Dual-band ceiling antenna

Abstract

This invention proposes a dual-band ceiling-mounted antenna, comprising a substrate, two dipole radiators, two ground radiators, and a feeding assembly. The two dipole radiators are arranged opposite each other on the substrate, each with a feed point. The two ground radiators are also arranged opposite each other on the substrate, staggered with the dipole radiators, and electrically connected to their corresponding dipole radiators on the same side. The feeding assembly is mounted on the substrate and has an output terminal and a ground terminal. The output terminal of the feeding assembly is electrically connected to the feed points of the two dipole radiators, and the ground terminal is electrically connected to the two ground radiators for signal transmission. This antenna, with its two dipoles arranged opposite each other, can operate effectively in two different frequency ranges. Combined with the ground radiators and the feeding assembly, the antenna can simultaneously meet communication requirements in two different frequency bands, achieving efficient communication coverage in indoor spaces.

Description

Technical Field

[0001] This utility model relates to the field of communication antenna technology, and in particular to a dual-band ceiling antenna. Background Technology

[0002] With the rapid development of wireless communication technology, people have increasingly higher requirements for the quality of indoor communication signals. Ceiling antennas, as a commonly used antenna type in indoor distribution systems, are widely used in shopping malls, office buildings, hotels, residential communities, and other places. In practical applications, antennas often need to cover multiple frequency bands to meet the needs of different communication systems.

[0003] A combined antenna, disclosed in CN104183919B, comprises, from top to bottom, a first-layer microstrip antenna, a second-layer microstrip antenna, a third-layer microstrip antenna, and a circuit board; the centers of the first-layer microstrip antenna, the second-layer microstrip antenna, the third-layer microstrip antenna, and the circuit board coincide; each corner of the side of the third-layer microstrip antenna is provided with an isolating plate that matches its shape, used to improve the isolation between the second-layer microstrip antenna and the third-layer microstrip antenna; wherein, the isolating plate is used to reduce the dielectric constant of the dielectric layer of the third-layer microstrip antenna.

[0004] Traditional ceiling antennas have many problems. Many traditional ceiling antennas operate on a single frequency band and cannot meet the needs of multiple communication systems at the same time. When multi-frequency communication is required, multiple antennas of different frequency bands need to be installed, which not only increases installation costs and space occupation, but also makes system wiring and maintenance more complicated. In addition, traditional ceiling antennas have poor radiation efficiency and are difficult to achieve good signal coverage. Utility Model Content

[0005] In view of this, this utility model proposes a dual-band ceiling antenna. By setting two vibrators relative to each other, it can be used to work effectively in two different frequency ranges. In conjunction with the ground radiator and the feeding component, the antenna can simultaneously meet the communication needs in two different frequency bands, achieving efficient communication coverage in indoor spaces.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a dual-band ceiling-mounted antenna, including a substrate, two dipole radiators, two ground radiators, and a feeding assembly, wherein...

[0007] Two oscillator radiators are arranged opposite each other on the substrate, and each oscillator radiator is provided with a feed point for transmitting and receiving radiated electromagnetic waves.

[0008] Two ground radiators are arranged opposite each other on the substrate and are staggered with the oscillator radiators. The ground radiators are electrically connected to the corresponding oscillator radiators on the same side to form a reflective surface and a reference ground.

[0009] The power supply assembly is mounted on the substrate and has an output terminal and a ground terminal. The output terminal of the power supply assembly is electrically connected to the feed points of the two oscillator radiators, and the ground terminal of the power supply assembly is electrically connected to the two ground radiators for signal transmission.

[0010] Based on the above technical solutions, preferably, the oscillator radiator includes several corrugated segments and connecting segments. The several corrugated segments radiate outward from the center of the substrate and are centered on the center of the substrate. The curvature of each corrugated segment is equal and they are arranged at equal intervals. Each connecting segment is fixedly connected between two adjacent corrugated segments. The several corrugated segments and connecting segments are an integral structure.

[0011] Based on the above technical solutions, preferably, the width of both the corrugated segment and the connecting segment is 4~6mm, and the straight-line distance between two adjacent corrugated segments is 4~6mm.

[0012] Based on the above technical solutions, preferably, the width of the corrugated segment and the connecting segment, as well as the straight-line distance between two adjacent corrugated segments, are equal.

[0013] Based on the above technical solutions, preferably, the ground radiator is formed in a fan shape, and the endpoint of the ground radiator is fixedly connected to the corrugated segment of the adjacent oscillator radiator on the same side near the center point of the substrate.

[0014] Based on the above technical solutions, preferably, the arc shape of the ground radiator is the same as the arc shape of the corrugated section, and the two oscillator radiators and the two ground radiators are arranged in a rotational symmetry with the center point of the substrate as the center.

[0015] Based on the above technical solutions, preferably, the power supply assembly includes a coaxial input cable, a vibrator connector, two grounding connectors, and a microstrip feeder, wherein,

[0016] The coaxial input cable is located at the center of the substrate and extends through the substrate to one side of the oscillator radiator. The coaxial input cable has a signal transmission end and a ground end.

[0017] The two ends of the vibrator connector are welded and fixed to the feed points of the two vibrator radiators, respectively. One end of the microstrip feeder is welded and fixed to the transmission end of the coaxial input cable, and the other end is welded and fixed to the center of the vibrator connector.

[0018] One end of each of the two grounding connectors is welded and fixed to the grounding end of the coaxial input cable, and the other end of each of the two grounding connectors is welded and fixed to the end of the ground radiator.

[0019] Based on the above technical solutions, preferably, the oscillator connector and the two grounding connectors are arranged at different heights, and the oscillator connector is located on the side of the grounding connector that is away from the substrate.

[0020] Based on the above technical solutions, preferably, it also includes a housing, which is circular and disposed on the side of the substrate near the oscillator radiator, for encapsulating the substrate, two oscillator radiators, two ground radiators and power supply components inside.

[0021] Based on the above technical solutions, preferably, the substrate is a high-frequency PCB board with a thickness of 1mm and a dielectric constant of 3.5.

[0022] The dual-band ceiling-mounted antenna of this invention has the following advantages over the prior art:

[0023] (1) By setting two oscillators relative to each other, it can be used to work effectively in two different frequency ranges. The ground radiator serves as a reflector to enhance the radiation intensity in a specific direction, improve the directivity and gain of the antenna, and provide a stable reference potential. The feed assembly connects the antenna to the external circuit to ensure accurate signal transmission, so that the antenna can simultaneously meet the needs of different communication systems in the dual frequency band.

[0024] (2) By radiating outwards from the center of the substrate with equal arc and equal spacing, the oscillator radiator can better control the propagation direction of the radiated wave when radiating electromagnetic waves, reduce the radiation loss to other directions, thereby improving the radiation efficiency and enabling the signal to be transmitted to the target area more concentratedly.

[0025] (3) By encapsulating the substrate, two oscillator radiators, two ground radiators and the feeding assembly inside, and with the outer shell in a circular shape, the internal components are protected and the antenna structure is compact, occupying little space, which is conducive to installation and deployment in indoor environments with limited space, so as to adapt to different indoor installation environments. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the dual-band ceiling-mounted antenna of this utility model;

[0028] Figure 2 This is a cross-sectional view of the dual-band ceiling antenna of this utility model;

[0029] Figure 3 This is a schematic diagram showing the connection between the feed assembly, the vibrator radiator, and the feed assembly of the dual-band ceiling antenna of this utility model. Detailed Implementation

[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0031] like Figure 1-3 As shown, a dual-band ceiling-mounted antenna of this utility model includes a substrate 1, two dipole radiators 2, two ground radiators 3, and a feeding assembly 4. The two dipole radiators 2 are arranged opposite each other on the substrate 1, and each dipole radiator 2 is provided with a feed point for transmitting and receiving radiated electromagnetic waves. The two ground radiators 3 are arranged opposite each other on the substrate 1, and are staggered with the dipole radiators 2. The ground radiators 3 are electrically connected to the dipole radiators 2 on the same side to form a reflector and a reference ground. The feeding assembly 4 is disposed on the substrate 1 and has an output terminal and a ground terminal. The output terminal of the feeding assembly 4 is electrically connected to the feed points of the two dipole radiators 2, and the ground terminal of the feeding assembly 4 is electrically connected to the two ground radiators 3 for signal transmission.

[0032] It should be noted that the dipole radiator 2 is the core component of the antenna for radiating and receiving electromagnetic waves. When the feed assembly 4 inputs alternating current to the feed point of the dipole radiator 2, according to Maxwell's electromagnetic theory, the alternating current will induce changing electric and magnetic fields around the dipole, thereby forming electromagnetic waves and radiating them outward. When electromagnetic waves in space irradiate the dipole radiator 2, an alternating current will be induced on the dipole, and the signal will be transmitted to the feed assembly 4 through the feed point, realizing the reception of electromagnetic waves. By having two dipole radiators 2 arranged opposite each other on the substrate 1, they can generate effective radiation and reception in two different frequency ranges. The two dipole radiators 2 can cover indoor coverage of 350-370M and 800-870M dual-band antennas. The ground radiator is arranged alternately with the dipole radiator 2 and electrically connected. The ground radiator can act as a reflector. When the radiated electromagnetic waves encounter the ground radiator 2, they are reflected according to the law of reflection. This allows the reflected waves to superimpose with the direct radiated waves in a specific direction, enhancing the radiation intensity in that direction and improving the antenna's directivity and gain. In the circuit, the ground radiator 3 provides a stable reference potential for the entire antenna system, ensuring normal current flow and stable signal transmission. Simultaneously, the presence of the reference ground also helps stabilize the antenna's performance and reduce the impact of external interference. The feed assembly 4 connects the antenna to the external circuit. Its output terminal is electrically connected to the feed points of the two dipole radiators 2, transmitting the signal generated by the external circuit to the dipole radiators 2, causing them to radiate. It also transmits the signal received by the dipole radiators 2 to the external circuit for processing. The grounding terminal is electrically connected to the two ground radiators 3 respectively, providing a reference potential for the signal and ensuring the accuracy and stability of signal transmission.

[0033] It should be noted that this dual-band ceiling antenna can operate simultaneously in two different frequency bands to meet the needs of different communication systems. Furthermore, the ceiling-mounted design makes the antenna structure compact, occupies little space, and is easy to install and deploy in indoor environments with limited space.

[0034] The oscillator radiator 2 in this embodiment includes several corrugated segments 21 and connecting segments 22. The corrugated segments 21 radiate outward from the center of the substrate 1, with the center of the substrate 1 as the center. The curvature of each corrugated segment 21 is equal and they are arranged at equal intervals. Each connecting segment 22 is fixedly connected between two adjacent corrugated segments 21. The corrugated segments 21 and connecting segments 22 are an integral structure.

[0035] It should be noted that the structure of the radiator 2, which consists of several corrugated segments 21 and connecting segments 22, can extend the working frequency band of the antenna by adjusting the parameters of the corrugated segments 21. It can provide good impedance matching in two different frequency bands, so that the antenna can effectively radiate and receive electromagnetic waves in both frequency bands, meeting the requirements of modern communication systems for multi-band compatibility and wideband operation. Since the corrugated segments 21 are arranged outward from the center of the substrate 1 with equal arc and equal spacing, the radiator 2 can better control the propagation direction of the radiated waves when radiating electromagnetic waves, reduce radiation loss in other directions, thereby improving the directivity of the antenna and enabling the signal to be transmitted to the target area more concentratedly.

[0036] In this embodiment, the width of both the corrugated segment 21 and the connecting segment 22 is 4~6mm, and the straight-line distance between two adjacent corrugated segments 21 is 4~6mm.

[0037] Specifically, in this embodiment, the width of both the corrugated segment 21 and the connecting segment 22 is 5mm, and the straight-line distance between two adjacent corrugated segments 21 is 5mm.

[0038] It should be noted that the design of 5mm width for the corrugated segments and connecting segments, as well as 5mm spacing between adjacent corrugated segments, enables the antenna to achieve good impedance matching in the dual-band. Good impedance matching can reduce signal reflection between the antenna and the feeding system, and improve signal transmission efficiency. By optimizing the width of the corrugated segments and connecting segments, as well as the spacing between adjacent corrugated segments, the antenna can concentrate more electromagnetic energy to radiate in a specific direction, thereby improving the antenna gain. Furthermore, the width of the corrugated segment 21 and the connecting segment 22, as well as the straight-line distance between two adjacent corrugated segments 21, are equal.

[0039] In this embodiment, the ground radiator 3 is formed in a fan shape, and the endpoint of the ground radiator 3 is fixedly connected to the corrugated segment 21 of the adjacent oscillator radiator 2 on the same side near the center point of the substrate 1.

[0040] It should be noted that the ground radiator 3 has a fan-shaped design. Its unique shape can effectively expand the ground radiation area, enhance the electromagnetic coupling with the surrounding space, and optimize the electromagnetic field distribution of the antenna. By fixing its endpoint to the corrugated section 21 of the adjacent dipole radiator 2 near the center point of the substrate 1, the ground radiator and the dipole radiator can form a tight electrical connection, achieve good current conduction, and allow the two to work together in the electromagnetic radiation process to adjust the impedance characteristics of the antenna to adapt to the dual-band operation requirements. This ensures efficient electromagnetic energy conversion within a specific frequency band, enhances the antenna's radiation efficiency, and enables more effective signal transmission and reception, thereby expanding the communication coverage.

[0041] In this embodiment, the arc shape of the ground radiator 3 is the same as that of the corrugated segment 21, and the two oscillator radiators 2 and the two ground radiators 3 are arranged in a 180° rotational symmetry with the center point of the substrate 1 as the center.

[0042] It should be noted that the arc shape of the ground radiator 3 is the same as that of the corrugated segment 21, which makes them have similar variation patterns in electromagnetic field distribution, enhances electromagnetic coupling, optimizes the overall electromagnetic characteristics of the antenna, and facilitates efficient radiation and reception in dual frequency bands. The two vibrator radiators 2 and the two ground radiators 3 are arranged in a 180° rotational symmetry with the center point of the substrate 1 as the center, which ensures that the current is evenly distributed in the antenna, makes the electromagnetic characteristics of the antenna consistent in different directions, reduces electromagnetic interference and energy loss caused by structural asymmetry, and improves radiation efficiency.

[0043] The power supply assembly 4 in this embodiment includes a coaxial input cable 41, a vibrator connector 42, two grounding connectors 43, and a microstrip feeder 44. The coaxial input cable 41 is located at the center of the substrate 1 and extends through the substrate 1 to one side of the vibrator radiator 2. The coaxial input cable 41 has a signal transmission end and a grounding end. The two ends of the vibrator connector 42 are welded and fixed to the power supply points of the two vibrator radiators 2, respectively. One end of the microstrip feeder 44 is welded and fixed to the transmission end of the coaxial input cable 41, and the other end is welded and fixed to the center of the vibrator connector 42. One end of each of the two grounding connectors 43 is welded and fixed to the grounding end of the coaxial input cable 41, and the other end of each of the two grounding connectors 43 is welded and fixed to the endpoint of the ground radiator 3, respectively.

[0044] It should be noted that the feeding component 4 introduces the signal through the coaxial input cable 41, and its signal transmission end is connected to the vibrator connector 42 via the microstrip feed line 44, thereby feeding the two vibrator radiators 2 and exciting the vibrator radiators 2 to generate electromagnetic waves; the grounding end is connected to the endpoint of the ground radiator 3 through two grounding connectors 43 respectively, forming a complete current loop to ensure stable electromagnetic radiation; the welding and fixing of each component ensures the stability of the signal transmission path, realizing efficient signal transmission and electromagnetic energy conversion to adapt to dual-band operation; making the antenna signal transmission loss low and efficiency high, and able to stably excite dual-band electromagnetic radiation; the structural connection is solid, improving the overall reliability and stability of the antenna, reducing performance fluctuations caused by poor contact, and ensuring that the antenna works stably and reliably in various environments.

[0045] In this embodiment, the oscillator connector 42 and the two grounding connectors 43 are arranged at different heights, and the oscillator connector 42 is located on the side of the grounding connector 43 away from the substrate 1.

[0046] This embodiment also includes a housing 5, which is circular and is disposed on the side of the substrate 1 near the oscillator radiator 2, for encapsulating the substrate 1, the two oscillator radiators 2, the two ground radiators 3 and the power supply assembly 4 inside.

[0047] It should be noted that the outer casing 5 is made of insulating, flame-retardant and strong plastic material, such as PC or ABS plastic, to encapsulate the substrate 1, two oscillator radiators 2, two ground radiators 3 and power supply assembly 4 inside, which serves to protect the internal components and improve the appearance; the outer casing 5 is circular to adapt to different indoor installation environments.

[0048] In this embodiment, substrate 1 is a high-frequency PCB board with a thickness of 1 mm and a dielectric constant of 3.5.

[0049] It should be noted that a high-frequency PCB board is selected as substrate 1 because it has specific electrical and mechanical properties and can be adapted to the high-frequency characteristics of the antenna operation. For example, FR-4 or Rogers boards can be used as carriers and support structures for various antenna components, thereby improving communication quality and overall system performance.

[0050] Working principle:

[0051] When the dual-band ceiling antenna is working, the external circuit signal is transmitted through the signal transmission end of the coaxial input cable 41, and then transmitted to the vibrator connector 42 through the microstrip feeder 44, which then distributes the signal to the feed points of the two vibrator radiators 2.

[0052] After receiving alternating current, the oscillator radiator 2 excites the surrounding electric and magnetic fields according to Maxwell's electromagnetic theory, forming electromagnetic waves that radiate outwards. Its special corrugated section 21 and connecting section 22 structure can extend the operating frequency band and control the radiation direction.

[0053] The grounding end of the coaxial input cable 41 is connected to the ground radiator 3 via two grounding connectors 43. The ground radiator 3 is fan-shaped and specifically connected to the vibrator radiator 2. It serves as a reflector to enhance the radiation intensity in a specific direction and provides a stable reference potential. When spatial electromagnetic waves irradiate the vibrator radiator 2, an alternating current is induced and transmitted back to the external circuit through the feed point and feed assembly 4. This enables the antenna to transmit and receive signals efficiently in the dual frequency bands of 350-370M and 800-870M, meeting the needs of different communication systems.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-band ceiling-mounted antenna, characterized in that, It includes a substrate (1), two oscillator radiators (2), two ground radiators (3), and a power supply assembly (4), wherein, Two oscillator radiators (2) are arranged opposite to each other on the substrate (1), and each of the two oscillator radiators (2) is provided with a feed point for transmitting and receiving radiated electromagnetic waves; Two ground radiators (3) are arranged opposite to each other on the substrate (1) and are staggered with the oscillator radiator (2). The ground radiators (3) are electrically connected to the corresponding oscillator radiators (2) on the same side to form a reflective surface and a reference ground. The power supply component (4) is disposed on the substrate (1) and has an output terminal and a ground terminal. The output terminal of the power supply component (4) is electrically connected to the power supply points of the two oscillator radiators (2) respectively, and the ground terminal of the power supply component (4) is electrically connected to the two ground radiators (3) respectively for signal transmission.

2. The dual-band ceiling-mounted antenna as described in claim 1, characterized in that: The oscillator radiator (2) includes several corrugated segments (21) and connecting segments (22). The several corrugated segments (21) radiate outward from the center of the substrate (1) and are centered on the center of the substrate (1). The corrugated segments (21) have equal curvature and are arranged at equal intervals. Each connecting segment (22) is fixedly connected between two adjacent corrugated segments (21). The several corrugated segments (21) and connecting segments (22) are an integral structure.

3. The dual-band ceiling-mounted antenna as described in claim 2, characterized in that: The width of both the corrugated section (21) and the connecting section (22) is 4~6mm, and the straight-line distance between two adjacent corrugated sections (21) is 4~6mm.

4. The dual-band ceiling-mounted antenna as described in claim 3, characterized in that: The widths of the corrugated segment (21) and the connecting segment (22) and the straight-line distance between two adjacent corrugated segments (21) are equal.

5. The dual-band ceiling-mounted antenna as described in claim 2, characterized in that: The ground radiator (3) is formed in a fan shape, and the endpoint of the ground radiator (3) is fixedly connected to the corrugated segment (21) of the adjacent oscillator radiator (2) on the same side near the center point of the substrate (1).

6. The dual-band ceiling-mounted antenna as described in claim 5, characterized in that: The arc shape of the ground radiator (3) is the same as that of the corrugated section (21), and the two oscillator radiators (2) and the two ground radiators (3) are arranged in a 180° rotational symmetry with the center point of the substrate (1) as the center.

7. The dual-band ceiling-mounted antenna as described in claim 1, characterized in that: The power supply assembly (4) includes a coaxial input cable (41), a vibrator connector (42), two grounding connectors (43), and a microstrip feeder (44), wherein, A coaxial input cable (41) is disposed at the center of the substrate (1) and extends through the substrate (1) to one side of the oscillator radiator (2). The coaxial input cable (41) has a signal transmission end and a ground end. The two ends of the oscillator connector (42) are welded and fixed to the feed points of the two oscillator radiators (2), and one end of the microstrip feeder (44) is welded and fixed to the transmission end of the coaxial input cable (41), and the other end is welded and fixed to the center of the oscillator connector (42). One end of each of the two ground connectors (43) is welded and fixed to the grounding end of the coaxial input cable (41), and the other end of each of the two ground connectors (43) is welded and fixed to the end of the ground radiator (3).

8. The dual-band ceiling-mounted antenna as described in claim 7, characterized in that: The oscillator connector (42) is arranged at a different height than the two ground connectors (43), with the oscillator connector (42) located on the side of the ground connector (43) away from the substrate (1).

9. The dual-band ceiling-mounted antenna as described in claim 1, characterized in that: It also includes a housing (5), which is circular and is disposed on the side of the substrate (1) near the oscillator radiator (2) for encapsulating the substrate (1), two oscillator radiators (2), two ground radiators (3) and power supply assembly (4) inside.

10. The dual-band ceiling-mounted antenna as described in claim 1, characterized in that: The substrate (1) is a high-frequency PCB board with a thickness of 1 mm and a dielectric constant of 3.5.

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