Elevator antenna

Abstract

The embodiment of the utility model relates to the technical field of mobile communication, and discloses an elevator antenna, which comprises an antenna housing, a first log-periodic dipole unit, a second log-periodic dipole unit, a power divider, a bottom plate and a bottom cover, the housing is used for accommodating the first log-periodic dipole unit, the second log-periodic dipole unit, the power divider and the bottom plate; the bottom plate is fixedly connected with the bottom cover, and the first log-periodic dipole unit, the second log-periodic dipole unit and the power divider are respectively mounted on one side, back to the bottom cover, of the bottom plate; and the power divider is used for feeding the first log-periodic dipole unit and the second log-periodic dipole unit respectively. Through the above mode, the broadband and narrow wave beam high gain antenna realizes broadband and narrow wave beam high gain, can satisfy broadband and high gain requirements of an elevator car scene on the antenna, and realizes accurate signal coverage.

Description

Technical Field

[0001] The embodiment of the utility model relates to the field of mobile communication technology, and in particular to an elevator antenna. Background Art

[0002] Indoor distribution systems are a successful example of mobile communications used to improve the mobile communication environment within buildings, targeting indoor users. These systems primarily consist of two components: donor signal sources from various network standards and an indoor signal distribution system. These sources include base stations, remote base station equipment, and wireless or wired relay equipment. The indoor signal distribution system comprises active and passive components, antennas, and cables. The indoor signal distribution system effectively distributes the donor signal to every corner of the room, ensuring ideal signal coverage.

[0003] With the rapid growth in demand and multi-data transmission and exchange, indoor communication signal coverage is particularly important. Buildings' shielding and absorption effects can cause significant radio wave transmission attenuation, resulting in weak, strong, and blind areas for mobile signals. Existing technologies use microcellular systems to address indoor signal coverage, improving the overall service level of mobile networks. However, elevator cabins are a special case for indoor distributed systems. Limited by the metal shielding of the cabin and interference from the elevator's operating environment, elevator cabins place high demands on antenna coverage characteristics. Commonly used directional antennas, such as logarithmic antennas, lack strong beam directionality and are large in size, making them unable to meet the new requirements of this specific scenario. Utility Model Content

[0004] In view of the problems that existing antenna beams have weak directivity and are large in size, and cannot meet the requirements of elevator car scenarios, an embodiment of the present utility model provides an elevator antenna that overcomes the above problems or at least partially solves the above problems.

[0005] According to one aspect of an embodiment of the present utility model, an elevator antenna is provided, comprising an antenna cover, a first logarithmic periodic dipole unit, a second logarithmic periodic dipole unit, a power divider, a base plate and a bottom cover, wherein the antenna cover and the bottom cover are buckled together to form an accommodating space for accommodating the first logarithmic periodic dipole unit, the second logarithmic periodic dipole unit, the power divider and the base plate; the base plate is fixedly connected to the bottom cover, the first logarithmic periodic dipole unit, the second logarithmic periodic dipole unit and the power divider are respectively installed on a side of the base plate facing away from the bottom cover; the power divider is used to feed the first logarithmic periodic dipole unit and the second logarithmic periodic dipole unit respectively.

[0006] In an optional manner, the first log-periodic dipole unit includes a first radiating element and a second radiating element, and the second log-periodic dipole unit includes a third radiating element and a fourth radiating element.

[0007] In an optional manner, the first radiating element, the second radiating element, the third radiating element and the fourth radiating element are arranged in parallel and on the same straight line.

[0008] In an optional manner, the first logarithmic periodic dipole unit includes 16 groups of first symmetric oscillators arranged in parallel, and the second logarithmic periodic dipole unit includes 16 groups of second symmetric oscillators arranged in parallel.

[0009] In an optional manner, along the bottom plate toward the radome, the length of each group of the first symmetrical dipoles decreases, and the length of each group of the second symmetrical dipoles decreases.

[0010] In an optional manner, along the bottom plate toward the radome, the spacing between two adjacent groups of the first symmetrical dipoles decreases, and the spacing between two adjacent groups of the second symmetrical dipoles decreases.

[0011] In an optional manner, along the bottom plate toward the radome, the resonant frequencies corresponding to each group of the first symmetrical vibrators increase gradually, and the resonant frequencies corresponding to each group of the second symmetrical vibrators increase gradually.

[0012] In an optional embodiment, the power divider includes an input port, a first output port and a second output port; the first output port is connected to the first logarithmic periodic dipole unit, and the second output port is connected to the second logarithmic periodic dipole unit; the input port is used to receive an input signal and distribute the input signal to the first output port and the second output port.

[0013] In an optional embodiment, the operating frequency bands of the elevator antenna are 1710-2700 MHz and 3300-3600 MHz, and the radiation gain is 9-13 dBi.

[0014] In an optional manner, the elevator antenna further includes a mounting bracket fixedly connected to the bottom cover, which is used to be fixed on the elevator to install the elevator antenna.

[0015] The embodiment of the present invention can achieve a wide bandwidth by adopting a logarithmic dipole antenna structure. Furthermore, the embodiment of the present invention forms a linear array by a first logarithmic periodic dipole unit and a second logarithmic periodic dipole unit to achieve a narrow beam and high gain, thereby meeting the wide bandwidth and high gain requirements of the elevator car scene for the antenna and achieving precise signal coverage.

[0016] Furthermore, the embodiment of the present invention realizes combining of the first logarithmic periodic dipole unit and the second logarithmic periodic dipole unit through a power divider, and performs equal amplitude and in-phase feeding.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present invention. The same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the exploded structure of an elevator antenna provided by an embodiment of the present utility model is shown;

[0020] Figure 2 1. A front view of a first logarithmic periodic dipole unit provided by an embodiment of the present utility model is shown;

[0021] Figure 3 The figure shows a schematic structural diagram of a power divider provided by an embodiment of the present utility model.

[0022] The accompanying drawings in the specific implementation manner are as follows:

[0023] First logarithmic periodic dipole unit 110, first radiating element 111, first element 1111, second radiating element 112, second element 1121, first symmetrical element 113, second logarithmic periodic dipole unit 120, first radiating element 121, second radiating element 122, power divider 130, input port 131, first output port 132, second output port 133, fixing hole 134, metal plating 135, bottom plate 140, antenna cover 210, bottom cover 220, mounting bracket 230. DETAILED DESCRIPTION

[0024] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0025] See also Figure 1 , Figure 1The following is a schematic diagram of the exploded structure of an elevator antenna provided by an embodiment of the present invention. The elevator antenna includes a radome 210, a first log-periodic dipole unit 110, a second log-periodic dipole unit 120, a power divider 130, a base plate 140, and a bottom cover 220. The radome 210 and the bottom cover 220 are fastened together to form a receiving space for accommodating the first log-periodic dipole unit 110, the second log-periodic dipole unit 120, the power divider 130, and the base plate 140, thereby achieving the packaging effect of the radome 210. The base plate 140 is fixedly connected to the bottom cover 220. The first log-periodic dipole unit 110, the second log-periodic dipole unit 120, and the power divider 130 are respectively mounted on the side of the base plate 140 facing away from the bottom cover 220. The power divider 130 is used to feed power to the first log-periodic dipole unit 110 and the second log-periodic dipole unit 120, respectively.

[0026] See also Figure 3 , Figure 3 A schematic diagram of the structure of a power divider provided in an embodiment of the present invention is shown. The power divider 130 includes an input port 131, a first output port 132, and a second output port 133. The first output port 132 is connected to the first log-periodic dipole unit 110, and the second output port 133 is connected to the second log-periodic dipole unit 120. The input port 131 is used to receive an input signal and distribute the input signal to the first output port 132 and the second output port 133. Specifically, the input signal is evenly distributed to the first output port 132 and the second output port 133. The embodiment of the present invention uses the power divider 130 to combine the first log-periodic dipole unit 110 and the second log-periodic dipole unit 120, and feed them with equal amplitude and in-phase.

[0027] In an embodiment of the present invention, the power divider 130 adopts a microstrip power divider and is manufactured and processed by a PCB circuit board. Specifically, the PCB circuit board of the power divider 130 is rectangular, and the PCB circuit board is provided with centrally symmetrical fixing holes 134. The embodiment of the present invention includes two fixing holes 134; optionally, the PCB circuit board of the power divider 130 is also designed with a grounding pad.

[0028] The power divider 130 is provided with a metal plating layer 135 , such as a copper plating layer, at the side regions close to the first output port 132 and the second output port 133 .

[0029] The first logarithmic periodic dipole unit 110 includes a first radiating oscillator 111 and a second radiating oscillator 112, and the second logarithmic periodic dipole unit 120 includes a third radiating oscillator 121 and a fourth radiating oscillator 122. In a specific embodiment of the present invention, the first logarithmic periodic dipole unit 110 includes 16 groups of first symmetric oscillators 113 arranged in parallel, and the second logarithmic periodic dipole unit 120 includes 16 groups of second symmetric oscillators arranged in parallel; wherein the first logarithmic periodic dipole unit 110 and the second logarithmic periodic dipole unit 120 have the same shape and structure. The present invention embodiment takes the first logarithmic periodic dipole unit 110 as an example, see Figure 2 , Figure 2 A main view of the first logarithmic periodic dipole unit provided by an embodiment of the present invention is shown. The first logarithmic periodic dipole unit 110 includes a first radiating element 111 and a second radiating element 112 that are symmetrically arranged. The first radiating element 111 includes 16 single-arm first elements 1111, and the second radiating element 112 includes 16 single-arm second elements 1121. The 16 first elements 1111 and the 16 second elements 1121 are symmetrically arranged to form a logarithmic dipole antenna structure, which can basically keep the antenna performance unchanged within a very wide frequency band to achieve a wide frequency band.

[0030] Along the direction from the base plate 220 toward the radome 210, the length of each group of first symmetrical dipoles 113 decreases, and the length of each group of second symmetrical dipoles decreases. Taking the first symmetrical dipole 113 as an example, the length of the first symmetrical dipole 113 is the length of the ends of the symmetrical first dipole 1111 and second dipole 1121. Along the direction from the base plate 220 toward the radome 210, the corresponding resonant frequencies of each group of first symmetrical dipoles 113 increase, and the corresponding resonant frequencies of each group of second symmetrical dipoles increase. Taking the first symmetrical dipole 113 as an example, those closer to the base plate 140 are low-frequency dipoles, while those farther from the base plate 140 are high-frequency dipoles. The high-frequency dipoles serve as guides for the low-frequency dipoles, thereby focusing the radiation pattern, improving radiation directivity, and achieving high gain performance. The length of each group of first symmetrical dipoles 113 is approximately 0.5λ1 of the resonant frequency, where λ1 is the wavelength of the resonant frequency.

[0031] In the direction from the bottom plate 220 to the antenna cover 210 , the distance between two adjacent groups of the first symmetrical vibrators 113 decreases, and the distance between two adjacent groups of the second symmetrical vibrators decreases.

[0032] The first radiating element 111, the second radiating element 112, the third radiating element 121, and the fourth radiating element 122 are arranged in parallel and on the same straight line to form a linear array. In an optional embodiment, the first radiating element 111, the second radiating element 112, the third radiating element 121, and the fourth radiating element 122 are fixed to the side of the bottom plate 140 facing away from the bottom cover 220 and form an integrated structure with the bottom plate 140.

[0033] The bottom plate 140 is used to reflect antenna signals. Specifically, the bottom plate 140 can be made of aluminum.

[0034] Among them, the spacing between the first logarithmic periodic dipole unit 110 and the second logarithmic periodic dipole unit 120 is 0.5λ2, where λ2 is the wavelength corresponding to the high-frequency resonant frequency of the elevator antenna and is specifically set by those skilled in the art according to the actual situation of the elevator antenna.

[0035] The embodiment of the present invention uses two logarithmic units, a first logarithmic periodic dipole unit 110 and a second logarithmic periodic dipole unit 120, to form a linear array, thereby achieving the antenna's specific required beam radiation angle and narrow beam high gain. At the same time, it can also reduce the size of the elevator antenna, thereby reducing the antenna cross-sectional size and thereby reducing costs, and has a good competitive advantage.

[0036] In the embodiment of the present invention, the elevator antenna operates in two frequency bands: 1710-2700 MHz and 3300-3600 MHz, achieving a radiation gain of 9-13 dBi, meeting the requirements of 4G and 5G mobile communications. It is understood that the embodiment of the present invention can employ any combination of log-periodic dipole elements of different frequency bands to adjust the operating frequency band and radiation gain of the elevator antenna. In a specific embodiment, the elevator antenna has an operating frequency band of 1710-1850MHz, 1880-1915MHz, 2010-2025MHz, 2320-2370MHz, 2515-2690MHz and 3300-3600MHz, and the corresponding vertical half-power beamwidth is ≥60°, ≥60°, ≥60°, ≥60°, ≥55°, and ≥35° respectively; the horizontal half-power beamwidth is ≥40°, ≥40°, ≥40°, ≥35°, ≥35°, and ≥30° respectively; the gain is ≥9dBi, ≥9dBi, ≥9dBi, ≥10dBi, ≥12dBi, and ≥13dBi respectively; the standing wave is ≤1.4, the front-to-back ratio is ≥20, the third-order intermodulation is ≤-107dBm@2*43dBm, the polarization direction is vertical, and the power capacity is ≥100W.

[0037] In an optional manner, the elevator antenna also includes a mounting bracket 230 fixedly connected to the bottom cover 220. The mounting bracket 230 is used to be fixed to equipment such as an elevator to install the elevator antenna. The embodiment of the present utility model does not limit the specific shape and structure of the mounting bracket 230.

[0038] The embodiment of the present invention fixes the elevator antenna on equipment such as an elevator through the mounting bracket 230, which can maintain the stability of the elevator antenna structure and meet the installation requirements of the elevator car scene.

[0039] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present invention should have the common meanings understood by those skilled in the art to which the embodiments of the present invention belong.

[0040] In the description of the embodiments of the present invention, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present invention.

[0041] In addition, the technical terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly indicate the number of the technical features indicated. In the description of the embodiments of the present invention, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0042] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0043] In the description of this embodiment, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and description of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. An elevator antenna, characterized in that: The elevator antenna includes a radome, a first logarithmic periodic dipole unit, a second logarithmic periodic dipole unit, a power divider, a bottom plate, and a bottom cover. The radome and the bottom cover are buckled together to form an accommodating space for accommodating the first logarithmic periodic dipole unit, the second logarithmic periodic dipole unit, the power divider, and the bottom plate. The bottom plate is fixedly connected to the bottom cover, and the first logarithmic periodic dipole unit, the second logarithmic periodic dipole unit and the power divider are respectively installed on a side of the bottom plate facing away from the bottom cover; The power divider is used to feed power to the first log-periodic dipole unit and the second log-periodic dipole unit respectively.

2. The elevator antenna according to claim 1, characterized in that The first logarithmic periodic dipole unit includes a first radiating element and a second radiating element, and the second logarithmic periodic dipole unit includes a third radiating element and a fourth radiating element.

3. The elevator antenna according to claim 2, characterized in that The first radiating element, the second radiating element, the third radiating element and the fourth radiating element are arranged in parallel and on the same straight line.

4. The elevator antenna according to claim 3, characterized in that: The first logarithmic periodic dipole unit includes 16 groups of first symmetrical oscillators arranged in parallel, and the second logarithmic periodic dipole unit includes 16 groups of second symmetrical oscillators arranged in parallel.

5. The elevator antenna according to claim 4, characterized in that: Along the bottom plate toward the radome, the length of each group of the first symmetrical dipoles decreases gradually, and the length of each group of the second symmetrical dipoles decreases gradually.

6. The elevator antenna according to claim 4, characterized in that: Along the bottom plate toward the radome, the distance between two adjacent groups of the first symmetrical dipoles decreases, and the distance between two adjacent groups of the second symmetrical dipoles decreases.

7. The elevator antenna according to claim 4, characterized in that: Along the bottom plate toward the radome, the resonant frequencies corresponding to each group of the first symmetrical vibrators increase gradually, and the resonant frequencies corresponding to each group of the second symmetrical vibrators increase gradually.

8. The elevator antenna according to any one of claims 1 to 7, characterized in that: The power divider includes an input port, a first output port and a second output port; The first output port is connected to the first logarithmic periodic dipole unit, and the second output port is connected to the second logarithmic periodic dipole unit; the input port is used to receive an input signal and distribute the input signal to the first output port and the second output port.

9. The elevator antenna according to any one of claims 1 to 7, characterized in that: The elevator antenna operates in the frequency bands of 1710-2700 MHz and 3300-3600 MHz, and has a radiation gain of 9-13 dBi.

10. The elevator antenna according to any one of claims 1 to 7, characterized in that: The elevator antenna also includes a mounting bracket fixedly connected to the bottom cover and used for being fixed on the elevator to install the elevator antenna.

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