A low profile miniaturized broadband omnidirectional vertically polarized slot antenna

Abstract

The embodiment of the application discloses a low-profile small-size wideband omnidirectional vertical polarization slot antenna, which comprises a dielectric plate arranged on the top of a metal radiator and in contact with the metal radiator, the metal radiator is in contact with the metal layer of the dielectric plate, the side wall of the metal radiator is provided with a slot, and an omnidirectional vertical polarization radiation mode is formed through equivalent magnetic current radiation of the slot; the metal feeding probe comprises an inner conductor and an outer conductor in a coaxial structure; a circular truncated cone-shaped metal cavity is formed in the metal shell, the inner conductor is connected with the bottom of the metal shell, the antenna radiator is arranged in the metal cavity, the outer conductor penetrates through the metal radiator, and the top end is in abutting contact with the metal layer of the dielectric plate and is fixedly connected through the assembly surface of the dielectric plate and the circular truncated cone-shaped shell to form a radome. The technical scheme provided by the embodiment of the application solves the problem that the existing omnidirectional antenna form is relatively complex in structure and it is difficult to realize more functions in one structure.

Description

Technical Field

[0001] This invention relates to, but is not limited to, the field of microwave and antenna technology, particularly to wireless communication equipment for aerospace vehicles, and especially to a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna. Background Technology

[0002] With technological advancements and accompanying industrial upgrades, the demand for communication technologies is gradually increasing. Modern communication places increasingly stringent requirements on antennas, constantly pursuing broadband and miniaturization of communication equipment. When installed on special platforms such as aircraft or ships, space constraints necessitate meeting requirements for lightweight, small size, and low profile while ensuring antenna performance. Omnidirectional antennas, capable of radiating energy in all directions across the horizontal plane, are widely used in shortwave communication, calibration communication, and missile-borne communication.

[0003] Currently, the most common type of omnidirectional antenna is the symmetrical dipole antenna, and many scholars and experts both domestically and internationally have studied this type of antenna and its variants. However, due to the fact that the symmetrical dipole is a resonant antenna with a narrow bandwidth, broadband characteristics can generally be obtained by changing the surface current distribution through loading. However, loading increases system complexity and design difficulty. Other antennas that can generate omnidirectional radiation modes include the Alford loop antenna and its variations, combined loop antennas, and rotating field antennas. The antenna types listed above require consideration of low profile characteristics, broadband characteristics, and omnidirectional vertical polarization radiation modes in their design, making the methods more complex and difficult to implement multiple functions in a single structure.

[0004] To address this limitation, this invention is based on a slot structure and aims to realize a vertically polarized omnidirectional antenna in a simple way. This antenna element has advantages such as miniaturization, low profile, and wide bandwidth. Summary of the Invention

[0005] The purpose of this invention is to provide a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna to solve the problem that existing omnidirectional antenna designs must consider low-profile characteristics, broadband characteristics, and omnidirectional vertical polarization radiation modes, resulting in complex antenna structures and difficulty in achieving multiple functions in a single structure.

[0006] The technical solution of the present invention: The present invention provides a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna, comprising: an antenna radiator, a radiating feed, a metal housing, and an antenna radome;

[0007] The antenna radiator is a cylindrical metal radiator 2; a circular dielectric plate 1 is disposed on top of the metal radiator 2 and in contact with it, and the metal radiator 2 is in contact with the metal layer of the dielectric plate 1; a slit is formed in the cylindrical side wall of the metal radiator 2, and an omnidirectional vertical polarization radiation mode is formed by the equivalent magnetic current radiation through the slit; a metal feed probe 3 is used as the radiation feed body, and the metal feed probe 3 includes an inner conductor and an outer conductor with a coaxial structure;

[0008] The metal housing 4 is generally shaped like a frustum, with a frustum-shaped metal cavity inside. The top of the housing has an assembly surface for the antenna radiator. The bottom of the inner conductor of the metal feed probe 3 is fixedly connected to the bottom of the frustum-shaped metal housing 4. The entire antenna radiator is placed inside the metal cavity, so that the outer conductor of the metal feed probe 3 passes through the metal radiator 2 and its top end abuts against the metal layer of the dielectric substrate 1. The probe 1 is fixedly connected to the assembly surface of the frustum-shaped housing 4 to form an antenna radome.

[0009] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0010] The cylindrical metal radiator 2 has a pair of horizontal slits opened along the circumferential direction on the side wall of the cylinder, and the position and structure of the pair of slits are symmetrically arranged, so as to form an omnidirectional mode by using the slit equivalent magnetic flow, and the polarization mode is vertical polarization.

[0011] The top end of the cylindrical metal radiator 2 is in contact with the metal layer of the dielectric plate 1.

[0012] The bottom end of the cylindrical metal radiator 2 is fixedly connected to the bottom of the metal shell 4.

[0013] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0014] The dielectric board 1 is a double-layer PCB board, with copper plating on the contact surface with the metal radiator 2. The metal layer is formed in the middle of the bottom surface of the dielectric board 1, and the metal layer is in contact with the top of the cylindrical slotted structure in the metal radiator 2.

[0015] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0016] An annular groove structure is provided at the contact surface between the metal layer of the dielectric plate 1 and the metal radiator 2, and the annular groove is metallized.

[0017] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0018] The metal housing 4 has a concave ring structure around its top mounting surface, and the medium plate 1 is entirely covered by the concave ring structure of the mounting surface and is fixedly connected by screws.

[0019] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0020] In the metal feed probe 3, an RF connector is used as the inner conductor, and a cylindrical metal conductor with a diameter larger than that of the RF connector is used as the outer conductor. The metal feed probe 3 is formed by drilling a hole on the bottom surface of the cylindrical metal conductor and inserting the RF connector into the cylindrical metal conductor.

[0021] The top of the outer conductor in the metal feed probe 3 is in direct contact with the metal layer of the dielectric substrate 1. The bottom end of the RF connector is provided with a flange, and a fixing hole is provided on the flange for fixing the RF connector to the bottom center boss of the frustum-shaped metal housing 4 with screws.

[0022] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0023] The dielectric substrate 1 has a non-metallic annular region 7 on its metal layer for forming broadband impedance matching; and the dielectric substrate 1 has a blind slot 8 and a metallized blind via, so that the metal feed probe 3 can penetrate into the dielectric substrate 1 to form a nested structure.

[0024] Alternatively, in the low-profile miniaturized broadband omnidirectional vertically polarized slot antenna described above,

[0025] The edges of the metal radiator 2 and the edges of the slits on the cylindrical sidewall of the metal radiator 2 are all rounded.

[0026] 10. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to any one of claims 1 to 6, characterized in that,

[0027] The frustum-shaped metal housing 4 is formed by hollowing out a cylindrical metal shell. The metal housing 4 is provided with an annular skirt around its perimeter, which is used to conformally mount the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna to the mounting platform.

[0028] The beneficial effects of this invention are as follows: This invention provides a low-profile, miniaturized, broadband omnidirectional vertically polarized slot antenna. Compared with existing vertically polarized omnidirectional antennas, its advantages lie in its novel design and simple, compact structure. It can achieve broadband, low-profile, vertically polarized omnidirectional radiation modes through slotting operations on a simple structure. Furthermore, the antenna structure is housed within a low-profile cavity formed by a metal shell 4, facilitating conformal installation with the mounting platform. In addition, this omnidirectional vertically polarized slot antenna is easy to manufacture using simple materials, significantly reducing design complexity and manufacturing costs, making it suitable for widespread application. It achieves low-profile and broadband characteristics with relatively simple technical means. Moreover, the design structure of the omnidirectional vertically polarized slot antenna provided by this invention can be extended to realize dual-frequency or even multi-frequency, vertical and horizontal dual-polarization, and other omnidirectional radiation modes; this helps reduce antenna costs, lighten the load on wireless communication systems, and achieve miniaturization and multi-functionality of communication systems. Attached Figure Description

[0029] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of the present invention and do not constitute a limitation on the technical solutions of the present invention.

[0030] Figure 1 A top view of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna provided in an embodiment of the present invention;

[0031] Figure 2 An exploded three-dimensional structural view of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna provided in an embodiment of the present invention.

[0032] Figure 3 A schematic diagram of the dielectric substrate in a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in an embodiment of the present invention;

[0033] Figure 4 A schematic diagram of the radiating feed in a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in an embodiment of the present invention;

[0034] Figure 5 A schematic diagram of the structure of the frustum-shaped metal shell in the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in an embodiment of the present invention;

[0035] Figure 6 A schematic diagram of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna mounted on a metal tray, as provided in an embodiment of the present invention.

[0036] Figure 7 For the present invention Figure 1 A schematic diagram of the antenna standing wave ratio simulation curve of the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in the embodiment shown.

[0037] Figure 8a For the present invention Figure 1 The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8a The mid-range elevation angles are 60°, 70°, 80°, and 90°; the frequency is 0.95 GHz.

[0038] Figure 8b For the present invention Figure 1 The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8b The mid-range elevation angles are 60°, 70°, 80°, and 90°; the frequency is 1.1 GHz.

[0039] Figure 8c For the present invention Figure 1 The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8c The mid-pitch angles are 60°, 70°, 80°, and 90°; the frequency is 1.25 GHz. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0041] As explained in the background section, existing omnidirectional antenna designs must consider low profile characteristics, ensure broadband characteristics, and maintain an omnidirectional vertical polarization radiation mode. This results in complex antenna structures that are difficult to implement with a single structure.

[0042] To address the problems associated with the aforementioned omnidirectional antenna designs, this invention provides a low-profile, miniaturized, broadband omnidirectional vertical polarization slot antenna. Based on a slot structure, it aims to achieve a vertically polarized omnidirectional antenna in a simple manner, and this antenna element has advantages such as miniaturization, low profile, and broadband.

[0043] The present invention provides the following specific embodiments, which can be combined with each other. For the same or similar concepts or processes, they may not be described again in some embodiments.

[0044] Figure 1 A top view of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna provided in an embodiment of the present invention; Figure 2 for Figure 1 An exploded three-dimensional structural diagram of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna provided in this embodiment of the invention. (Refer to...) Figure 1 andFigure 2 As shown, the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in this embodiment of the invention includes the following main structure: antenna radiator, radiating feeder, metal housing and radome.

[0045] Reference Figure 1 and Figure 2 The structure of the omnidirectional vertical polarization slot antenna shown is as follows: the antenna radiator is a cylindrical metal radiator 2, and a circular dielectric plate 1 is disposed on the top of the metal radiator 2 and in contact with it. The metal radiator 2 is in contact with the metal layer of the dielectric plate 1. A slot is opened in the cylindrical side wall of the metal radiator 2, and an omnidirectional vertical polarization radiation mode is formed by the equivalent magnetic current radiation through the slot. A metal feed probe 3 is used as the radiation feed body. The metal feed probe 3 includes an inner conductor and an outer conductor with a coaxial structure.

[0046] like Figure 2 As shown, the metal housing 4 is generally shaped like a frustum, with a frustum-shaped metal cavity inside. The top of the metal housing is a mounting surface for the antenna radiator. The bottom of the inner conductor of the metal feed probe 3 is fixedly connected to the bottom of the frustum-shaped metal housing 4. The entire antenna radiator is placed inside the metal cavity, so that the outer conductor of the metal feed probe 3 passes through the metal radiator 2, and the top of the probe abuts against the metal layer of the dielectric substrate 1. The probe 1 is fixedly connected to the mounting surface of the frustum-shaped housing 4 to form an antenna radome.

[0047] The omnidirectional vertically polarized slot antenna structure formed by the antenna radiator, radiating feeder, metal housing, and radome of this invention can be mounted on a relatively large metal tray 5, as shown in the embodiment of the invention. Figure 2 As shown, the metal tray 5 is, for example, a mounting platform for an omnidirectional vertically polarized slot antenna.

[0048] In one implementation of this invention, such as Figure 2 As shown, the omnidirectional vertically polarized slot antenna provided in this embodiment of the invention utilizes the equivalent magnetic flux radiation of the slot to form an omnidirectional vertically polarized radiation mode. Since a single slot radiates bidirectionally, in order to achieve and perfect the omnidirectional radiation mode, a pair of slots in the horizontal direction are opened along the circumferential direction on the side wall of the cylindrical metal radiator 2, and the positions and structures of the pair of slots are symmetrically arranged.

[0049] The slit structure on the upper sidewall of the metal radiator 2 provided in this implementation not only improves the symmetry of the entire structure, but also benefits the non-circularity feature, that is, it is beneficial to the omnidirectional radiation mode.

[0050] In practice, the top of the cylindrical metal radiator 2 is in contact with the metal layer of the dielectric plate 1; the bottom of the cylinder is fixedly connected to the bottom of the metal shell 4 by screws. The connection by screws ensures both electrical connection and structural stability.

[0051] In one implementation of this invention, the dielectric substrate 1 can be a double-layer PCB board with copper plating on one side. Specifically, copper plating is applied to the contact surface between the dielectric substrate 1 and the metal radiator 2, thereby forming a metal layer in the middle of the bottom surface of the dielectric substrate 1. This metal layer is in contact with the top of the cylindrical slotted structure in the metal radiator 2.

[0052] In this implementation, in order to ensure tight electrical contact between the dielectric substrate 1 and the metal radiator 2, an annular groove structure can be set at the contact surface between the dielectric substrate 1 and the metal radiator 2, and the annular groove can be metallized; this ensures stable electrical contact after installation and also facilitates installation.

[0053] In this embodiment of the invention, a concave ring structure is formed around the top mounting surface of the metal housing 4, and the dielectric plate 1 is entirely covered on the concave ring structure of the mounting surface. Screw holes are provided around the dielectric plate 1 for fixed connection with the frustum-shaped metal housing 4, ensuring that the metal housing 4 is firmly sealed and the dielectric plate 1 also serves as a radome for protection.

[0054] Figure 3 This is a schematic diagram of the dielectric substrate in a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in an embodiment of the present invention. In one implementation of the present invention, a non-metallic annular region 7 is formed on the metal layer of the dielectric substrate 1, which is beneficial for achieving broadband impedance matching. Based on the installation requirements of the metal feed probe 3 contacting the dielectric substrate 1, blind slots 8 and metallized blind holes are formed on the dielectric substrate 1. In this way, the metal feed probe 3 can penetrate deep into the dielectric substrate 1, which is equivalent to a certain nesting effect, which can ensure the effectiveness of the feed structure, facilitate installation, and ensure safety when the dielectric substrate 1 functions as an antenna radome. The dielectric substrate 1 in the embodiment of the present invention is, for example, a Taconic TLY-5.

[0055] Figure 4 This is a schematic diagram of the radiating feed element in a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna provided in an embodiment of the present invention. In one implementation of this embodiment, the metal feed probe 3 consists of two parts: one part uses an RF connector as the inner conductor and a cylindrical metal conductor with a diameter larger than the RF connector as the outer conductor. A hole is drilled in the bottom surface of the cylindrical metal conductor, and the RF connector is inserted into the cylindrical metal conductor to form a coaxial structure for the metal feed probe 3.

[0056] In practical applications, the RF connector in the metal feed probe 3 of this embodiment can be of type BMA, but its inner conductor diameter and length are both small, which cannot meet the actual feeding requirements. Therefore, the metal feed probe 3 is designed as a two-section structure. The top of the outer conductor of the metal feed probe 3 directly contacts the metal layer of the dielectric substrate 1. The bottom end of the RF connector is provided with a flange, and a fixing hole is opened on the flange. The RF connector is fixedly connected to the bottom center boss of the frustum-shaped metal housing 4. In specific implementation, threaded holes are machined at the corresponding positions on the bottom boss of the metal housing 4, and the RF connector is fixedly connected to the bottom boss of the metal housing 4 with screws. The purpose of using two sections of metal as the metal feed probe 3 in this embodiment of the invention is to achieve impedance matching while facilitating processing.

[0057] In the specific implementation of the omnidirectional vertical polarization slot antenna provided in this embodiment of the invention, the cylindrical metal radiator 2 with slots on the side walls is made of metal. The edges of the slots and the edges generated by the thickness of the metal after processing are all rounded, which is beneficial to the non-circularity characteristics of the antenna. In addition, the extension structure at the bottom is used to fix and connect to the bottom of the metal shell. The fixing screw holes are from bottom to top and should not be drilled through, which is also beneficial to the non-circularity characteristics of the antenna.

[0058] In addition, the frustum-shaped metal housing 4 in this embodiment of the invention is formed by hollowing out a cylindrical metal shell. The metal housing 4 is provided with an annular skirt around its perimeter, which is used to conformally mount the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna to the mounting platform.

[0059] The low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in this invention offers advantages over existing vertical polarization omnidirectional antennas. Its novel design and compact structure allow for broadband, low-profile, vertical polarization omnidirectional radiation modes through slotting operations on a simple structure. Furthermore, the antenna structure is housed within a low-profile cavity formed by a metal shell 4, facilitating conformal installation with the mounting platform. Additionally, this omnidirectional vertical polarization slot antenna is easy to manufacture using simple materials, significantly reducing design complexity and manufacturing costs, making it suitable for widespread application. It achieves low-profile and broadband characteristics with relatively simple technical means. Moreover, the design structure of the omnidirectional vertical polarization slot antenna provided in this invention can be extended to achieve dual-frequency or even multi-frequency, vertical and horizontal dual-polarization, and other omnidirectional radiation modes; this helps reduce antenna costs, lighten the load on wireless communication systems, and achieve miniaturization and multi-functionality of communication systems.

[0060] The following is an illustrative description of an implementation example of a low-profile miniaturized broadband omnidirectional vertically polarized slot antenna.

[0061] Implementation Example

[0062] This embodiment provides a low-profile miniaturized broadband omnidirectional vertical polarization slot antenna, whose main structure includes four parts: an antenna radiator, a radiating feeder, a metal housing, and an antenna radome.

[0063] like Figure 1 and Figure 2 As shown, by opening a slit in the cylindrical sidewall of the cylindrical metal radiator 2, and by having the cylindrical top of the metal radiator 2 contact the metal layer of the dielectric plate 1, the outer conductor 3 of the coaxial metal feed probe 3 excites the metal layer of the dielectric plate 1, and the inner conductor is fixedly connected to the bottom boss of the metal shell to form an electric wall structure. The omnidirectional vertical polarization radiation mode is formed by equivalent magnetofluid radiation through the slit in the cylindrical sidewall of the metal radiator 2.

[0064] The low-profile miniaturized broadband omnidirectional vertical polarized slot antenna provided in this embodiment consists of, from top to bottom, a dielectric substrate 1, a cylindrical metal radiator 2 with slots on its sidewalls, a coaxial metal feed probe 3, a frustum-shaped metal housing 4, and a metal tray 5. The dielectric substrate 1 is located on top of and in contact with the cylindrical metal radiator 2, with the contact surface contacting the metal layer of the dielectric substrate 1. The dielectric substrate 1 uses a double-layer PCB process with copper plating on one side. The dielectric substrate 1 is placed on top of the entire metal housing 4 and fixed to the frustum-shaped metal housing 4 by edge screws, also serving as an antenna radome, thus forming a closed metal cavity structure. The metal housing 4 is surrounded by skirts for mounting on a platform, facilitating conformal mounting with the platform.

[0065] like Figure 2 The diagram shows a three-dimensional structure of an omnidirectional vertically polarized slot antenna. A pair of symmetrical slots 6, controlling the vertically polarized omnidirectional radiation mode, are formed on the cylindrical sidewall of the metal radiator 2. A non-metallic annular region 7 is formed on the metal layer of the dielectric substrate 1. Blind slots and blind holes 8 are formed on the dielectric substrate 1 for easy installation and debugging. The metallized blind slot region is formed by the contact between the top of the metal feed probe 3 and the metal layer of the dielectric substrate 1.

[0066] like Figure 2 The cylindrical structure of the metal radiator 2 shown has slots on its sidewalls. A pair of horizontal slots 6 are created in the cylindrical sidewalls of the metal radiator 2, and the equivalent magnetic current between the slots forms a vertically polarized omnidirectional radiation mode. Excitation is achieved using a metal feedback probe 3, and impedance matching is achieved by capacitive loading at the top, which is reflected in the non-metallic annular region 7 of the dielectric substrate 1's metal layer in this slotted antenna structure. The top of the cylinder with slots 6 on the metal radiator 2 is in electrical contact with the dielectric substrate 1's metal layer. The outer conductor of the coaxial metal feed probe 3 directly excites the dielectric substrate 1's metal layer, forming an electric wall structure. The inner conductor is fixedly connected to the bottom boss of the metal housing 4, and the metal radiator 2 with its slotted structure is electrically connected to the metal housing 4 through a bottom cap structure.

[0067] like Figure 3 As shown, this embodiment provides a dielectric substrate 1 for a low-profile, miniaturized broadband omnidirectional vertically polarized slot antenna. Its bottom metal layer contacts the top of the cylindrical metal radiator 2. For stable feeding and ease of installation, slotted structures are made at both the contact surfaces between the metal feed probe 3 and the copper layer of the dielectric substrate 1, and between the cylindrical structure of the metal radiator 2 and the copper layer of the dielectric substrate 1. These slots are also metallized. The dielectric substrate 1 also functions as an antenna radome, therefore, it is secured to the cavity with screw holes around its perimeter.

[0068] like Figure 4 As shown, the metal feed probe 3 of the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in this embodiment consists of two metal conductors with different diameters: one part is the inner conductor of the RF connector itself, and the other part is a cylindrical metal conductor with a larger diameter.

[0069] like Figure 5 As shown, the metal housing 4 of the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in this embodiment is generally shaped as a low-profile frustum, which is hollowed out from a cylindrical metal part and has a skirt around it to facilitate its conformal installation with the mounting platform. Figure 2 and Figure 5 The platform is embodied by a large-diameter metal tray 5.

[0070] like Figure 6 The figure shows a schematic diagram of a low-profile miniaturized broadband omnidirectional vertical polarized slot antenna provided in an embodiment of the present invention mounted on a metal tray, with the metal tray 5 also marked on the figure.

[0071] like Figure 7 As shown, this is the present invention. Figure 1 A schematic diagram of the antenna standing wave ratio (VSWR) simulation curve of the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided in the embodiment shown. Figure 7 The full-wave simulation results of the omnidirectional vertically polarized slot antenna under fabrication conditions are shown. The standing wave curves show that the impedance bandwidth can cover 0.94-1.54 GHz.

[0072] like Figures 8a to 8c The image shows a simulation of the gain distribution of an omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane at different frequencies; the elevation angles are 60°, 70°, 80°, and 90°. Specifically, Figure 8a For the present invention Figure 1 The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8a The mid-range elevation angles are 60°, 70°, 80°, and 90°; the frequency is 0.95 GHz. Figure 8b For the present invention Figure 1The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8b The mid-range elevation angles are 60°, 70°, 80°, and 90°; the frequency is 1.1 GHz. Figure 8c For the present invention Figure 1 The simulation diagram of the gain distribution of the omnidirectional vertically polarized slot antenna at different elevation angles in the horizontal plane provided in the embodiment shown; Figure 8c The mid-pitch angles are 60°, 70°, 80°, and 90°; the frequency is 1.25 GHz.

[0073] To verify the feasibility of the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna provided by Shengli Road in this invention, the omnidirectional vertical polarization radiation mode was verified using full-wave simulation software. For example... Figure 7 As shown, the antenna's main polarization is vertical polarization, and it has an omnidirectional radiation mode in the horizontal direction.

[0074] The above examples primarily illustrate the low-profile, miniaturized, broadband, and omnidirectional vertical polarization radiation characteristics of slot antennas. Although only some embodiments of this patent have been described, this patent is not limited to the above embodiments, and other embodiments that do not depart from its spirit and scope should be protected by this patent.

[0075] While the embodiments disclosed in this invention are as described above, they are merely illustrative of the embodiments to facilitate understanding of the invention and are not intended to limit the invention. Any person skilled in the art to which this invention pertains may make any modifications and variations in the form and details of the implementation without departing from the spirit and scope disclosed herein; however, the scope of patent protection for this invention shall still be determined by the scope defined in the appended claims.

Claims

1. A low-profile, miniaturized, broadband omnidirectional vertically polarized slot antenna, characterized in that, include: Antenna radiator, radiating feeder, metal casing and radome; The antenna radiator is a cylindrical metal radiator (2); a circular dielectric plate (1) is disposed on the top of the metal radiator (2) and in contact with it; the metal radiator (2) is in contact with the metal layer of the dielectric plate (1); a gap is provided on the cylindrical side wall of the metal radiator (2), and an omnidirectional vertical polarization radiation mode is formed by the equivalent magnetic flux radiation through the gap. A metal feed probe (3) is used as the radiation feed body, and the metal feed probe (3) includes an inner conductor and an outer conductor with a coaxial structure; The metal housing (4) is generally set as a frustum, with a frustum-shaped metal cavity inside. The top is provided with an antenna radiator assembly surface. The bottom end of the inner conductor of the metal feed probe (3) is fixedly connected to the bottom of the frustum-shaped metal housing (4). The entire antenna radiator is placed inside the metal cavity, so that the outer conductor of the metal feed probe (3) passes through the metal radiator (2) and the top end abuts against the metal layer of the dielectric plate (1). It is fixedly connected to the assembly surface of the frustum-shaped housing (4) through the dielectric plate (1) to form an antenna cover.

2. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to claim 1, characterized in that, The cylindrical metal radiator (2) has a pair of horizontal slits on its sidewall in the circumferential direction, and the position and structure of the pair of slits are symmetrically arranged so that the omnidirectional mode is formed by the slit equivalent magnetic flow, and the polarization mode is vertical polarization. The top end of the cylindrical metal radiator (2) is in contact with the metal layer of the dielectric plate (1); The bottom end of the cylindrical metal radiator (2) is fixedly connected to the bottom of the metal shell (4).

3. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to claim 2, characterized in that, The dielectric board (1) is a double-layer PCB board with copper plating on one side of the contact surface with the metal radiator (2). The metal layer is formed in the middle of the bottom surface of the dielectric board (1), and the metal layer is in contact with the top of the cylindrical slotted structure in the metal radiator (2).

4. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to claim 3, characterized in that, The contact surface between the metal layer of the dielectric plate (1) and the metal radiator (2) is provided with an annular groove structure, and the annular groove is metallized.

5. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to claim 4, characterized in that, The metal shell (4) has a concave ring structure around the top mounting surface, and the medium plate (1) is entirely covered on the concave ring structure of the mounting surface and is fixedly connected by screws.

6. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to any one of claims 1 to 5, characterized in that, In the metal feed probe (3), an RF connector is used as the inner conductor, and a cylindrical metal conductor with a diameter larger than that of the RF connector is used as the outer conductor. The metal feed probe (3) is formed by drilling holes on the bottom surface of the cylindrical metal conductor and inserting the RF connector into the cylindrical metal conductor. The top of the outer conductor in the metal feed probe (3) is in direct contact with the metal layer of the dielectric plate (1). The bottom end of the RF connector is provided with a flange and a fixing hole is provided on the flange for fixing the RF connector to the bottom center boss of the frustum-shaped metal housing (4) by screws.

7. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to any one of claims 1 to 5, characterized in that, The dielectric substrate (1) has a non-metallic annular region (7) on its metal layer for forming broadband impedance matching; and the dielectric substrate (1) has a blind groove (8) and a metallized blind hole, so that the metal feed probe (3) can penetrate into the dielectric substrate (1) to form a nested structure.

8. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to any one of claims 1 to 5, characterized in that, The edges of the metal radiator (2) and the edges of the slits on the cylindrical sidewall of the metal radiator (2) are all rounded.

9. The low-profile miniaturized broadband omnidirectional vertically polarized slot antenna according to any one of claims 1 to 5, characterized in that, The frustum-shaped metal housing (4) is formed by hollowing out a cylindrical metal. The metal housing (4) is provided with an annular skirt around its perimeter, which is used to conformally install the low-profile miniaturized broadband omnidirectional vertical polarization slot antenna with the mounting platform.

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