JP6593639B2 - Antenna device - Google Patents

Description

  The present invention relates to an antenna device that may be employed as a base station antenna of a mobile communication system installed on a utility pole in a city.

  Conventionally, as a base station antenna of a mobile communication system installed on a utility pole in a town, a dipole antenna formed by forming a dipole antenna line on a dielectric substrate and a wiring board formed by forming a microstrip line on the dielectric substrate are provided. An antenna device formed by electrical connection through solder connection is employed (see, for example, Patent Document 1).

JP 2006-352293 A JP 2014-216784 A

  However, since a dipole antenna formed by forming a dipole antenna line on a dielectric substrate is used, it is necessary to form a dipole antenna line having a total element length equivalent to a half-wave width on the dielectric substrate. It is difficult to avoid the use of a large-area dielectric substrate having a width as described above (a large dielectric substrate having a high price), and it is difficult to reduce the manufacturing cost of the antenna device more than ever. Also, because the base station antenna is installed on a power pole in the city, it may be exposed to strong winds and may receive a strong impact, and the solder may break and the dipole antenna and wiring board may be short-circuited. It is difficult to say that the connection strength is sufficient to withstand the threat of the natural environment. Also, since the microstrip line has a large loss when transmitting and receiving radio signals in a high frequency band of 2 GHz or higher, the plate-like first outer conductor to which the dipole antenna is fixed and the first outer conductor face each other and are separated in parallel. It is also conceivable to employ a triplate line in which an inner conductor is arranged via air insulation between a plate-like second outer conductor arranged (see, for example, Patent Document 2). The plate line has a problem of complicating the electrical connection between the dipole antenna and the wiring board.

  The object of the present invention is to reduce the manufacturing cost more than ever and improve the connection strength between the dipole antenna and the wiring board, thereby simplifying the electrical connection between the dipole antenna and the wiring board. It is to provide an antenna device that can do things.

  The present invention is an antenna device in which a dipole antenna and a wiring board are electrically connected, and the dipole antenna is fixed to the dipole antenna element formed by molding a sheet metal, and the conductor pattern. A power supply substrate formed on the surface of a dielectric substrate, and the wiring substrate faces the plate-like first outer conductor and the first outer conductor fixed to the dipole antenna. A triplate line is used in which an inner conductor is disposed via air insulation between a plate-like second outer conductor that is spaced apart in parallel, and the dipole antenna element is the dipole antenna element. Formed on one side and having a total element length equivalent to a half-wavelength width, and formed on the other side of the dipole antenna element and front A fixed portion fixed to the first outer conductor, and a bent portion formed by bending between the antenna portion and the fixed portion, and the power supply substrate is a back surface of the dielectric substrate. In contact with one side of the dipole antenna element, and is fixed to the dipole antenna element so that a part of the conductor pattern extends beyond the other side of the dipole antenna element, and the first outer conductor Is electrically connected to the fixed portion and is arranged in parallel with and spaced from the second outer conductor via a conductor spacer, and the second outer conductor passes through the conductor spacer and the first outer conductor The antenna device is electrically connected to a conductor, and the inner conductor is electrically connected to the conductor pattern.

  The conductor pattern is preferably insulated from the dipole antenna element through the dielectric substrate.

  The fixing portion is preferably fixed to the first outer conductor via an insulating sheet and electrically connected to the first outer conductor through the conductor spacer.

  The inner conductor is preferably electrically connected to the conductor pattern through solder connection.

  The dipole antenna element has a first insertion hole for inserting a snap fit for fixing itself and the power supply board, and the power supply board is used for fixing itself and the dipole antenna element. It is desirable to have a second insertion hole for inserting the snap fit.

  The first insertion hole and the second insertion hole are preferably formed at positions that overlap when the dipole antenna element and the power supply substrate are fixed.

  The first insertion hole is preferably formed in the antenna portion.

  The second insertion hole is preferably formed apart from the conductor pattern.

  The first insertion hole and the second insertion hole are preferably formed at two or more symmetrical positions.

  According to the present invention, the manufacturing cost can be reduced more than ever and the connection strength between the dipole antenna and the wiring board can be improved, and the electrical connection between the dipole antenna and the wiring board is simplified. An antenna device that can be provided can be provided.

It is a fragmentary sectional view of the antenna device concerning an embodiment of the invention. FIG. 3 is a three-sided view of a dipole antenna element of the antenna device of FIG. 1. FIG. 2 is a two-side view of a power supply board of the antenna device of FIG. 1. FIG. 3 is a three-sided view of a dipole antenna of the antenna device of FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  Referring to FIG. 1, an antenna device 100 according to an embodiment of the present invention is formed by electrically connecting a dipole antenna 101 and a wiring board 102.

  The dipole antenna 101 includes a dipole antenna element 103 and a power supply substrate 104. The dipole antenna element 103 is formed by molding a sheet metal 105. The power supply substrate 104 is fixed to the dipole antenna element 103 and has a conductive pattern 106 formed on the surface of the dielectric substrate 107.

  The wiring board 102 employs a triplate line 108. The triplate line 108 is formed between a plate-like first outer conductor 109 fixed to the dipole antenna 101 and a plate-like second outer conductor 110 disposed facing and facing the first outer conductor 109 and spaced in parallel. The inner conductor 112 is arranged through the air insulation 111.

  The dipole antenna element 103 has an antenna part 113, a fixed part 114, and a bent part 115. The antenna unit 113 is formed on one side (front view upper side) of the dipole antenna element 103 and has a total element length corresponding to a half-wave width. The fixing portion 114 is formed on the other side (lower side of the front view) of the dipole antenna element 103 and is fixed to the first outer conductor 109. The bent portion 115 is formed by bending between the antenna portion 113 and the fixed portion 114.

  Referring again to FIG. 1, the power supply substrate 104 brings the back surface of the dielectric substrate 107 into contact with one surface of the dipole antenna element 103, and part of the conductor pattern 106 extends beyond the other side of the dipole antenna element 103. The dipole antenna element 103 is fixed so that the

  As the sheet metal 105, an aluminum plate having high rust prevention and conductivity and low price can be used. Therefore, while providing a dipole antenna element 103 having both weather resistance and electrical characteristics, a large-area dipole for transmitting and receiving low-frequency radio signals (long-wave radio signals having a large half-wave width) is provided. Even when the antenna 101 is manufactured, the price of the dipole antenna element 103 can be kept low. Therefore, the manufacturing cost of the antenna device 100 can be greatly reduced as compared with the case of manufacturing a dipole antenna in which a dipole antenna line is formed on a dielectric substrate.

  As the conductor pattern 106, copper printed wiring having high conductivity can be used. When the conductor pattern 106 is formed on the surface of the dielectric substrate 107, it can be formed in an optimum pattern based on desired impedance characteristics. Therefore, the conductor pattern 106 has various shapes according to desired impedance characteristics. The conductor pattern 106 is insulated from the dipole antenna element 103 through the dielectric substrate 107. Therefore, the dipole antenna 101 and the wiring board 102 constitute a microstrip line having the conductor pattern 106 as a strip conductor and the dipole antenna element 103 as a ground conductor.

  As the dielectric substrate 107, a small-area dielectric substrate (a small-sized dielectric substrate with a low price) having a minimum area according to the shape of the conductor pattern 106 can be used. Therefore, even when manufacturing a large-area dipole antenna 101 for transmitting and receiving a radio signal in a low frequency band, a radio signal in a high frequency band (a short wavelength radio signal having a small half-wave width) is transmitted and received. Therefore, the dielectric substrate 107 having the same area as that of the dipole antenna 101 with a small area can be used in common (a small dielectric substrate with a low price can be used). Therefore, the manufacturing cost of the antenna device 100 can be greatly reduced as compared with the case of manufacturing a dipole antenna in which a dipole antenna line is formed on a dielectric substrate.

  The first outer conductor 109 is electrically connected to the fixed portion 114 and is disposed to face the second outer conductor 110 via the conductor spacer 116 and is spaced apart in parallel. Therefore, the distance between the first outer conductor 109 and the second outer conductor 110 can be kept constant. As the first outer conductor 109, an aluminum plate having high rust prevention and conductivity and low price can be used. Therefore, it is possible to provide the first outer conductor 109 having both weather resistance and electrical characteristics.

  The second outer conductor 110 is electrically connected to the first outer conductor 109 through the conductor spacer 116. As the second outer conductor 110, an aluminum plate having high rust prevention and conductivity and low price can be used. Therefore, it is possible to provide the second outer conductor 110 having both weather resistance and electrical characteristics.

  The inner conductor 112 is electrically connected to the conductor pattern 106 (a part of the conductor pattern 106 extending beyond the other side of the dipole antenna element 103) through the solder connection 117. As the internal conductor 112, a copper plate having high conductivity can be used. Therefore, it is possible to provide the inner conductor 112 having high electrical characteristics.

  The antenna unit 113 includes a pair of body portions 118 and 119 and a pair of arm portions 120 and 121. The pair of body portions 118 and 119 extend in the vertical direction (up and down direction in the front view) of the dipole antenna element 103 and are arranged in parallel on the same plane. The pair of arms 120 and 121 extend in the horizontal direction (left-right direction of the front view) of the dipole antenna element 103, are arranged in series on the same plane, and have an element length of a quarter wavelength width. The trunk portion 118 is formed integrally with the arm portion 120. The trunk portion 119 is formed integrally with the arm portion 121.

  The fixing portion 114 is fixed to the first outer conductor 109 via the insulating sheet 122 and is electrically connected to the first outer conductor 109 through the conductor spacer 116. As the insulating sheet 122, a thin resin sheet having a sheet thickness of about 100 μm can be used. When manufacturing the dipole antenna element 103, the sheet metal 105 is punched or bent to form the antenna portion 113, the fixing portion 114, and the bending portion 115. There is a risk that stress is inevitably applied, and the fixing portion 114 is distorted and the front surface and / or the back surface of the fixing portion 114 is not flat. Further, when the first outer conductor 109 and the fixing portion 114 are fixed, the first outer conductor 109 and the fixing portion 114 are sandwiched between the first fastening component 123 and the conductor spacer 116. 109 and / or the fixed portion 114 is inevitably stressed, the first outer conductor 109 and / or the fixed portion 114 is distorted, and the front surface and / or the back surface of the first outer conductor 109 and / or the fixed portion 114 is flat. There is a possibility that it is not. Therefore, when the first outer conductor 109 and the fixing portion 114 are fixed without using the insulating sheet 122, the first pole is obtained through the manufacture of the dipole antenna element 103 and / or the fixing of the first outer conductor 109 and the fixing portion 114. Due to the unstable electrical connection between the first outer conductor 109 and the fixed portion 114 due to the distortion introduced to the outer conductor 109 and / or the fixed portion 114, the intermodulation distortion increases and the signal-to-noise ratio decreases. There is a risk of becoming. Conversely, when the first outer conductor 109 and the fixing portion 114 are fixed via the insulating sheet 122, it is possible to alleviate the unstable electrical connection between the first outer conductor 109 and the fixing portion 114. Therefore, the intermodulation distortion can be reduced and the signal-to-noise ratio can be increased.

  The bent portion 115 is formed by bending the sheet metal 105 so that the antenna portion 113 and the fixed portion 114 form an angle of approximately 90 degrees. The angle formed by the antenna portion 113 and the fixed portion 114 is not limited to approximately 90 degrees, and can be changed to a desired angle.

  The conductor spacer 116 has a spacer portion 124, a first fastening portion 125, and a second fastening portion 126. As the conductor spacer 116, an iron spacer having high conductivity and mechanical characteristics can be used. Therefore, the first outer conductor 109, the second outer conductor 110, and the fixing portion 114 can be reliably electrically connected and the distance between the first outer conductor 109 and the second outer conductor 110 can be reliably maintained. Is possible. The spacer portion 124 is interposed between the first outer conductor 109 and the second outer conductor 110. The first fastening portion 125 is fastened to the first fastening component 123 through the first through hole 127 of the first outer conductor 109, the second through hole 128 of the insulating sheet 122, and the third through hole 129 of the fixing portion 114. The first outer conductor 109, the insulating sheet 122, and the fixing portion 114 are sandwiched between the first fastening component 123. The second fastening part 126 is fastened to the second fastening part 131 through the fourth through hole 130 of the second outer conductor 110, and sandwiches the second outer conductor 110 between the second fastening part 131. As the first fastening part 123, an iron fastening part having high electrical conductivity and mechanical characteristics can be used. As the second fastening part 131, an iron fastening part having high conductivity and mechanical characteristics can be used. Therefore, the first outer conductor 109, the insulating sheet 122, and the fixing portion 114 can be securely sandwiched between the first fastening portion 125 and the first fastening component 123, and the second fastening portion 126 and the second fastening component can be sandwiched. The second outer conductor 110 can be securely held between the first outer conductor 131 and the second outer conductor.

  Referring to FIG. 2, the dipole antenna element 103 has a first insertion hole 133 for inserting a snap fit 132 for fixing itself and the power supply substrate 104. As the snap fit 132, a resin snap fit with high detachability can be used. Therefore, the dipole antenna element 103 and the power supply substrate 104 can be easily detached. The first insertion hole 133 is formed in the antenna portion 113.

  Referring to FIG. 3, the power supply substrate 104 has a second insertion hole 134 for inserting a snap fit 132 for fixing itself and the dipole antenna element 103. The second insertion hole 134 is formed away from the conductor pattern 106. Therefore, since the snap fit 132 is hardly affected by heat due to the heat generation of the conductor pattern 106 due to the power supply, the loosening of the fixing between the dipole antenna element 103 and the power supply substrate 104 due to the deformation of the snap fit 132 is suppressed. I can do it.

  Referring to FIG. 4, the first insertion hole 133 and the second insertion hole 134 are formed at positions that overlap when the dipole antenna element 103 and the power supply substrate 104 are fixed. Therefore, the dipole antenna element 103 and the power feeding substrate 104 can be easily fixed by passing the snap fit 132 through the first insertion hole 133 and the second insertion hole 134. The first insertion hole 133 and the second insertion hole 134 are formed at two or more symmetrical positions. The symmetric position does not simply mean that the figure is symmetrical, but means a position where the characteristics are electrically symmetrical.

  In the antenna device 100 described above, since the dipole antenna element 103 formed by molding an inexpensive aluminum plate is employed, the manufacturing cost can be reduced more than ever. The dielectric substrate 107 is also used when manufacturing a small-area dipole antenna 101 for transmitting and receiving high-frequency radio signals and when manufacturing a large-area dipole antenna 101 for transmitting and receiving low-frequency radio signals. Since a low-priced small dielectric substrate can be used, manufacturing costs can be reduced more than ever. In addition, the first outer conductor 109 and the fixing portion 114 can be firmly sandwiched between the first fastening portion 125 and the first fastening component 123, and between the second fastening portion 126 and the second fastening component 131. In addition, since the second outer conductor 110 can be firmly held, the connection strength between the dipole antenna 101 and the wiring board 102 can be improved. In addition, the dipole antenna element 103, the first outer conductor 109, and the second outer conductor 110 can be easily electrically connected through the conductor spacer 116, and the conductor pattern 106 and the inner conductor 112 are easily electrically connected through the solder connection 117. Therefore, electrical connection between the dipole antenna 101 and the wiring board 102 can be simplified. Although the conductor pattern 106 and the internal conductor 112 are electrically connected through the solder connection 117, the dipole antenna element 103 is used by using the conductor spacer 116, the first fastening part 123, the second fastening part 131, and the snap fit 132. Since the positional relationship among the power supply substrate 104, the first outer conductor 109, the second outer conductor 110, and the inner conductor 112 is firmly fixed, even if the antenna device 100 is exposed to a storm and receives a strong impact, the solder It is difficult for an impact to be transmitted to the connection 117, and the level of connection strength between the conductor pattern 106 and the internal conductor 112 does not cause a problem.

  Therefore, according to the present invention, the manufacturing cost can be reduced more than ever, and the connection strength between the dipole antenna 101 and the wiring board 102 can be improved. It is possible to provide the antenna device 100 that can simplify the electrical connection.

DESCRIPTION OF SYMBOLS 100 Antenna apparatus 101 Dipole antenna 102 Wiring board 103 Dipole antenna element 104 Feeding board 105 Sheet metal 106 Conductive pattern 107 Dielectric board 108 Triplate line 109 First outer conductor 110 Second outer conductor 111 Air insulation 112 Inner conductor 113 Antenna part 114 Fixed Part 115 Bending part 116 Conductor spacer 117 Solder connection 118 Body part 119 Body part 120 Arm part 121 Arm part 122 Insulating sheet 123 First fastening part 124 Spacer part 125 First fastening part 126 Second fastening part 127 First through hole 128 First Second through hole 129 Third through hole 130 Fourth through hole 131 Second fastening component 132 Snap fit 133 First insertion hole 134 Second insertion hole

Claims (9)

An antenna device formed by electrically connecting a dipole antenna and a wiring board,
The dipole antenna has a dipole antenna element formed by molding a sheet metal, and a power supply substrate that is fixed to the dipole antenna element and has a conductor pattern formed on the surface of a dielectric substrate.
The wiring board is air-insulated between a plate-like first outer conductor fixed to the dipole antenna and a plate-like second outer conductor arranged facing and spaced apart from the first outer conductor in parallel. Adopts a triplate line with internal conductors arranged through
The dipole antenna element is formed on one side of the dipole antenna element and has a total element length corresponding to a half-wave width, and is formed on the other side of the dipole antenna element and the first outer conductor A fixed portion to be fixed, and a bent portion formed by bending between the antenna portion and the fixed portion,
The dipole antenna element is configured so that the back surface of the dielectric substrate is in contact with one side of the dipole antenna element and a part of the conductor pattern extends beyond the other side of the dipole antenna element. And is fixed
The first outer conductor is electrically connected to the fixed portion and is arranged in parallel and spaced from the second outer conductor via a conductor spacer,
The second outer conductor is electrically connected to the first outer conductor through the conductor spacer;
The antenna device, wherein the inner conductor is electrically connected to the conductor pattern. The antenna device according to claim 1, wherein the conductor pattern is insulated from the dipole antenna element through the dielectric substrate. The antenna device according to claim 1, wherein the fixing portion is fixed to the first outer conductor via an insulating sheet and is electrically connected to the first outer conductor through the conductor spacer. The antenna device according to claim 1, wherein the inner conductor is electrically connected to the conductor pattern through solder connection. The dipole antenna element has a first insertion hole for inserting a snap fit for fixing itself and the power supply board,
The antenna device according to any one of claims 1 to 4, wherein the power supply substrate has a second insertion hole for inserting a snap fit for fixing the power supply substrate and the dipole antenna element. The antenna device according to claim 5, wherein the first insertion hole and the second insertion hole are formed at positions that overlap when the dipole antenna element and the power supply substrate are fixed. The antenna device according to claim 5, wherein the first insertion hole is formed in the antenna unit. The antenna device according to any one of claims 5 to 7, wherein the second insertion hole is formed apart from the conductor pattern. The antenna device according to any one of claims 5 to 8, wherein the first insertion hole and the second insertion hole are formed at two or more symmetrical positions.

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