A broadband circularly polarized magnetic electric dipole antenna

Abstract

The application discloses a broadband circularly polarized magnetoelectric dipole antenna, which comprises a dielectric plate, four magnetoelectric dipole units, a reflector, a feed structure and a feed network. The flowing path of the radiation current is improved by opening a rectangular slot on the electric dipole and a rectangular slot and an n-shaped slot on the magnetic dipole, and the impedance bandwidth is widened. The signal can be coupled to the radiator by adopting a Γ-shaped feed structure, and the orthogonal cross feed is realized through the feed network composed of three-dimensional parallel coupling lines. The antenna has a simple and compact structure, the reflection coefficient is less than -10 dB within 2.81-9.13 GHz, the relative bandwidth reaches 105%, the 3dB axial ratio bandwidth reaches 103%, and the antenna has good directivity and high gain within the entire impedance bandwidth range. Meanwhile, the antenna can be applied to the fields of wireless communication, radar system, satellite communication and the like to meet the communication requirements in different scenes.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and specifically to a broadband circularly polarized magnetoelectric dipole antenna. Background Technology

[0002] With the development of communication technology, the requirements for antenna performance are becoming increasingly stringent. In traditional communication systems, single-polarized antennas are widely used, but with the increase in communication frequency and the demand for higher data transmission rates, circularly polarized antennas have gradually become an important solution.

[0003] Circularly polarized antennas can simultaneously transmit and receive electromagnetic waves in two orthogonal directions, thus providing higher signal transmission capacity and system flexibility. They are widely used in wireless communication, radar systems, satellite communication, and other fields to meet communication needs in different scenarios.

[0004] Magnetoelectric dipole antennas are an important type of antenna used in wireless communication and radar systems. Broadband circularly polarized magnetoelectric dipole antennas, as a novel antenna structure, have attracted widespread attention. This antenna can achieve broadband operation and dual circular polarization characteristics, simultaneously producing polarized electromagnetic waves in both the horizontal and vertical directions. The advantages of this antenna structure include compact size, simple manufacturing process, and low cost. Its characteristics make this invention promising for a wide range of applications, extending to fields such as magnetic resonance imaging, magnetic field detection and measurement, and space propulsion. Current art regarding broadband circularly polarized magnetoelectric dipole antennas is available in references 1-3.

[0005] Reference 1: Chinese patent document with patent publication number CN115832706A.

[0006] Reference 1 discloses a miniaturized broadband circularly polarized magnetoelectric dipole antenna, which includes an upper metal patch, an upper dielectric substrate, a middle metal patch, a lower dielectric substrate, and a lower metal patch. The upper metal patch consists of two pairs of square metal pieces rotated 45°, each with a metal through-hole penetrating the upper dielectric substrate and connecting the upper and middle metal patches. Circular polarization is achieved by etching centrally symmetrical rectangular corners and metal through-holes into one pair of square metal pieces. The middle metal patch covers the entire upper surface of the lower dielectric substrate and has a pair of irregularly shaped, 45° rotated cross slots etched into it. The lower dielectric substrate connects the middle and lower metal patches. The lower metal patch consists of a microstrip transmission line composed of rectangular metal pieces at both ends and a three-quarter circular ring. This antenna has advantages such as compact structure, concentrated radiation direction, wide bandwidth, wide axial ratio bandwidth, high gain, and high flexibility.

[0007] Reference 2: Chinese patent document with patent publication number CN116191011A.

[0008] Reference 2 discloses a broadband circularly polarized magnetoelectric dipole antenna for 5G communication. The antenna includes an upper metal patch, an upper dielectric substrate, a middle metal patch, a lower dielectric substrate, and a lower metal patch. The upper metal patch includes two pairs of metal plates, each with a set of metal vias that penetrate the upper dielectric substrate and connect the upper and middle metal patches. One pair of rectangular metal plates has rectangular corners etched and metal vias etched to achieve circular polarization. The other pair of rectangular metal plates has triangular corners etched and tilted elliptical metal patches added to expand the axial ratio bandwidth. The middle metal patch covers the entire upper surface of the lower dielectric substrate and has a rectangular slot etched into it. The lower metal patch consists of a stepped microstrip transmission line composed of three different rectangles, which, combined with the rectangular slot, makes the antenna more compact and the radiation direction more concentrated. The antenna has advantages such as wide operating bandwidth, wide axial ratio bandwidth, high and stable gain, and applicability to 5G communication systems.

[0009] Reference 3: Chinese patent document with patent publication number CN113078459A.

[0010] Reference 3 discloses a low-profile broadband circularly polarized magnetoelectric dipole antenna, belonging to the field of antenna technology. This antenna innovatively designs a slot on the rectangular metal sheet of the magnetoelectric dipole antenna, extending the current path and reducing the antenna profile height from the conventional 0.25λ to 0.11λ (λ being the spatial wavelength at the center frequency). This effectively overcomes the drawback of a high profile in circularly polarized magnetoelectric dipole antennas. Furthermore, reducing the profile height does not increase the complexity of the three-dimensional structure, giving the antenna advantages such as simple structure and ease of mass production. In addition, the antenna still maintains advantages such as large bandwidth, high radiation gain, symmetrical radiation pattern, and low back radiation. Summary of the Invention

[0011] The purpose of this invention is to provide a novel broadband circularly polarized magnetoelectric dipole antenna to further improve the polarization characteristics and bandwidth of the antenna.

[0012] To address the shortcomings of the aforementioned technical problems, the present invention adopts the following technical solution: a broadband circularly polarized magnetoelectric dipole antenna, comprising a dielectric substrate, four magnetoelectric dipole units, a reflector, a resonant ring, a feeding structure, and a feeding network;

[0013] The reflector consists of a metal base plate and an annular metal side plate vertically mounted on the metal base plate, with the metal base plate positioned on the upper surface of the dielectric plate.

[0014] The four magnetoelectric dipole units are symmetrically distributed on the metal base plate and located at the center of the metal side plate, with a cross-shaped gap between the four magnetoelectric dipole units.

[0015] Each magnetoelectric dipole unit consists of a magnetic dipole vertically mounted on a metal base plate and an electric dipole horizontally mounted on top of the magnetic dipole.

[0016] The magnetic dipole is composed of an L-shaped horizontal part and an L-shaped vertical part arranged along the outer edge of the L-shaped horizontal part. The two sides of the vertical part are respectively provided with horizontally arranged rectangular slots, and the middle part of the vertical part is provided with an n-shaped slot, which is located below the rectangular slot.

[0017] The electric dipole has two parallel rectangular slots.

[0018] The power supply structure includes a pair of Γ-shaped feed lines located at the "+" gap of four magnetoelectric dipole units. The pair of feed lines are arranged orthogonally to each other. Each feed line includes a vertical part and a horizontal part that is vertically set at the top of the vertical part. The horizontal part of one feed line is located above the horizontal part of the other feed line. The vertical part of the feed line is connected to a metal column, which passes through a metal base plate and is placed inside the dielectric plate.

[0019] The power supply network includes a coupler and an excitation port. The excitation port is connected to the input of the coupler via a microstrip line, and the output of the coupler is connected to two metal pillars via microstrip lines.

[0020] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the rectangular holes on the four magnetoelectric dipole units are arranged in a rotationally symmetrical manner.

[0021] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the coupler is a vertical structure, which includes upper and lower copper layers and an intermediate dielectric layer.

[0022] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the filling material of the intermediate dielectric layer is Rogers RO5880 with a relative permittivity of 2.2.

[0023] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention, a metal resonant ring is also provided at the top of the metal side plate of the reflector.

[0024] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the filling material of the dielectric substrate is Rogers RO4350B with a relative permittivity of 3.66.

[0025] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the filling material of the Γ-shaped feed line is FR4 with a relative permittivity of 4.2.

[0026] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the metal base plate is a square structure, and the metal side plate is formed by joining two arc-shaped metal plates together, with the outer diameter of the metal side plate being the same as the side length of the metal base plate.

[0027] As a further optimization of the broadband circularly polarized magnetoelectric dipole antenna of the present invention: the excitation port is connected to the input end of the coupler via a 50-ohm microstrip line, and the output end of the coupler is connected to two metal pillars via 50-ohm microstrip lines respectively.

[0028] The purification device of the present invention has the following beneficial effects:

[0029] I. This invention uses four magnetoelectric dipole elements as the main radiation source, employs a coupling method, and utilizes a circular metal reflector to enhance performance in the radiation direction. The combination of slotted radiating elements and a metal resonant ring enables the antenna to achieve high bandwidth and gain. The antenna's feed network uses a dual-port feeding method to feed the radiating elements, generating signals with the same amplitude but a 90° phase difference to the radiator, thereby producing a circularly polarized wave. In addition, the use of a three-dimensional parallel coupled-line feeding method reduces the structural size of the feed network and effectively improves the coupling degree of the coupler.

[0030] Second, the broadband circularly polarized magnetoelectric dipole antenna of the present invention has excellent polarization characteristics, and the main polarization and cross polarization are significantly different in the radiation direction. The antenna can achieve a -10dB impedance bandwidth of 105% and a 3dB axial ratio bandwidth of 103%, which has great application potential in microwave communication and detection systems. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the split structure of the broadband circularly polarized magnetoelectric dipole antenna of the present invention;

[0032] Figure 2 This is a side view of the broadband circularly polarized magnetoelectric dipole antenna of the present invention.

[0033] Figure 3 This is a top view of the broadband circularly polarized magnetoelectric dipole antenna of the present invention.

[0034] Figure 4 This is a schematic diagram of the feed network for the broadband circularly polarized magnetoelectric dipole antenna of the present invention;

[0035] Figure 5 The reflection coefficient and gain diagram of the broadband circularly polarized magnetoelectric dipole antenna of the present invention are shown.

[0036] Figure 6 This is a diagram showing the axial ratio of the broadband circularly polarized magnetoelectric dipole antenna of the present invention.

[0037] Figure 7The radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of the present invention in the xoz and yoz planes at 4 GHz are shown.

[0038] Figure 8 The radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of the present invention in the xoz and yoz planes at 6 GHz are shown.

[0039] Figure 9 The radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of the present invention in the xoz and yoz planes at 8 GHz are shown.

[0040] The markings in the diagram are: 1. Dielectric substrate, 2. Magnetoelectric dipole unit, 3. Reflector, 3-1. Metal base plate, 3-2. Metal side plate, 3-3. Metal resonant ring, 4. Excitation port, 5. Feed line, 6. Metal pillar, 7. Coupler, 8. Microstrip line. Detailed Implementation

[0041] To better understand the present invention, the following embodiments further illustrate the content of the present invention, but the content of the present invention is not limited to the following embodiments.

[0042] like Figure 1 As shown: A broadband circularly polarized magnetoelectric dipole antenna includes a dielectric substrate 1, four magnetoelectric dipole elements 2, a reflector 3, a feeding structure, and a feeding network.

[0043] The reflector 3 consists of a metal base plate 3-1 and an annular metal side plate 3-2 vertically disposed on the metal base plate 3-1. The metal base plate 3-1 is disposed on the upper surface of the dielectric plate 1.

[0044] A metal resonant ring 3-3 is also provided at the top of the metal side plate 3-2 of the reflector 3. When the antenna is excited, the metal resonant ring 3-3 resonates with the magnetoelectric dipole radiator, and also generates radiation to a certain extent, which plays a role in improving gain and increasing bandwidth.

[0045] Four magnetoelectric dipole units 2 are symmetrically distributed on the metal base plate 3-1 and located at the center of the metal side plate 3-2, forming a cross-shaped gap between the four magnetoelectric dipole units 2.

[0046] When the antenna is excited, the metal base plate 3-1 can reflect electromagnetic waves and also generate radiation to a certain extent, which plays a role in directionality and increasing bandwidth, while the circular metal side plate 3-2 reduces the diffraction effect of electromagnetic waves.

[0047] The metal base plate 3-1 is a standard square structure. The circular metal side plate 3-2 is a 1 / 4 arc-shaped metal plate set around the metal base plate 3-1. The outer diameter of the circular metal side plate 3-2 is the same as the side length of the metal base plate 3-1.

[0048] Each magnetoelectric dipole unit 2 consists of a magnetic dipole 2-1 vertically mounted on a metal base plate 3-1 and an electric dipole 2-2 horizontally mounted on top of the magnetic dipole 2-1.

[0049] The magnetic dipole 2-1 consists of an L-shaped horizontal part and an L-shaped vertical part arranged along the outer edge of the L-shaped horizontal part. The two sides of the vertical part are respectively provided with horizontally arranged rectangular slots. The middle part of the vertical part is provided with an n-shaped slot, and the n-shaped slot is located below the rectangular slot. The L-shaped vertical part of the magnetic dipole 2-1 is composed of two mutually perpendicular parts. Half of the n-shaped slot is located on one part, and the other half is located on the other part.

[0050] Two parallel rectangular slots are formed on the electric dipole 2-2, and the rectangular holes on the four magnetoelectric dipole units 2 are arranged in a rotationally symmetrical manner. By setting slots of a certain shape, the flow path of the radiated current is widened, and the impedance bandwidth is increased.

[0051] The design of n-shaped and rectangular slots can enhance the radiation of an electric dipole. Among the radiation produced by an electric dipole, the strongest wave is one with a length equal to that of the dipole. By loading slots perpendicular to the direction of the cutting electric field, the length of the current flow path on its surface can be extended, making the current more concentrated and thus changing the wavelength of its radiation.

[0052] The magnetoelectric dipole unit 2 is used to achieve the effects of magnetic dipole 2-1 and electric dipole 2-2. The width of electric dipole 2-2 conforms to the principle of half-wave dipole. It is supported by magnetic dipole 2-1 fixed on metal base plate 3-1. Magnetic dipole 2-1 is electrically connected to metal base plate 3-1 to form a short circuit.

[0053] The power supply structure includes a pair of Γ-shaped feed lines 5 located at the "+" gaps of the four magnetoelectric dipole units 2. The pair of feed lines 5 are arranged orthogonally to each other, and each feed line 5 includes a vertical section and a horizontal section vertically positioned at the top of the vertical section. The feed lines 5 are supported by a dielectric material, specifically FR4. For ease of processing, the horizontal section of the feed line 5 with the higher horizontal section is broken into two parts, which are directly connected together by a metal sheet. Both the vertical and horizontal sections are metal patches attached to the dielectric material. The horizontal section of one feed line 5 is located above the horizontal section of the other feed line 5. The vertical section of the feed line 5 is provided with a metal post 6, which passes through a metal base plate 3-1 and is placed inside the dielectric plate 1.

[0054] When the antenna is excited, electric dipole 2-2 generates current through coupling with the horizontal portion of the Γ-shaped feed line 5, achieving the electric dipole 2-2 effect. Magnetic dipole 2-1 mainly generates current through coupling with the vertical portion of the Γ-shaped (inverted L-shaped) feed line 5, achieving the magnetic dipole effect. Ultimately, electric dipole 2-2 and magnetic dipole 2-1 complement each other to achieve orthogonal electromagnetic radiation. The two rectangular slots on electric dipole 2-2 and the I-shaped and n-shaped slots on magnetic dipole 2-1 increase the current flow path, thus broadening the bandwidth and achieving a better radiation effect.

[0055] The electric dipoles 2-2 in each pair of adjacent magnetoelectric dipole units 2 are spaced a certain distance apart to achieve good isolation between the two ports. Both the magnetic dipole 1-2 and the electric dipole 1-1 are made of copper, achieving low cost.

[0056] The power supply network includes a coupler 7 and an excitation port 4. The excitation port 4 is connected to the input terminal of the coupler 7 via a microstrip line, and the output terminal of the coupler 7 is connected to two metal pillars 6 via microstrip lines.

[0057] Coupler 7 has a vertical structure, consisting of upper and lower copper layers and an intermediate dielectric layer. This structure allows the feed network to output two signals of equal amplitude but 90° phase difference, which are then transmitted to the radiator.

[0058] The broadband circularly polarized magnetoelectric dipole antenna of this invention achieves a -10dB impedance bandwidth of 105% and a 3dB axial ratio bandwidth of 103%. At the same time, it has good directivity and high gain throughout the entire impedance bandwidth range, and the bandwidth range can meet the requirements of S and C bands.

[0059] To ensure good main lobe gain and axial ratio in the radiation pattern of the circularly polarized antenna, the height of the metal side plate 3-2 of the circular reflector is set to 9mm, and the structure of the metal side plate 3-1 is implemented using a 1mm thick copper plate. The width of the circular segment of the metal resonant ring 3-3 is 3mm, the outer radius of the ring is 33mm, and it is implemented using a 1mm thick copper plate.

[0060] The metal base plate 3-1 is made of copper, and there are concentric circular holes with a radius of 0.35 mm at the passage of the metal column 6. The metal column 6 uses copper wire with a radius of 0.35mm, and the two feed lines 5 are positioned at an angle of ±45° to achieve the effect of dual-port input.

[0061] The dielectric material for dielectric substrate 1 is Rogers RO4350B, and the dielectric material for the coupler dielectric substrate is Rogers RO5880. The thickness of dielectric substrate 1 is 0.5 mm, the thickness of the coupler dielectric layer is 0.254 mm, and the thickness of the Γ-type feeder 5 is 2 mm.

[0062] The dielectric layer of coupler 7 is made of Rogers RO5880 material. Coupler 7 has a length of 8.5 mm and a coupling line height of 1.5 mm in its three-dimensional portion. The 50-ohm microstrip line width at the input and output ends of the feed network is 1.07 mm.

[0063] See Figure 1 In this example, the width of the Γ-shaped feeder 7 is 2mm, and the lengths of the two Γ-shaped feeders 7 at their vertical structures are 6.7mm and 6.2mm respectively. The lengths of the two Γ-shaped feeders 7 at their horizontal structures are equal, at 15.1mm. The boundary dimensions of the electric dipole 1-1 are 15.2mm wide, 15.2mm long, and 1mm thick.

[0064] like Figure 2 The specific dimensions are: Lf1 = 15.2mm, LL1 = 4.8mm, Hh1 = 7.8mm, W1 = 2mm, Hh2 = 5mm, LL2 = 4.8mm, Ws = 2mm, Ld1 = 6.2mm, H1 = 9mm, H2 = 11mm.

[0065] like Figure 3 The specific dimensions are: Lf = 15.1mm, Lf4 = 7.2mm, wx1 = 7mm, wy1 = 9mm, wy2 = 4.25mm, Ws = 2.6mm, Lf2 = 6mm, Lf3 = 4.8mm.

[0066] like Figure 4 The specific dimensions are as follows: W50 = 1.07mm, W6g = 0.2mm, L6g = 8.5mm, W6g1 = 1.5mm, L50 = 3mm, L51 = 2.9mm, L52 = 6mm, a = 29.52mm, b = 21.8mm.

[0067] like Figure 5 The figure shows the reflection coefficient and gain curves of the broadband circularly polarized magnetoelectric dipole antenna of the present invention. At the resonant frequency of 6.5 GHz, the minimum reflection coefficient of the antenna of the present invention is about -31.12 dB. The reflection coefficient is less than -10 dB in the range of 2.8 GHz to 9.1 GHz, and the relative bandwidth reaches 105%. At the same time, it has high gain over the entire impedance bandwidth.

[0068] like Figure 6 The diagram shows the axial ratio of the broadband circularly polarized magnetoelectric dipole antenna of the present invention. In the range of 2.8 GHz to 9 GHz, the axial ratio of the antenna is less than 3 dB, and its axial ratio bandwidth is 103%.

[0069] like Figure 7The figure shows the radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of the present invention in the xoz and yoz planes at 4 GHz. In the xoz plane, the gain of the left-hand circular polarization at the top is 8.9 dBi, the gain of the right-hand circular polarization at the top is -19.4 dBi, and the main lobe width of the main polarization is 98 degrees with a 3 dB main polarization. In the yoz plane, the gain of the left-hand circular polarization at the top is 8.9 dBi, the gain of the right-hand circular polarization at the top is 19.1 dBi, and the main lobe width of the main polarization is 98.5° with a 3 dB main polarization.

[0070] like Figure 8 The diagram shows the radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of this invention in the xoz and yoz planes at 6 GHz. In the xoz plane, the gain of the left-hand circular polarization at the top is 11.1 dBi, the gain of the right-hand circular polarization at the top is -17.8 dBi, and the main lobe width of the main polarization is 82° at 3 dB. In the yoz plane, the gain of the left-hand circular polarization at the top is 11.2 dBi, the gain of the right-hand circular polarization at the top is -17.1 dBi, and the main lobe width of the main polarization is 85° at 3 dB.

[0071] like Figure 9 The diagram shows the radiation patterns of the broadband circularly polarized magnetoelectric dipole antenna of this invention in the xoz and yoz planes at 8 GHz. In the xoz plane, the gain at the apex of the left-hand circular polarization is 7.6 dBi, and the gain at the apex of the right-hand circular polarization is -29 dBi. The main lobe width of the main polarization (3 dB) is 46 degrees. In the yoz plane, the gain at the apex of the left-hand circular polarization is 7.8 dBi, and the gain at the apex of the right-hand circular polarization is -30 dBi. The main lobe width of the main polarization (3 dB) is 43°. The reflection coefficient was measured using a vector network analyzer, and other data were obtained through anechoic chamber testing.

[0072] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A broadband circularly polarized magnetoelectric dipole antenna, characterized in that: It includes a dielectric substrate (1), four magnetoelectric dipole units (2), a reflector (3), a feeding structure, and a feeding network; The reflector (3) consists of a metal base plate (3-1) and an annular metal side plate (3-2) vertically disposed on the metal base plate (3-1). The metal base plate (3-1) is disposed on the upper surface of the dielectric plate (1). The four magnetoelectric dipole units (2) are symmetrically distributed on the metal base plate (3-1) and located in the center of the metal side plate (3-2), forming a cross-shaped gap between the four magnetoelectric dipole units (2). Each magnetoelectric dipole unit (2) consists of a magnetic dipole (2-1) vertically mounted on a metal base plate (3-1) and an electric dipole (2-2) horizontally mounted on the top of the magnetic dipole (2-1); The magnetic dipole (2-1) consists of an L-shaped horizontal part and an L-shaped vertical part arranged along the outer edge of the L-shaped horizontal part. The two sides of the vertical part are respectively provided with horizontally arranged rectangular slots, and the middle part of the vertical part is provided with an n-shaped slot, which is located below the rectangular slot. The electric dipole (2-2) has two parallel rectangular slots. The power supply structure includes a pair of Γ-shaped feed lines (5) located at the "+" gap of the four magnetoelectric dipole units (2). The pair of Γ-shaped feed lines (5) are arranged orthogonally to each other. Each Γ-shaped feed line (5) includes a vertical part and a horizontal part that is vertically set at the top of the vertical part. The horizontal part of one Γ-shaped feed line (5) is located above the horizontal part of the other Γ-shaped feed line (5). The vertical part of the Γ-shaped feed line (5) is connected to a metal column (6). The metal column (6) passes through the metal base plate (3-1) and is placed inside the dielectric plate (1). The power supply network includes a coupler (7) and an excitation port (4). The excitation port (4) is connected to the input end of the coupler (7) via a microstrip line, and the output end of the coupler (7) is connected to two metal pillars (6) via a microstrip line (8).

2. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The four magnetoelectric dipole units (2) are arranged with rectangular slots arranged in a rotational symmetry.

3. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The coupler (7) is a vertical structure, which includes upper and lower copper metal layers and an intermediate dielectric layer.

4. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 3, characterized in that: The filling material of the intermediate dielectric layer is Rogers RO5880, with a relative permittivity of 2.

2.

5. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The metal side plate (3-2) of the reflector (3) is also provided with a metal resonant ring (3-3) at the top.

6. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The dielectric substrate (1) is filled with Rogers RO4350B material, which has a relative permittivity of 3.

66.

7. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The filling material of the Γ-shaped feed line (5) is FR4, and the relative permittivity is 4.

2.

8. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The metal base plate (3-1) has a square structure, and the metal side plate (3-2) is made of four arc-shaped metal plates joined together. The outer diameter of the metal side plate (3-2) is the same as the side length of the metal base plate (3-1).

9. The broadband circularly polarized magnetoelectric dipole antenna as described in claim 1, characterized in that: The excitation port (4) is connected to the input end of the coupler (7) via a 50-ohm microstrip line, and the output end of the coupler (7) is connected to two metal pillars (6) via a 50-ohm microstrip line.

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