Ceiling antenna

Abstract

The present application provides a ceiling antenna, which comprises a plurality of first radiating elements, a base plate and a feeder line. Each radiating element comprises a feeding portion, a first side edge, a second side edge and a third side edge, wherein the first side edge is connected to a first end of the second side edge, and forms a first included angle with the second side edge, and a second end of the second side edge is connected to a first end of the third side edge, and forms a second included angle with the third side edge. A second radiating element is provided on the surface of the base plate. The feeder line is routed through the base plate; the feeder line comprises an inner conductive layer and an outer conductive layer; the inner conductive layer at a first end of the feeder line is electrically connected to each of the feeding portions of the plurality of first radiating elements; the outer conductive layer at the first end of the feeder line is electrically connected to the second radiating element; and a second end of the feeder line is used for receiving a feed signal. In the present application, a first included angle and a second included angle are set on each first radiating element to adjust the length of second side edges and the length of third side edges, so that the impedance bandwidth can be broadened while keeping the height of the first radiating elements unchanged.

Description

Ceiling antenna TECHNICAL FIELD

[0001] The present application relates to the field of mobile communication, in particular to a ceiling antenna. BACKGROUND

[0002] With the development of mobile communication technology, the application scenarios of indoor communication are increasing. Especially in densely populated cities, high-rise buildings and other buildings, the propagation loss of outdoor base station signals is extremely large, resulting in weak signal strength and poor quality of indoor mobile communication network. In the room distribution antenna, the ceiling antenna is an important means to fill the signal coverage blind area and improve the user network experience. The ceiling antenna can be applied in high-rise rooms, underground garages, shopping centers and other places to provide omnidirectional coverage of communication networks. However, due to the limitation of its use scene, the antenna needs to be designed to be small and light. SUMMARY

[0003] In order to solve the problems in the prior art, the present application provides a ceiling antenna, which realizes lightweight and increases bandwidth.

[0004] The present application provides a ceiling antenna, which comprises:

[0005] A plurality of first radiation units, the first radiation unit has a feed-in part, a first side, a second side and a third side; the first side is connected with the first end of the second side, and has a first included angle with the second side; the second end of the second side is connected with the first end of the third side, and has a second included angle with the third side; the feed-in part is connected with the second end of the third side;

[0006] A bottom plate, the surface of the bottom plate is provided with a second radiation unit;

[0007] A power supply line, the power supply line is provided in the bottom plate; the power supply line comprises an inner conductive layer and an outer conductive layer; the inner conductive layer of the first end of the power supply line is electrically connected with the feed-in part of the plurality of first radiation units, and the outer conductive layer of the first end of the power supply line is electrically connected with the second radiation unit; the second end of the power supply line is used for accessing a power supply signal.

[0008] In an embodiment, the first radiation unit is provided with a plurality of first slits close to the first side.

[0009] In an embodiment, the ceiling antenna further comprises a top patch and a coupling patch;

[0010] The top patch is mounted on the top of the first radiation unit and is parallel to the bottom plate;

[0011] The coupling patch is fixedly installed on the first radiation unit close to the top patch, the coupling patch is parallel to the top patch and has a first preset interval with the top patch.

[0012] In an embodiment, the first radiation units have a third included angle.

[0013] In an embodiment, the second radiation unit includes a first radiator and a second radiator.

[0014] The first radiator is arranged on the upper surface of the bottom plate, and the second radiator is arranged on the lower surface of the bottom plate; the first radiator is electrically connected to the second radiator.

[0015] The first radiator is provided with a plurality of second slits corresponding to the positions of the first radiation units.

[0016] In an embodiment, the first radiator is further provided with a plurality of third slits corresponding to the positions between the first radiators.

[0017] In an embodiment, the first radiator includes a first arc-shaped line and a second arc-shaped line.

[0018] The second arc-shaped line is arranged outside the first arc-shaped line and has a second preset interval with the first arc-shaped line.

[0019] The second slits are arranged outside the first arc-shaped line, and the third slits are arranged inside the first arc-shaped line.

[0020] In an embodiment, the second arc-shaped line is provided with a plurality of fourth slits corresponding to the positions of the third slits.

[0021] In an embodiment, the ceiling-mounted antenna further includes a spacer.

[0022] The spacer is arranged between the bottom plate and the first radiation units.

[0023] In an embodiment, the ceiling-mounted antenna further includes a housing.

[0024] The housing is arranged outside the first radiation units and the bottom plate, and the feed line is arranged in the housing. Advantages

[0025] The application combines multiple first radiation units to form a conical radiation unit, an inner conductive layer transmits a feed signal to the first radiation unit, a high-frequency current is mirrored by a second radiation unit, and a radiation field is superimposed to generate a vertically polarized horizontal omnidirectional radiation electromagnetic wave. By setting a first included angle and a second included angle on the first radiation unit to adjust the length of the second side and the third side, the impedance bandwidth can be expanded without changing the height of the first radiation unit, and the small size of the ceiling-mounted antenna can be retained while increasing the bandwidth. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 is a perspective view of a ceiling-mounted antenna according to an embodiment of the application.

[0027] Fig. 2 is a perspective view of a ceiling-mounted antenna according to another embodiment of the application.

[0028] Fig. 3 is a side view of a ceiling-mounted antenna according to an embodiment of the application.

[0029] Fig. 4 is a top view of a ceiling-mounted antenna according to an embodiment of the application.

[0030] Fig. 5 is a structural diagram of a bottom plate according to an embodiment of the application.

[0031] Fig. 6 is a structural diagram of a ceiling-mounted antenna according to another embodiment of the application.

[0032] Fig. 7 is a structural diagram of a ceiling-mounted antenna according to yet another embodiment of the application.

[0033] Fig. 8 is a voltage standing wave ratio of a ceiling-mounted antenna according to the application.

[0034] Fig. 9a is a horizontal plane pattern of a ceiling-mounted antenna according to the application at 806 MHz.

[0035] Fig. 9b is a vertical plane pattern of a ceiling-mounted antenna according to the application at 806 MHz.

[0036] Fig. 10a is a horizontal plane pattern of a ceiling-mounted antenna according to the application at 1710 MHz.

[0037] Fig. 10b is a vertical plane pattern of a ceiling-mounted antenna according to the application at 1710 MHz.

[0038] Fig. 11a is a horizontal plane pattern of a ceiling-mounted antenna according to the application at 2675 MHz.

[0039] Fig. 11b is a vertical plane pattern of a ceiling-mounted antenna according to the application at 2675 MHz.

[0040] Fig. 12a is a horizontal plane pattern of a ceiling-mounted antenna according to the application at 3300 MHz.

[0041] Fig. 12b is a vertical plane pattern of a ceiling-mounted antenna according to the application at 3300 MHz.

[0042] Fig. 13a is a horizontal plane pattern of the ceiling antenna of the present application at 3700MHz.

[0043] Fig. 13b is a vertical plane pattern of the ceiling antenna of the present application at 3700MHz.

[0044] Fig. 14 is a gain of the ceiling antenna of the present application.

[0045] Main component symbol explanation Ceiling antenna 100 First radiating element 110 Base plate 120 Feeding wire 130 Feeding-in portion 111 First side edge 112 Second side edge 113 Third side edge 114 First gap 115 Top patch 116 Coupling patch 117 Second radiating element 140 First radiating body 141 Second radiating body 142 Second gap 143 First arc-shaped line 141a Second arc-shaped line 141b Second predetermined interval 141c Third gap 144 Isolator 150 Shell 160 Fourth gap 145

[0046] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0047] The following description will reference the above-mentioned drawings to more fully describe the present application. Shown in the drawings are example embodiments of the present application. However, the present application can be embodied in many different forms and should not be construed as limited to the example embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art. Like reference numerals refer to like or similar components throughout.

[0048] With reference to FIGS. 1-3 and 6, the application provides a ceiling antenna 100, which comprises a plurality of first radiating elements 110, a bottom plate 120 and a feed line 130. The first radiating element 110 has a feed-in portion 111, a first side edge 112, a second side edge 113 and a third side edge 114; the first side edge 112 is connected with the first end of the second side edge 113 and has a first included angle with the second side edge 113; the second end of the second side edge 113 is connected with the first end of the third side edge 114 and has a second included angle with the third side edge 114; the feed-in portion 111 is connected with the second end of the third side edge 114. The bottom plate 120 is provided with a second radiating element 140. The feed line 130 is arranged in the bottom plate 120; the feed line 130 comprises an inner conductive layer and an outer conductive layer; the inner conductive layer of the first end of the feed line 130 is electrically connected with the feed-in portion 111 of the plurality of first radiating elements 110, the outer conductive layer of the first end of the feed line 130 is electrically connected with the second radiating element 140, and the second end of the feed line 130 is used for accessing a feed signal.

[0049] In the embodiment, the bottom plate 120 can be implemented by a dielectric substrate, and the feed line 130 can be implemented by a coaxial cable. The bottom plate 120 and the plurality of first radiating elements 110 can be respectively welded and fixed on the feed line 130. The feed line 130 is arranged in the bottom plate 120, and can also play a role of supporting and fixing in addition to transmitting the feed signal.

[0050] The feed signal is input through the feed line 130, the inner conductive layer transmits the feed signal to the first radiating element 110, the high-frequency current is mirrored through the second radiating element 140, and the radiation field is superimposed to generate vertically polarized horizontal omnidirectional radiation electromagnetic waves. The feed signal flows through the feed-in portion 111, the first side edge 112, the second side edge 113 and the third side edge 114 of the first radiating element 110 in a forward or reverse direction.

[0051] The first side edge 112 of the first radiating unit 110 can be arranged to be perpendicular to the bottom plate 120, the first included angle between the first side edge 112 and the second side edge 113 can be arranged to be an obtuse angle, and the second included angle between the third side edge 114 and the second side edge 113 can be arranged to be an obtuse angle. In this way, the length of the first side edge 112 and the second side edge 113 can be changed by adjusting the size of the first included angle and the second included angle, and the current path is adjusted, and the low frequency resonance point is changed, while the height of the first radiating unit 110 is unchanged. For example, when the height of the first radiating unit 110 and the first side edge 112 is fixed, the first included angle and / or the second included angle is reduced, the length of the second side edge 113 and / or the third side edge 114 is increased accordingly, the current path is extended accordingly, and the low frequency resonance point is reduced, and the bandwidth is increased. In addition, the first side edge 112 can also be arranged to be not perpendicular to the bottom plate 120 according to actual application. The number of the first included angle and the second included angle can be arranged to be more according to actual needs. The first included angle and the second included angle can also be arranged to be a right angle, an acute angle, etc., or in a curved form, which is not limited here.

[0052] Further, the side edges of the first radiating unit 110 can also be arranged with more included angles.

[0053] In an embodiment, the first radiating unit 110 can be implemented by using a metal material, for example, a copper sheet, an aluminum alloy, etc. Alternatively, the first radiating unit 110 can be implemented by using a double-sided copper clad dielectric substrate. The plurality of first radiating units 110 can be fixed by welding or clamped by setting a groove and a protruding structure. For example, the first radiating unit 110 is a double-sided copper clad dielectric substrate. Two first radiating units 110 can be arranged symmetrically on the same dielectric substrate, and a slot is provided in the middle connecting position of the dielectric substrate to be clamped to the middle connecting position of another dielectric substrate with the same structure. In this way, the fixation of two, four, six or more first radiating units 110 can be achieved.

[0054] In an embodiment, the plurality of first radiating units 110 have a third included angle. For example, when the number of the first radiating units 110 is four, two double-sided copper clad dielectric substrates can be cross-clamped so that the third included angle is 90°.

[0055] The present application can achieve uniform radiation in the horizontal plane by combining a plurality of first radiating units 110 to form a conical radiating unit, and mirror image symmetry to a dipole radiating electromagnetic wave through the bottom plate 120. By arranging the first included angle and the second included angle on the first radiating unit 110 to adjust the length of the second side edge 113 and the third side edge 114, the impedance bandwidth can be expanded while the height of the first radiating unit 110 is unchanged, and the small size of the ceiling-mounted antenna 100 is retained while the bandwidth is increased.

[0056] In an embodiment, the first radiation unit 110 is provided with a plurality of first slots 115 close to the first side edge 112.

[0057] In the embodiment, the plurality of first slots 115 can be arranged in sequence along the first side edge 112, or staggered. By providing the plurality of first slots 115, the current distribution of the first radiation unit 110 can be adjusted, and the current path can be extended.

[0058] In an embodiment, the ceiling antenna 100 further comprises a top patch 116 and a coupling patch 117. The top patch 116 is mounted on the top of the first radiation unit 110 and parallel to the bottom plate 120. The coupling patch 117 is fixedly mounted on the first radiation unit 110 close to the top patch 116, and the coupling patch 117 is parallel to the top patch 116 and has a first preset interval with the top patch 116.

[0059] In the embodiment, the top patch 116 can be provided with slots corresponding to the positions of the plurality of first radiation units 110, and protrusions can be provided on the top of the plurality of first radiation units 110 to cooperate with the top patch 116 for fixation. The top patch 116 and the coupling patch 117 can play a capacitive loading role, improve the in-band impedance matching, expand the low-frequency sideband, and adjust the pattern roundness. The first preset interval can be set according to the working frequency band of the ceiling antenna 100.

[0060] In an embodiment, the coupling patch 117 can be provided through the plurality of first radiation units 110. Alternatively, the coupling patch 117 can be provided in plurality, and the two ends of each coupling patch 117 are bent to be parallel to the first radiation unit 110, and the two ends of the coupling patch 117 are fixed on the first radiation units 110 on both sides by screws and nuts.

[0061] Referring to FIGS. 4 and 5, in an embodiment, the second radiation unit 140 comprises a first radiation body 141 and a second radiation body 142. The first radiation body 141 is provided on the upper surface of the bottom plate 120, and the second radiation body 142 is provided on the lower surface of the bottom plate 120; the first radiation body 141 is electrically connected to the second radiation body 142. The first radiation body 141 is provided with a plurality of second slots 143 corresponding to the positions of the plurality of first radiation units 110.

[0062] In the embodiment, the second radiator 142 can be a copper layer laid on the lower surface of the bottom plate 120. The first radiator 141 and the second radiator 142 can be electrically connected through the via. By setting the second gap 143 at the lower position of the first radiating unit 110, the interference of the lower second radiating unit 140 on the first radiating unit 110 can be reduced. In addition, the second gap 143 is set at the position close to the feed point of the second radiating unit 140, for adjusting the degree of capacitive loading.

[0063] Further, the first radiator 141 can also be provided with a plurality of third gaps 144, which are arranged at positions between the plurality of first radiators 141. The third gaps 144 are used to adjust the degree of capacitive loading.

[0064] In an embodiment, the first radiator 141 includes a first arc-shaped line 141a and a second arc-shaped line 141b. The second arc-shaped line 141b is arranged outside the first arc-shaped line 141a and has a second preset interval 141c with the first arc-shaped line 141a. The second gap 143 is arranged outside the first arc-shaped line 141a, and the third gap 144 is arranged inside the first arc-shaped line 141a. The second arc-shaped line 141b is provided with a plurality of fourth gaps 145 corresponding to the positions of the plurality of third gaps 144.

[0065] In the embodiment, the first arc-shaped line 141a is connected to the second radiator 142 through the via, which plays a role of capacitive loading at the feed point and can expand the low-frequency sideband. The second gap 143, the third gap 144, and the fourth gap 145 are used to adjust the degree of capacitive loading and reduce the influence of the first arc-shaped line 141a on the non-circularity.

[0066] The second arc-shaped line 141b is used to adjust the surface induced current distribution and reduce the non-circularity. The gap size of the third gap 144 can also be set according to the frequency of adjusting the non-circularity of the corresponding second arc-shaped line 141b. The second preset interval 141c is used to reduce the influence of the second arc-shaped line 141b on the capacitive loading effect of the first arc-shaped line 141a.

[0067] In an embodiment, the ceiling-mounted antenna 100 further includes a spacer 150. The spacer 150 is arranged between the bottom plate 120 and the plurality of first radiating units 110.

[0068] In the embodiment, the spacer 150 can be implemented by using an insulating material. By arranging the spacer 150 between the first radiating unit 110 and the bottom plate 120, the conduction between the first radiating unit 110 and the second radiating unit 140 can be effectively prevented.

[0069] Referring to FIG. 7, in an embodiment, the ceiling-mounted antenna 100 further comprises a housing 160. The housing 160 is arranged outside the first radiating elements 110 and the bottom plate 120, and the feeding line 130 passes through the housing 160.

[0070] In the embodiment, the housing 160 comprises a cover and a cover bottom plate. The cover is arranged outside the first radiating elements 110, and the cover bottom plate is arranged at the bottom of the bottom plate 120. The inner side of the cover can further be provided with a limiting structure corresponding to the positions of the first radiating elements 110, for limiting the first radiating elements 110. The cover and the cover bottom plate can be fixedly installed by respectively arranging protrusions and recesses thereon, or by screws and nuts. In this way, the ceiling-mounted antenna 100 is convenient to install in high-rise rooms, underground garages, shopping centers and other places, and plays a protective role on the internal radiating elements.

[0071] In addition, the cover bottom plate can be provided with a through hole for the feeding line 130 to pass through. Further, a threaded structure can be arranged outside the cover bottom plate, for cooperating with the nut to be installed. In this way, the nut cooperates with the thread to fix the position of the cover bottom plate, improving the stability of the ceiling-mounted antenna 100.

[0072] FIG. 8 is a voltage standing wave ratio of the ceiling-mounted antenna 100 of the present application, FIGS. 9-13 are horizontal and vertical direction diagrams of the ceiling-mounted antenna 100 of the present application in each frequency band, and FIG. 14 is a gain of the ceiling-mounted antenna 100 of the present application in each frequency band. It can be seen that the ceiling-mounted antenna 100 has good matching in the frequency range of 806-960 MHz, 1710-2700 MHz, and 3300-3700 MHz, and its non-circularity is 806: 0.02 dB; 1710: 0.13 dB; 2675: 0.54 dB; 3300: 2.25 dB; 3700: 1.95 dB, and the gain performance is also good. And it realizes less number of blades, small size, easy installation, and good structural stability.

[0073] In the above, the specific embodiments of the present application are described with reference to the accompanying drawings. However, those skilled in the art can understand that various changes and replacements can be made to the specific embodiments of the present application without departing from the spirit and scope of the present application. These changes and replacements are within the scope defined by the present application.

Claims

1. A ceiling antenna, characterized by The ceiling-mounted antenna comprises: a plurality of first radiation units, each of the first radiation units having a feeding portion, a first side, a second side and a third side, the first side being connected with a first end of the second side and having a first included angle with the second side, a second end of the second side being connected with a first end of the third side and having a second included angle with the third side, the feeding portion being connected with a second end of the third side; a bottom plate, a surface of the bottom plate being provided with a second radiation unit; a feeding line, the feeding line being arranged in the bottom plate, the feeding line comprising an inner conductive layer and an outer conductive layer, the inner conductive layer of a first end of the feeding line being electrically connected with the feeding portions of the plurality of first radiation units, the outer conductive layer of the first end of the feeding line being electrically connected with the second radiation unit, and a second end of the feeding line being used for connecting a feeding signal.

2. The ceiling-mount antenna of claim 1, wherein, Each of the first radiation units is provided with a plurality of first slits near the first side.

3. The ceiling-mount antenna of claim 2, wherein, The ceiling-mounted antenna further comprises a top patch and a coupling patch. The top patch is mounted on a top of the first radiation unit and is parallel to the bottom plate. The coupling patch is fixedly mounted on the first radiation unit near the top patch, the coupling patch being parallel to the top patch and having a first preset interval with the top patch.

4. The ceiling-mount antenna of claim 1, wherein, The plurality of first radiation units have a third included angle.

5. The ceiling-mount antenna of claim 1, wherein, The second radiation unit comprises a first radiator and a second radiator. The first radiator is arranged on an upper surface of the bottom plate, and the second radiator is arranged on a lower surface of the bottom plate, the first radiator being electrically connected with the second radiator. The first radiator is provided with a plurality of second slits corresponding to positions of the plurality of first radiation units.

6. The ceiling-mount antenna of claim 5, wherein the antenna housing is configured to be mounted to a ceiling surface by a plurality of fasteners. The first radiator is further provided with a plurality of third slits corresponding to positions between the plurality of first radiators.

7. The ceiling-mount antenna of claim 6, wherein the antenna housing is configured to be mounted to a ceiling of a room. The first radiator comprises a first arc-shaped line and a second arc-shaped line. The second arc-shaped line is arranged outside the first arc-shaped line and has a second preset interval with the first arc-shaped line. The second slits are arranged outside the first arc-shaped line, and the third slits are arranged inside the first arc-shaped line.

8. The ceiling-mount antenna of claim 7, wherein the antenna housing is configured to be mounted to a ceiling of a room. The second arc-shaped line is provided with a plurality of fourth slits corresponding to positions of the plurality of third slits.

9. The ceiling-mount antenna of claim 8, wherein the antenna housing is configured to be mounted to a ceiling of a room. The ceiling-mounted antenna further comprises a spacer. The spacer is arranged between the bottom plate and the plurality of first radiation units.

10. The ceiling-mount antenna of claim 1, wherein, The ceiling-mounted antenna further comprises a shell. The shell surrounds the first radiation units and the bottom plate, and the feeding line is arranged in the shell.

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