Ku-band broadband low-profile antenna

Abstract

The application discloses a Ku-band broadband low-profile antenna, which comprises a dielectric substrate (1) and a radiation layer arranged on the upper surface of the dielectric substrate (1). The radiation layer comprises a metal radiation patch (2), and two primary slots (4) and two secondary slots (5) are arranged in the metal radiation patch (2). The primary slots (4) and the secondary slots (5) are all U-shaped slots. The opening of the first primary slot is directed to the right and the left side of the first primary slot is coincident with the left side of the metal radiation patch (2), and the opening of the second primary slot is directed to the left and the right side of the second primary slot is coincident with the right side of the metal radiation patch (2). The first secondary slot is located in the region surrounded by the first primary slot, and the second secondary slot is located in the region surrounded by the second primary slot. The application can ensure the profile of the antenna and make the antenna have sufficient bandwidth.

Description

Technical Field

[0001] This invention relates to the field of antennas, and in particular to a Ku-band broadband low-profile antenna. Background Technology

[0002] Antenna design specifications focus on gain, bandwidth, and other parameters. The advantages of these specifications are often closely related to the material thickness. The bandwidth of an antenna is positively correlated with its thickness. However, excessively thick antennas are not conducive to further industrial design. Currently, to achieve a 2G bandwidth in the Ku band, the commonly used design thickness is 3 to 5 mm. If the antenna profile thickness is reduced, the bandwidth will also decrease accordingly, making it impossible to ensure sufficient bandwidth while reducing the antenna profile. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a Ku-band broadband low-profile antenna that can ensure the antenna profile while providing sufficient bandwidth.

[0004] The objective of this invention is achieved through the following technical solution: a Ku-band broadband low-profile antenna, comprising a dielectric substrate and a radiating layer disposed on the upper surface of the dielectric substrate;

[0005] The radiation layer includes a metal radiation patch, which has two primary slots and two secondary slots.

[0006] Both the primary and secondary slotting are U-shaped slots;

[0007] The first primary slot has an opening to the right and its left side coincides with the left side of the metal radiating patch; the second primary slot has an opening to the left and its right side coincides with the right side of the metal radiating patch.

[0008] The first secondary slot is located within the area enclosed by the first primary slot, and the second secondary slot is located within the area enclosed by the second primary slot.

[0009] The beneficial effects of the present invention are: the present invention, based on the slotting of the antenna metal radiating patch and the addition of parasitic patches, can ensure that the antenna has sufficient bandwidth while maintaining the antenna profile. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the antenna structure of the present invention;

[0011] Figure 2 A schematic diagram of the slot at the point of strongest current and its reflection coefficient;

[0012] Figure 3 This is a schematic diagram of a patch antenna.

[0013] Figure 4 A schematic diagram of a double U-shaped groove and its reflection coefficient;

[0014] Figure 5 A schematic diagram showing the loading of four parasitic patches and their reflection coefficients;

[0015] Among them, 1-dielectric substrate, 2-metal radiating patch, 3-metal parasitic patch, 4-first slot, 5-second slot, 6-through hole. Detailed Implementation

[0016] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited to the following description.

[0017] like Figure 1 As shown, a Ku-band broadband low-profile antenna includes a dielectric substrate 1 and a radiating layer disposed on the upper surface of the dielectric substrate 1.

[0018] The radiation layer includes a metal radiation patch 2, which has two primary slots 4 and two secondary slots 5.

[0019] Both the primary slotting 4 and the secondary slotting 5 are U-shaped slots;

[0020] The first primary slot has an opening facing right and its left side coincides with the left side of the metal radiating patch 2, while the second primary slot has an opening facing left and its right side coincides with the right side of the metal radiating patch 2.

[0021] The first secondary slot is located within the area enclosed by the first primary slot, and the second secondary slot is located within the area enclosed by the second primary slot.

[0022] In embodiments of this application, the radiating layer further includes four metal parasitic patches 3, two of which are located to the left of the metal radiating patch 2, and the other two to the right. Both the metal radiating patch 2 and the metal parasitic patches 3 are rectangular metal patches. The two primary slots 4 are axially symmetrical about the central axis of the metal radiating patch 2. The two secondary slots 5 are also axially symmetrical about the central axis of the metal radiating patch 2. The first secondary slot opens to the right, and its left side is parallel to the left side of the metal radiating patch 2; the second secondary slot opens to the left, and its right side is parallel to the right side of the metal radiating patch 2. The metal radiating patch 2 also has two through holes 6, one above the first primary slot and the second below the first primary slot; these through holes penetrate the substrate together and can be used for further resonance control, while also providing screw space for subsequent antenna fixing.

[0023] The antenna also includes a coaxial feed point, which is located at the center of any secondary slot for feeding power and utilizes the inductive properties of the coaxial cable to partially offset the capacitive characteristics of the slot.

[0024] In the embodiments of this application, to achieve a 2G bandwidth in the Ku band, the commonly used design thickness is 3 to 5 mm. A typical 1mm thick patch antenna has a bandwidth of less than 1%. Achieving a 2G bandwidth, i.e., a 12.5% ​​broadband patch antenna, while further reducing the thickness, places very high design requirements. RO5880 material, suitable for conformal bending, was selected. Considering its commonly used basic thicknesses of 0.254mm, 0.508mm, and 1.016mm, the thickness was gradually reduced from high to low to explore feasibility.

[0025] Firstly, when introducing a 1.016mm gap, it was found that the double U-shape could simultaneously excite multiple modes without causing degeneracy. By bringing the frequency points closer together and deepening the resonance, a 2GHz bandwidth could be formed. The choice was made to further reduce the thickness to achieve ultra-thinness; here, a detailed description of the 0.508mm antenna design is provided.

[0026] The central idea for 2G bandwidth design is to achieve multiple resonances through slotting. Various design techniques are used to make the resonant points adjacent and deepen the resonance depth, relying on continuous resonant modes to form a broadband signal. A typical 0.508mm patch antenna has a bandwidth of only 0.5GHz. By observing its surface current, slotting is performed at the point of strongest current, and after parameter adjustments and design optimization, the reflection coefficient is as follows... Figure 2 As shown in the diagram. It's easy to see that no new resonant point was formed: because the two resonant modes are too close together, a degenerate mode is formed. Intuitively, the center frequency shifts, and the degenerate mode deepens the resonance depth. For a patch antenna, its schematic diagram is as follows... Figure 3 As shown.

[0027] For patch antenna resonance, the slot can be considered as a parallel resonance equivalent to (G+jB). The slot introducing a new resonance can be viewed as introducing new capacitance and inductance. Low-frequency resonance can be considered as:

[0028]

[0029] like Figure 4 As shown, a secondary truncation process is performed between the gaps to form two adjacent gaps, which can resist degenerate modes and effectively shift the low-frequency points to lower frequencies. The arrows point to the two resonant points.

[0030]

[0031] To counteract the capacitive nature of the slot, the feed point of the coaxial feeding structure can be selected at the center of the secondary slot, which is equivalent to a series inductor, further deepening the resonance and promoting the degeneracy of the modes generated in the first stage. For example... Figure 5 As shown, four parasitic patches can be loaded to enhance resonance. Furthermore, after loading the circular aperture, the main resonator maintains the TM21 mode excited by the previous slot and the main mode TM10, with the modes adjacent to each other, forming a stable 2G broadband antenna.

[0032] The above description represents preferred embodiments of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technical or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A Ku-band broadband low-profile antenna, characterized in that: It includes a dielectric substrate (1) and a radiating layer disposed on the upper surface of the dielectric substrate (1); The radiation layer includes a metal radiation patch (2), which has two primary slots (4) and two secondary slots (5). Wherein, both the primary slotting (4) and the secondary slotting (5) are U-shaped slots; Among them, the opening of the first primary slot is to the right and the left side coincides with the left side of the metal radiation patch (2), and the opening of the second primary slot is to the left and the right side coincides with the right side of the metal radiation patch (2). The first secondary slot is located within the area enclosed by the first primary slot, and the second secondary slot is located within the area enclosed by the second primary slot. The antenna also includes a coaxial feed point, which is located at the center of any one of the secondary slots.

2. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: The radiation layer also includes four metal parasitic patches (3), two of which are located to the left of the metal radiation patch (2) and the other two are located to the right of the metal radiation patch (2).

3. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: Both the metal radiation patch (2) and the metal parasitic patch (3) are rectangular metal patches.

4. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: The two primary slots (4) are axially symmetrical about the central axis of the metal radiation patch (2).

5. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: The two secondary slots (5) are axially symmetrical about the central axis of the metal radiation patch (2).

6. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: The first secondary slot opening faces to the right, and its left side is parallel to the left side of the metal radiation patch (2); the second secondary slot opening faces to the left, and its right side is parallel to the right side of the metal radiation patch (2).

7. The Ku-band broadband low-profile antenna according to claim 1, characterized in that: The metal radiation patch (2) is also provided with two through holes (6), one of which is located above the first primary slot and the second through hole is located below the first primary slot.

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