Patent Publication Number: US-2021175624-A1

Title: Ultra-wideband wall-mounted antenna

Description:
TECHNICAL FIELD 
     The present disclosure relates to the field of antenna technologies, for example, relates to an ultra-wideband wall-mounted antenna. 
     BACKGROUND 
     With the advent of 4G (the 4th generation mobile communication technology) and 5G (5th-Generation, the 5th generation mobile communication technology) communication era, data requests are getting larger and larger. The communication system bandwidth in the era of 3G (third generation, the 3th generation mobile communication technology) can no longer meet demands of future communications, and systems need higher bandwidth. In the meanwhile, a variety of antenna bandwidths are also needed to be widened. Operators urgently need an ultra-wideband wall-mounted antenna capable of covering 350 M-2700 M. 
     In the related art, an indoor coverage wall-mounted antenna covering a frequency band 698 to 2700 MHz (Million Hertz) basically adopt two design modes. One design mode is a wideband design. This technology adopts an ordinary half-wave oscillator plus an additional resonant unit. Although this technical approach can achieve a wideband, the radiation performance of the antenna is relatively poor, the high-frequency part of the beams is split, and there often exists a blind zone in coverage. The other one is frequency division design. The frequency band is divided into two main operation frequency bands 689-960 MHz/1710-2700 MHz, and a combiner is adopted to combine two antennas to one frequency band for usage. This technical approach has a good antenna coverage performance, but the cost is higher. At present, neither of the above two solutions can provide the indoor coverage antenna with an ultra-wideband of 350-3500 MHZ. 
     SUMMARY 
     To solve the above technical problem, embodiments of the present disclosure provide an ultra-wideband wall-mounted antenna to achieve low cost and ultra-wideband pattern directional coverage. 
     An embodiment of the present disclosure provides an ultra-wideband wall-mounted antenna. The ultra-wideband wall-mounted antenna includes a first element sheet, a second element sheet, a third element and a reflection board. Each of the first element sheet, the second element sheet, the third element and the reflection board is a flat surface. Both of the second element sheet and the third element sheet are disposed in parallel with the reflection board. The third element sheet is disposed between the second element sheet and the reflection sheet, and the first element sheet extends from an inner edge of the second element sheet onto a surface of the reflection board. 
     According to the ultra-wideband wall-mounted antenna provided by embodiments of the present disclosure, the first element sheet, the second element sheet and the third element are configured in a non-co-planar multi-layer structure, realizing a low cost and an ultra-wideband pattern directional coverage. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view of an ultra-wideband wall-mounted antenna provided by a first embodiment. 
         FIG. 2  is a partial perspective view of the ultra-wideband wall-mounted antenna provided by the first embodiment. 
         FIG. 3  is a partial perspective view of an ultra-wideband wall-mounted antenna provided by a second embodiment. 
     
    
    
     DETAILED DESCRIPTION 
     The present disclosure is described in detail below with reference to the accompanying drawings and embodiments. The following embodiments and features therein may be combined with each other without conflict. 
     First Embodiment 
     The present embodiment provides a technical solution of an ultra-wideband wall-mounted antenna. As shown in  FIG. 1 , the ultra-wideband wall-mounted antenna includes: a first element sheet ( 11 ,  12 ), a second element sheet ( 21 ,  22 ), a third element ( 31 ,  32 ), which are integrally formed, and a reflection board  41 . Optionally, the first element sheet ( 11 ,  12 ), the second element sheet ( 21 ,  22 ), and the third element ( 31 ,  32 ) are sheet-shaped, and may be made from metal. 
     The reflection board  41  is disposed at the bottom of the entire ultra-wideband wall-mounted antenna, and is configured to reflect electromagnetic waves radiated thereon such that beams of the antenna are concentrated in one direction. 
     A matching component  5  is disposed on the reflection board  41 . A function of the matching component  5  is to achieve impedance match between the element sheets and an antenna feeder. The matching component  5  is fixedly connected to the reflection board  41  by screws on the reflection board  41 . 
     The second element sheet ( 21 ,  22 ) and the third element sheet ( 31 ,  32 ) are disposed in parallel with the reflection board  41  respectively. The first element sheet ( 11 ,  12 ), the second element sheet ( 21 ,  22 ), the third element ( 31 ,  32 ), and the reflection board  41  are all made of conductive material, and are configured to radiate electromagnetic waves. 
     Compared with the second element sheet ( 21 ,  22 ), the third element sheet ( 31 ,  32 ) is closer to the reflection board  41 . The third element sheet includes a fifth element sub-sheet  31  and a sixth element sub-sheet  32 . The fifth element sub-sheet  31  and the sixth element sub-sheet  32  are axis-symmetric about a central normal line of the reflection board  41 . 
     The fifth element sub-sheet  31  and the sixth element sub-sheet  32  have relatively larger surface areas. In order to ensure the firm connections of the above two element sub-sheets, the fifth element sub-sheet  31  and the sixth element sub-sheet  32  are secured to the reflection board  41  by screws at the central positions of the fifth element sub-sheet  31  and the sixth element sub-sheet  32 . A height of the fifth element sub-sheet  31  from the reflection board  41  should be equal to a height of the sixth element sub-sheet  32  from the reflection board  41 . Moreover, the height of the fifth element sub-sheet  31  from the reflection board  41  and the height of the sixth element sub-sheet  32  from the reflection board  41  should be greater than a own height of the matching component  5 . 
     Similar to the third element sheet ( 31 ,  32 ), the second element sheet ( 21 ,  22 ) also includes two element sub-sheets which are axis-symmetric about the central normal line of the reflection board  41 . The two element sub-sheets are referred to as a third element sub-sheet  21  and a fourth element sub-sheet  22  respectively. Compared with the fifth element sub-sheet  31  and the sixth element sub-sheet  32 , the surface areas of the third element sub-sheet  21  and the fourth element sub-sheet  22  are relatively smaller. Due to the smaller surface areas, compared with the fifth element sub-sheet  31  and the sixth element sub-sheet  32 , fewer the firm connection points where screws are used are provided on the third element sub-sheet  21  and the fourth element sub-sheet  22 . 
     The first element sheet ( 11 ,  12 ) is composed of two element sub-sheets arranged in an inverted truncated chevron shape. The two element sub-sheets are referred to as a first element sub-sheet  11  and a second element sub-sheet  12 . As the same as the second element sheet and the third element sheet, the two element sub-sheets constituting the first element sheets, that is, the first element sub-sheet  11  and the second element sub-sheet  12  are also axis-symmetric about the central normal line of the reflection board  41 . 
     An upper edge of the first element sub-sheet  11  is fixedly connected to a first side edge of the third element sub-sheet  21 . The first element sub-sheet  11  goes downward obliquely from the first side edge of the third element sub-sheet  21  and extends to one end of the matching component  5 . That is to say, a first end of the element sub-sheet  11  opposite to the upper edge is in contact with the one end of the matching component  5 . 
     Correspondingly, the upper edge of the second element sub-sheet  12  is fixedly connected to a first side edge of the fourth element sub-sheet  22 . The second element sub-sheet  12  is inclined downward from the first side edge of the fourth element sub-sheet  22  and extends to an end portion of the matching component  5 . 
     Since the two element sub-sheets constituting the first element sheet ( 11 ,  12 ) have the above structure matching, a bell-mouth structure is formed by the reflection board  41  and the first element sheet ( 11 ,  12 ). Due to such a bell-mouth structure configuration, it is significantly beneficial to improve antenna gain. 
     The first element sub-sheet  11  is provided with a first columnar regulator  61 , and the second element sub-sheet  12  is provided with a second columnar regulator  62 . The functions of the two columnar regulators (the first columnar regulator  61  and the second columnar regulator  62 ) are to adjust standing waves of the first element sub-sheet  11  and the second element sub-sheet  12 . In operating frequency bands of the above two element sub-sheets, the current has maximum points at the two columnar regulators  61  and  62 , and wave peaks of the standing waves are formed. With configuration of the columnar regulators  61  and  62 , a part of the current flows to the columnar regulators  61  and  62  to reduce the energy reflection therein, such that an objective of improving the standing waves is achieved. Different bands may be adjusted when setting the columnar regulators  61 ,  62  on different positions of the first element sub-sheet  11  and the second element sub-sheet  12 . The columnar regulators  61 ,  62  may also be sheet-shaped. 
     In the present embodiment, the first element sheet ( 11 ,  12 ), the second element sheet ( 21 ,  22 ), and the third element sheet ( 31 ,  32 ) are all integrally formed. Fastening parts such as screws and studs used therebetween are for the purpose of partial reinforcement, but do not indicate the above components are separated components.  FIG. 2  is a partial perspective view of the ultra-wideband wall-mounted antenna provided by the embodiment. As shown in  FIG. 2 , there is no gap among the multiple components shown in the figure, that is, the multiple components are integrally formed. 
     The first element sheet mainly implements the frequency coverage of a frequency band from 1.7 GHz to 3.5 GHz. The second element sheet mainly implements the frequency coverage of a frequency band from 0.7 GHz to 1.7 GHz. The third element sheet implements the frequency coverage of a frequency band from 0.35 GHz to 0.7 GHz. 
     It should be noted that, the couplings among the first element sheet ( 11 ,  12 ), the second element sheet ( 21 ,  22 ), and the third element sheet ( 31 ,  32 ) are all capacitive couplings. Adopting the capacitive couplings can avoid generation of passive intermodulation between different element sheets. 
     In the ultra-wideband wall-mounted antenna provided by the present embodiment, a multi-layer non-coplanar structure is adopted, which is completely beneficial for improving space utilization and making the antenna itself more compact. 
     In the present embodiment, the first element sheet, the second element sheet and the third element are configured in the multi-layer non-coplanar structure, realizing a low cost and an ultra-wideband radiation pattern directional coverage. 
     Second Embodiment 
     The embodiment provides another technical solution of the ultra-wideband wall-mounted antenna. As shown in  FIG. 3 , the ultra-wideband wall-mounted antenna in the embodiment includes: a first element sheet  7 , a second element sheet  8  and a third element sheet  9  which are formed separately, and a reflection board  41  (not shown in  FIG. 3 , but refer to  FIG. 1 ). 
     In addition to the separate formations, the difference between the second embodiment and the first embodiment in that: a first coupling sheet  101  is provided below the second element sheet  8 , and a second coupling sheet  102  is further provided between an edge of the second element sheet  8  and the third element sheet  9 . A function of the first coupling sheet  101  is to adjust the coupling between the second element sheet  8  and the first element sheet  7  to be the capacitive coupling. A function of the second coupling sheet  102  is to adjust the coupling between the second element sheet  8  and the third element sheet  9  to be the capacitive coupling. 
     INDUSTRIAL APPLICABILITY 
     According to the ultra-wideband wall-mounted antenna provided by embodiments of the present disclosure, the first element sheet, the second element sheet and the third element are configured in a multi-layer non-coplanar structure, which realizes a low cost and an ultra-wideband radiation pattern directional coverage.