CN218569220U - Vivaldi antenna applied to antenna test system - Google Patents
Vivaldi antenna applied to antenna test system Download PDFInfo
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- CN218569220U CN218569220U CN202222310572.2U CN202222310572U CN218569220U CN 218569220 U CN218569220 U CN 218569220U CN 202222310572 U CN202222310572 U CN 202222310572U CN 218569220 U CN218569220 U CN 218569220U
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Abstract
The utility model belongs to the technical field of the wireless communication technique and specifically relates to a be applied to antenna test system's Vivaldi antenna is related to, including the dielectric substrate, the mutual quadrature of dielectric substrate sets up, and the etching has the antenna radiation unit on the dielectric substrate, the antenna radiation unit includes the upper metal layer, middle level metal layer and lower floor's metal layer, and form Vivaldi antenna radiation structure on upper metal layer and the lower floor's metal layer, form feed structure on the middle metal layer and be connected with Vivaldi antenna radiation structure electricity, vivaldi antenna radiation structure includes the radiation paster that bilateral symmetry set up, the radiation paster includes middle radiation paster and side radiation paster, set up the radiation arm loading groove that the broach form was arranged along length direction equidistance on the side radiation paster, and seted up the gradual change open slot between side radiation paster and the middle radiation paster. The utility model discloses a Vivaldi antenna has advantages such as novel structure, radiation pattern are stable, broadband to this antenna can cover 0.4GHz-8GHz, realizes good radiation directivity.
Description
Technical Field
The utility model belongs to the technical field of the wireless communication technique and specifically relates to a be applied to antenna test system's Vivaldi antenna is related to.
Background
With the rapid development of communication technology, after the antenna is designed by simulation software, it is most important to test the antenna performance of the antenna in an antenna test system by using an antenna object, and the test probe antenna in the antenna test system is particularly important. Therefore, the test probe antenna design in the antenna test system is the most critical.
Currently, antennas applied to an antenna test system are mainly a patch antenna, a monopole antenna, and a Vivaldi antenna. The patch antenna is generally of a multilayer structure, and the feeding mode of the patch antenna is complex; whereas monopole antennas are generally vertical elements.
The most common method in the antenna test system in the prior art is to stagger the monopole Vivaldi antenna according to 0 ° and 90 ° to obtain good data, but this may cause difficulty in obtaining accurate data when testing the ± 90 ° dipole antenna, so it is urgently needed to design a ± 90 ° Vivaldi antenna which can be well applied to the antenna test system.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical defect who proposes in the above-mentioned background art, the utility model provides a be applied to antenna test system's Vivaldi antenna, simple structure and stable antenna structure, this antenna can cover 0.4GHz-8GHz to can realize good radiation directionality.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the Vivaldi antenna comprises a dielectric substrate, wherein the dielectric substrate is arranged in an orthogonal mode, an antenna radiation unit is etched on the dielectric substrate and comprises an upper metal layer, a middle metal layer and a lower metal layer, a Vivaldi antenna radiation structure is formed on the upper metal layer and the lower metal layer, a feed structure is formed on the middle metal layer and is electrically connected with the Vivaldi antenna radiation structure, the dielectric substrate is clamped between the two adjacent metal layers, the Vivaldi antenna radiation structure comprises radiation patches which are symmetrically arranged in a left-right mode, the radiation patches comprise a middle radiation patch and side radiation patches connected to two sides of the middle radiation patch, radiation arm loading grooves which are arranged in a comb-tooth shape are formed in the side radiation patches at equal intervals in the length direction, and an open slot is formed between the side radiation patches and the middle radiation patch.
Preferably, the dielectric substrate is a rogers 4003C dielectric substrate, the radiation circuit is printed by adopting a printed circuit process, and the dielectric substrate is placed in parallel with the XOY surface.
Preferably, the gradually-changing open slot includes a resonant cavity, a first gradually-changing slot extending along the side edge of the side edge radiation patch, and a second gradually-changing slot extending along the side edge of the middle radiation patch, and one end of the first gradually-changing slot and one end of the second gradually-changing slot are both connected with the resonant cavity to form a horn-shaped opening.
Preferably, the length of the first gradually-changing groove is greater than that of the second gradually-changing groove, the resonant cavity is of a circular structure, and the first gradually-changing groove and the second gradually-changing groove are symmetrical with respect to a central axis of the resonant cavity.
Preferably, the feed structure on the middle metal layer comprises a circular open-circuit coupling cavity and a feed microstrip line, a feed balun is arranged between the circular open-circuit coupling cavity and the feed microstrip line, one end of the feed balun is connected with the feed microstrip line, and the other end of the feed balun is connected with the circular open-circuit coupling cavity.
Preferably, the feed microstrip line penetrates through the medium substrate between the middle metal layer and the lower metal layer, and one end of the feed microstrip line, which is close to the inner side of the medium substrate, extends to the radiation patch and is connected with the resonant cavity for coupling excitation.
To sum up, the beneficial effects of the utility model are that:
the utility model discloses be applied to antenna test system's Vivaldi antenna and design radiation arm loading groove structure at radiation paster department to add the method that a more Vivaldi structure was handled with traditional Vivaldi dipole, make radiation arm loading groove structure can restrain the electric current that comes from the higher order mode, thereby reach good radiation effect and have stable radiation pattern; moreover, the influence among the radiation patches is effectively reduced by processing the radiation patches; the Vivaldi antenna can also cover 0.4GHz-8GHz, so that good radiation directivity is realized, and the Vivaldi antenna also has the advantages of novel structure, stable radiation pattern, broadband and the like.
Drawings
Fig. 1 is a schematic diagram of a three-dimensional structure of the Vivaldi antenna of the present invention;
fig. 2 is a cross-sectional view of the Vivaldi antenna of the present invention;
FIG. 3 is a schematic view of the structure of the antenna radiation unit of the present invention;
FIG. 4 is a schematic diagram of an exploded structure of the antenna radiation unit of the present invention;
fig. 5 shows the 3D radiation pattern of the Vivaldi antenna of the present invention at 7 GHz.
The reference numerals in the figures illustrate:
1. a dielectric substrate; 2. an antenna radiation unit; 21. an upper metal layer; 22. a middle metal layer; 23. A lower metal layer; 3. a radiation patch; 31. an intermediate radiation patch; 32. a side radiating patch; 321. A radiation arm loading slot; 33. gradually changing an open slot; 331. a resonant cavity; 332. a first tapered slot; 333. A second taper groove; 4. a feed structure; 41. a circular open-circuit coupling cavity; 42. a feed microstrip line; 43. And feeding the balun.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art all belong to the protection scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present disclosure and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms are not to be construed as limiting the invention.
As shown in fig. 1 to 4, a Vivaldi antenna applied to an antenna test system includes a dielectric substrate 1, the dielectric substrate 1 is disposed orthogonally to each other, an antenna radiation unit 2 is etched on the dielectric substrate 1, the antenna radiation unit 2 includes an upper metal layer 21, a middle metal layer 22 and a lower metal layer 23, a Vivaldi antenna radiation structure is formed on the upper metal layer 21 and the lower metal layer 23, a feed structure 4 is formed on the middle metal layer 22 and electrically connected to the Vivaldi antenna radiation structure, the dielectric substrate 1 is sandwiched between two adjacent metal layers, the Vivaldi antenna radiation structure includes radiation patches 3 disposed symmetrically, the radiation patches 3 include a middle radiation patch 31 and side radiation patches 32 connected to two sides of the middle radiation patch 31, the side radiation patches 32 are provided with radiation arm loading slots 321 arranged in a comb-like arrangement at equal intervals along a length direction, and a gradual open slot 33 is provided between the side radiation patches 32 and the middle radiation patch 31.
In practical application of the Vivaldi antenna, an arc-section broadband action part is mainly formed at the side edge of the convex wing of each radiation patch 3, and the arc-section broadband action part is connected between the resonant cavities 331 in an arc curve shape, so that a broadband dual-polarized dipole antenna oscillator obtains a broadband effect. The radiation patch 3 is a copper sheet adhered on the dielectric substrate 1, and the radiation patch 3 can also be a metal coating on the dielectric substrate 1.
Specifically, the dielectric substrate 1 is arranged orthogonally to each other, and mutual coupling between units is small, so that the dielectric substrate has ultra-wideband and dual-polarization characteristics. In order to meet the requirements of ultra wide band of 0.4GHz-8GHz and miniaturization during designing a vivaldi antenna, a loading method is adopted, and by means of resistance loading (a first loading resistor and a second loading resistor) and loading of a medium with a high dielectric constant, a quasi-semicircular irregular patch (a radiation patch 3) is loaded on a terminal, so that the widening of the antenna bandwidth and the miniaturization of the size are realized at the expense of the antenna gain; the cross-shaped metal structure is adopted, and the structure has the following advantages: firstly, the structure is simple, and the antenna is easy to integrate with an original antenna; the cross-shaped structure is provided with two rectangular radiation patches 3 which are mutually crossed, and the electromagnetic waves in the x and y polarization directions can be modulated by adjusting the lengths of the two rectangular radiation patches 3 respectively; the antenna radiation unit 2 is composed of a + 90-degree polarized dipole radiation oscillator and a-90-degree polarized dipole radiation oscillator, and the + 90-degree polarized dipole radiation oscillator and the-90-degree polarized dipole radiation oscillator are arranged in the radiation direction of electromagnetic waves and can play a role in guiding the electromagnetic waves, so that more electromagnetic waves are radiated to the radiation direction, and the gain of the antenna is further improved.
In this embodiment, the dielectric substrate 1 is a rogers 4003C dielectric substrate 1, a radiation circuit is printed by adopting a printed circuit process, and the dielectric substrate 1 is placed in parallel with an XOY surface.
Specifically, the dielectric substrate 1 is the Rogers 4003C dielectric substrate 1, which is different from the conventional epoxy resin for PCB, and no glass fiber in the Rogers 4003C dielectric substrate 1 is a ceramic-based high-frequency material. When the working frequency of the circuit is above 500MHz, the range of selectable materials is greatly reduced, and the adoption of the Rogers 4003C dielectric substrate 1 material can be more convenient for designing the circuit, such as network matching, impedance control of transmission lines and the like. Because of the characteristic of low dielectric loss, the Rogers 4003C material has the advantage that the common circuit material cannot match in high-frequency application. Compared with similar materials, the material has the lowest fluctuation of the dielectric constant along with the temperature, and the dielectric constant is quite stable in a wide frequency range, so that the material is more suitable for the application field of broadband antennas.
In this embodiment, the gradually-varied open slot 33 includes a resonant cavity 331, a first gradually-varied slot 332 extending along a side of the side radiation patch 32, and a second gradually-varied slot 333 extending along a side of the middle radiation patch 31, and one end of each of the first gradually-varied slot 332 and the second gradually-varied slot 333 is connected to the resonant cavity 331 to form a horn-shaped opening. The length of the first graded slot 332 is greater than that of the second graded slot 333, the resonant cavity 331 is a circular structure, and the first graded slot 332 and the second graded slot 333 are symmetrical with respect to a central axis of the resonant cavity 331.
Specifically, the top end of the resonant cavity 331 is connected to the first tapering groove 332 and the second tapering groove 333, and the first tapering groove 332 and the second tapering groove 333 extend to two top corners of the rear side of the antenna radiating unit 2, respectively, so as to implement a double-open-groove vivaldi structure and reduce the low-end standing wave. The double-slotted vivaldi structure of the vivaldi antenna can generate an electric field similar to a plane wave on the E surface of the antenna, so that the electric field of the antenna on a working frequency band radiation dielectric plate is more uniformly and intensively distributed, an antenna directional diagram is more stable, electric field lines flow along the first gradually-changing slot 332 and the second gradually-changing slot 333 of the radiation sheet to generate stronger radiation, the antenna radiation unit 2 has an ultra-wide working frequency band, the antenna gain is improved, particularly in a high-frequency band, and the adopted double-slotted vivaldi structure can effectively improve low-end standing waves, so that the antenna has a good high-frequency cross polarization level, and has higher isolation and excellent antenna performance. Meanwhile, the radiating arm loading slot 321 enables current to flow in the vicinity of the first tapering slot 332 and the second tapering slot 333, so that energy is radiated better to realize ultra-wideband design of the antenna, and return loss of the antenna at low frequency can be reduced, so that the antenna impedance matching effect is optimal.
In this embodiment, the feeding structure 4 on the middle metal layer 22 includes a circular open-circuit coupling cavity 41 and a feeding microstrip line 42, a feeding balun 43 is disposed between the circular open-circuit coupling cavity 41 and the feeding microstrip line 42, one end of the feeding balun 43 is connected to the feeding microstrip line, and the other end of the feeding balun 43 is connected to the circular open-circuit coupling cavity 41. The feed microstrip line 42 penetrates through the dielectric substrate 1 between the middle metal layer 22 and the lower metal layer 23, and one end of the feed microstrip line 42 close to the inner side of the dielectric substrate 1 extends to the radiation patch 3 and is connected with the resonant cavity 331 for coupling excitation.
Specifically, the feed microstrip line 42 includes an input microstrip line and an output microstrip line, the input microstrip line extends transversely from the left side or right side edge of the upper surface of the dielectric substrate 1 toward the middle of the radiation unit, the inner end of the input microstrip line is connected to the signal line of the coplanar waveguide on the lower surface of the dielectric substrate 1 through a metalized through hole, the lower surface of the dielectric substrate 1 is further provided with a U-shaped ground line of the coplanar waveguide, and the signal line is located in an opening of the U-shaped ground line. An interval is kept between the input end microstrip line and the output end microstrip line, the output end microstrip line is T-shaped, and the output end microstrip line is connected with the two free ends of the U-shaped grounding wire through the metalized through holes.
Referring to the 3D radiation pattern of the Vivaldi antenna at 7GHz, as shown in fig. 5, the maximum gain of the Vivaldi antenna at 7GHz is 10db, and each radiation direction is uniform, thereby having a good radiation effect and a stable radiation pattern.
In the embodiments provided in the present application, it should be understood that the disclosed structures may be implemented in other ways. For example, the structure of the Vivaldi antenna embodiment applied to the antenna test system described above is merely illustrative, and for example, the shape and size of the loading slot 321 of the radiating arm and the distance between the grooves are only one physical structure that can be realized, and in practice, the structure can be designed to other reasonable sizes following the design principle.
The embodiments of the present invention are preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, wherein like parts are denoted by like reference numerals. Therefore: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (6)
1. The Vivaldi antenna applied to the antenna test system comprises a dielectric substrate and is characterized in that the dielectric substrate is arranged in a mutually orthogonal mode, an antenna radiation unit is etched on the dielectric substrate and comprises an upper metal layer, a middle metal layer and a lower metal layer, a Vivaldi antenna radiation structure is formed on the upper metal layer and the lower metal layer, a feed structure is formed on the middle metal layer and is electrically connected with the Vivaldi antenna radiation structure, the dielectric substrate is clamped between the two adjacent metal layers, the Vivaldi antenna radiation structure comprises radiation patches which are symmetrically arranged in a left-right mode, each radiation patch comprises a middle radiation patch and side radiation patches connected to two sides of the middle radiation patch, radiation arm loading grooves which are arranged in a comb-tooth shape are formed in the side radiation patches at equal intervals in the length direction, and a gradual change open slot is formed between each side radiation patch and the middle radiation patch.
2. A Vivaldi antenna for an antenna testing system according to claim 1, characterized in that the dielectric substrate is a rogers 4003C dielectric substrate, the radiating circuit is printed using a printed circuit technology, and the dielectric substrate is placed parallel to the XOY plane.
3. A Vivaldi antenna for use in an antenna testing system according to claim 1, wherein the tapered open slot comprises a resonant cavity, a first tapered slot extending along a side of the side radiating patch, and a second tapered slot extending along a side of the middle radiating patch, one end of each of the first and second tapered slots being connected to the resonant cavity to form a horn-shaped opening.
4. A Vivaldi antenna for an antenna testing system according to claim 3, wherein the first tapering slot has a length greater than that of the second tapering slot, the resonant cavity has a circular configuration, and the first tapering slot and the second tapering slot are symmetrical about a central axis of the resonant cavity.
5. The Vivaldi antenna applied to antenna test system according to claim 4, wherein the feeding structure on the middle metal layer comprises a circular open-circuit coupling cavity and a feeding microstrip line, a feeding balun is disposed between the circular open-circuit coupling cavity and the feeding microstrip line, one end of the feeding balun is connected to the feeding microstrip line, and the other end of the feeding balun is connected to the circular open-circuit coupling cavity.
6. A Vivaldi antenna applied to an antenna test system according to claim 5, wherein the feed microstrip line penetrates through the dielectric substrate between the middle metal layer and the lower metal layer, and one end of the feed microstrip line close to the inner side of the dielectric substrate extends to the radiation patch and is connected with the resonant cavity for coupling excitation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222310572.2U CN218569220U (en) | 2022-08-30 | 2022-08-30 | Vivaldi antenna applied to antenna test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222310572.2U CN218569220U (en) | 2022-08-30 | 2022-08-30 | Vivaldi antenna applied to antenna test system |
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| Publication Number | Publication Date |
|---|---|
| CN218569220U true CN218569220U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222310572.2U Active CN218569220U (en) | 2022-08-30 | 2022-08-30 | Vivaldi antenna applied to antenna test system |
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| CN (1) | CN218569220U (en) |
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2022
- 2022-08-30 CN CN202222310572.2U patent/CN218569220U/en active Active
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