Dual-polarized dipole antenna of ultra-wideband cylindrical conformal array

Abstract

The invention relates to the technical field of phased-array antennas, and particularly discloses an ultra-wideband cylindrical conformal array dual-polarized dipole antenna, which comprises a metal ground layer, a resistive layer, a dielectric substrate, support structures respectively arranged between the metal ground layer and the resistive layer and between the resistive layer and the dielectric substrate, and a radiation structure arranged on the dielectric substrate, the metal ground layer, the resistance layer, the dielectric substrate and the supporting structure are matched with one another to form a curved surface array conformal shape with the section being a curved surface, and the curvature radius of the dielectric substrate is 0.1 lambda to 2 lambda. According to the invention, curved surface conformal can be effectively realized, strong capacitive coupling is introduced according to a tight coupling array theory, the bandwidth of the antenna is expanded, and a resistive layer is introduced between the antenna and the metal floor to absorb short-circuit resonance points of the antenna, so that the bandwidth of the antenna is expanded to a 10: 1 frequency multiplication ratio; the antenna has the advantages of ultra-large bandwidth and dual polarization, and has a good application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of phased array antennas, and more particularly to an ultra-wideband cylindrical conformal array dual-polarized dipole antenna. Background Art

[0002] Although the existing planar ultra-wideband antenna technology can achieve a 10-fold frequency range, when applied to large curvature conformal array design, it cannot achieve broadband operation due to impedance mismatch caused by structural mismatch;

[0003] At the same time, when applied to large curvature conformal array design, the structure cannot support the realization of large curvature physical structure; in order to achieve the conformality of ultra-wideband dual-polarization phased array antenna and curved carrier, it is necessary to design corresponding dual-polarization conformal radiator. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an ultra-wideband cylindrical conformal array dual-polarized dipole antenna, which has the advantages of ultra-large bandwidth and dual polarization;

[0005] The solution adopted by the present invention to solve the technical problem is:

[0006] An ultra-wideband cylindrical conformal array dual-polarized dipole antenna comprises a metal stratum, a resistor layer, a dielectric substrate, a supporting structure respectively arranged between the metal stratum and the resistor layer and between the resistor layer and the dielectric substrate, and a radiation structure arranged on the dielectric substrate;

[0007] The metal stratum, the resistor layer, the dielectric substrate and the support structure cooperate with each other to form a conformal curved array having a curved cross-section, and the curvature radius of the dielectric substrate is 0.1λ-2λ.

[0008] In some possible implementations, the dielectric substrate has a thickness of 0.5 mm-2.2 mm.

[0009] In some possible implementations, the radiation structure includes a plurality of groups of dual-polarization antenna units disposed on the top surface and the bottom surface of the dielectric substrate, and the plurality of groups of dual-polarization antenna units are arranged periodically.

[0010] In some possible implementations, the dual-polarized antenna unit includes a plurality of groups of polarized antenna units 1 disposed on the top surface of the dielectric substrate, and a plurality of groups of polarized antenna units 2 disposed on the bottom surface of the dielectric substrate and orthogonally disposed to the polarized antenna unit 1;

[0011] A gap is formed between two adjacent groups of polarized antenna units 1 and between two adjacent groups of polarized antenna units 2 respectively;

[0012] Two adjacent groups of polarized antenna units 1 form a gap and are arranged correspondingly to a group of polarized antenna units 2, and two adjacent groups of polarized antenna units 2 form a gap and are arranged correspondingly to a group of polarized antenna units 1.

[0013] In some possible implementations, the polarized antenna unit 1 and the polarized antenna unit 2 are butterfly-shaped dipole antenna units.

[0014] In some possible implementations, the relative dielectric constant of the dielectric substrate is 1.05-5.

[0015] In some possible implementations, the sheet resistance of the resistance layer is 50-400Ω / Sq.

[0016] In some possible implementations, the resistance layer is made of PCB resistance material or ITO conductive film.

[0017] In some possible implementations, an array period of the dual-polarization antenna units is 15 mm to 75 mm.

[0018] In some possible implementations, the support structure has a thickness of 1 mm and a relative dielectric constant of 3.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention can effectively achieve surface conformality. According to the tightly coupled array theory, strong capacitive coupling is introduced to expand the bandwidth of the antenna, and a resistance layer is introduced between the antenna and the metal floor to absorb the short-circuit resonance point of the antenna, thereby expanding the bandwidth of the antenna to a 10:1 frequency multiplication ratio.

[0021] The present invention can effectively absorb the short-circuit resonance point that appears in the high-frequency band by setting the resistance layer. When the height of the radiation structure from the metal floor is half a wavelength, the electromagnetic waves reflected by the metal floor and the electromagnetic waves radiated by the antenna itself cancel each other out, resulting in a short circuit; the metal floor can absorb the electromagnetic waves reflected by the metal floor and eliminate the short-circuit resonance.

[0022] The gaps formed between adjacent polarized antenna units 1 and adjacent polarized antenna units 2 are used to form strong capacitive coupling between adjacent units to further expand the bandwidth;

[0023] The present invention can achieve a ten-fold frequency bandwidth, a conformal surface radius of 0.1λ-2λ, has the advantages of ultra-large bandwidth and dual polarization, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 is a side view of the present invention;

[0026] Figure 3 A top view of the present invention;

[0027] Figure 4 It is a simulated standing wave ratio curve diagram of the normal direction and the E surface in Example 1 of the present invention;

[0028] Figure 5 for Figure 4 It is a simulated standing wave ratio curve diagram of the normal direction and the H surface in Example 1 of the present invention;

[0029] in:

[0030] 1. Metallic strata;

[0031] 2. Resistance layer;

[0032] 3. Support structure;

[0033] 4. Dielectric substrate;

[0034] 5. Polarized antenna unit 1;

[0035] 6. Polarized antenna unit 2;

[0036] 7. Feeding port;

[0037] 8. Gap. DETAILED DESCRIPTION

[0038] In the present invention, 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 body; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. The "first", "second" and similar words mentioned in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "one" and other similar words do not indicate a quantity restriction, but indicate the existence of at least one. In the implementation of this application, "and / or" describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In the description of the embodiments of the present application, unless otherwise specified, the meaning of "multiple" refers to two or more. For example, multiple positioning columns refer to two or more positioning columns. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] The present invention is described in detail below.

[0040] like Figure 1-Figure 5 As shown:

[0041] A dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array, comprising a metal layer 1, a resistor layer 2, a dielectric substrate 4, a support structure 3 respectively arranged between the metal layer 1 and the resistor layer 2 and between the resistor layer 2 and the dielectric substrate 4, and a radiation structure arranged on the dielectric substrate 4;

[0042] The metal layer 1, the resistor layer 2, the dielectric substrate 4 and the support structure 3 cooperate with each other to form a curved array conformal with a curved cross-section, and the curvature radius of the dielectric substrate 4 is 0.1λ-2λ.

[0043] Specifically, the cross-sections of the metal layer 1, the resistor layer 2, and the dielectric substrate 4 are arc-shaped; they are supported and fixed by the support structure 3 to form a curved array conformal with a curved cross-section; the metal layer 1, the resistor layer 2, and the dielectric substrate 4 are coaxially arranged, and a gap is formed between two adjacent layers of the structure; the support structure 3 passes through the gap to play a role of fixed support;

[0044] The support structure 3 is made of a material with a low dielectric constant, such as PMI or foam;

[0045] The function of the resistor layer 2 is to absorb the short-circuit resonance point that appears in the high-frequency band. When the height of the dual-polarized antenna unit from the metal floor is half a wavelength, the electromagnetic waves reflected by the metal floor and the electromagnetic waves radiated by the dual-polarized antenna unit itself cancel each other out, resulting in a short circuit. The metal floor can absorb the electromagnetic waves reflected by the metal floor and eliminate the short-circuit resonance.

[0046] In some possible implementations, the dielectric substrate 4 has a thickness of 0.5 mm-2.2 mm.

[0047] In some possible implementations, the radiation structure includes a plurality of groups of dual-polarization antenna units printed on the top and bottom surfaces of the dielectric substrate 4, and the plurality of groups of dual-polarization antenna units are arranged periodically;

[0048] The dual-polarized antenna unit includes a plurality of groups of polarized antenna units 1 5 arranged on the top surface of the dielectric substrate 4, and a plurality of groups of polarized antenna units 2 6 arranged on the bottom surface of the dielectric substrate 4 and arranged orthogonally to the polarized antenna units 1 5;

[0049] A gap 8 is formed between two adjacent groups of polarized antenna units 1 5 and between two adjacent groups of polarized antenna units 2 6;

[0050] Two adjacent groups of polarized antenna units 1 5 form a gap 8 and are arranged correspondingly with a group of polarized antenna units 2 6; two adjacent groups of polarized antenna units 2 6 form a gap 8 and are arranged correspondingly with a group of polarized antenna units 1 5; the gap 8 formed by adjacent polarized antenna units 1 5 or polarized antenna units 2 6 is used to form a strong capacitive coupling of adjacent dual-polarized antenna units on the same side;

[0051] Specifically, the polarized antenna unit 2 6 is respectively arranged on the side (bottom surface) of the dielectric substrate 4 close to the resistance layer 2, and the polarized antenna unit 1 5 is arranged on the side (top surface) of the dielectric substrate 4 away from the resistance layer 2. In this way, the polarized antenna unit 1 5 or the polarized antenna unit 2 6 corresponding to the gap 8 will act as a coupling metal sheet to enhance the capacitive coupling between adjacent polarized antenna units 1 5 or polarized antenna units 2 6, thereby further expanding the bandwidth.

[0052] The polarized antenna unit 1 5 and the polarized antenna unit 2 6 are butterfly-shaped dipole antenna units;

[0053] Specifically, the width of the butterfly-shaped dipole antenna unit is relatively narrow at the feeding port 7, and the width gradually increases from the feeding port 7 to the outside;

[0054] In some possible implementations, the relative dielectric constant of the dielectric substrate 4 is 1.05 to 5. In some possible implementations, the resistor layer 2 is set based on the square resistance value, and the square resistance of the resistor layer 2 is 50 to 400Ω / Sq.

[0055] In some possible implementations, the resistance layer 2 is made of a material that realizes a resistance function, such as a PCB resistance material or an ITO conductive film.

[0056] In some possible implementations, an array period of the dual-polarization antenna units is 15 mm to 75 mm.

[0057] In some possible implementations, the support structure 3 has a thickness of 1 mm and a relative dielectric constant of 3.

[0058] The present invention will effectively realize the conformal property of the curved surface. According to the tightly coupled array theory, strong capacitive coupling is introduced between adjacent dual-polarized antenna units to expand the bandwidth of the antenna. A resistive layer 2 is introduced between the dielectric substrate 4 and the metal floor to absorb the short-circuit resonance point of the antenna, thereby expanding the bandwidth of the antenna to a 10:1 frequency multiplication ratio.

[0059] The present invention has the advantages of ultra-large bandwidth and dual polarization and has good application prospects.

[0060] Embodiment 1:

[0061] This embodiment provides a dual-polarized dipole antenna for an ultra-wideband cylindrical conformal array, comprising a metal layer 1, a resistor layer 2, a support structure 3, a dielectric substrate 4, and a dual-polarized antenna unit;

[0062] Reference Figure 2In this embodiment, the support structure 3 adopts a PCB substrate with a thickness of 1 mm and a relative dielectric constant of 3; the polarized antenna unit 1 5 and the polarized antenna unit 2 6 are arranged orthogonally, the polarized antenna unit 1 5 is located on the top surface of the dielectric substrate 4, and the polarized antenna unit 2 6 is a dual-polarized antenna unit that forms a periodic arrangement with the bottom surface of the dielectric substrate 4;

[0063] The gap 8 between two adjacent groups of polarized antenna units 1 5 and between two adjacent groups of polarized antenna units 2 6 is 0.75 mm;

[0064] The relative dielectric constant of the dielectric substrate is 3.55 and the thickness is 2.024 mm;

[0065] The resistance layer adopts a square resistance of 50Ω / Sq, and can be processed using PCB resistance material or ITO conductive film.

[0066] The polarized antenna unit 1 5 and the polarized antenna unit 2 6 have the same structure and are both butterfly-shaped dipole antenna units with an overall size of 31 mm×31 mm;

[0067] The dual-polarized dipole antenna designed under the above parameters is simulated, and the simulation results are as follows: Figure 4 , Figure 5 As shown by Figure 4 , Figure 5 The simulated standing wave ratio curve of the dual-polarized dipole antenna shows that:

[0068] The dual-polarized dipole antenna for ultra-wideband cylindrical conformal array proposed by the present invention is easy to conform and can realize ±60° scanning of the E plane and the H plane within a ten-fold frequency bandwidth.

[0069] The present invention is not limited to the aforementioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. An ultra-wideband cylindrical conformal array dual-polarized dipole antenna, characterized in that: It includes a metal stratum, a resistor layer, a dielectric substrate, a supporting structure respectively arranged between the metal stratum and the resistor layer and between the resistor layer and the dielectric substrate, and a radiation structure arranged on the dielectric substrate; The metal stratum, the resistor layer, the dielectric substrate and the support structure cooperate with each other to form a conformal curved array having a curved cross-section, and the curvature radius of the dielectric substrate is 0.1λ-2λ.

2. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 1, characterized in that: The thickness of the dielectric substrate is 0.5 mm-2.2 mm.

3. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 1, characterized in that: The radiation structure comprises a plurality of groups of dual-polarization antenna units arranged on the top surface and the bottom surface of the dielectric substrate, and the plurality of groups of dual-polarization antenna units are arranged in a periodic manner.

4. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 3, characterized in that: The dual-polarized antenna unit includes a plurality of groups of polarized antenna units 1 arranged on the top surface of the dielectric substrate, and a plurality of groups of polarized antenna units 2 arranged on the bottom surface of the dielectric substrate and arranged orthogonally to the polarized antenna units 1; A gap is formed between two adjacent groups of polarized antenna units 1 and between two adjacent groups of polarized antenna units 2 respectively; Two adjacent groups of polarized antenna units 1 form a gap and are arranged correspondingly to a group of polarized antenna units 2, and two adjacent groups of polarized antenna units 2 form a gap and are arranged correspondingly to a group of polarized antenna units 1.

5. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 4, characterized in that: The polarized antenna unit 1 and the polarized antenna unit 2 are butterfly-shaped dipole antenna units.

6. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 1, characterized in that: The relative dielectric constant of the dielectric substrate is 1.05-5.

7. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 1, characterized in that: The sheet resistance of the resistance layer is 50-400Ω / Sq.

8. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 7, characterized in that: The resistance layer is made of PCB resistance material or ITO conductive film.

9. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to claim 3, characterized in that: The array period of the dual-polarization antenna units is 15 mm to 75 mm.

10. The dual-polarized dipole antenna of an ultra-wideband cylindrical conformal array according to any one of claims 1 to 9, characterized in that: The support structure has a thickness of 1 mm and a relative dielectric constant of 3.

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