High-stability phase center UWB antenna

Abstract

The utility model discloses a high-stability phase center UWB antenna, which comprises a dielectric substrate, a metal pole plate is arranged on one side of the dielectric substrate, a conical groove is arranged on the metal pole plate, and the metal pole plate is divided into a first area and a second area by the conical groove. A first comb tooth structure and a second comb tooth structure which are arranged at intervals are arranged on the side, away from the second area, of the first area, a third comb tooth structure and a fourth comb tooth structure which are arranged at intervals are arranged on the side, away from the first area, of the second area, and a microstrip line coupled with the conical groove is arranged on the other side of the dielectric substrate. The high-stability phase center UWB antenna is a Vivaldi broadband antenna, and compared with a traditional Vivaldi antenna, the high-stability phase center UWB antenna changes along with the frequency, the fluctuation of deviation of the phase center from the geometric center is small (approaching to 0), the high-stability phase center UWB antenna has very high phase center stability, and the positioning precision of the UWB antenna can be effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of antennas, in particular to a high-stability phase center UWB antenna. Background Art

[0002] With the development of smart wearable products, people have higher and higher requirements for indoor positioning, so UWB antennas are used for high-precision positioning.

[0003] With the development of the global navigation satellite system (GNSS), antennas are increasingly used in satellite synthetic aperture radar, satellite positioning, navigation and other technologies. They all use the phase center as the measurement reference or imaging reference. The phase center offset of the antenna will have a serious impact on them. Therefore, the research on antennas with high stability phase center is becoming more and more important.

[0004] Figure 1 A traditional Vivaldi antenna is shown, which includes a dielectric substrate 1, a metal plate 2 is provided on one side of the dielectric substrate 1, a conical groove 21 is provided on the metal plate 2, and a microstrip line 3 coupled to the conical groove 21 is provided on the other side of the dielectric substrate 1. When the traditional Vivaldi antenna is applied to the UWB frequency band, its phase center usually changes dramatically with the frequency, so that it brings trouble to high-precision positioning measurement. Specifically, in the classical radar measurement theory, when the phase center coincides with the geometric center, the distance measured by the antenna is the geometric center distance, and when the antenna is actually working, the distance between the two antennas is the distance of the phase center, but when the phase center does not coincide with the geometric center, the measurement value will produce a lot of errors, so that the positioning measurement data is inaccurate. The phase center of the traditional Vivaldi antenna changes dramatically with the frequency, so that the positioning measurement data accuracy is low. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a high-stability phase center UWB antenna.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-stability phase center UWB antenna, including a dielectric substrate, a metal electrode plate is provided on one side of the dielectric substrate, a conical groove is provided on the metal electrode plate, the conical groove separates the metal electrode plate into a first area and a second area, the first area has a first comb tooth structure and a second comb tooth structure arranged at intervals on a side away from the second area, the second area has a third comb tooth structure and a fourth comb tooth structure arranged at intervals on a side away from the first area, and a microstrip line coupled to the conical groove is provided on the other side of the dielectric substrate.

[0007] In one embodiment, the first comb tooth structure is symmetrically arranged with the third comb tooth structure; the second comb tooth structure is symmetrically arranged with the fourth comb tooth structure.

[0008] In one embodiment, a side of the first region away from the second region has a plurality of first rectangular grooves arranged side by side, and the spacing between any two adjacent first rectangular grooves is the same to form the first comb tooth structure; a side of the second region away from the first region has a plurality of third rectangular grooves arranged side by side, and the spacing between any two adjacent third rectangular grooves is the same to form the third comb tooth structure.

[0009] In one embodiment, among two adjacent first rectangular grooves, the length of the first rectangular groove close to the microstrip line is smaller than the length of the first rectangular groove far from the microstrip line; among two adjacent third rectangular grooves, the length of the third rectangular groove close to the microstrip line is smaller than the length of the third rectangular groove far from the microstrip line.

[0010] In one embodiment, a side of the first region away from the second region has a plurality of second rectangular grooves arranged side by side, and the spacing between any two adjacent second rectangular grooves is the same to form the second comb tooth structure; a side of the second region away from the first region has a plurality of fourth rectangular grooves arranged side by side, and the spacing between any two adjacent fourth rectangular grooves is the same to form the fourth comb tooth structure.

[0011] In one embodiment, of two adjacent second rectangular grooves, the length of the second rectangular groove close to the microstrip line is greater than the length of the second rectangular groove far from the microstrip line; of two adjacent fourth rectangular grooves, the length of the fourth rectangular groove close to the microstrip line is greater than the length of the fourth rectangular groove far from the microstrip line.

[0012] In one embodiment, the distance between the first comb-tooth structure and the microstrip line is smaller than the distance between the second comb-tooth structure and the microstrip line.

[0013] The beneficial effect of the present invention is that the high-stability phase center UWB antenna is a Vivaldi wideband antenna. Compared with the traditional Vivaldi antenna, the high-stability phase center UWB antenna changes with frequency, the fluctuation of the phase center from the geometric center is small (approaching 0), and it has very high phase center stability, which can effectively ensure the positioning accuracy of the UWB antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0015] Figure 1 is a perspective view of a prior art UWB antenna;

[0016] Figure 2 A perspective view of a high stability phase center UWB antenna according to a first embodiment of the utility model;

[0017] Figure 3 A comparison diagram of the UWB antenna S parameters before and after modification;

[0018] Figure 4 A comparison diagram of the UWB antenna gain before and after modification;

[0019] Figure 5 This is a comparison diagram of the distance curves of the phase center of the UWB antenna before and after modification that deviate from the geometric center as the frequency changes.

[0020] Description of Figure Numbers:

[0021] 1. Dielectric substrate;

[0022] 2. Metal plate; 21. Conical groove; 22. First comb tooth structure; 23. Second comb tooth structure; 24. Third comb tooth structure; 25. Fourth comb tooth structure;

[0023] 3. Microstrip line. DETAILED DESCRIPTION

[0024] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0028] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0029] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0030] Embodiment 1

[0031] Please refer to Figures 2 to 5 , Embodiment 1 of the present utility model is: Figure 2 As shown, a high-stability phase center UWB antenna includes a dielectric substrate 1, a metal plate 2 is provided on one side of the dielectric substrate 1, a conical groove 21 is provided on the metal plate 2, the conical groove 21 divides the metal plate 2 into a symmetrical first area and a second area, the first area has a first comb tooth structure 22 and a second comb tooth structure 23 arranged at intervals on a side away from the second area, the second area has a third comb tooth structure 24 and a fourth comb tooth structure 25 arranged at intervals on a side away from the first area, and a microstrip line 3 coupled to the conical groove 21 is provided on the other side of the dielectric substrate 1.

[0032] The first comb tooth structure 22 and the third comb tooth structure 24 are symmetrically arranged; the second comb tooth structure 23 and the fourth comb tooth structure 25 are symmetrically arranged; the distance between the first comb tooth structure 22 and the microstrip line 3 is smaller than the distance between the second comb tooth structure 23 and the microstrip line 3.

[0033] Specifically, the first region has a plurality of first rectangular grooves arranged side by side on one side away from the second region, and the spacing between any two adjacent first rectangular grooves is the same to form the first comb tooth structure 22; the second region has a plurality of third rectangular grooves arranged side by side on one side away from the first region, and the spacing between any two adjacent third rectangular grooves is the same to form the third comb tooth structure 24.

[0034] In this embodiment, among two adjacent first rectangular grooves, the length of the first rectangular groove close to the microstrip line 3 is smaller than the length of the first rectangular groove far away from the microstrip line 3; among two adjacent third rectangular grooves, the length of the third rectangular groove close to the microstrip line 3 is smaller than the length of the third rectangular groove far away from the microstrip line 3.

[0035] In detail, the first region has a plurality of second rectangular grooves arranged side by side on one side away from the second region, and the spacing between any two adjacent second rectangular grooves is the same to form the second comb tooth structure 23; the second region has a plurality of fourth rectangular grooves arranged side by side on one side away from the first region, and the spacing between any two adjacent fourth rectangular grooves is the same to form the fourth comb tooth structure 25.

[0036] In this embodiment, among two adjacent second rectangular grooves, the length of the second rectangular groove close to the microstrip line 3 is greater than the length of the second rectangular groove far away from the microstrip line 3; among two adjacent fourth rectangular grooves, the length of the fourth rectangular groove close to the microstrip line 3 is greater than the length of the fourth rectangular groove far away from the microstrip line 3.

[0037] Figure 3 The S parameters of the UWB antenna before and after modification are compared. The UWB antenna before modification refers to Figure 1 The Vivaldi antenna of the structure shown, the modified UWB antenna refers to Figure 2 The Vivaldi antenna of the structure shown, the difference between the UWB antenna before modification and the UWB antenna after modification is that the modified UWB antenna has a first comb tooth structure, a second comb tooth structure, a third comb tooth structure and a fourth comb tooth structure.

[0038] Figure 4 This is a comparison chart of the UWB antenna gain before and after modification; it should be noted that, Figure 4 In the figure, “before modification” refers to the UWB antenna before modification, and “after modification” refers to the UWB antenna after modification.

[0039] pass Figure 3 and Figure 4 It can be seen that the electrical performance of the UWB antenna before and after the modification remains basically unchanged.

[0040] Figure 5 The comparison diagram of the distance curve of the phase center of the UWB antenna before modification and the modified UWB antenna deviating from the geometric center as the frequency changes; Figure 5 It can be seen that the modified UWB antenna has a small fluctuation (close to 0) in phase center deviation from the geometric center as the frequency changes, and it has a high phase center stability, which can effectively ensure the positioning accuracy of the UWB antenna. Figure 5 In the figure, “before improvement” refers to the UWB antenna before modification, and “after improvement” refers to the UWB antenna after modification.

[0041] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. High stability phase center UWB antenna, characterized by: The invention comprises a dielectric substrate, a metal plate is provided on one side of the dielectric substrate, a conical groove is provided on the metal plate, the conical groove divides the metal plate into a first area and a second area, a first area away from the second area has a first comb tooth structure and a second comb tooth structure arranged at intervals, a second area away from the first area has a third comb tooth structure and a fourth comb tooth structure arranged at intervals, and a microstrip line coupled to the conical groove is provided on the other side of the dielectric substrate.

2. The high stability phase center UWB antenna according to claim 1, characterized in that: The first comb tooth structure is symmetrically arranged with the third comb tooth structure; the second comb tooth structure is symmetrically arranged with the fourth comb tooth structure.

3. The high stability phase center UWB antenna according to claim 2, characterized in that: The first area has a plurality of first rectangular grooves arranged side by side on a side away from the second area, and the spacing between any two adjacent first rectangular grooves is the same to form the first comb tooth structure; the second area has a plurality of third rectangular grooves arranged side by side on a side away from the first area, and the spacing between any two adjacent third rectangular grooves is the same to form the third comb tooth structure.

4. The high stability phase center UWB antenna according to claim 3, characterized in that: Among two adjacent first rectangular grooves, the length of the first rectangular groove close to the microstrip line is shorter than the length of the first rectangular groove far from the microstrip line; among two adjacent third rectangular grooves, the length of the third rectangular groove close to the microstrip line is shorter than the length of the third rectangular groove far from the microstrip line.

5. The high stability phase center UWB antenna according to claim 2, characterized in that: The first region has a plurality of second rectangular grooves arranged side by side on one side away from the second region, and the spacing between any two adjacent second rectangular grooves is the same to form the second comb tooth structure; the second region has a plurality of fourth rectangular grooves arranged side by side on one side away from the first region, and the spacing between any two adjacent fourth rectangular grooves is the same to form the fourth comb tooth structure.

6. The high stability phase center UWB antenna according to claim 5, characterized in that: Among two adjacent second rectangular grooves, the length of the second rectangular groove close to the microstrip line is greater than the length of the second rectangular groove far from the microstrip line; among two adjacent fourth rectangular grooves, the length of the fourth rectangular groove close to the microstrip line is greater than the length of the fourth rectangular groove far from the microstrip line.

7. The high stability phase center UWB antenna according to claim 2, characterized in that: The distance between the first comb-tooth structure and the microstrip line is smaller than the distance between the second comb-tooth structure and the microstrip line.

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