CN214099914U - Vivaldi antenna unit - Google Patents
Vivaldi antenna unit Download PDFInfo
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- CN214099914U CN214099914U CN202023058439.XU CN202023058439U CN214099914U CN 214099914 U CN214099914 U CN 214099914U CN 202023058439 U CN202023058439 U CN 202023058439U CN 214099914 U CN214099914 U CN 214099914U
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Abstract
The utility model discloses a Vivaldi antenna unit belongs to antenna technical field. The antenna unit consists of radiating plates, coaxial feeders and a forced boundary control cavity, wherein index slot lines are arranged between the radiating plates, the coaxial feeders are used for directly feeding electricity to the radiating plates, and the forced boundary control cavity surrounds the bottom of the radiating plates. The utility model discloses the limited problem of impedance bandwidth when effectively solving conventional Vivaldi antenna large-interval group battle array, and the cross polarization level is lower, feed structure is simple.
Description
Technical Field
The utility model relates to antenna technical field, in particular to Vivaldi antenna unit.
Background
When the gain requirement is determined, the size of the front is also basically determined. The number of channels is therefore reduced only by increasing the array element spacing.
The Vivaldi antenna is a main antenna type adopted by the ultra-wideband active phased array due to the characteristics of wide bandwidth, excellent radiation characteristic, easiness in processing and the like. However, after the antenna forms a large array, due to the combined action of floor reflection and a cavity, multi-mode resonance occurs, so that energy of certain frequency points cannot be radiated, standing waves are rapidly deteriorated, and resonance frequency points are reduced along with the increase of the spacing of array elements. The array element spacing is generally half wavelength corresponding to high frequency when the conventional ultra wide band wide angle array is arranged, and resonance frequency points can not appear in a working frequency band. Along with the increase of the effective distance between array elements, the resonance frequency point is shifted into the working frequency band, so that the high-frequency part cannot be used. In addition, the array element spacing is limited by the wide angle scan, which is still small for low frequencies. The smaller electrical size of the low band element results in poor antenna element efficiency and performance, and the smaller array element spacing also results in strong coupling of the array elements at low frequencies. Therefore, only the concept of tight coupling can be adopted at low frequency to ensure that the whole array achieves excellent broadband performance.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a Vivaldi antenna unit. The antenna unit has simple feed structure and easy processing, and is suitable for being used as an array element of an ultra-wideband large-space array.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a Vivaldi antenna unit comprises a radiation plate and a forced boundary control cavity; the radiation plate is divided into two radiation patches through an exponential type groove line positioned in the middle of the radiation plate; the bottom of the radiation plate is positioned in the forced boundary control cavity; in the forced boundary control cavity, the bottoms of the two radiation patches are respectively connected with an inner conductor and an outer conductor of a coaxial feeder, and a metal conductor is connected between the inner conductor and the outer conductor of the coaxial feeder; the forced boundary control cavity is made of metal materials, the bottom of the forced boundary control cavity is an antenna metal bottom plate, and a gap is formed between the radiation patch and the antenna metal bottom plate.
Furthermore, the forced boundary control cavity is a rectangular cavity.
Further, the radiation plate and one of the wall surfaces of the enforced boundary control chamber are parallel.
Furthermore, the outer wall surface of the forced boundary control cavity is flush with the part of the radiation patch exposed out of the forced boundary control cavity.
Furthermore, the two radiation patches are connected and fixed through a structure fixing printed board.
The utility model adopts the beneficial effect that above-mentioned technical scheme produced lies in:
1. the utility model discloses a force the boundary control chamber, change the boundary condition of conventional Vivaldi battle array matrix, can satisfy different frequency channels to the different demands of coupling through the height in optimal control chamber, guarantee the low frequency performance when shifting out working band with the high frequency resonance point.
2. Compared with the conventional vivaldi antenna, the utility model has the advantages of simple structure and independent performance of the feed transmission part and the radiation part.
3. Further, the utility model discloses an antenna element has good ultra wide band characteristic when being arranged as the unit in the battle array, and standing-wave ratio is less than 1.5 in 3 doubling of frequency or even wider bandwidth, and radiation performance is good, and the gain is higher.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a cross-sectional view of fig. 1.
Fig. 3 is a graph of standing waves in an array according to an embodiment of the present invention.
Fig. 4 is the simulation directional diagram of the 2GHz unit according to the embodiment of the present invention.
Fig. 5 is a 4GHz unit simulation directional diagram according to an embodiment of the present invention.
Fig. 6 is a 6GHz unit simulation directional diagram according to an embodiment of the present invention.
In the figure: 1. the antenna comprises a radiation plate, 2 a forced boundary control cavity, 3 a structure fixing printed board, 4 a coaxial feeder, 5 a metal conductor, 6 and an antenna metal bottom plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
A Vivaldi antenna unit comprises a radiation plate and a forced boundary control cavity; the radiation plate is divided into two radiation patches through an exponential type groove line positioned in the middle of the radiation plate; the bottom of the radiation plate is positioned in the forced boundary control cavity; in the forced boundary control cavity, the bottoms of the two radiation patches are respectively connected with an inner conductor and an outer conductor of a coaxial feeder, and a metal conductor is connected between the inner conductor and the outer conductor of the coaxial feeder; the forced boundary control cavity is made of metal materials, the bottom of the forced boundary control cavity is an antenna metal bottom plate, and a gap is formed between the radiation patch and the metal bottom plate.
Furthermore, the forced boundary control cavity is a rectangular cavity.
Further, the radiation plate and one of the wall surfaces of the enforced boundary control chamber are parallel.
Furthermore, the outer wall surface of the forced boundary control cavity is flush with the part of the radiation patch exposed out of the forced boundary control cavity.
Furthermore, the two radiation patches are connected and fixed through a structure fixing printed board.
The following is a more specific example:
as shown in fig. 1 and fig. 2, according to the antenna working frequency band and the limitation of array scanning on the array element spacing, an appropriate array element size is selected, and is generally 0.7 λhigh～1.2λhighWherein λ ishighThe highest frequency point free space wavelength. By adjusting the height of the radiation patchThe parameters such as curvature, thickness and opening size optimize the impedance matching. The resonance frequency point can be changed by adjusting the distance between the metal bottom plate 6 of the antenna and the bottom of the radiation plate 1 and the height of the forced boundary condition control cavity, and the gain of the antenna unit can be increased by properly increasing the height of the forced boundary control cavity 2. The feeder adopts a 50 omega coaxial feeder 4, and the inner conductor and the outer conductor of the feeder are respectively connected to the two radiating patches. A section of metal conductor 5 is welded between the outer conductor and the inner conductor of the coaxial feeder, and the imaginary part of the impedance of the feeder is adjusted by adjusting the length of the metal conductor, so that the coaxial feeder can be better matched with the antenna.
The whole antenna unit comprises a radiation patch, a forced boundary control cavity, a coaxial feeder, a metal conductor, a structure fixing printed board 3 and a metal bottom board. The working bandwidth of the antenna is 3 frequency multipliers, the size is 57mm multiplied by 216mm, and the array element spacing is 1.14 lambdahigh. The thickness of the radiation patch is 5.5mm, the curvature is 0.04, the distance from the metal bottom plate of the antenna is 16mm, and the height of the mandatory boundary condition control cavity is 96 mm.
Referring to fig. 3 to 6, the present embodiment has a good ultra-wideband characteristic, a standing-wave ratio is less than 1.5 in 3 frequency doubling bandwidths or even wider bandwidths, a good radiation performance, and a high gain.
The utility model discloses the theory of operation:
the modified Vivaldi antenna of this embodiment radiates electromagnetic waves through an exponential-shaped slot line. (when the conventional Vivaldi antenna is arrayed at a large distance, a resonance point is introduced due to high-frequency band coupling, and the low-frequency band needs strong coupling to achieve excellent performance.) therefore, the cavity is controlled by adopting a forced boundary condition, and the boundary condition of the array element is changed to improve the current distribution of the aperture surface of the radiating unit. According to the radiation characteristics of the slot line antenna, the equivalent phase center of high-frequency band radiation is at the lower half part of the slot line, the equivalent phase center of low-frequency band radiation is at the upper half part of the slot line, and the height of the forced boundary control cavity is optimized, so that the strong coupling of the low-frequency band of the radiation unit can be ensured, and the coupling effect of the high-frequency band can be effectively controlled. And then the high-frequency resonance point is shifted out of the working frequency band while the low-frequency performance is ensured. A section of metal is added between the coaxial inner and outer conductors of the feed part, a capacitance effect is introduced, and the matching is adjusted.
Claims (5)
1. A Vivaldi antenna element comprising a radiating plate, characterized by further comprising a mandatory border control cavity; the radiation plate (1) is divided into two radiation patches through an exponential type groove line positioned in the middle of the radiation plate; the bottom of the radiation plate is positioned in the forced boundary control cavity (2); in the forced boundary control cavity, the bottoms of the two radiation patches are respectively connected with an inner conductor and an outer conductor of a coaxial feeder (4), and a metal conductor (5) is connected between the inner conductor and the outer conductor of the coaxial feeder; the forced boundary control cavity is made of metal materials, the bottom of the forced boundary control cavity is an antenna metal bottom plate (6), and a gap is formed between the radiation patch and the antenna metal bottom plate.
2. A Vivaldi antenna element according to claim 1, characterized in that said forced boundary control cavity is a rectangular cavity.
3. A Vivaldi antenna element according to claim 2, characterized in that said radiating plate and one of the walls of the cavity of the confinement control are parallel.
4. A Vivaldi antenna element according to claim 3, characterized in that the outer wall of the cavity is flush with the part of the radiating plate exposed to the cavity.
5. A Vivaldi antenna element according to claim 1, characterized in that said two radiating patches are connected and fixed by means of a structurally fixed printed board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023058439.XU CN214099914U (en) | 2020-12-18 | 2020-12-18 | Vivaldi antenna unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023058439.XU CN214099914U (en) | 2020-12-18 | 2020-12-18 | Vivaldi antenna unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214099914U true CN214099914U (en) | 2021-08-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023058439.XU Active CN214099914U (en) | 2020-12-18 | 2020-12-18 | Vivaldi antenna unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214099914U (en) |
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2020
- 2020-12-18 CN CN202023058439.XU patent/CN214099914U/en active Active
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