A broadband dual-polarized magneto-electric dipole filtering antenna

Abstract

A broadband dual-polarized magnetoelectric dipole filter antenna includes a magnetic dipole patch and its dielectric substrate assembly, an electric dipole patch and its dielectric substrate, a bottom dielectric substrate, a pair of coaxial lines, and a pair of feed microstrip lines and their dielectric substrates. The electric dipole dielectric substrate has eight slots for connecting the magnetic dipole dielectric substrate assembly and four slots for connecting the feed microstrip line dielectric substrate assembly. The magnetic dipole dielectric substrate assembly has printed magnetic dipole patches, with the upper part connected to the electric dipole patches and the lower part connected to a metal ground. The feed microstrip lines are printed on the lower surfaces of the feed dielectric substrate and the electric dipole dielectric substrate and are fixedly connected to the bottom dielectric substrate. The upper surface of the bottom dielectric substrate has a printed metal ground and eight slots for connecting and fixing the magnetic dipole dielectric substrate assembly. Metallized circular through-holes allow the inner core of the coaxial lines to pass through, connecting the feed microstrip lines and the outer layer to the metal ground. Without introducing additional filtering circuitry, dual-polarization and bandpass filtering characteristics are achieved, meeting the frequency band requirements of LTE base station communication.

Description

Technical Field

[0001] This invention relates to the field of antenna technology, specifically to a broadband dual-polarized magnetoelectric dipole filter antenna, which can be applied to LTE wireless communication systems. Background Technology

[0002] With the rapid development of wireless communication systems and the increasing demand for high-capacity data transmission, more and more frequency bands are being applied to new fields. In recent years, my country has officially launched large-scale commercial 5G deployment, and 2G / 3G networks will be gradually phased out. The coexistence of LTE and 5G networks in base stations will be an inevitable trend in the coming years.

[0003] To reduce the overall size of the antenna, different antenna elements need to be placed close together, which leads to strong port coupling between different elements and ultimately poor isolation between their ports. A potential solution is to use a filtered antenna, integrating filtering and radiation functions, eliminating interconnections and matching networks between circuits, reducing losses, achieving miniaturization, and reducing inter-frequency coupling between closely spaced antenna elements in different frequency bands. Filtered antennas are typically implemented by modifying the feed structure, integrating the antenna and filter using coupling matrix theory, or introducing parasitic elements.

[0004] Building upon filtered antennas, to accommodate the coexistence of LTE and 5G networks, it is desirable to maximize the bandwidth of the filtered antenna. In broadband systems, the antenna effectively radiates across multiple frequency bands simultaneously. Since such antennas can be implemented with only a single component, the overall system size is relatively small. Common methods for implementing broadband antennas include introducing slot lines into the antenna radiator to adjust higher-order modes, appropriately increasing the antenna height, and introducing differential feeding structures.

[0005] The magnetoelectric dipole antenna was proposed by Professor Guiwen Lu in 2006 (KMLuk and H.Wong, “A new wideband unidirectional antenna element”, Int.J.Microw.Opt.Technol., vol.1, no.1, pp.35–44, Jun.2006.). It has the characteristics of wide bandwidth, stable radiation pattern, and large front-to-back ratio. It is also easy to expand into a dual-polarized antenna and easy to introduce filtering elements, making it suitable as a candidate antenna for base stations. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a broadband dual-polarized magnetoelectric dipole filter antenna. This antenna utilizes the principle of a transmission line step impedance filter (SIR filter) to integrate dual-polarization functionality and filtering characteristics into a single magnetoelectric dipole antenna design. This design does not introduce additional insertion loss and maintains the antenna's structural simplicity, thus meeting the communication bandwidth requirements of LTE networks for base station antennas.

[0007] This invention includes a magnetic dipole, an electric dipole, a bottom dielectric substrate, and a power supply structure;

[0008] The magnetic dipole comprises a magnetic dipole dielectric plate assembly and magnetic dipole patches. The magnetic dipole dielectric plate assembly comprises eight identical dielectric plates, arranged in pairs opposite each other, with four groups of dielectric plates arranged vertically and symmetrically along a vertical central axis. Magnetic dipole patches are printed on the surface of the magnetic dipole dielectric plate assembly. The magnetic dipole dielectric plate has a narrow dielectric plate section at the top to generate a step impedance in the equivalent transmission line. Each magnetic dipole dielectric plate assembly has a narrow dielectric plate section at the top. The magnetic dipole patches comprise eight metal patches, each metal patch being disposed on one side of a magnetic dipole dielectric plate. Every two parallel metal patches are grouped together and vertically disposed above, below, to the left, and to the right of the center position of the bottom dielectric plate, respectively.

[0009] The electric dipole includes an electric dipole dielectric plate and electric dipole patches. The electric dipole patches are printed on the upper surface of the electric dipole dielectric plate as a radiating structure. The electric dipole patches are four metal patches. Horizontal metal strips are printed on the lower surface of the electric dipole dielectric plate. The electric dipole dielectric plate has eight slots for connecting magnetic dipole dielectric plate groups and four slots for connecting feed dielectric plates.

[0010] The upper surface of the bottom dielectric substrate is printed with a metal ground. The bottom dielectric substrate has several slots through which the magnetic dipole dielectric substrate group and the power supply dielectric substrate group are fixed to the bottom dielectric substrate. The magnetic dipole patch contacts the metal ground through the slot. The bottom dielectric substrate also has metallized circular vias.

[0011] The feeding structure includes a pair of coaxial lines and five feeding dielectric plates. Vertical metal strips are provided on the inner surface of the feeding dielectric plates. Two of the feeding dielectric plates are vertically arranged and connected at the top to the electric dipole dielectric plate. The vertical metal strips are connected to the horizontal metal strips on the lower surface of the electric dipole dielectric plate, forming a feeding unit in one polarization direction. The remaining feeding dielectric plates are placed in the orthogonal direction to the aforementioned feeding units. One feeding dielectric plate is horizontally arranged, and two feeding dielectric plates are vertically arranged and connected to the horizontal feeding dielectric plate. The metal strips on the inner surface of the dielectric plates are connected, forming a feeding unit in another polarization direction. Electrical unit; the bottom of all vertical feed dielectric substrates is connected to the bottom dielectric substrate; the two feed units are feed microstrip lines with different horizontal heights and mutual orthogonality in two polarization directions. The feed microstrip lines adopt step impedance type η-type feed lines. The η-type feed lines include three step impedance microstrip line patches of different widths. The η-type feed lines are printed on the surface of the feed dielectric substrate and the lower surface of the electric dipole dielectric substrate; the outer metal of a pair of coaxial lines is connected to the metal ground through the metallized via edge on the bottom dielectric substrate, and the inner core of the coaxial lines passes through the bottom dielectric substrate and is connected to the metal surface of the feed structure microstrip line.

[0012] Low-frequency radiation null I is generated by the antenna structure, high-frequency sideband radiation null II is generated by the connection structure of magnetic dipole patch and electric dipole patch causing an impedance step in the equivalent transmission line, and high-frequency radiation null III is generated by changing the feed structure from the traditional Γ type to the step impedance type η type feed line. No filtering unit is introduced, which makes it easy to realize the integration of filtering function and antenna radiation effect.

[0013] The low-frequency radiation null point I is jointly controlled by the length of the electric dipole patch and the height of the magnetic dipole patch;

[0014] The high-frequency sideband radiation null II is generated by the equivalent transmission line step impedance, specifically controlled by the SIR structure on the magnetic dipole patch. The principle is that the magnetoelectric dipole antenna can be equivalent to an SIR filter. The high-order mode transmission null of the SIR filter can be controlled by the impedance difference, and the SIR structure of the magnetic dipole patch determines the impedance difference of the equivalent transmission line, thus determining the position of the high-frequency sideband radiation null II.

[0015] The high-frequency radiation null point III is controlled by the length and width of each part of the η-type feed line. The principle is that the feed line has a coupling path for each of the two opposing magnetoelectric dipole antennas. A phase difference of 180° is generated between the different paths. The length and width of different parts of the feed line can affect the coupling path, thereby controlling the frequency position corresponding to the radiation null point.

[0016] The upper part of the magnetic dipole dielectric plate assembly is connected to the electric dipole patch through the slot of the electric dipole dielectric plate to form a magnetoelectric dipole antenna.

[0017] The bottom dielectric substrate has 8 slots for connecting the magnetic dipole dielectric substrate group to the bottom dielectric substrate, and the metal ground is connected to the magnetic dipole patch through the slots.

[0018] The bottom dielectric substrate and the electric dipole dielectric substrate are provided with slots for connecting and fixing the feed dielectric substrate. The feed dielectric substrate is printed with feed microstrip lines, and a portion of the feed microstrip lines are printed on the lower surface of the electric dipole dielectric substrate.

[0019] The bottom dielectric substrate is provided with a metallized circular through hole for the coaxial cable to pass through and be fixedly connected. The outer metal layer of the coaxial cable is connected to the metal ground, and the inner core of the coaxial cable passes through the bottom dielectric substrate and is connected to the feed microstrip line.

[0020] The broadband dual-polarized magnetoelectric dipole filter antenna described in this invention covers the LTE network communication frequency band with a bandwidth of 47.6%, and can be used as a candidate antenna for base station applications.

[0021] The broadband dual-polarized magnetoelectric dipole filter antenna of the present invention has a low back lobe in its radiation pattern, a front-to-back ratio higher than 20dB, a cross-polarization level below -18dB, and a stable radiation mode.

[0022] The beneficial effects of this invention are:

[0023] (1) The broadband dual-polarized magnetoelectric dipole filter antenna of the present invention has a simple structure and does not increase the size compared with the traditional magnetoelectric dipole antenna. At the same time, without any filter network or other parasitic structures, the SIR filter of the equivalent circuit of the magnetoelectric dipole antenna is combined with the circuit at the end of the step impedance type η-type feed line to produce a bandpass filtering radiation effect, achieving an out-of-band rejection level of more than 17dB.

[0024] (2) The radiation null point of the broadband dual-polarized magnetoelectric dipole filter antenna involved in this invention can be controlled independently: by controlling the length of the electric dipole and the height of the magnetic dipole, the low-frequency radiation null point I can be controlled independently; by controlling the SIR structure of the magnetic dipole patch, the high-frequency sideband radiation null point II can be controlled independently; by controlling the length and width of each part of the feed line, the high-frequency radiation null point III can be controlled independently.

[0025] (3) The broadband dual-polarized magnetoelectric dipole filter antenna of the present invention achieves an impedance bandwidth of 47.6% (1.59-2.6GHz), covering the LTE communication frequency band, and can be applied to base station antennas for mobile communication.

[0026] (4) The broadband dual-polarized magnetoelectric dipole filter antenna involved in this invention has a stable radiation pattern, achieves a cross-polarization level below -18dB, and the main polarization exhibits a directional radiation mode with a front-to-back ratio higher than 20dB. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0028] Figure 2 This is an exploded view of the structure of an embodiment of the present invention;

[0029] Figure 3 This is a top view of the underlying media substrate;

[0030] Figure 4 This is a schematic diagram of the power supply structure;

[0031] Figure 5 This is a side view of a magnetic dipole dielectric plate assembly;

[0032] Figure 6 This is a top view of an electric dipole dielectric substrate;

[0033] Figure 7 The figure shows the simulation and test results of the antenna S-parameters of this invention changing with frequency;

[0034] Figure 8 The figure shows the simulation and test results of the antenna gain of this invention changing with frequency;

[0035] Figure 9 This is a simulation and test result diagram of the antenna radiation pattern of the present invention in the XOZ plane at a frequency of 1.7 GHz;

[0036] Figure 10 This is a simulation and test result diagram of the antenna of the present invention in the YOZ plane at a frequency of 1.7 GHz;

[0037] Figure 11 This is a simulation and test result diagram of the antenna radiation pattern of the present invention in the XOZ plane at a frequency of 2.5 GHz;

[0038] Figure 12 This is a simulation and test result diagram of the antenna pattern of the present invention in the YOZ plane at a frequency of 2.5 GHz. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0040] like Figures 1-6 As shown, the broadband dual-polarized magnetoelectric dipole filter antenna of this invention includes a bottom dielectric substrate 1, a feeding structure 2, a magnetic dipole dielectric substrate group 3, an electric dipole dielectric substrate 4, and a pair of coaxial lines 5.

[0041] The upper surface of the bottom dielectric substrate is provided with a metal surface 6 as a metal ground. A set of magnetic dipole dielectric substrate slots 10 and a set of power supply structure slots 11 are provided on the bottom dielectric substrate. The magnetic dipole dielectric substrate slots 10 are used to connect and fix the magnetic dipole dielectric substrate group. Through the slot, the narrower part of the dielectric substrate at the top of the magnetic dipole dielectric substrate contacts the electric dipole patch. The power supply structure slots 11 are used to fix the magnetic dipole dielectric substrate group 3 and the power supply structure 2. A pair of circular metallized vias 16 are provided on the power supply structure slots 11 for connecting and fixing the coaxial line to the metal ground. The magnetic dipole patch 9 of the magnetic dipole dielectric substrate group 3 contacts the metal ground through the power supply structure slots 11.

[0042] The power supply structure 2 includes a pair of coaxial lines 5, a first power supply unit and a second power supply unit. The first power supply unit and the second power supply unit are step impedance type η-type power supply lines with different horizontal heights and orthogonal to each other in two polarization directions. The η-type power supply line includes three step impedance microstrip line patches of different widths. The η-type power supply line is printed on the surface of the power supply dielectric plate and the lower surface of the electric dipole dielectric plate.

[0043] The first feeding unit is a step impedance type η-type feeding line, including two vertical metal strips 12 printed on the inner surfaces of two first feeding vertical dielectric plates 17 and a first horizontal metal strip 13 printed on the lower surface of the electric dipole dielectric plate 4. The two metal strips included in the vertical metal strip 12 have different lengths and widths, and are also different from the lengths and widths of the metal strip 13. The metal strips are in contact with each other. The vertical dielectric plate 17 is connected to the bottom dielectric plate and the electric dipole dielectric plate through slots.

[0044] The second power supply unit is another step impedance type η-type power supply line, including two vertical metal strips 14 printed on the inner surfaces of two second power supply vertical dielectric plates 16 and a second horizontal metal strip 15 printed on the lower surface of the power supply horizontal dielectric plate 19. The height of the second horizontal metal strip 15 is lower than the height of the first horizontal metal strip 13. The lengths and widths of the metal strips 14 and 17 are different, and the lengths and widths of the metal strips 15 are also different. The metal strips are in contact with each other. The second power supply vertical dielectric plate 16 is fixedly connected to the bottom dielectric plate and the power supply horizontal dielectric plate 19 through slots.

[0045] The magnetic dipole dielectric plate group 3 includes 8 identical dielectric plates, with each pair of plates arranged opposite each other as a group. The four groups of dielectric plates are arranged vertically and symmetrically along the vertical central axis. A narrow dielectric plate 20 is provided at the bottom of the dielectric plate for insertion into the square slot 10 of the bottom dielectric plate 1 and fixed to the bottom dielectric plate 1. The width of the bottom dielectric plate is adapted to the length of the square slot 10. A narrow dielectric plate is provided at the top of the dielectric plate and fixedly connected to the electric dipole dielectric plate. A metal surface is provided on the inner surface of the magnetic dipole dielectric plate group as a magnetic dipole patch 9. The bottom of the magnetic dipole patch is connected to the metal ground. A narrow patch portion 8 is provided at the top of the magnetic dipole patch, which forms an SIR structure with the lower part of the magnetic dipole patch, so that the equivalent transmission line generates a step impedance. The SIR structure can control the high roll-off radiation zero point II of the high-frequency sideband.

[0046] The electric dipole dielectric plate 4 is provided with a slot 21 to connect with the magnetic dipole dielectric plate assembly. The upper surface of the electric dipole dielectric plate 4 is provided with an electric dipole patch 7. The electric dipole patch includes four rectangular patches that are rotationally symmetrical along the vertical central axis and are connected to the end of the magnetic dipole patch 9 through the slot.

[0047] like Figure 7 The figure shown is a simulation and test result diagram of the antenna S-parameters-frequency of the present invention. The impedance matching in the passband is good, the operating frequency band is 1.59~2.60GHz, the impedance bandwidth reaches 47.6%, the return loss is below -13dB, the isolation in the operating frequency band is below -23dB, and the out-of-band return loss at low and high frequencies is close to 0dB. At this time, the antenna does not radiate energy, thus achieving the bandpass filtering effect.

[0048] like Figure 8 The figure shown is a simulation and test result diagram of the actual gain-frequency of the antenna of the present invention. It achieves three controllable radiation nulls, achieves an in-band gain of more than 8.5 dBi, an out-of-band gain of less than -10 dB, and an out-of-band rejection level of more than 17 dB.

[0049] like Figure 9 and 10 The image shows the simulated and tested normalized radiation patterns of the XOZ and YOZ planes of the antenna of this invention under 1.7GHz single-port excitation; as shown... Figure 11 and 12 The figure shows the simulated and tested normalized radiation patterns of the XOZ and YOZ planes of the antenna of the present invention when excited by a single port at 2.5 GHz. Due to the port symmetry, the radiation patterns of the other polarization port are basically the same, and the cross polarization level is finally achieved to be below -18 dB, the main polarization is in a directional radiation mode, and the front-to-back ratio is higher than 20 dB.

[0050] This invention introduces the characteristics of a transmission line step impedance resonator (SIR) filter into the magnetoelectric dipole antenna structure. Based on the low-frequency radiation null point I brought about by the inherent structure of the magnetoelectric dipole antenna, a narrower section is set on the upper part of the magnetic dipole, which can provide a connection function and be multiplexed as part of the equivalent transmission line step impedance of the magnetoelectric dipole, resulting in a high-roll-off radiation null point II in the high-frequency sideband; the traditional Γ-type feed line is changed to a step impedance type η-type feed line, resulting in another high-frequency radiation null point III.

[0051] The embodiments of the present invention have the following advantages:

[0052] (1) The antenna structure of the present invention is simple. The inherent structure of the magnetoelectric dipole antenna generates a low-frequency radiation null I. The connection structure between the magnetic dipole and the electric dipole is reused as part of the step impedance of the equivalent transmission line of the magnetoelectric dipole to obtain a high-frequency sideband radiation null II. The multi-path coupling of the step impedance type η-type feed line obtains a high-frequency radiation null III. The antenna size will not be further increased. No filter network or additional parasitic structure is needed to generate a bandpass filtering radiation effect, achieving an out-of-band rejection level of more than 17dB.

[0053] (2) The radiation null point of the antenna of the present invention can be controlled independently: by controlling the length of the electric dipole and the height of the magnetic dipole, the low-frequency radiation null point I can be controlled independently; by controlling the SIR structure on the top of the magnetic dipole, the high-frequency sideband radiation null point II can be controlled independently; by controlling the length and width of each part of the feed line, the high-frequency radiation null point III can be controlled independently.

[0054] (3) The antenna of the present invention has a stable radiation pattern, achieves a cross polarization level below -18dB, and the main polarization is in a directional radiation mode with a front-to-back ratio of more than 20dB.

[0055] (4) The antenna of the present invention achieves an impedance bandwidth coverage of 47.6% (1.59-2.60GHz), covering the LTE communication frequency band of the base station, and can become an alternative antenna for communication system applications.

[0056] The embodiments provided by the design method of this invention can be adapted to receive and transmit devices of wireless communication systems in different frequency bands by adjusting the size of the relevant structures as needed. Because the structure of this invention utilizes the isolation bandpass characteristics between two different ports of an orthogonally placed feed structure, and achieves good bandpass filtering characteristics using a magnetic dipole connection structure and feed structure, it does not increase the antenna size and does not add any other filtering circuits. The operating bandwidth covers the base station frequency band, making it suitable for low-loss, multi-band, multi-standard multi-antenna wireless communication scenarios. The antenna structure of this invention is relatively simple, without introducing additional filtering circuits, successfully achieving dual-polarization function and bandpass filtering characteristics, reducing structural complexity, and meeting the frequency band requirements of LTE base station communication.

[0057] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to these embodiments. Any modifications, combinations and simplifications made without departing from the principles and essence of the present invention are included within the protection scope of the present invention.

Claims

1. A broadband dual-polarized magnetoelectric dipole filter antenna, characterized in that... Includes magnetic dipoles, electric dipoles, underlying dielectric substrates, and power supply structures; The magnetic dipole comprises a magnetic dipole dielectric plate assembly and magnetic dipole patches. The magnetic dipole dielectric plate assembly comprises eight identical dielectric plates, arranged in pairs opposite each other, with four groups of dielectric plates arranged vertically and symmetrically along a vertical central axis. Magnetic dipole patches are printed on the surface of the magnetic dipole dielectric plate assembly. The magnetic dipole dielectric plate has a narrow dielectric plate section at the top to generate a step impedance in the equivalent transmission line. Each magnetic dipole dielectric plate assembly has a narrow dielectric plate section at the top. The magnetic dipole patches comprise eight metal patches, each metal patch being disposed on one side of a magnetic dipole dielectric plate. Every two parallel metal patches are grouped together and vertically disposed above, below, to the left, and to the right of the center position of the bottom dielectric plate, respectively. The electric dipole includes an electric dipole dielectric plate and electric dipole patches. The electric dipole patches are printed on the upper surface of the electric dipole dielectric plate as a radiating structure. The electric dipole patches are four metal patches. Horizontal metal strips are printed on the lower surface of the electric dipole dielectric plate. The electric dipole dielectric plate has eight slots for connecting magnetic dipole dielectric plate groups and four slots for connecting feed dielectric plates. The upper surface of the bottom dielectric substrate is printed with a metal ground. The bottom dielectric substrate has several slots through which the magnetic dipole dielectric substrate group and the power supply dielectric substrate group are fixed to the bottom dielectric substrate. The magnetic dipole patch contacts the metal ground through the slot. The bottom dielectric substrate also has metallized circular vias. The power supply structure includes a pair of coaxial lines and five power supply dielectric plates. Vertical metal strips are provided on the inner surface of the power supply dielectric plates. Two of the power supply dielectric plates are vertically arranged and connected to the top of the electric dipole dielectric plate. The vertical metal strips are connected to the horizontal metal strips on the lower surface of the electric dipole dielectric plate, forming a power supply unit with a polarization direction. The remaining feed dielectric plates are placed in the orthogonal direction of the aforementioned feed units. One feed dielectric plate is horizontally arranged, and two feed dielectric plates are vertically arranged and connected to the horizontal feed dielectric plate. The metal strips on the inner surface of the dielectric plates are connected to form a feed unit for another polarization direction. The bottom of all vertical feed dielectric plates is connected to the bottom dielectric plate. The two feed units are feed microstrip lines with different horizontal heights and mutual orthogonality in two polarization directions. The feed microstrip lines adopt the step impedance type η-type feed line. The η-type feed line includes three step impedance microstrip line patches of different widths. The η-type feed line is printed on the surface of the feed dielectric plate and the lower surface of the electric dipole dielectric plate. The outer metal of a pair of coaxial lines is connected to the metal ground through the metallized via edge on the bottom dielectric plate. The inner core of the coaxial lines passes through the bottom dielectric plate and is connected to the metal surface of the feed structure microstrip line. Its inherent structure generates low-frequency radiation null I, high-frequency sideband radiation null II is generated by the connection structure of magnetic dipole patch and electric dipole patch causing an impedance step in the equivalent transmission line, and high-frequency radiation null III is generated by changing the feed structure from the traditional Γ type to the step impedance type η type feed line. No filtering unit is introduced, which makes it easy to realize the integration of filtering function and antenna radiation effect. The low-frequency radiation null point I is controlled by both the length of the electric dipole patch and the height of the magnetic dipole patch; The high-frequency sideband radiation null II is generated by the equivalent transmission line step impedance, specifically controlled by the SIR structure on the magnetic dipole patch. The magnetoelectric dipole antenna is equivalent to an SIR filter. The high-order mode transmission null of the SIR filter is controlled by the impedance difference, and the SIR structure of the magnetic dipole patch determines the impedance difference of the equivalent transmission line, thus determining the position of the high-frequency sideband radiation null II. The high-frequency radiation null point Ⅲ is controlled by the length and width of each part of the η-type feed line; the feed line has a coupling path in each of the two opposing magnetoelectric dipole antennas, and a 180° phase difference is generated in the middle of the different paths. The length and width of different parts of the feed line affect the coupling path, thereby controlling the frequency position corresponding to the radiation null point. The upper part of the magnetic dipole dielectric plate assembly is connected to the electric dipole patch through the slot of the electric dipole dielectric plate to form a magnetoelectric dipole antenna. The bottom dielectric board is provided with 8 slots for connecting the magnetic dipole dielectric board assembly to the bottom dielectric board, and the metal ground is connected to the magnetic dipole patch through the slots. The bottom dielectric board and the electric dipole dielectric board are provided with slots for connecting and fixing the feed dielectric board. The feed dielectric board is printed with feed microstrip lines, and a portion of the feed microstrip lines are printed on the lower surface of the electric dipole dielectric board. The bottom dielectric substrate is provided with a metallized circular through hole for the coaxial cable to pass through and be fixedly connected. The outer metal layer of the coaxial cable is connected to the metal ground, and the inner core of the coaxial cable passes through the bottom dielectric substrate and is connected to the feed microstrip line.

2. The broadband dual-polarized magnetoelectric dipole filter antenna as described in claim 1, characterized in that... It covers the LTE network communication frequency band with a bandwidth of 47.6%, making it an alternative antenna for base station applications.

3. The broadband dual-polarized magnetoelectric dipole filter antenna as described in claim 1, characterized in that... Its radiation pattern has a low back lobe, an front-to-back ratio of over 20 dB, and a cross-polarization level below -18 dB, exhibiting a stable radiation mode.

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