UWB circularly polarized ultra-wideband antenna

Abstract

The utility model discloses a UWB circularly polarized UWB antenna, comprising a dielectric substrate, the top surface of which is provided with a square metal radiation sheet and a top metal floor surrounding the metal radiation sheet. The central area of the metal radiation sheet is provided with an annular groove which takes the physical center of the metal radiation sheet as the circle center and is provided with an opening, each edge of the metal radiation sheet is provided with a gap, the bottom surface of the dielectric substrate is provided with a bottom layer metal floor and a feed sheet, the dielectric substrate is internally provided with a feed column and a plurality of grounding columns, and the feed column and the grounding columns are connected with the metal radiation sheet. The two ends of the grounding column are connected with the top layer metal floor and the bottom layer metal floor respectively, and the feed column is connected with the physical center of the metal radiation sheet and the feed sheet. The UWB circularly polarized ultra wide band antenna is excellent in performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of antenna, especially relates to a UWB circular polarization ultra wide band antenna. BACKGROUND

[0002] In recent years, with the increasingly mature development of UWB technology, UWB communication technology has been widely applied in various fields, such as indoor positioning, unmanned vehicles, industrial automation, angle and distance measurement of automobile keys and other application fields.

[0003] With the increasingly mature research of this technology, the design of UWB antenna has also had new understanding, and UWB technology needs to realize high-precision ranging and angle measurement, so the performance requirements of the antenna are different from the requirements of traditional consumer electronic antennas, since the pulse time width of UWB technology is extremely short, in order to realize ultra wide band on the frequency spectrum, in addition to the requirements of low return loss, high gain and high radiation efficiency of the antenna, the antenna also needs to have a very wide bandwidth of more than 500MHz, and in order to realize high-precision angle measurement, the UWB antenna needs to have small phase fluctuation and stable phase center. SUMMARY

[0004] The utility model solves the technical problem for providing a kind of high-performance UWB circular polarization ultra wide band antenna.

[0005] In order to solve the above technical problems, the utility model adopts the technical scheme that a kind of UWB circular polarization ultra wide band antenna, including dielectric substrate, the top surface of the dielectric substrate is provided with square metal radiation sheet and the top layer metal floor that is arranged around the metal radiation sheet, the central region of the metal radiation sheet is provided with the circular groove with opening with the physical center of the metal radiation sheet as the center, each edge of the metal radiation sheet is provided with slit, the bottom surface of the dielectric substrate is provided with bottom layer metal floor and feed sheet, the dielectric substrate is provided with feed column and multiple ground columns, the two ends of the ground column are connected with the top layer metal floor and bottom layer metal floor respectively, the feed column is connected with the physical center of the metal radiation sheet and the feed sheet.

[0006] In an embodiment, the slit is in the form of a long strip, and the slit is perpendicular to the edge of the metal radiation sheet to which it is connected.

[0007] In an embodiment, the number of slits connected to a single edge of the metal radiation sheet is one or more.

[0008] In an embodiment, the lengths of at least two slits are different.

[0009] In an embodiment, a set of opposite edges of the metal radiation sheet are connected with one of the slots respectively, and another set of opposite edges of the metal radiation sheet are connected with two of the slots respectively, and a plurality of the slots form an axial symmetric structure on the metal radiation sheet.

[0010] In an embodiment, an isolation gap in the shape of a rectangular frame is formed between the top metal floor and the metal radiation sheet.

[0011] In an embodiment, a plurality of the grounding columns are arranged in two ring frame structures, one of the ring frame structures is arranged close to an inner edge of the top metal floor, and the other ring frame structure is arranged close to an outer edge of the top metal floor.

[0012] In an embodiment, an isolation groove is formed between the feeding sheet and the bottom metal floor.

[0013] In an embodiment, a mounting avoiding groove is further arranged on the bottom metal floor, and the mounting avoiding groove is communicated with the isolation groove.

[0014] The UWB circular polarization ultra-wideband antenna has the advantages that the structure is novel and simple, the processing technology is simple, the production cost is low, and the batch production is easy, the UWB circular polarization ultra-wideband antenna expands the bandwidth of the antenna by arranging the slots and the circular ring groove with the opening on the metal radiation sheet, the multiple index requirements of the antenna are met, the phase center of the antenna is stable, and the antenna can meet the use in various application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings shown.

[0016] Figure 1 It is a perspective view of the UWB circular polarization ultra-wideband antenna of the embodiment one of the present application.

[0017] Figure 2 It is a structure schematic diagram of the UWB circular polarization ultra-wideband antenna of the embodiment one of the present application. Figure 1 ;

[0018] Figure 3 It is a structure schematic diagram of the UWB circular polarization ultra-wideband antenna of the embodiment one of the present application. Figure 2 ;

[0019] Figure 4The S parameter diagram of the UWB circularly polarized ultra-wideband antenna of embodiment one is shown.

[0020] Figure 5 The H-plane radiation pattern of the UWB circularly polarized ultra-wideband antenna of embodiment one at 8GHz is shown.

[0021] Figure 6 The E-plane radiation pattern of the UWB circularly polarized ultra-wideband antenna of embodiment one at 8GHz is shown,

[0022] Figure 7 The axial ratio performance index diagram of the UWB circularly polarized ultra-wideband antenna of embodiment one is shown.

[0023] Figure 8 The gain index diagram of the UWB circularly polarized ultra-wideband antenna of embodiment one is shown.

[0024] Explanation of reference numerals:

[0025] 1, dielectric substrate;

[0026] 2, metal radiation sheet; 21, circular ring groove; 22, connecting part; 23, slot;

[0027] 3, top layer metal floor;

[0028] 4, isolation gap;

[0029] 5, bottom layer metal floor; 51, isolation groove; 52, mounting avoiding groove;

[0030] 61, feeding sheet; 62, feeding column;

[0031] 7, grounding column. DETAILED DESCRIPTION

[0032] The purposes, functional features and advantages of the utility model will be further explained in combination with embodiments and with reference to the drawings.

[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0034] It should be noted that if the embodiments of the utility model involve directional indications such as up, down, left, right, front, back, etc., the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture such as shown in the drawings, and if the specific posture changes, the directional indications also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0036] Furthermore, if the meaning of "and / or" appears throughout the text, it refers to three parallel solutions. For example, "and / or" includes solution 1, solution 2, and solution 3, which simultaneously satisfy the above conditions. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] Example 1

[0039] Please refer to Figures 1 to 8 Embodiment 1 of this utility model is as follows: Figures 1 to 3 As shown, a UWB circularly polarized ultra-wideband antenna includes a dielectric substrate 1. The top surface of the dielectric substrate 1 is provided with a square metal radiator 2 and a top metal ground plane 3 surrounding the metal radiator 2. A rectangular frame-shaped isolation gap 4 is formed between the top metal ground plane 3 and the metal radiator 2. The central region of the metal radiator 2 is provided with an open annular groove 21 centered on the physical center of the metal radiator 2. Each edge of the metal radiator 2 is provided with a slot 23. The bottom surface of the dielectric substrate 1 is provided with a bottom metal ground plane 5 and a feed plate 61. The dielectric substrate 1 is provided with a feed post 62 and a plurality of grounding posts 7. The two ends of the grounding posts 7 are respectively connected to the top metal ground plane 3 and the bottom metal ground plane 5 to conduct electricity between the top metal ground plane 3 and the bottom metal ground plane 5. The feed post 62 connects the physical center of the metal radiator 2 and the feed plate 61.

[0040] It is not difficult to understand that the area of the metal radiating sheet 2 at the opening of the circular groove 21 is called a connecting part 22, and the connecting part 22 connects the area of the metal radiating sheet 2 inside the circular groove 21 with the area outside the circular groove 21. In the present UWB circularly polarized ultra-wideband antenna, the circular groove 21 and the connecting part 22 on the metal radiating sheet 21 can jointly change the capacitive and inductive characteristics of the antenna, produce resonance in the required frequency band, thereby increasing the bandwidth of the antenna and realizing the broadbandization of the antenna; and the slot 23 on the metal radiating sheet 23 can excite two orthogonal modes with a phase difference of 90°, thereby realizing the circular polarization performance of the antenna.

[0041] In one or more embodiments, the slot 23 has other shapes, and in the present embodiment, the slot 23 has an elongated shape, and the slot 23 is perpendicular to the edge of the metal radiating sheet 2 to which the slot 23 is connected. By adjusting the length and width of the slot 23 on the metal radiating sheet 23, the antenna can be operated in different modes, resonance can be produced at different frequency points, and the bandwidth of the antenna can be increased.

[0042] The number of slots 23 connected to a single edge of the metal radiating sheet 2 is one or more. Optionally, at least two slots 23 have different lengths.

[0043] In the present embodiment, one slot 23 is connected to each of a group of opposite edges of the metal radiating sheet 2, and two slots 23 are connected to each of another group of opposite edges of the metal radiating sheet 2, and the six slots 23 form an axisymmetric structure on the metal radiating sheet 2.

[0044] In order to improve signal leakage and signal interference, a plurality of ground columns 7 are arranged in two ring frame structures, one of which is arranged near the inner edge of the top metal floor 3, and the other of which is arranged near the outer edge of the top metal floor 3.

[0045] The feed sheet 61 and the bottom metal floor 5 have an isolation groove 51 therebetween to avoid conduction between the feed sheet 61 and the bottom metal floor 5.

[0046] Optionally, the bottom metal floor 5 is further provided with a mounting avoidance groove 52, and the mounting avoidance groove 52 is connected to the isolation groove 51, and the isolation groove 51 can be used to set a connector or other structural member.

[0047] Figure 4 The S parameter diagram of the UWB circularly polarized ultra-wideband antenna of Embodiment 1 is shown, and the S parameter diagram of the UWB circularly polarized ultra-wideband antenna of Embodiment 2 is shown. Figure 4 It can be seen that the present UWB circularly polarized ultra-wideband antenna has a wide bandwidth.

[0048] Figure 5The radiation pattern of the UWB circularly polarized ultra-wideband antenna of embodiment one in the H plane at 8GHz is shown, Figure 6 The radiation pattern of the UWB circularly polarized ultra-wideband antenna of embodiment one in the E plane at 8GHz is shown, Figure 5 and Figure 6 It can be seen that the horizontal plane and vertical plane radiation patterns of the UWB circularly polarized ultra-wideband antenna at 8GHz are relatively uniform, and the 3dB beam width is wide.

[0049] Figure 7 The axial ratio performance index diagram of the UWB circularly polarized ultra-wideband antenna of embodiment one is shown, Figure 7 It can be seen that the circular polarization performance of the UWB circularly polarized ultra-wideband antenna is very good.

[0050] Figure 8 The gain index diagram of the UWB circularly polarized ultra-wideband antenna of embodiment one is shown, Figure 8 It can be seen that the UWB circularly polarized ultra-wideband antenna has high gain in the bandwidth range and excellent radiation performance.

[0051] The above is only an optional embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the attached drawings, or direct / indirect application in other related technical fields under the utility model concept of the utility model is included in the patent protection range of the utility model.

Claims

1. A UWB circularly polarized ultrawideband antenna, characterized in that: The substrate includes a dielectric substrate. The top surface of the dielectric substrate has a square metal radiating plate and a top metal ground plate surrounding the metal radiating plate. The central area of ​​the metal radiating plate has an open annular groove with the physical center of the metal radiating plate as the center. Each edge of the metal radiating plate has a gap. The bottom surface of the dielectric substrate has a bottom metal ground plate and a feed plate. The dielectric substrate has a feed post and a plurality of ground posts. The two ends of the ground posts are respectively connected to the top metal ground plate and the bottom metal ground plate. The feed post connects the physical center of the metal radiating plate to the feed plate.

2. The UWB circularly polarized ultra-wideband antenna according to claim 1, characterized in that: The slit is elongated and perpendicular to the edge of the metal radiating plate to which it is connected.

3. The UWB circularly polarized ultra-wideband antenna according to claim 2, characterized in that: The number of slits connected to a single edge of the metal radiating sheet is one or more.

4. The UWB circularly polarized ultrawideband antenna according to claim 2, characterized in that: At least two of the gaps have different lengths.

5. The UWB circularly polarized ultrawideband antenna according to claim 3, characterized in that: One set of opposite sides of the metal radiating sheet is connected to a slit, and another set of opposite sides of the metal radiating sheet is connected to two slits. The number of slits forms an axisymmetric structure on the metal radiating sheet.

6. The UWB circularly polarized ultra-wideband antenna according to claim 1, characterized in that: A rectangular frame-shaped isolation gap is formed between the top metal floor and the metal radiating sheet.

7. The UWB circularly polarized ultra-wideband antenna according to claim 6, characterized in that: The grounding posts, in multiple quantities, are arranged in two ring-shaped structures. One ring-shaped structure is located near the inner edge of the top metal floor, and the other ring-shaped structure is located near the outer edge of the top metal floor.

8. The UWB circularly polarized ultrawideband antenna according to claim 1, characterized in that: There is an isolation groove between the power supply plate and the underlying metal floor.

9. The UWB circularly polarized ultrawideband antenna according to claim 8, characterized in that: The bottom metal floor is also provided with an installation clearance groove, which is connected to the isolation groove.

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