Omnidirectional ceiling antenna structure with low third-order intermodulation

Abstract

The utility model discloses an omnidirectional ceiling antenna structure with low third order intermodulation, and belongs to the field of antennas. According to the utility model, the connecting assembly is added to the lower conical oscillator and the upper conical oscillator, and the fixing support is used for supporting and clamping the upper conical oscillator, so that the installation stability of the upper conical oscillator is maintained, and the phenomenon that the welding part of the coaxial cable and the upper conical oscillator is cracked due to shaking of the upper conical oscillator is avoided; third-order intermodulation data can be effectively reduced, and the stability of signal transmission is ensured; the assembly structure of the convex ring and the lower conical oscillator can increase the connection stability of the fixing support and the lower conical oscillator, and the convex ring can also block the circumferential contact between the outer conductor welding seat and the first mounting hole. The problem of third-order intermodulation caused by poor non-linear contact due to electrical conduction can be effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the field of antennas, and particularly relates to an omnidirectional ceiling antenna structure with low third-order intermodulation. Background Art

[0002] The omnidirectional ceiling antenna is one of the most important and widely used antennas in the indoor distribution coverage of mobile communication networks. During the application of the omnidirectional ceiling antenna, the influence of third-order intermodulation (PIM) needs to be considered. Third-order intermodulation is a parasitic signal generated when two signals in a linear system produce a beat (mixing) between the second harmonic of one signal and the fundamental wave of the other signal due to the existence of non-linear factors. The PIM interference signal generated by the antenna will enter the signal receiving channel, increasing the noise in the signal receiving channel and reducing the quality of the wireless communication system. To reduce this interference and improve the network coverage quality, reducing the third-order intermodulation value of the antenna is an important consideration in antenna design. There are many factors affecting the third-order intermodulation of the antenna, including the material selection of components, the surface treatment process, the connection process, the assembly process, etc.

[0003] In the prior art, the components in the omnidirectional ceiling antenna are generally directly connected by bolts, which is prone to non-linear poor contact, thus causing the problem of third-order intermodulation.

[0004] Therefore, it is necessary to provide an omnidirectional ceiling antenna structure with low third-order intermodulation to solve the above problems. Summary of the Utility Model

[0005] Aiming at the above defects of the prior art, the utility model provides an omnidirectional ceiling antenna structure with low third-order intermodulation, which optimizes the connection mode between components, significantly reduces the third-order intermodulation index of the antenna, and improves the effective signal coverage quality of the indoor communication network.

[0006] To solve the above problems, the technical solution of the utility model lies in:

[0007] An omnidirectional ceiling antenna structure with low third-order intermodulation, comprising an oscillator assembly, a connection assembly and a feeding assembly. The oscillator assembly includes a lower conical oscillator and an upper conical oscillator. The upper conical oscillator is connected to the lower conical oscillator through the connection assembly. The connection assembly includes a fixing bracket. The bottom of the fixing bracket is connected to the lower conical oscillator, and the top supports the upper conical oscillator. The fixing bracket includes a base, a convex ring, a clamping strip, a clamping hook and a support strip. The base is a circular ring structure, and a through hole is provided at its central position. The convex ring is arranged on the bottom surface of the base and surrounds the edge of the through hole. The clamping strip extends radially outward from the outer wall of the convex ring. A first installation hole is provided through the top of the lower conical oscillator, and a clamping groove is formed by the inner wall of the first installation hole recessing away from the axis. The base is carried on the top of the lower conical oscillator, the convex ring is installed in the first installation hole, and the clamping strip is clamped in the clamping groove; the clamping hook and the support strip are both arranged on the top surface of the base. A second installation hole is provided through the conical part of the upper conical oscillator corresponding to the position of the clamping hook, and the top of the clamping hook passes through the second installation hole and abuts against the inner surface of the conical part of the upper conical oscillator; the support strip abuts against the outer surface of the conical part of the upper conical oscillator. The feeding assembly is connected to the oscillator assembly for transmitting signals.

[0008] As an improvement, the shape of the first installation hole matches the shape of the convex ring, and the shape of the clamping groove matches the shape of the clamping strip.

[0009] As an improvement, a plurality of the clamping strips are distributed in a circular array along the axis of the convex ring, and the clamping grooves are arranged in one-to-one correspondence with the clamping strips.

[0010] As an improvement, a plurality of the clamping hooks are distributed in a circular array along the axis of the base, and a plurality of the support strips are distributed in a circular array along the axis of the base.

[0011] As an improvement, the clamping hook includes a hook body and a wedge-shaped block arranged at the top of the hook body. The wedge-shaped block protrudes towards the inner side of the hook body. The hook body passes through the second installation hole, and the wedge-shaped block abuts against the inner surface of the conical part of the upper conical oscillator; the support strip includes a connecting part and a supporting part extending obliquely outward away from the axis of the base from the top of the connecting part. The bottom of the connecting part is fixed to the base, and the supporting part abuts against the outer surface of the conical part of the upper conical oscillator.

[0012] As an improvement, an elastic part is arranged on the surface of the supporting part close to the upper conical oscillator. The elastic part is made of an elastic material, and the elastic part is in interference connection with the upper conical oscillator.

[0013] As an improvement, the base, the convex ring, the clamping strip, the clamping hook and the supporting strip are integrally formed.

[0014] As an improvement, the connecting component further includes an outer conductor welding seat, a plastic nut and a high-temperature resistant insulating gasket. The outer conductor welding seat is installed on the first mounting hole. The outer conductor welding seat includes a seat body and a screw rod. The seat body is located below the lower conical oscillator and abuts against the convex ring. The screw rod passes through the hollow area of the convex ring and is exposed. The plastic nut is threadedly connected with the screw rod. The plastic nut is located above the base. The plastic nut and the seat body cooperate to clamp the lower conical oscillator and the convex ring. The high-temperature resistant insulating gasket is clamped between the plastic nut and the upper conical oscillator.

[0015] As an improvement, the feeding component includes a coaxial cable and a coaxial connector. The outer conductor welding seat and the high-temperature resistant insulating gasket are both of hollow structures. The coaxial cable passes through the hollow areas of the outer conductor welding seat and the high-temperature resistant insulating gasket and is connected to the upper conical oscillator. The coaxial connector is arranged at one end of the coaxial cable away from the high-temperature resistant insulating gasket for connecting the coaxial cable with an external device.

[0016] As an improvement, the structure of the omnidirectional ceiling antenna with low third-order intermodulation is a single-polarization omnidirectional ceiling antenna or a dual-polarization omnidirectional ceiling antenna structure.

[0017] The beneficial effects of the present utility model are as follows:

[0018] In the present utility model, the connecting component is added between the lower conical oscillator and the upper conical oscillator. The fixing bracket is used to support and clamp the upper conical oscillator, maintaining the installation stability of the upper conical oscillator, avoiding cracking at the welding joint between the coaxial cable and the upper conical oscillator caused by the shaking of the upper conical oscillator, and effectively reducing the third-order intermodulation data to ensure the stability of signal transmission. The assembly structure of the convex ring and the lower conical oscillator can increase the connection stability between the fixing bracket and the lower conical oscillator. Moreover, the convex ring can also block the circumferential contact between the outer conductor welding seat and the first mounting hole, effectively avoiding the third-order intermodulation problem caused by non-linear contact failure due to electrical conduction. Description of the Drawings

[0019] Figure 1 is a three-dimensional structure diagram of an omnidirectional ceiling antenna structure with low third-order intermodulation provided by the present utility model;

[0020] Figure 2 is Figure 1 a disassembled structure diagram of the omnidirectional ceiling antenna structure with low third-order intermodulation shown in

[0021] Figure 3 It is an exploded view of the fixed bracket, the lower conical oscillator and the upper conical oscillator;

[0022] Figure 4 It is an assembly drawing of the fixed bracket and the lower conical oscillator;

[0023] Figure 5 It is Figure 1 A cross-sectional view of an omnidirectional ceiling antenna structure with low third-order intermodulation as shown;

[0024] Figure 6 It is Figure 5 An enlarged view of area A as shown. Specific implementation manners

[0025] In the description of the present utility model, it should be understood that the terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the indicated elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0026] The embodiments of the present utility model will be further described below with reference to the drawings.

[0027] As Figures 1-6 shown, the present embodiment provides an omnidirectional ceiling antenna structure with low third-order intermodulation, and the omnidirectional ceiling antenna structure with low third-order intermodulation is a single-polarization omnidirectional ceiling antenna or a dual-polarization omnidirectional ceiling antenna structure.

[0028] The omnidirectional ceiling antenna structure with low third-order intermodulation includes a bottom plate 10, an oscillator assembly 20, a connection assembly 30, and a feeding assembly 40.

[0029] The bottom plate 10 serves as a carrier for installing other components of the omnidirectional ceiling antenna structure with low third-order intermodulation. The oscillator assembly 20 is installed on the bottom plate 10, and the oscillator assembly 20 is used for radiating and receiving radio signals. The feeding assembly 30 is connected to the oscillator assembly 30 for signal transmission.

[0030] The oscillator assembly 20 includes a lower conical oscillator 21 and an upper conical oscillator 22. The lower conical oscillator 21 is fixed to the bottom plate 10, and the upper conical oscillator 22 is connected to the lower conical oscillator 21 through the connection assembly 30.

[0031] The lower conical oscillator 21 is a conical thin-wall structure, and the lower half of the upper conical oscillator 22 is also a conical thin-wall structure. The lower half of the upper conical oscillator 22 is connected to the lower conical oscillator 21.

[0032] The connection component 30 includes a fixed bracket 31, an outer conductor welding seat 32, a plastic nut 33, and a high-temperature resistant insulating gasket 34.

[0033] The bottom of the fixed bracket 31 is connected to the lower conical oscillator 21, and the top supports the upper conical oscillator 22. The fixed bracket 31 includes a base 311, a convex ring 312, a clamping strip 313, a clamping hook 314, and a support strip 315.

[0034] The base 311 is of an annular structure, and a through hole 3110 is provided at the center position thereof.

[0035] The convex ring 312 is arranged on the bottom surface of the base 311 and surrounds the edge of the through hole 3110. The clamping strip 313 extends radially outward from the outer wall of the convex ring 312 along the radial direction of the convex ring 312. A plurality of the clamping strips 313 are distributed in an annular array along the axis of the convex ring 312. In this embodiment, the number of the clamping strips 313 is four.

[0036] A first mounting hole 210 is penetrated through the top of the lower conical oscillator 21. A clamping groove 211 is formed by the hole wall of the first mounting hole 210 recessing away from the axis direction. The shape of the first mounting hole 210 matches the shape of the convex ring 312, and the shape of the clamping groove 211 matches the shape of the clamping strip 313.

[0037] The base 311 is carried on the top of the lower conical oscillator 21. The convex ring 312 is installed in the first mounting hole 210, and the clamping strips 313 are respectively clamped in the clamping grooves 211. The cooperation between the clamping strips 313 and the clamping grooves 211 can limit the rotation of the convex ring 312 in the first mounting hole 210 and maintain the connection stability between the fixed bracket 31 and the lower conical oscillator 21. Moreover, the cooperation structure between the clamping grooves 211 and the clamping strips 313 can also play an auxiliary positioning role when the fixed bracket 31 is installed.

[0038] The clamping hooks 314 and the support strips 315 are both arranged on the top surface of the base 311. A plurality of the clamping hooks 314 are distributed in an annular array along the axis of the base 311, and a plurality of the support strips 315 are distributed in an annular array along the axis of the base 311. In this embodiment, the number of both the clamping hooks 314 and the support strips 315 is three.

[0039] The hook 314 includes a hook body 3141 and a wedge block 3142 provided at the top of the hook body 3141. The wedge block 3142 protrudes toward the inner side of the hook body 3141. A second mounting hole 220 is provided through the conical part of the upper conical oscillator 22 corresponding to the position of the hook 314. The hook body 3141 passes through the second mounting hole 220, and the wedge part 3142 abuts against the inner surface of the conical part of the upper conical oscillator 22 for clamping the upper conical oscillator 22. On the one hand, it can limit the rotation of the upper conical oscillator 22, and on the other hand, it can also limit the up and down movement of the upper conical oscillator 22, ensuring the connection stability between the upper conical oscillator 22 and the fixed bracket 31.

[0040] The support bar 315 includes a connecting part 3151 and a support part 3152 that extends obliquely outward away from the axis of the base 311 from the top of the connecting part 3151. The bottom of the connecting part 3151 is fixed to the base 311. The support part 3152 abuts against the outer surface of the conical part of the upper conical oscillator 22. An elastic part 3153 is provided on the side of the support part 3152 close to the upper conical oscillator 22. The elastic part 3153 is made of an elastic material. The interference fit between the elastic part 3153 and the upper conical oscillator 22 is used to increase the support effect on the upper conical oscillator 22, improve the installation stability of the upper conical oscillator 22, and can also buffer the vibration of the upper conical oscillator 22 to prevent the upper conical oscillator 22 from loosening.

[0041] Preferably, the base 311, the convex ring 312, the card strip 313, the hook 314 and the support bar 315 are integrally formed.

[0042] The outer conductor welding seat 32 is installed on the first mounting hole 210. The outer conductor welding seat 32 includes a seat body 321 and a screw 322. The seat body 321 is located below the lower conical oscillator 21 and abuts against the convex ring 312. The screw 322 passes through the hollow area of the convex ring 312 and is exposed. The plastic nut 33 is threadedly connected to the screw 322. The plastic nut 33 is located above the base 311. The plastic nut 33 and the seat body 321 cooperate to clamp the lower conical oscillator 21 and the convex ring 312, realizing the fastening between the fixed bracket 31 and the lower conical oscillator 21.

[0043] The high-temperature resistant insulating gasket 34 is clamped between the plastic nut 33 and the upper conical oscillator 22 to play an insulating barrier role.

[0044] The feeding component 40 includes a coaxial cable 41 and a coaxial connector 42. The outer conductor welding seat 321 and the high-temperature resistant insulating gasket 34 are both of hollow structures. The coaxial cable 41 passes through the hollow areas of the outer conductor welding seat 321 and the high-temperature resistant insulating gasket 34 to be connected to the upper conical oscillator 22. The coaxial connector 42 is arranged at one end of the coaxial cable 41 away from the high-temperature resistant insulating gasket 34 for realizing the connection between the coaxial cable 41 and an external device.

[0045] In the present utility model, the connection component 30 is added to the lower conical oscillator 21 and the upper conical oscillator 22. The fixed bracket 31 in the connection component 30 is used to support and clamp the upper conical oscillator 22, maintaining the installation stability of the upper conical oscillator 22, avoiding cracking at the welding joint between the coaxial cable 41 and the upper conical oscillator 22 caused by the shaking of the upper conical oscillator 22, and effectively reducing the third-order intermodulation data to ensure the stability of signal transmission. The assembly structure of the convex ring 312 and the lower conical oscillator 21 can increase the connection stability between the fixed bracket 31 and the lower conical oscillator 21, and the convex ring 312 can also block the circumferential contact between the outer conductor welding seat 32 and the first mounting hole 210, effectively avoiding the third-order intermodulation problem caused by non-linear contact failure due to electrical conduction.

[0046] The above embodiments are only used to illustrate the technical concept and characteristics of the present utility model, and their purpose is to enable those who are familiar with this technology to understand the content of the present utility model and implement it accordingly, and cannot be used to limit the protection scope of the present utility model. All equivalent changes or modifications made according to the spirit of the present utility model should be covered within the protection scope of the present utility model.

Claims

1. An omnidirectional ceiling antenna structure with low third-order intermodulation, characterized in that: The invention comprises a vibrator assembly, a connecting assembly and a feeding assembly, wherein the vibrator assembly comprises a lower cone vibrator and an upper cone vibrator, wherein the upper cone vibrator and the lower cone vibrator are connected via the connecting assembly, wherein the connecting assembly comprises a fixing bracket, wherein the bottom of the fixing bracket is connected to the lower cone vibrator, and the top supports the upper cone vibrator, wherein the fixing bracket comprises a base, a convex ring, a clamping strip, a clamping hook and a supporting strip, wherein the base is a circular ring structure, wherein a through hole is arranged at the center thereof, wherein the convex ring is arranged on the bottom surface of the base and surrounds the edge of the through hole, wherein the clamping strip extends outward from the outer wall of the convex ring along the radial direction of the convex ring, and wherein the lower cone vibrator is A first mounting hole is provided through the top of the base, and a hole wall of the first mounting hole is recessed in a direction away from the axis to form a slot. The base is supported on the top of the lower conical vibrator, the convex ring is installed in the first mounting hole, and the clamping strip is clamped in the slot; the hook and the support strip are both arranged on the top surface of the base, and a second mounting hole is provided through the conical part of the upper conical vibrator corresponding to the position of the hook, and the top of the hook passes through the second mounting hole and abuts against the inner surface of the conical part of the upper conical vibrator; the support strip abuts against the outer surface of the conical part of the upper conical vibrator, and the feeding assembly is connected to the vibrator assembly for transmitting signals.

2. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 1, characterized in that: The shape of the first mounting hole matches the shape of the convex ring, and the shape of the clamping groove matches the shape of the clamping strip.

3. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 2, characterized in that: The plurality of clamping strips are distributed in a ring array along the axis of the convex ring, and the clamping grooves are arranged in a one-to-one correspondence with the clamping strips.

4. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 1, characterized in that: The plurality of hooks are distributed in a ring array along the axis of the base, and the plurality of support bars are distributed in a ring array along the axis of the base.

5. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 4, characterized in that: The hook includes a hook body and a wedge block arranged on the top of the hook body, the wedge block protrudes toward the inner side of the hook body, the hook body passes through the second mounting hole, and the wedge block abuts the inner surface of the conical part of the upper conical vibrator; the support bar includes a connecting portion and a supporting portion extending outwardly from the top of the connecting portion in an inclined direction away from the axis of the base, the bottom of the connecting portion is fixed to the base, and the supporting portion abuts the outer surface of the conical part of the upper conical vibrator.

6. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 5, characterized in that: An elastic part is arranged on a side of the support part close to the upper cone-shaped vibrator. The elastic part is made of an elastic material and is interference-connected with the upper cone-shaped vibrator.

7. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 1, characterized in that: The base, the convex ring, the clamping strip, the clamping hook and the supporting strip are integrally formed.

8. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 1, characterized in that: The connecting assembly also includes an outer conductor welding seat, a plastic nut and a high temperature resistant insulating gasket. The outer conductor welding seat is installed on the first mounting hole. The outer conductor welding seat includes a seat body and a screw. The seat body is located below the lower conical vibrator and abuts the convex ring. The screw passes through the hollow area of ​​the convex ring and is exposed. The plastic nut is threadedly connected to the screw. The plastic nut is located above the base. The plastic nut cooperates with the seat body to clamp the lower conical vibrator and the convex ring. The high temperature resistant insulating gasket is clamped between the plastic nut and the upper conical vibrator.

9. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 8, characterized in that: The feeding assembly includes a coaxial cable and a coaxial connector. The outer conductor welding seat and the high temperature resistant insulating gasket are both hollow structures. The coaxial cable passes through the hollow areas of the outer conductor welding seat and the high temperature resistant insulating gasket and is connected to the upper conical vibrator. The coaxial connector is arranged at one end of the coaxial cable away from the high temperature resistant insulating gasket, and is used to realize the connection between the coaxial cable and an external device.

10. The low third-order intermodulation omnidirectional ceiling antenna structure according to claim 1, characterized in that: The low third-order intermodulation omnidirectional ceiling antenna structure is a single-polarization omnidirectional ceiling antenna or a dual-polarization omnidirectional ceiling antenna structure.

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