An ultra-wideband Vivaldi antenna isolation improvement structure

Abstract

The application belongs to the field of antennas, and discloses an ultra-wideband Vivaldi antenna isolation degree improving structure, which comprises four layers of dielectric plates, four layers of foam plates and a Vivaldi antenna, and comprises dielectric plate 1, foam plate 1, dielectric plate 2, foam plate 2, the Vivaldi antenna, foam plate 3, dielectric plate 3, foam plate 4 and dielectric plate 4 arranged in sequence, wherein the dielectric plate 1 is located in the groove of the foam plate 1, the dielectric plate 2 is located in the groove of the foam plate 2, the dielectric plate 3 is located in the groove of the foam plate 3, and the dielectric plate 4 is located in the groove of the foam plate 4; the dielectric plates and the foam plates are all bonded by adhesive film. The Vivaldi antenna is a main radiation structure, the dielectric plates and the foam plates are isolation degree enhancing structures, the dielectric plates and the foam plates are bonded by adhesive film, and the Vivaldi antenna is located in the interlayer formed by the foam plates and the dielectric plates. The application can improve the isolation degree of the Vivaldi antenna in the ultra-wideband range, and has a wide application prospect in the field of ultra-wideband microwave imaging and the like.

Description

Technical Field

[0001] This invention belongs to the field of antennas, specifically a structure for improving the isolation of an ultra-wideband Vivaldi antenna. Background Technology

[0002] Simultaneous transmit / receive antennas, enabling simultaneous operation on the same frequency, have garnered significant attention in radar, communications, and other fields. Currently, a critical challenge for simultaneous transmit / receive antennas is improving the isolation between them. Current measures to improve antenna isolation primarily include increasing the distance between the transmit and receive antennas, adding metal insulating barriers or absorbing materials between them, and covering the path between the antennas with electromagnetic metamaterials such as EBG. While these methods provide excellent isolation for narrowband antennas, their effectiveness is limited for broadband antennas.

[0003] The Vivaldi antenna is a typical broadband antenna. Due to its excellent performance such as broadband, stable radiation, and end-fire capability, it is widely used in radar and other applications. To improve the isolation of the Vivaldi antenna, multiple isolation measures are used in combination, which will greatly increase the system size and dimensions. Moreover, as the bandwidth of the Vivaldi antenna increases further, the effectiveness of the above-mentioned combined methods will decrease. Summary of the Invention

[0004] The purpose of this invention is to propose an ultra-wideband Vivaldi antenna isolation enhancement structure to improve the isolation of Vivaldi antennas in the ultra-wideband range.

[0005] The technical solution to achieve the purpose of this invention is as follows: An ultra-wideband Vivaldi antenna isolation improvement structure includes a dielectric plate 1, a foam plate 1, a dielectric plate 2, a foam plate 2, a Vivaldi antenna, a foam plate 3, a dielectric plate 3, a foam plate 4, and a dielectric plate 4 arranged sequentially. The dielectric plate 1 is located in the groove of the foam plate 1, the dielectric plate 2 is located in the groove of the foam plate 2, the dielectric plate 3 is located in the groove of the foam plate 3, and the dielectric plate 4 is located in the groove of the foam plate 4. The dielectric plate and the foam plate, as well as the foam plate and the Vivaldi antenna, are bonded together by adhesive film.

[0006] Furthermore, the dielectric substrates 1, 2, 3, and 4 are all the same size, with the same length as the slotted radiating cavity of the Vivaldi antenna, the same width as the slotted radiating cavity of the Vivaldi antenna, and the same thickness as the substrate of the Vivaldi antenna.

[0007] Furthermore, the dielectric substrates 1, 2, 3, and 4 are made of the same material as the Vivaldi antenna printed circuit board.

[0008] Furthermore, the thickness of the foam board is 0.5λ. h , where λ h This is the wavelength corresponding to the highest operating frequency of the antenna.

[0009] Furthermore, the Vivaldi antenna is a microstrip coplanar Vivaldi antenna, a stripline biplanar Vivaldi antenna, or a microstrip heel-to-heel Vivaldi antenna.

[0010] This invention can improve the isolation of Vivaldi antennas in the ultra-wideband range without requiring additional isolation measures between antennas. It can be widely used in related technical fields such as 5G antennas, 6G antennas, massive MIMO antennas, broadband antennas, and satellite antennas. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of an ultra-wideband Vivaldi antenna isolation improvement structure according to the present invention; Figure 2 This is an exploded view of an ultra-wideband Vivaldi antenna isolation enhancement structure according to the present invention. Figure 3 This is a schematic diagram of a Vivaldi antenna with an improved isolation structure for ultra-wideband Vivaldi antennas according to the present invention. Figure 4 This is a schematic diagram of a dielectric substrate and foam board composite structure for improving the isolation of an ultra-wideband Vivaldi antenna according to the present invention. Figure 5 This is a schematic diagram of an embodiment of the ultra-wideband Vivaldi antenna isolation improvement structure of the present invention; Figure 6 This is a simulation isolation diagram of an embodiment of the ultra-wideband Vivaldi antenna isolation enhancement structure of the present invention. Detailed Implementation

[0012] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the following references are made to the appendix. Figure 1-6 The present invention will be further described in detail with reference to specific embodiments.

[0013] This invention provides an ultra-wideband Vivaldi antenna isolation improvement structure, comprising, from top to bottom, a dielectric substrate 1, a foam board 1, a dielectric substrate 2, a foam board 2, a Vivaldi antenna, a foam board 3, a dielectric substrate 3, a foam board 4, and a dielectric substrate 4. The dielectric substrate 1 is located in a groove in the foam board 1, the dielectric substrate 2 is located in a groove in the foam board 2, the dielectric substrate 3 is located in a groove in the foam board 3, and the dielectric substrate 4 is located in a groove in the foam board 4. The dielectric substrates and foam boards, as well as the foam board and Vivaldi antenna, are bonded together using adhesive film.

[0014] Dielectric substrate 1, dielectric substrate 2, dielectric substrate 3 and dielectric substrate 4 are the same size, with the length being the same as the length of the slotted radiating cavity of the Vivaldi antenna, the width being the same as the width of the slotted radiating cavity of the Vivaldi antenna, and the thickness being the same as the thickness of the Vivaldi antenna substrate.

[0015] Dielectric board 1, dielectric board 2, dielectric board 3 and dielectric board 4 are made of the same material as the Vivaldi antenna printed circuit board.

[0016] The thickness of the foam board is approximately half the wavelength corresponding to the high-end operating frequency, that is, the thickness of the foam board is 0.5λ. h , where λ h This is the wavelength corresponding to the highest operating frequency of the antenna.

[0017] Vivaldi antennas include microstrip coplanar Vivaldi antennas, stripline biplanar Vivaldi antennas, and microstrip heel-to-heel Vivaldi antennas.

[0018] Example: like Figure 1 and 2 As shown, an ultra-wideband Vivaldi antenna isolation enhancement structure includes a dielectric substrate 1, a foam board 1, a dielectric substrate 2, a foam board 2, a Vivaldi antenna, a foam board 3, a dielectric substrate 3, a foam board 4, and a dielectric substrate 4.

[0019] The Vivaldi antenna takes the form of a conventional microstrip heel-type Vivaldi antenna, such as... Figure 3 As shown, the antenna dimensions are 40mm × 60mm × 0.508mm, the dielectric constant of the antenna substrate is 3.55, the width of the antenna radiating slot is 20mm, and the length is 40mm. The curvature of the radiating slot curve is 0.1.

[0020] Dielectric board 1, dielectric board 2, dielectric board 3, and dielectric board 4 all have a thickness of 0.508 mm, a dielectric constant of 3.55, a width of 20 mm, and a length of 40 mm. The foam board has a thickness of 3.25 mm.

[0021] like Figure 4 As shown, the medium board is adhered to the groove of the foam board using adhesive film.

[0022] like Figure 5 As shown, in this embodiment, the two antennas in the antenna transceiver system are 10mm apart. The simulation results of the isolation between the two antennas are as follows. Figure 6 As shown, the simulated isolation of a conventional heel-to-heel Vivaldi antenna at the same spacing is also... Figure 6As can be seen from the figure, the isolation across the entire frequency band of 2.5-50GHz in this embodiment is significantly improved, with an average improvement of 6.4dB compared to a conventional heel-to-heel Vivaldi antenna.

[0023] The embodiment described in this invention is proposed merely as an implementation of an ultra-wideband Vivaldi antenna isolation enhancement structure, and the related description is illustrative rather than limiting. Therefore, those skilled in the art can make other specific implementations based on the design ideas in the appended claims, and various changes in form and detail can be made without departing from the spirit and scope of the invention as defined in the appended claims, without any inventive effort. All of these should be considered within the scope of this invention.

Claims

1. A structure for improving the isolation of an ultra-wideband Vivaldi antenna, characterized in that, The device comprises, in sequence, dielectric board 1, foam board 1, dielectric board 2, foam board 2, Vivaldi antenna, foam board 3, dielectric board 3, foam board 4, and dielectric board 4. Dielectric board 1 is located in a groove in foam board 1, forming a first composite unit; dielectric board 2 is located in a groove in foam board 2, forming a second composite unit; dielectric board 3 is located in a groove in foam board 3, forming a third composite unit; and dielectric board 4 is located in a groove in foam board 4, forming a fourth composite unit. The first and second composite units form a double-layer attenuation sandwich layer on one side of the Vivaldi antenna, and the third and fourth composite units form a double-layer attenuation sandwich layer on the other side of the Vivaldi antenna. The number of layers, thickness, and dielectric arrangement of the double-layer attenuation sandwich layers on both sides of the Vivaldi antenna are mirror symmetrical. The dielectric board and foam board, as well as the foam board and Vivaldi antenna, are bonded together by adhesive film.

2. The ultra-wideband Vivaldi antenna isolation enhancement structure according to claim 1, characterized in that, The dielectric substrates 1, 2, 3, and 4 are all the same size, with the same length, width, and thickness as the Vivaldi antenna slotted radiating cavity.

3. The ultra-wideband Vivaldi antenna isolation enhancement structure according to claim 1, characterized in that, The dielectric substrates 1, 2, 3, and 4 are made of the same material as the Vivaldi antenna printed circuit board.

4. The ultra-wideband Vivaldi antenna isolation improvement structure according to claim 1, characterized in that, The thickness of the foam board is 0.5λ. h , where λ h This is the wavelength corresponding to the highest operating frequency of the antenna.

5. The ultra-wideband Vivaldi antenna isolation enhancement structure according to claim 1, characterized in that, The Vivaldi antenna is a microstrip coplanar Vivaldi antenna, a stripline biplanar Vivaldi antenna, or a microstrip heel-to-heel Vivaldi antenna.

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