Broadband dual-polarized small-size ceiling antenna

Abstract

The invention provides a broadband dual-polarized small-size ceiling antenna. The broadband dual-polarized small-size ceiling antenna comprises a large lower cone radiation oscillator, the small upper cone radiation oscillator is arranged below the large lower cone radiation oscillator; the circular array horizontal radiation oscillator is arranged between the large lower cone radiation oscillator and the small upper cone radiation oscillator; and the cable transmission ports are respectively connected to the bottom of the circular array horizontal radiation oscillator and the bottom of the large lower cone radiation oscillator, and one end of each cable transmission port penetrates through the small upper cone radiation oscillator and the circular array horizontal radiation oscillator. According to the invention, various indexes of the internal antenna can meet the requirements of mobile communication technical specifications while the broadband dual-polarization small-size ceiling antenna is reduced.

Description

Technical Field

[0001] The present invention relates to the field of antenna technology, and in particular to a broadband dual-polarization small-size ceiling antenna. Background Art

[0002] With the development of mobile communications, dual-polarized antennas are currently one of the main application areas. Dual-polarized antennas can simultaneously receive and transmit signals in the horizontal and vertical polarization directions, ensuring more stable and reliable communication quality. Dual-polarized antennas can also achieve signal transmission in different frequency bands, applicable to different communication standards and frequency band requirements.

[0003] In the existing technology, dual-polarized ceiling antennas are all large-sized products, with diameters generally around Ф200 or Ф180, resulting in excessively high costs. When the dual-polarized ceiling antennas are reduced in size, it will be difficult for various indicators inside the antenna to meet the requirements of mobile communication technical specifications. Summary of the invention

[0004] Based on this, an object of the present invention is to provide a broadband dual-polarization small-size ceiling-mounted antenna to solve the above-mentioned deficiencies in the prior art.

[0005] The present invention provides a broadband dual-polarization small-size ceiling antenna, comprising:

[0006] Large lower cone radiating oscillator;

[0007] A small upper cone radiating vibrator, wherein the small upper cone radiating vibrator is arranged below the large lower cone radiating vibrator;

[0008] A circular array horizontal radiating vibrator, wherein the circular array horizontal radiating vibrator is arranged between the large lower cone radiating vibrator and the small upper cone radiating vibrator;

[0009] The cable transmission port is respectively connected to the bottom of the circular array horizontal radiating vibrator and the bottom of the large lower cone radiating vibrator, and one end of the cable transmission port passes through the small upper cone radiating vibrator and the circular array horizontal radiating vibrator.

[0010] Compared with the prior art, the beneficial effect of the present invention is that through the large lower cone radiating element, the small upper cone radiating element and the circular array horizontal radiating element, the internal antenna indicators can meet the requirements of mobile communication technical specifications while reducing the size of the broadband dual-polarization small-size ceiling antenna.

[0011] Furthermore, the circular array horizontal radiating vibrator includes a plurality of horizontal radiating vibrators, and the plurality of horizontal radiating vibrators are arranged in a circular array to form the circular array horizontal radiating vibrator.

[0012] Furthermore, the cable transmission port includes a horizontally polarized cable transmission port and a vertically polarized cable transmission port, one end of the horizontally polarized cable transmission port is connected to the bottom of the circular array horizontal radiating vibrator, and the other end of the horizontally polarized cable transmission port passes through the small upper cone radiating vibrator, one end of the vertically polarized cable transmission port is connected to the bottom of the large lower cone radiating vibrator, and the other end of the vertically polarized cable transmission port passes through the circular array horizontal radiating vibrator and the small upper cone radiating vibrator.

[0013] Furthermore, the broadband dual-polarization small-size ceiling antenna also includes an outer cover, which covers the large lower cone radiating element, the small upper cone radiating element and the circular array horizontal radiating element. The diameter of the outer cover is 150mm to 170mm, and the height of the outer cover is 118mm to 110mm.

[0014] Furthermore, the large lower cone radiation vibrator is arranged in a conical structure, the height of the large lower cone radiation vibrator is 32mm~48mm, the bottom diameter of the large lower cone radiation vibrator is 145mm~165mm, and the angle inside the top of the large lower cone radiation vibrator is 116°~121°.

[0015] Furthermore, a protruding structure is provided at the bottom of the small upper cone radiating oscillator.

[0016] Furthermore, a PCB substrate is provided between the large lower cone radiating vibrator and the small upper cone radiating vibrator, and a plurality of the horizontal radiating vibrators are arranged on the PCB substrate.

[0017] Furthermore, the upper surface of the PCB substrate is covered with copper and is provided with 5 groups of half-wave oscillators.

[0018] Furthermore, the lower surface of the PCB substrate is covered with copper and is provided with 5 groups of coupled feeding microstrip lines.

[0019] Furthermore, the coupled feeding microstrip line is connected to the horizontal polarization cable transmission port and the vertical polarization cable transmission port through an impedance transformation line. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the structure of a broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of a small upper cone radiating vibrator in an embodiment of the present invention;

[0022] Figure 3 A bottom view of a small upper cone radiating vibrator in an embodiment of the present invention;

[0023] Figure 4Schematic diagram of the structure of a large lower cone radiation oscillator in an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the structure of a small upper cone radiating vibrator and a large lower cone radiating vibrator in an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 1 ;

[0026] Figure 7 Schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 2 ;

[0027] Figure 8 Schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 3 ;

[0028] Fig. 9 Schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 4 ;

[0029] Fig.10 Schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 5 ;

[0030] Fig.11 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 1 ;

[0031] Fig.12 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 2 ;

[0032] Fig.13 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 3 ;

[0033] Fig.14 The structure of the PCB substrate in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0034] Fig.15 The structure of the PCB substrate in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0035] Fig.16 The structure of the PCB substrate in the embodiment of the present invention is shown in FIG. Figure 3 ;

[0036] Fig.17The structure of the PCB substrate in the embodiment of the present invention is shown in FIG. Figure 4 ;

[0037] Fig.18 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 4 ;

[0038] Fig.19 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 5 ;

[0039] Fig. 20 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 6 ;

[0040] Fig.21 A three-dimensional schematic diagram of the gain direction of the broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention Figure 7 ;

[0041] Fig. 22 It is a schematic structural diagram of a small upper cone radiating vibrator, a large lower cone radiating vibrator and a PCB substrate in an embodiment of the present invention;

[0042] Fig.23 The structure of the PCB substrate in the embodiment of the present invention is shown in FIG. Figure 5 .

[0043] Description of main component symbols:

[0044] 1. Outer cover; 2. Large lower cone radiating oscillator; 3. Small upper cone radiating oscillator; 4. Horizontal radiating oscillator; 5. Horizontal polarization cable transmission port; 6. Vertical polarization cable transmission port;

[0045] 31. Raised structure; 41. Half-wave oscillator; 42. Coupled-fed microstrip line; 43. Microstrip feeding network; 44. Impedance transformation line.

[0046] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0048] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0050] See also Figures 1 to 5 , shown is a broadband dual-polarization small-size ceiling antenna in an embodiment of the present invention, including a large lower cone radiating element 2, a small upper cone radiating element 3, a horizontal radiating element 4 and a cable transmission port, and the cable transmission port includes a horizontally polarized cable transmission port 5 and a vertically polarized cable transmission port 6.

[0051] The small upper cone radiation vibrator 3 is arranged below the large lower cone radiation vibrator 2, the horizontal radiation vibrator 4 is provided with a plurality of groups, and the plurality of groups of the horizontal radiation vibrators 4 are arranged in a circular array to form a circular array horizontal radiation vibrator, the circular array horizontal radiation vibrator is arranged between the large lower cone radiation vibrator 2 and the small upper cone radiation vibrator 3, one end of the horizontal polarization cable transmission port 5 is connected to the bottom of the circular array horizontal radiation vibrator, and the other end of the horizontal polarization cable transmission port 5 passes through the small upper cone radiation vibrator 3, one end of the vertical polarization cable transmission port 6 is connected to the bottom of the large lower cone radiation vibrator 2, and the other end of the vertical polarization cable transmission port 6 passes through the circular array horizontal radiation vibrator and the small upper cone radiation vibrator 3. It should be noted that there are 5 groups of horizontal radiation vibrators. The large lower cone radiation vibrator 2, the small upper cone radiation vibrator 3 and the circular array horizontal radiation vibrator are covered by an outer cover 1.

[0052] Specifically, in the present embodiment, the diameter of the outer cover 1 is 160 mm, and the height of the outer cover 1 is 110 mm. In other optional embodiments, the diameter of the outer cover 1 can be selected within the range of 150 mm to 170 mm, and the height of the outer cover 1 can be selected within the range of 118 mm to 110 mm.

[0053] Specifically, in the present embodiment, the large lower cone radiation vibrator 2 is a conical structure, the height of the large lower cone radiation vibrator 2 is 45 mm, the bottom diameter of the large lower cone radiation vibrator 2 is 150 mm, and the angle inside the top of the large lower cone radiation vibrator 2 is 120°. In other optional embodiments, the height of the large lower cone radiation vibrator 2 is optional in the range of 32 mm to 48 mm, the bottom diameter of the large lower cone radiation vibrator 2 is optional in the range of 145 mm to 165 mm, and the angle inside the top of the large lower cone radiation vibrator 2 is optional in the range of 116° to 121°.

[0054] Furthermore, a protruding structure 31 is provided at the bottom of the small upper cone radiation vibrator 3. This enables it to better reflect electromagnetic waves with the large lower cone radiation vibrator 2. By limiting the wide cone angle to be different from the angle of the two cone arms of the upper and lower cones, an asymmetric biconical antenna is formed; the radiation direction of the electromagnetic wave signal can be effectively adjusted, thereby adjusting the gain, circularity and cross-polarization ratio (circularity) of the electromagnetic wave signal in different frequency bands. Accordingly, through the mutual coordination of the three elements of cone angle, height and maximum diameter of the lower cone, as shown in the following example: Figure 4 As shown, the vertical polarization cable transmission port is used for signal reception and transmission, so that the vertical polarization omnidirectional antenna can meet the following mobile vertical polarization index requirements in a smaller size: the antenna gain in the 880-960MHz frequency band is greater than 1dBi, the antenna gain in the 1710-1850MHz frequency band is greater than 2dBi, and the antenna gain in the 1850-2700MHz frequency band is greater than or equal to 3dBi; the low-frequency roundness in the 880-960MHz frequency band is less than 1.0dB, and the high-frequency roundness in the 1710-2700MHz frequency band is less than 1.5dB; the cross-polarization ratio (roundness) in the 880-960MHz frequency band is greater than 13dB, and the cross-polarization ratio (roundness) in the 1710-2700MHz frequency band is greater than 13dB. Figures 6 to 13 shown.

[0055] Specifically, in this embodiment, a PCB substrate is provided between the large lower cone radiation vibrator 2 and the small upper cone radiation vibrator 3, and a plurality of the horizontal radiation vibrators 4 are provided on the PCB substrate. The upper surface of the PCB substrate is copper-clad and provided with 5 groups of half-wave vibrators 41. Fig.14 As shown, the lower surface of the PCB substrate is copper-clad and provided with 5 sets of coupled feeding microstrip lines 42, as shown in FIG. Fig.15 As shown, the coupled feeding microstrip line 42 is connected to the horizontal polarization cable transmission port and the vertical polarization cable transmission port through the impedance transformation line 44, so as to propagate the radiated electromagnetic wave through the horizontal polarization cable transmission port and the vertical polarization cable transmission port. Figure 16 to Figure 17 shown.

[0056] It needs to be explained that, firstly, a half-wave oscillator is designed according to the frequency band bandwidth, the circular array arrangement is calculated, and then the coupled feeding microstrip line 42 is designed to construct a complete radiating half-wave oscillator 41, and then the feeding network microstrip line 43 is designed, and the matching resistance is adjusted through the impedance transformation line 44. The simulation software is used to calculate the same microstrip line length to ensure that the phase output is basically the same signal peak, and then the same microstrip line width is calculated to output basically the same power ratio. Then the designed microstrip feeding network is connected to 5 groups of coupled feeding microstrips to form a complete network, and a complete horizontal polarization antenna is constructed. Fig.17 As shown, the following mobile horizontal polarization technical indicators are met: the antenna gain in the 1880-2700MHz frequency band is greater than or equal to 2.5dBi; the high-frequency band roundness in the 1880-2700MHz frequency band is less than 2.0dB; the cross-polarization ratio (roundness) in the 1880-2700MHz frequency band is greater than 11dB. Figure 18-Figure 21 shown.

[0057] It is worth noting that in order to meet the requirements of the S parameter index, the current capacitance and resistance performance are changed on the microstrip feed network 43. If the microstrip line is lengthened or widened, the S parameter will be improved, but the phase and power ratio index will be changed, the circularity of the directional pattern and the cross-polarization ratio will be deteriorated, and the mobile communication index specification requirements will be met. The verification method adopts the superposition method and the adjustable S parameter index, which does not affect the phase and power ratio of the network microstrip line. The S parameters, circularity of the directional pattern and the cross-polarization ratio all meet the requirements of the mobile communication index specification. In addition, the two orthogonal radiating elements of the horizontal polarization cable transmission port and the vertical polarization cable transmission port are further arranged together to form a complete dual-polarization omnidirectional ceiling antenna, such as Figure 1 shown.

[0058] In summary, the broadband dual-polarization small-size ceiling antenna in the above-mentioned embodiment of the present invention has one port for transmitting and receiving radiation signals of vertical polarization, and the other port for transmitting and receiving radiation signals of horizontal polarization, so as to realize the transmission and reception of radio waves in different directions. The basic principle is to set two orthogonal radiating elements on the antenna, which are responsible for signal transmission in the horizontal and vertical directions respectively. In this way, the dual-polarization antenna can not only realize omnidirectional transmission, but also better adapt to different geographical environments and signal transmission requirements; the vertical polarization is composed of a special-shaped asymmetric double-cone oscillator, which is composed of a small upper cone radiating oscillator 3 and a large lower cone radiating oscillator 2 to form a vertical polarization radiation unit mode, and then the cable outputs the signal through the port to realize the vertical polarization radiation direction coverage; the horizontal polarization oscillator is composed of five groups of half-wave oscillators 41 and a coupled feeding network, and the half-wave oscillator 41 is a circular array composed of five groups of oscillators, which are composed of a microstrip feeding network, and then the cable outputs the signal through the port to realize the horizontal polarization omnidirectional 360-degree radiation coverage, such as Fig. 22 and Fig.23As shown. Solve the market. Solve the market. Large-size dual-polarized ceiling antennas generally have diameters of around Ф200 or Ф180. The original cost was high and the index stability was poor. In particular, the roundness of the horizontal polarized antenna was greater than 2.5, which could not meet the requirements of mobile communication technical specifications. A new lightweight and small-size dual-polarized ceiling antenna with a diameter less than Ф165 was designed. While reducing the size, it was necessary to ensure that the various indicators of the internal antenna met the requirements of mobile communication technical specifications.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A broadband dual-polarized small-size ceiling antenna, characterized in that: include: Large lower cone radiating oscillator; A small upper cone radiating vibrator, wherein the small upper cone radiating vibrator is arranged below the large lower cone radiating vibrator; A circular array horizontal radiating vibrator, wherein the circular array horizontal radiating vibrator is arranged between the large lower cone radiating vibrator and the small upper cone radiating vibrator; The cable transmission port is respectively connected to the bottom of the circular array horizontal radiating vibrator and the bottom of the large lower cone radiating vibrator, and one end of the cable transmission port passes through the small upper cone radiating vibrator and the circular array horizontal radiating vibrator.

2. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: The circular array horizontal radiating vibrator includes a plurality of horizontal radiating vibrators, and the plurality of horizontal radiating vibrators are arranged in a circular array to form the circular array horizontal radiating vibrator.

3. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: The cable transmission port includes a horizontally polarized cable transmission port and a vertically polarized cable transmission port, one end of the horizontally polarized cable transmission port is connected to the bottom of the circular array horizontal radiating vibrator, and the other end of the horizontally polarized cable transmission port passes through the small upper cone radiating vibrator, one end of the vertically polarized cable transmission port is connected to the bottom of the large lower cone radiating vibrator, and the other end of the vertically polarized cable transmission port passes through the circular array horizontal radiating vibrator and the small upper cone radiating vibrator.

4. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: The broadband dual-polarization small-size ceiling antenna also includes an outer cover, which covers the large lower cone radiating element, the small upper cone radiating element and the circular array horizontal radiating element. The diameter of the outer cover is 150mm to 170mm, and the height of the outer cover is 118mm to 110mm.

5. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: The large lower cone radiation vibrator is arranged in a conical structure, the height of the large lower cone radiation vibrator is 32mm-48mm, the bottom diameter of the large lower cone radiation vibrator is 145mm-165mm, and the angle inside the top of the large lower cone radiation vibrator is 116°-121°.

6. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: A convex structure is provided at the bottom of the small upper cone radiation oscillator.

7. The broadband dual-polarization small-size ceiling antenna according to claim 1, characterized in that: A PCB substrate is provided between the large lower cone radiating vibrator and the small upper cone radiating vibrator, and a plurality of the horizontal radiating vibrators are arranged on the PCB substrate.

8. The broadband dual-polarization small-size ceiling antenna according to claim 7, characterized in that: The upper surface of the PCB substrate is covered with copper and is provided with 5 groups of half-wave oscillators.

9. The broadband dual-polarization small-size ceiling antenna according to claim 7, characterized in that: The lower surface of the PCB substrate is covered with copper and is provided with 5 groups of coupled feeding microstrip lines.

10. The broadband dual-polarization small-size ceiling antenna according to claim 9, characterized in that: The coupled feeding microstrip line is connected to the horizontal polarization cable transmission port and the vertical polarization cable transmission port through an impedance transformation line.

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