An improved Vivaldi antenna

Abstract

The present invention relates to the technical field of antennas, and discloses an improved Vivaldi antenna. The key points of the technical solution are that it includes two antenna bodies which are orthogonally arranged. Each antenna body includes a substrate, and a radiation patch and a microstrip line feeder are respectively arranged on two side surfaces of the substrate. An opening is formed in the radiation patch, and slits are formed on both sides of the opening. A parasitic stub is further arranged on the side surface of the substrate where the radiation patch is installed. The present invention mainly solves the problem of the main lobe pattern deviation of the dual-polarized Vivaldi antenna by loading the parasitic stub, preventing the main lobe pattern of the E-plane of one of the antennas from deviating, so that the test data has deviation and affects the accuracy and feasibility of the measurement result.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and more particularly to an improved Vivaldi antenna. Background Art

[0002] The Vivaldi antenna is a traveling wave antenna with directional radiation. Compared with antennas of other structures, it has a wide operating frequency band range. In a measurement antenna, there is always an offset in the E-plane main lobe pattern of one of the antennas, which causes deviation in the test data and affects the accuracy and feasibility of the measurement results. Summary of the Invention

[0003] Aiming at the deficiencies existing in the prior art, the purpose of the present invention is to provide an improved Vivaldi antenna to overcome the above-mentioned defects in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An improved Vivaldi antenna includes two antenna bodies which are orthogonally arranged. Each antenna body includes a substrate, and a radiation patch and a microstrip line feeder are respectively arranged on both sides of the substrate. The radiation patch is formed with an opening, and gaps are formed on both sides of the opening. On the side of the substrate where the radiation patch is installed, parasitic stubs are also arranged, and the parasitic stubs are located between the gaps. The parasitic stubs are used to reduce the offset of the antenna main lobe pattern. The present invention mainly solves the problem of the offset of the main lobe pattern of the dual-polarized Vivaldi antenna by loading parasitic stubs, preventing the offset of the E-plane main lobe pattern of one of the antennas, which causes deviation in the test data and affects the accuracy and feasibility of the measurement results.

[0005] As a further improvement of the present invention, the parasitic stub is of an asymmetric structure.

[0006] As a further improvement of the present invention, the parasitic stub includes a first protrusion, a second protrusion and a third protrusion. The second protrusion is arranged on one side of the first protrusion, and the third protrusion is arranged at the bottom of the second protrusion to form an asymmetric structure.

[0007] As a further improvement of the present invention, the gaps are all arranged along the length direction of the substrate. There are two sections of the gaps, which respectively include rectangular slot lines and gradual curves. The rectangular slot lines on both sides are parallel to each other, and the gradual curves extend to one end of the substrate.

[0008] As a further improvement of the present invention, a resonant cavity is formed at one end of the rectangular slot line far from the gradual curve.

[0009] As a further improvement of the present invention, the microstrip line feeder extends along the width direction of the substrate and one end extends to one side of the substrate.

[0010] As a further improvement of the present invention, a fan-shaped structure is provided at one end inside the microstrip line feeder.

[0011] As a further improvement of the present invention, the substrate is provided with at least one fixing leg.

[0012] Beneficial effects of the present invention: The present invention mainly solves the problem of the main lobe pattern deviation of the dual-polarized Vivaldi antenna by loading parasitic stubs, preventing the main lobe pattern of the E-plane of one of the antennas from deviating, resulting in deviation of test data and affecting the accuracy and feasibility of measurement results. Description of the Drawings

[0013] Figure 1 is a schematic three-dimensional structure diagram of the present invention;

[0014] Figure 2 is a schematic front view structure diagram of the present invention;

[0015] Figure 3 is a schematic rear view structure diagram of the present invention;

[0016] Figure 4 is a schematic three-dimensional structure diagram of the dual-polarized antenna formed by the present invention;

[0017] Figure 5 is the pattern result before and after loading parasitic stubs at 3.6 GHz of the present invention;

[0018] Figure 6 is the pattern result before and after loading parasitic stubs at 6 GHz of the present invention.

[0019] Reference numerals: 1, antenna body; 2, substrate; 3, radiation patch; 4, slot; 41, tapered curve; 42, rectangular slot line; 5, parasitic stub; 51, first protrusion; 52, second protrusion; 53, third protrusion; 6, resonant cavity; 7, microstrip line feeder; 8, fixing leg. Detailed Description of the Invention

[0020] The present invention will be further described in detail below with reference to the drawings and embodiments. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0021] Refer to Figure 1As shown in the figure, an improved Vivaldi antenna according to this embodiment includes two antenna bodies 1, and the two antenna bodies 1 are orthogonally arranged. Each antenna body 1 includes a substrate 2. Radiation patches 3 and microstrip line feeders 7 are respectively arranged on both sides of the substrate 2. The radiation patch 3 has an opening, and gaps 4 are formed on both sides of the opening. On the side of the substrate 2 where the radiation patch 3 is installed, parasitic stubs 5 are also arranged, and the parasitic stubs 5 are located between the gaps 4. The parasitic stubs 5 are used to reduce the deviation of the main lobe pattern of the antenna. The present invention mainly solves the problem of the deviation of the main lobe pattern of the dual-polarized Vivaldi antenna by loading the parasitic stubs 5, preventing the deviation of the E-plane main lobe pattern of one of the antennas, which may cause deviation in test data and affect the accuracy and feasibility of the measurement results.

[0022] Specifically, as shown in the attached drawings, each antenna body 1 has a slit at each of its two ends, and it is necessary to ensure that the slit position is at the center of the antenna body 1 and is arranged along its length direction, so as to achieve cross orthogonality and dual polarization through the splicing method.

[0023] In one embodiment, the radiation patch 3 is made of a metal material and is formed on one side of the substrate 2 by etching.

[0024] In one embodiment, the material of the substrate 2 is a PCB material.

[0025] In one embodiment, the parasitic stub 5 has an asymmetric structure, which effectively enables the radiation current of the gap 4 and the current on the parasitic stub 5 to perform field superposition and cancellation, thereby changing the maximum radiation direction. The length and width of the parasitic stub 5 need to be appropriately optimized according to the optimized frequency.

[0026] In one embodiment, the parasitic stub 5 includes a first protrusion 51, a second protrusion 52, and a third protrusion 53. The second protrusion 52 is arranged on one side of the first protrusion 51, and the third protrusion 53 is arranged at the bottom of the second protrusion 52 to form an asymmetric structure.

[0027] Specifically, in this embodiment, energy is coupled to the gap 4 through the microstrip line feeder 7 for feeding, and loading is performed at 3.6 GHz and 6 GHz respectively. As shown in the attached drawings, the change of the improved main lobe pattern can be clearly obtained.

[0028] In one embodiment, the gaps 4 are all arranged along the length direction of the substrate 2. There are two sections of the gaps 4, which respectively include rectangular slot lines 42 and tapered curves 41. The rectangular slot lines 42 on both sides are parallel to each other, and the tapered curves 41 extend to one end of the substrate 2.

[0029] Specifically, asFigure 1 As shown, the rectangular slot line 42 is connected to the tapered curve 41 and extends in one direction, where the shape of the tapered curve 41 is formed by an exponential curve change.

[0030] In one embodiment, the microstrip line feeder 7 extends along the width direction of the substrate 2, and one end extends to one side of the substrate 2.

[0031] In one embodiment, a resonant cavity 6 is formed at one end of the rectangular slot line 42 far from the tapered curve 41, and a fan-shaped structure is arranged at the inner end of the microstrip line feeder 7. The two cooperate with each other, which can not only couple energy into the slot through coupling, but also effectively expand the bandwidth of the antenna.

[0032] Specifically, at least part of the resonant cavity 6 coincides with the fan-shaped structure, and the advantage of such a setting is that the two are easier to couple.

[0033] In one embodiment, the resonant cavity 6 includes, but is not limited to, a circular structure, an elliptical structure, etc., which resonates with the microstrip coupled feeder on the back to play a role in impedance matching of the microstrip line feeder 7.

[0034] In one embodiment, the substrate 2 is provided with at least one fixing leg 8.

[0035] In one embodiment, the substrate 2 is provided with two fixing legs 8, which are respectively located at one end far from the gap 4.

[0036] In one embodiment, the fixing legs 8 are each internally provided with a round hole, and a screw can be installed in the round hole, and the antenna body 1 can be installed at the installation location through the round hole.

[0037] Working principle: The microstrip line feeder 7 couples energy into the gap 4 through coupling, so that the radiation current in the gap 4 and the current on the parasitic stub 5 are superimposed and eliminated in the field, thereby changing the maximum radiation direction.

[0038] The above is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and retouches should also be regarded as the protection scope of the present invention.

Claims

1. An improved Vivaldi antenna, comprising two antenna bodies (1), the two antenna bodies (1) being orthogonally arranged, and each of the antenna bodies (1) comprising a substrate (2), characterized in that: Radiation patches (3) and microstrip line feeders (7) are respectively arranged on both sides of the substrate (2). The radiation patch (3) has an opening, and slots (4) are formed on both sides of the opening. A parasitic stub (5) is also arranged on the side of the substrate (2) where the radiation patch (3) is installed, and the parasitic stub (5) is located between the slots (4). The parasitic stub (5) is used to reduce the offset of the main lobe pattern of the antenna; the parasitic stub (5) is an asymmetric structure; the parasitic stub (5) includes a first protrusion (51), a second protrusion (52) and a third protrusion (53). The second protrusion (52) is arranged on one side of the first protrusion (51), and the third protrusion (53) is arranged at the bottom of the second protrusion (52) to form an asymmetric structure.

2. An improved Vivaldi antenna according to claim 1, characterized in that: The slots (4) are all arranged along the length direction of the substrate (2). There are two sections of the slots (4), which respectively include rectangular slot lines (42) and gradual change curves (41). The rectangular slot lines (42) on both sides are parallel to each other, and the gradual change curves (41) extend to one end of the substrate (2).

3. The improved Vivaldi antenna according to claim 2, wherein: A resonant cavity (6) is formed at one end of the rectangular slot line (42) far from the gradual change curve (41).

4. An improved Vivaldi antenna according to claim 1 or 3, characterized in that: The microstrip line feeder (7) extends along the width direction of the substrate (2), and one end extends to one side of the substrate (2).

5. An improved Vivaldi antenna according to claim 4, characterized in that: A fan-shaped structure is arranged at the inner end of the microstrip line feeder (7).

6. An improved Vivaldi antenna according to claim 1, characterized in that: The substrate (2) is provided with at least one fixing leg (8).

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