A dual-band antenna based on hybrid radiation patterns

Abstract

The embodiment of the application provides a kind of dual-frequency antenna based on hybrid radiation mode, it includes butterfly electric dipole unit, ground plate, dielectric substrate and feed part;Wherein, the butterfly electric dipole unit and ground plate are all set to the upper surface of dielectric substrate, the feed part is set to the lower surface of dielectric substrate;The butterfly electric dipole unit and ground plate are jointly provided with opening gap, and the opening gap is equivalent to magnetic dipole;The butterfly electric dipole unit includes two dipole arms and two connecting pieces, and the two dipole arms are connected to ground plate by two connecting pieces respectively;Two dipole arms are located at the two sides of opening gap respectively, and two connecting pieces are also located at the two sides of opening gap respectively.The dual-frequency antenna of the application realizes the function of low frequency omnidirectional radiation and high frequency directional radiation using planar structure, has good antenna performance, and the processing cost is low;And realize the wideband dual-frequency antenna performance and simplify the structure of antenna.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, and more specifically, to a dual-band antenna based on a hybrid radiation mode. Background Technology

[0002] With the rapid development of modern wireless communication systems, dual-band antennas have broad application prospects in radar systems, personal mobile systems, and base stations. Several common methods for increasing the operating frequency band of dual-band antennas include: etching slots into radiating patches or ground planes; adding stubs to slot antennas to introduce resonant points; introducing stopband structures within the antenna's operating frequency band; and combining antenna elements operating in different frequency bands. However, most of these methods are based on microstrip antennas and slot antennas, resulting in relatively narrow operating bandwidths. To achieve a wider bandwidth for dual-band antennas, a design using a broadband magnetoelectric dipole antenna is considered.

[0003] Traditional magnetoelectric dipole antennas are mostly complex three-dimensional structures, and the corresponding dual-frequency magnetoelectric dipole antennas are also three-dimensional structures. This relatively complex structure limits the application of such antennas in some practical scenarios. Summary of the Invention

[0004] This invention proposes a dual-band antenna based on a hybrid radiation mode, which solves the technical problem of how to achieve omnidirectional radiation in the low-frequency band and directional radiation in the high-frequency band using a planar structure, thereby realizing the performance of a wide-band dual-band antenna and simplifying the antenna structure.

[0005] The present invention proposes a dual-band antenna based on a hybrid radiation mode, which includes a butterfly electric dipole element, a ground plane, a dielectric substrate, and a feed section. The butterfly electric dipole unit and the ground plane are both disposed on the upper surface of the dielectric substrate, and the power supply part is disposed on the lower surface of the dielectric substrate. The butterfly electric dipole unit and the ground plane together have an opening gap, which is equivalent to a magnetic dipole. The butterfly electric dipole unit includes two dipole arms and two connectors. The two dipole arms are respectively connected to the ground plane through the two connectors. The two dipole arms are respectively located on both sides of the opening gap, and the two connectors are also respectively located on both sides of the opening gap.

[0006] Preferably, the two dipole arms, the two connectors, and the ground plane are all located in the same plane.

[0007] Preferably, each dipole arm is a fan-shaped conductive sheet, the two connectors are parallel to each other and are both rectangular; the ground plane is rectangular in shape, the dielectric substrate is rectangular in shape, and the opening slot is rectangular in shape.

[0008] Preferably, the two dipole arms are symmetrically arranged with respect to the opening gap, and the two connectors are also symmetrically arranged with respect to the opening gap; the two dipole arms, the two connectors, and the ground plane are integrally formed.

[0009] Preferably, both dipole arms are arranged perpendicular to each other with respect to the opening gap.

[0010] Preferably, the power supply section is a power supply balun structure, which includes a first conductive section, a second conductive section and a third conductive section. The first conductive section and the third conductive section are parallel, and the two ends of the second conductive section are respectively perpendicularly electrically connected to one end of the first conductive section and one end of the third conductive section.

[0011] Preferably, the first conductive part and the third conductive part are both rectangular in shape, the second conductive part is trapezoidal in shape, and the length of the first conductive part is greater than the length of the third conductive part; the opening gap is rectangular in shape; the first conductive part and the third conductive part are both parallel to the opening gap; and the position of the feeding balun structure partially corresponds to the position of the opening gap.

[0012] Preferably, the dual-frequency antenna is used to achieve omnidirectional radiation at low frequencies and directional radiation at high frequencies.

[0013] Preferably, the dual-frequency antenna operates in a half-wavelength mode of an electric dipole at low frequencies to achieve omnidirectional radiation. The dual-frequency antenna operates in a high-frequency mode by superimposing an electric dipole of full wavelength mode with an equivalent magnetic dipole of the opening slit to form a magnetoelectric dipole, thereby achieving directional radiation.

[0014] Preferably, the low frequency is 1.65~1.85GHz and the high frequency is 3.05~3.45GHz.

[0015] The beneficial effects of this invention are as follows: The dual-band antenna of this invention employs a planar structure to achieve omnidirectional radiation in the low-frequency band and directional radiation in the high-frequency band, exhibiting excellent antenna performance and low manufacturing cost. This design allows the antenna to achieve dual-band operation with a hybrid radiation mode using a simple planar structure. The antenna of this invention achieves both wide-band dual-band antenna performance and simplifies the antenna structure, giving it greater application potential. Furthermore, the planar structure facilitates antenna installation and makes it suitable for more scenarios; for example, low frequencies can be used to ensure stable connections of devices over a wide range, while high frequencies are used in scenarios requiring high-speed data transmission. Specifically, the antenna of this invention achieves omnidirectional radiation in the low-frequency band by utilizing the half-wavelength mode of an electric dipole; and in the high-frequency band, it achieves omnidirectional radiation by superimposing the full-wavelength mode of an electric dipole with an equivalent magnetic dipole through an opening gap to form a magnetoelectric dipole. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of a dual-band antenna structure according to an embodiment of the present invention.

[0018] Figure 2 This is a rear perspective view of a dual-band antenna structure according to an embodiment of the present invention.

[0019] Figure 3 This is a side view of a dual-band antenna structure according to an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the test results of the reflection performance S11 of the dual-frequency antenna described in this embodiment of the invention.

[0021] Figure 5 This is the low-frequency radiation pattern of the dual-frequency antenna described in this embodiment of the invention.

[0022] Figure 6 This is the high-frequency radiation pattern of the dual-frequency antenna described in this embodiment of the invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0024] With the rapid development of modern wireless communication systems, a dual-band antenna with both omnidirectional and directional radiation patterns has broad application prospects in radar systems, personal mobile systems, and base stations. When an antenna achieves directional radiation, a good front-to-back ratio and wide beamwidth are often crucial requirements. To achieve these performance characteristics, using a complementary method with a magnetoelectric dipole antenna to achieve directional radiation is a feasible approach. Magnetoelectric dipole antennas can form directional radiation patterns and possess advantages such as wide bandwidth, high gain, and small back lobe. Meanwhile, the electric dipole structure within a magnetoelectric dipole antenna can achieve an omnidirectional radiation pattern when operating alone.

[0025] Based on the above research, this invention proposes a dual-frequency planar magnetoelectric dipole dual-frequency antenna 100 with omnidirectional and directional radiation modes (i.e., a dual-frequency antenna 100 with omnidirectional and directional radiation patterns is designed using a magnetoelectric dipole antenna). This achieves wide-band dual-frequency antenna performance while simplifying the antenna structure, giving the antenna better application potential.

[0026] The dual-band antenna 100 based on hybrid radiation mode described in this invention adopts a planar structure to achieve the functions of omnidirectional radiation in the low-frequency band and directional radiation in the high-frequency band, which has good antenna performance and low processing cost; it also achieves wide-band dual-band antenna performance and simplifies the antenna structure.

[0027] like Figure 1 and Figure 2 As shown, a dual-band antenna 100 based on a hybrid radiation mode includes a butterfly electric dipole element 10, a ground plane 12, a dielectric substrate 14, and a feed section 20.

[0028] Both the butterfly electric dipole unit 10 and the ground plane 12 are disposed on the upper surface of the dielectric substrate 14, and the power supply part 20 is disposed on the lower surface of the dielectric substrate. The butterfly electric dipole unit 10 and the ground plane 12 are provided with an opening slit 19, which is equivalent to a magnetic dipole.

[0029] The butterfly electric dipole unit 10 includes two identical dipole arms 102 and two identical connectors 104. The two dipole arms 102 are connected to the ground plane through the two connectors 104. The two dipole arms 102 are located on both sides of the opening slit 19, and the two connectors 104 are also located on both sides of the opening slit 19.

[0030] In this embodiment, the two dipole arms 102, the two connectors 104, and the ground plane 12 are all located in the same plane.

[0031] Specifically, both dipole arms 102 are fan-shaped conductive sheets, and the two connectors 104 are parallel to each other and are both rectangular; the ground plane 12 is rectangular in shape, the dielectric substrate 14 is rectangular in shape, and the opening slit 19 is rectangular in shape. Preferably, both dipole arms 102 are fan-shaped metal sheets.

[0032] The two dipole arms 102 are symmetrically arranged with respect to the opening slit 19, and the two connectors 104 are also symmetrically arranged with respect to the opening slit 19. The two dipole arms 102, the two connectors 104 and the ground plate 12 are integrally formed.

[0033] Both dipole arms 102 are arranged perpendicularly to the opening slit 19, that is, the electric dipole and the magnetic dipole are placed orthogonally, and the opening slit 19 is equivalent to a magnetic dipole.

[0034] The power supply section 20 is a power supply balun structure, which includes a first conductive section 22, a second conductive section 24 and a third conductive section 26. The first conductive section 22 and the third conductive section 26 are parallel, and the two ends of the second conductive section 24 are perpendicularly electrically connected to one end of the first conductive section 22 and one end of the third conductive section 26, respectively.

[0035] The first conductive part 22 and the third conductive part 26 are both rectangular in shape, the second conductive part 24 is trapezoidal in shape, the length of the first conductive part 22 is greater than the length of the third conductive part 26; the opening slit 19 is rectangular in shape; the first conductive part 22 and the third conductive part 26 are both parallel to the opening slit; the position of the power feeding balun structure partially corresponds to the position of the opening slit.

[0036] In this embodiment, the dual-band antenna 100 is used to achieve omnidirectional radiation at low frequencies and directional radiation at high frequencies.

[0037] Specifically, the dual-band antenna 100 operates in a half-wavelength mode of an electric dipole at low frequencies to achieve omnidirectional radiation. At high frequencies, the dual-band antenna 100 operates in a full-wavelength mode where an electric dipole is superimposed with an equivalent magnetic dipole from the opening slit to form a magnetoelectric dipole, achieving directional radiation.

[0038] In this embodiment, the low frequency is 1.65~1.85GHz, and the high frequency is 3.05~3.45GHz. Preferably, the low frequency is 1.75GHz, and the high frequency is 3.25GHz.

[0039] Specifically, in this embodiment, the length of a pair of dipole arms 102 of the butterfly electric dipole unit 10 is 58 mm. The length and width of the opening slit 19 are 34 mm and 3 mm, respectively. The length and width of the ground plane 12 are 38 mm and 3 mm, respectively.

[0040] The dielectric substrate 14 is made of FR4 material and has a dielectric constant of 4.4. The length and width of the dielectric substrate 14 are 88 mm and 46 mm, respectively. Figure 3 As shown, the thickness of the dielectric substrate 14 is 1 mm.

[0041] Figure 4 This is a schematic diagram showing the test results of the reflection performance S11 of the dual-frequency antenna 100 according to an embodiment of the present invention. From... Figure 4 As can be seen, the dual-band antenna 100 has very little or almost no reflection at the low frequency of 1.75 GHz, and very little or almost no reflection at the high frequency of 3.25 GHz; this proves that the dual-band antenna 100 has excellent performance at both the low frequency of 1.75 GHz and the high frequency of 3.25 GHz.

[0042] Figure 5This is the low-frequency radiation pattern of the dual-band antenna 100 according to an embodiment of the present invention. The dual-band antenna 100 operates in a half-wavelength mode of an electric dipole at a low frequency of 1.75 GHz. Figure 5 It can be seen that the dual-band antenna 100 achieves omnidirectional radiation at a low frequency of 1.75 GHz.

[0043] Figure 6 This is the high-frequency radiation pattern of the dual-band antenna 100 according to an embodiment of the present invention. The dual-band antenna 100 operates in a high-frequency mode by superimposing an electric dipole in full-wavelength mode with an equivalent magnetic dipole at the opening slot to form a magnetoelectric dipole. Figure 6 It can be seen that the dual-band antenna 100 achieves directional radiation at a high frequency of 3.25 GHz (in Figure 6 As shown in the high-frequency radiation pattern, the dual-frequency antenna 100 exhibits excellent radiation performance within a directional angular range of 30° to 150°.

[0044] The dual-band antenna 100 proposed in this invention can achieve omnidirectional radiation at low frequencies and directional radiation at high frequencies. Low frequencies can be used to ensure stable connection of devices over a large range, while high frequencies are used in scenarios requiring high-speed data transmission.

[0045] The antenna 100 of the present invention adopts a planar structure to realize the functions of omnidirectional radiation in the low-frequency band and directional radiation in the high-frequency band, which has good antenna performance and low processing cost. This design enables the antenna 100 to achieve dual-band operation of hybrid radiation mode with a simple planar structure, and the planar structure also makes the antenna 100 easy to install and suitable for more scenarios.

[0046] The dual-band antenna 100 of the present invention achieves omnidirectional radiation at low frequencies by utilizing the half-wavelength mode of an electric dipole; and at high frequencies, it achieves omnidirectional radiation by superimposing the full-wavelength mode of an electric dipole and the equivalent magnetic dipole of the opening gap to form a magnetoelectric dipole. This design enables the dual-band antenna 100 to achieve dual-band operation with a mixed radiation mode with a simple planar structure.

[0047] The dual-band antenna 100 of this invention achieves high-frequency directional radiation by superimposing an electric dipole and an equivalent magnetic dipole through an opening slot to form a magnetoelectric dipole. For the magnetoelectric dipole to be effective, the electric and magnetic dipoles must have comparable amplitudes, a 90-degree phase difference, and be orthogonally positioned. This invention adjusts the antenna's structure and parameters to regulate the phase and amplitude of the electric and magnetic dipoles, ensuring their superposition.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A dual-band antenna based on a hybrid radiation mode, characterized in that, It includes a butterfly electric dipole unit, a ground plane, a dielectric substrate, and a power supply section; The butterfly electric dipole unit and the ground plane are both disposed on the upper surface of the dielectric substrate, and the power supply part is disposed on the lower surface of the dielectric substrate. The butterfly electric dipole unit and the ground plane together have an opening gap, which is equivalent to a magnetic dipole. The butterfly electric dipole unit includes two dipole arms and two connectors. The two dipole arms are respectively connected to the ground plane through the two connectors. The two dipole arms are respectively located on both sides of the opening gap, and the two connectors are also respectively located on both sides of the opening gap.

2. The dual-band antenna according to claim 1, characterized in that, The two dipole arms, the two connectors, and the ground plane are all located in the same plane.

3. The dual-band antenna according to claim 1, characterized in that, Both dipole arms are fan-shaped conductive sheets, the two connectors are parallel to each other and are both rectangular; the ground plane is rectangular in shape, the dielectric substrate is rectangular in shape, and the opening gap is rectangular in shape.

4. The dual-band antenna according to claim 1, characterized in that, The two dipole arms are symmetrically arranged with respect to the opening gap, and the two connectors are also symmetrically arranged with respect to the opening gap; the two dipole arms, the two connectors, and the ground plane are integrally formed.

5. The dual-band antenna according to claim 1, characterized in that, Both dipole arms are arranged perpendicular to the opening gap.

6. The dual-frequency antenna according to claim 1, characterized in that, The power supply section is a power supply balun structure, which includes a first conductive section, a second conductive section and a third conductive section. The first conductive section and the third conductive section are parallel, and the two ends of the second conductive section are respectively perpendicularly electrically connected to one end of the first conductive section and one end of the third conductive section.

7. The dual-frequency antenna according to claim 6, characterized in that, The first and third conductive parts are both rectangular in shape, the second conductive part is trapezoidal in shape, and the length of the first conductive part is greater than the length of the third conductive part; the opening slit is rectangular in shape; the first and third conductive parts are both parallel to the opening slit; the position of the feeding balun structure partially corresponds to the position of the opening slit.

8. The dual-band antenna according to claim 1, characterized in that, The dual-frequency antenna is used to achieve omnidirectional radiation at low frequencies and directional radiation at high frequencies.

9. The dual-frequency antenna according to claim 8, characterized in that, The dual-frequency antenna operates in a half-wavelength mode of an electric dipole at low frequencies to achieve omnidirectional radiation. The dual-frequency antenna operates in a high-frequency mode by superimposing an electric dipole of full wavelength mode with an equivalent magnetic dipole of the opening slit to form a magnetoelectric dipole, thereby achieving directional radiation.

10. The dual-frequency antenna according to claim 8, characterized in that, The low frequency is 1.65~1.85GHz, and the high frequency is 3.05~3.45GHz.

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