application.

[0026] Figure 2 is a top view of the antenna of the present application.

[0027] Figure 3 is a front view of the antenna of the present application.

[0028] Figure 4 is a plot of the S parameters of the antenna of the present application.

[0029] Figure 5 is a plot of the efficiency versus ECC of the antenna of the present application.

[0030] Figure 6 is a plot of the xz and yz radiation patterns of the antenna of the present application at 5.887 GHz, with only port 1 excited.

[0031] Figure 7 is a plot of the xz and yz radiation patterns of the antenna of the present application at 5.887 GHz, with only port 2 excited. DETAILED DESCRIPTION

[0032] The application will be further described with reference to the drawings and examples.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0034] A wide-beam self-decoupling microstrip antenna, as shown in Figure 1 、 Figure 2 、 Figure 3 includes a metal floor 1, a dielectric substrate 2, two patch units and two coaxial line feeds 3;

[0035] The metal floor 1 is attached to the lower end surface of the dielectric substrate 2, and the two patch units are symmetrically attached to the upper end surface of the dielectric substrate 2 with the center line of the dielectric substrate 2 as the symmetry axis;

[0036] The patch unit includes a main rectangular patch 4, and a rectangular protrusion is symmetrically arranged at the center position of the two opposite edges of the main rectangular patch 4. The first gap is provided between the two adjacent rectangular protrusions of the two patch units, and the design is symmetric with the center line of the dielectric substrate 2 as the symmetry axis;

[0037] The two coaxial line feeds 3 are arranged below the dielectric substrate 2, and the outer conductor of the coaxial line feed 3 is connected with the metal floor 1; the inner conductor of the coaxial line feed 3 is connected with the lower end surface of the two adjacent rectangular protrusions of the two patch units, respectively;

[0038] The patch unit further includes four short-circuit branches respectively located at the four corners of the main rectangular patch, each short-circuit branch includes an auxiliary patch and a metal short-circuit column 5; each rectangular protrusion is provided with an auxiliary patch on the opposite two side edges, and the auxiliary patch maintains a second gap with the main rectangular patch 4 and the rectangular protrusion; the end of the auxiliary patch away from the rectangular protrusion extends out of the side edge of the main rectangular patch 4, and a metal short-circuit column 5 is arranged in the substrate below the auxiliary patch.

[0039] Two coaxial feed 3 resistance is 50 Ω.

[0040] As Figure 2 shown, the specific parameters of the wide-beam self-decoupling microstrip antenna are as shown in the following table:

[0041]

[0042] According to the above parameters, using HFSS2020 to simulate and analyze the S parameters, directional radiation gain and other characteristic parameters of the designed wide-beam miniaturized self-decoupling microstrip antenna array, the analysis results are as follows:

[0043] Figure 4 The S parameter curve of the present application with frequency changes, the -10dB impedance bandwidth range is 5.794 to 5.997GHz, and the relative bandwidth is 3.44%. The isolation level is good within the bandwidth, and the minimum value of |S 21 | is -46.55dB, which is located at 5.887GHz.

[0044] Figure 5 The efficiency and ECC curve of the present application with frequency changes, the average efficiency within the working bandwidth is 97.02%, and the ECC is less than 0.004.

[0045] Figure 6 The radiation patterns of xz and yz planes at 5.887GHz frequency point of the present application when only port 1 is excited. At this time, the self-decoupling antenna array radiates a half-power beamwidth HPBW of 142° in the xz plane, and a wide-beam radiation pattern in the yz plane. The HPBW is 89°. The maximum gain of the antenna array is 5.48dBi.

[0046] Figure 7 The radiation patterns of xz and yz planes at 5.887GHz frequency point of the present application when only port 2 is excited. At this time, the self-decoupling antenna array radiates a half-power beamwidth HPBW of 142° in the xz plane, and a wide-beam radiation pattern in the yz plane. The HPBW is 89°. The maximum gain of the antenna array is 5.48dBi.

[0047] In summary, the antenna profile height is low, the impedance matching range is 5.794 to 5.997GHz, and high isolation and wide-beam radiation are realized under the single-layer structure with ultra-small unit spacing, which has good impedance matching characteristics and better and stable radiation patterns.

[0048] It should be pointed out finally that the above embodiments are only used to illustrate the technical solutions of the present application but not to limit it. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the specific embodiments of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, and any modification or equivalent replacement without departing from the spirit and scope of the present application should be covered in the protection scope of the claims of the present application.

Claims

1. A wide-beam self-decoupled microstrip antenna, characterized by, The metal floor, the dielectric substrate, two patch units and two coaxial line feeders are included. The metal floor is attached to the lower end surface of the dielectric substrate, and the two patch units are symmetrically attached to the upper end surface of the dielectric substrate along the center line of the dielectric substrate. Each of the patch units includes a main rectangular patch, and a rectangular protrusion is arranged at the center of each of the two opposite sides of the main rectangular patch. The two coaxial line feeders are arranged below the dielectric substrate, and the outer conductor of the coaxial line feeder is connected to the metal floor. The patch unit further includes four short-circuit branches respectively arranged at the four corners of the main rectangular patch, and each of the short-circuit branches includes an auxiliary patch and a metal short-circuit column.

2. The wide-beam self-decoupling microstrip antenna of claim 1, wherein, The impedance of the two coaxial line feeders is 50Ω.

3. The wide-beam self-decoupled microstrip antenna of claim 1, wherein, The length of the dielectric substrate is 46mm, the width is 30mm, and the thickness is 3mm.

4. The wide-beam self-decoupling microstrip antenna of claim 1, wherein, The length of the two long sides of the main rectangular patch provided with the rectangular protrusion is 10mm, and the length of the two short sides not provided with the rectangular protrusion is 7.4mm.

5. The wide-beam self-decoupling microstrip antenna of claim 1, wherein, The protruding length of the rectangular protrusion is 2.15mm, and the width of the rectangular protrusion is 2.4mm. The distance between the connection point of the rectangular protrusion and the edge of the rectangular protrusion close to the first gap is 1.8mm. The length of the auxiliary patch is 4.3mm, and the width is 1mm.

6. The wide-beam self-decoupling microstrip antenna of claim 1, wherein, The end of the auxiliary patch connected to the metal short-circuit column is formed into a circular metal disc, the metal short-circuit column is in a cylindrical shape, the radius of the circular metal disc is 0.7mm, and the radius of the metal short-circuit column is 0.5mm. The distance of the second gap is 0.15mm.

7. The wide-beam self-decoupling microstrip antenna of claim 1, wherein, ​

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