JP2806880B2 - Back combination sector antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear combination sector antenna device in which a transmitting sector antenna and a receiving sector antenna covering sector cells having different azimuth directions with respect to a base station are arranged behind each other. In particular, the present invention relates to a back combination sector antenna device suitable for a base station of a cellular mobile communication system such as an automobile telephone system.

[0002]

2. Description of the Related Art In a conventional cellular mobile communication system, a circular cell (radio zone) to be covered by each of a plurality of base stations is divided into a plurality of sector cells. There is a sector technology that arranges a sector antenna having directivity in a cell for each fan-shaped cell to suppress interference with other wireless zones and to effectively use a frequency. The above-mentioned sector antenna is installed on the antenna installation body such as the roof of the building that houses the base station device or a steel tower, but the number of sector antennas to be installed increases in proportion to the number of sectors, and with this increase, the installation work period In addition, there is a problem that construction member costs and installation space (place) increase.

Therefore, in order to reduce the above-mentioned construction, construction cost and installation space, the transmitting sector antenna and the receiving sector antenna covering sector cells having different azimuth directions with respect to the base station are placed on the back of each other. A rear combination sector antenna device arranged on the side is proposed (Japanese Patent Laid-Open No. 5-37232, title of the invention: sector cell type base station antenna). In this base station antenna, a plurality of reflector antennas having different azimuth directing directions of the main beam with respect to the base station are integrally formed, so that the plurality of sector antennas appear as if they are one antenna. In an example of the base station antenna, the reflector antennas are configured in a triangular cylindrical shape with the respective reflecting surfaces of the three reflecting plates facing outward, and a mast is inserted into the center position of each reflecting plate, and each reflecting plate is supported by a support arm. It is fixed to the mast. In the literature, page 83 of the mobile communication handbook (Saito and Tachikawa, published on November 15, 1995, Ohmsha), two antennas with beam directions different from each other by 120 ° were designed to reduce the wind receiving area. It is described that a two-beam antenna housed in the same cylindrical radome has been developed.

In the above-mentioned mobile communication system, a beam tilting technique for further attenuating radio wave radiation to a distant place, shortening the same frequency repetition available distance, and improving the frequency use efficiency is also used. Beam tilting means that the antenna directivity in the vertical plane with respect to the ground is
In this case, an example of a sector antenna using this beam tilting technique is disclosed in Japanese Patent Laid-Open No. Hei 4-23772.
No. 23 (Title of Invention: Sector zone antenna configuration system). However, this publication discloses that a tilting angle adjusting phase cable is connected to each sector antenna in order to independently set a beam tilting angle (hereinafter, also referred to as a tilt angle) of each sector antenna. However, it is not clear what effect the tilting angle adjusting phase cable can perform the tilting angle adjustment.

Hereinafter, a base station of a mobile communication system to which the sector antenna technology disclosed in Japanese Patent Laid-Open No. 5-37232 is applied will be described. FIGS. 7A and 7B are explanatory diagrams of a sector antenna arrangement in a base station as an example of the mobile communication system according to the present invention. FIG. 7A is a diagram showing a sector cell configuration, and FIG.

In this mobile communication system, a base station (not shown) is arranged near the center O of the circular radio zone 22. The radio zone 22 is composed of three sector cells A (a), B (b) and C (c) which are azimuthally different from each other by 120 ° with respect to the base station and are sector-shaped. Symbols A, B, and C are used for a sector antenna for transmission, and symbols a, b, and c are used for a sector antenna for reception. Sector antenna 1 for radiating radio waves to mobile stations of sector cells A, B and C respectively
1A, 11B and 11C, and sector cells a and b
And c, which respectively receive radio waves from the mobile stations, have antenna supports 21P, 21Q such as poles on the antenna installation body 2 such as the roof of a building that houses the base station device or a steel tower. 21
It is installed in combination with R. The operating frequency of this mobile communication system is 900 in an example of a car telephone system.
MHz band, sector antenna 11A as a transmitting antenna
Frequency difference between the radio wave emitted by the antenna and the like and the radio wave received by the sector antenna 11a as the receiving antenna is about 45 MHz.
It is.

The antenna installation body 2 has a triangular plane, and the sector antenna 1 is located near a point P, one of the vertices of the triangle.
1C and the sector antenna 11a, the sector antenna 11A and the sector antenna 11b are arranged near another Q point of the triangle vertex, and the sector antenna 11B and the sector antenna 11c are arranged near another R point of the triangle vertex. I do. A pair of the sector antenna 11C and the sector antenna 11a, a pair of the sector antenna 11A and the sector antenna 11b, and a pair of the sector antenna 11B and the sector antenna 11c respectively covering different sector cells are respectively arranged on the back side of each other ( Back combined). The sector antennas 11A, 11B and 1
1C, each of the sector antennas 11a, 11b and 11c is a reflector antenna provided with a reflector having an opening surface perpendicular to the ground, and a plurality of radiating elements are arranged so as to extend vertically from the ground to form an array. Make up.

FIG. 8 is a configuration diagram of a conventional base station apparatus in the mobile communication system of FIG.

In this base station apparatus, transmitters 4A, 4A
B and 4C are connected to sector cells A (a), B through sector antennas 11A, 11B and 11C, respectively.
(B) and C (c) are emitted, and the receivers 4a, 4
b and 4c are connected to sector cells a (A), b through sector antennas 11a, 11b and 11c, respectively.
Radio waves from (B) and c (C) are received. The multiplexers / demultiplexers 22A, 22B and 22C transmit the transmission signals from the transmitters 4A, 4B and 4C to the sector antennas 11A, 11B.
And 11C are respectively distributed to a plurality of radiating elements, and the multiplexers / demultiplexers 22a, 22b and 22c combine received signals from the plurality of radiating elements of the sector antennas 11a, 11b and 11c, respectively, to form the receivers 4a and 4c. Send to 4b and 4c. The sector antenna 11A and the multiplexer / demultiplexer 22A, the sector antenna 11B and the multiplexer / demultiplexer 22B,
Sector antenna 11C and multiplexer / demultiplexer 22C, sector antenna 11a and multiplexer / demultiplexer 22a, sector antenna 11
b and the multiplexer / demultiplexer 22b and the sector antenna 11c and the multiplexer / demultiplexer 22c are respectively integrated.

[0010] Transmitters 4A, 4B and 4C, receiver 4
a, 4b and 4c are arranged below the antenna installation body 2. The upper surface of the antenna installation body 2 is generally arranged at a position relatively higher than the ground. An antenna support 21 such as a pole is provided at positions P, Q and R on the upper surface of the antenna installation body 2.
Set up P, 21Q and 21R. Sector antenna 1
1A (and multiplexer / demultiplexer 22A) and sector antenna 11
b (and the multiplexer / demultiplexer 22b) are connected to the antenna support column 21Q.
As described above. Similarly, the sector antenna 11B (and the multiplexer / demultiplexer 22B)
And the sector antenna 11c (and the multiplexer / demultiplexer 22c) are mounted on the antenna support column 21R.
(And the multiplexer / demultiplexer 22C) and the sector antenna 11a
(And the multiplexer / demultiplexer 22a) are attached to the antenna support column 21P in a rear combination.

Next, the sector antenna 11C (and the integrated multiplexer / demultiplexer 22C) and the sector antenna 11a
A typical example of the installation of the (and the integrated multiplexer / demultiplexer 22a) to the antenna support column 21P will be described.
The sector antennas 11C and 11a, which cover the sector cells C and a in different directions from each other, are arranged back-to-back on a pole-shaped antenna support column 21P that stands vertically on the antenna installation body 2 from the ground. The end is fixed to the antenna support column 21P by a mounting bracket. In this configuration, an open / close arm type downtilt bracket is additionally installed between the sector antennas 11C and 11a and the mounting bracket, and by adjusting the arm angle of the downtilt bracket, the beam of the sector antennas 11C and 11a is adjusted. Adjust / change the tilting angle. Also, antennas 11C and 11a
The adjustment of the main beam azimuth angle direction is performed with the antenna mounting bracket loosened or the antennas 11C and 11a removed from the antenna support column 21P.

[0012]

The above-mentioned rear combined sector antenna of the base station apparatus comprises a transmitting sector antenna and a receiving sector antenna which cover sector cells having different azimuthal directions with respect to the base station. Since the antennas are arranged almost integrally on the side, the effect of limiting the number of installed antennas to only the number of sector cells is produced, and the construction period, construction members and installation space for antenna installation can be reduced.

[0013] However, the sector antenna in the base station apparatus is used to adjust or change the main beam directing direction and the beam tilting angle in order to take measures against the same frequency interference that is designed or to obtain an expected value of the service area quality of effective frequency utilization. In addition, there has been the inconvenience that it is necessary to remove the sector antenna from the antenna support column and to disconnect the transmitter output and the receiver input of the base station each time the above-mentioned change or adjustment is performed.

Accordingly, an object of the present invention is to easily adjust / change the main beam directing direction and beam tilting angle of a sector antenna, and to construct / maintain / optimize a sector antenna in a base station of a cellular mobile communication system. It is an object of the present invention to provide a backside combination sector antenna device which can make work easier, more efficient and more economical.

[0015]

According to the present invention, a transmitting sector antenna and a receiving sector antenna which cover sector cells having different azimuthal directions with respect to a base station are arranged on the back side of each other. In the rear combined sector antenna device to be arranged, the transmitting sector antenna and the receiving sector antenna arranged on the back side are housed in the same radome, and the cylindrical antenna has a cylindrical outer surface that is vertically elongated from the ground. Azimuth control means for changing the azimuth directing directions of the transmitting sector antenna and the receiving sector antenna by an operation from the outer surface of the antenna container without changing the disposition and disassembly of the antenna container; Change of arrangement and minutes of the antenna container None, and a tilt angle control means for changing respective tilt angles of the transmitting sector antennas and the reception sector antenna by operation from the external surface of the antenna container.

A first one of the rear combined sector antenna devices is a reflector antenna in which the transmitting sector antenna and the receiving sector antenna are arranged in a plurality of radiating elements arranged so as to be vertically continuous from the ground. Each of the tilt angle control means, a tilt angle operation unit disposed on the outer surface of the antenna housing,
A feed phase variable circuit that is housed in the antenna housing and that changes a feed phase to each of the plurality of radiating elements to a predetermined phase in response to a control instruction from the tilt angle operation unit can be adopted. .

The second of the combined sector antenna devices
Is a reflector antenna in which the transmitting sector antenna and the receiving sector antenna are provided with a reflector having an opening surface substantially perpendicular to the ground, and each of the azimuth control means is provided on the back surface of the reflector. A first gear that is provided and has a rotation axis that is a vertical axis from the ground;
A power transmission rotary shaft that is housed in the antenna housing and rotates the first gear by a rotation operation from the outer surface of the antenna housing can be provided.

A third aspect of the rear combination sector antenna device is that the sector cell comprises three sector cells whose azimuthal directions are different from each other by approximately 120 ° with respect to the base station, and the antenna accommodating unit includes the transmitting sector antenna. And the receiving sector antenna are accommodated one by one.

A fourth aspect of the rear combination sector antenna device is that the sector cell is composed of three sector cells whose azimuth directions are different from each other by approximately 120 ° with respect to the base station, and the antenna accommodating unit is oriented with respect to the base station. Two receiving sector antennas for receiving radio waves from the same sector cell in the same angular direction, and a transmitting sector antenna for emitting radio waves to the sector cell having an azimuth angle direction different from the receiving sector antenna with respect to the base station. A configuration for accommodating the sector antenna can be adopted.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a base station of a mobile communication system to which one of the embodiments according to the present invention is applied. Also,
FIG. 2 is a structural diagram of the combination antenna 1P of FIG.
(A) is a side view, (b) is a cross-sectional view taken along the line B1-B2 of (a), and (c) is a view of the bottom surface of the combination antenna 1P from the line A1-A2.

The base station of FIG. 1 includes transmitters 1A, 1B and 1C having the same configuration and function as the base station of FIG.
And a combination antenna 1P in place of the pair of sector antenna 11C and sector antenna 11a, and a combination antenna 1Q in place of the pair of sector antenna 11A and sector antenna 11b.
To sector antenna 11B and sector antenna 1
A combination antenna 1R is provided instead of the pair 1c. Combination antenna 1P is composed of frame 17 and circuit housing 1
6 and includes an antenna housing having a cylindrical outer surface that is vertically elongated from the ground. Combination antennas 1Q and 1R also include similar antenna housings. In addition, the frame 17 is made of plastics with little radio wave loss. The bottom surface (the surface close to the ground) of the antenna housing of the combined antenna 1P is fixed to the tip of a pole-shaped antenna support 15P that is set up near point P of the antenna installation body 2. Similarly, the bottom surface of the antenna housing of combination antenna 1Q and the bottom surface of the antenna housing of combination antenna 1R are also fixed to antenna supports 15Q and 15R, respectively.

Since the combination antennas 1P, 1Q and 1R differ only in the installation location and the sector cell to be covered, the combination antenna 1P will be mainly described below. The combination antenna 1P includes a sector antenna unit 1PC including the sector antenna 11C in FIG. 8 and a sector antenna unit 1Pa including the sector antenna 11a in FIG. The sector antenna unit 1PC further includes an azimuth angle control mechanism (AZC) 12C, a tilt angle control unit 13C, and an operation unit 14C. Sector antenna 1P
a further includes an azimuth angle control mechanism (AZC) 12a, a tilt angle control unit 13a, and an operation unit 14a. Since the sector antenna units 12C and 12a differ only in the installation location and the sector cell to be covered, the sector antenna unit 1PC will be mainly described below.

The sector antenna unit 1PC has an operation unit 1 having an operation surface on the bottom surface, which is one of the outer surfaces of the circuit housing unit 16.
The tilt angle θt of the sector antenna 11C and the azimuth directivity of the main beam in the sector cell C are changed and adjusted according to an operation instruction from the 4C. That is, the operation unit 14C
The tilt angle θt is changed by operating the tilt angle operation unit 14C1, and the azimuth pointing direction is changed by operating the AZ operation unit 14C2. When an operation instruction is issued by the tilt angle operation unit 14C1, the tilt angle control unit 13C responds to the control instruction of the tilt angle operation unit 14C1 to respond to the control instruction of the tilt angle operation unit 14C1.
C tilt angle control is performed. That is, the tilt angle control unit 13C
Changes the phases of transmission signals supplied from the transmitter 4C to the plurality of radiating elements of the sector antenna 11C to predetermined phases via the RF connector 18C and the tilt angle control unit 13C. The predetermined feeding phase is a phase at which a predetermined tilt angle θt is obtained for the main beam of the sector antenna having the array configuration, and is determined by using a well-known beam forming technique for the array antenna. When the AZ operation unit 14C2 is operated, the azimuth control mechanism 12C changes the azimuth direction of the main beam of the sector antenna 14C in the vicinity of the sector cell C.

The cylindrical circuit housing 16 arranged on the ground side of the antenna housing includes operation units 14C and 14a.
And a large part of the tilt angle control units 13C and 13a, and is connected to an upper part of the circuit housing unit 16 in a cylindrical body 1.
7 accommodates most of the sector antennas 11C and 11a and the azimuth control mechanisms 12C and 12a. An antenna supporting column 15P is fixed to the center of the bottom surface of the circuit housing 16. The frame 17 includes a cylindrical cover-shaped radome portion 171 and an inner portion of the radome portion 171 which is wide from the ground in the vertical direction.
And a partition-shaped core portion 172. The sector antenna 11C is disposed in one of the spaces formed by the radome portion 171 and the core portion 172, and the sector antenna 11a is disposed in another space formed by the radome portion 171 and the core portion 172 on the back surface of the reflector (see FIG. The direction opposite to the sector cell a) is disposed on the back surface of the reflector 115 of the sector antenna 11C. Reflector 115 of sector antenna 11C
Point the opening surface in the direction of the sector cell C (in a plane perpendicular to the ground). In addition, a plurality of radiating elements such as the radiating element 113 are arranged in the direction of the sector cell C in such a manner as to be continuous with the two reflectors 115 of the sector antenna 11C in the direction perpendicular to the ground.

Two reflectors 1 of sector antenna 11C
An azimuth control mechanism 12C for rotating the reflecting surface 115 about the antenna support 15P by rotation of a gear is disposed on the back surface of the joint 15 at the joint. The sector antenna 11a is also rotated by the azimuth control mechanism 12a. The azimuth control mechanisms 12C and 12a
The gear is passed through a hole slightly larger than the diameter of the gear, and is restrained by the core 172.

The operation surface of the operation unit 14C occupies approximately half the area of the bottom surface of the circuit housing unit 16. Tilt angle operation unit 14
The operation surface for C1 includes a dip switch 141C and a set switch S14C. DIP switch 141C
Can be controlled by 4 bits. By operating the switch 141, the tilt angle θt of the sector antenna 11C is controlled. When the set switch S14C is turned on, the dip switch 141C is activated. AZ operation unit 14
C2 includes a jig receiver 127C. When the jig receiver 127C is rotated, the azimuth control mechanism 11C receives this rotation and rotates the reflecting plate 115. A reflector 11 is provided on the operation surface.
An AZ display 19C indicating the rotation angle of 5, that is, the main beam directing direction of the sector antenna 11C is also provided, and an appropriate display is provided for convenient operation. Operation unit 14a
Also has the same configuration as the operation unit 14C, and includes a DIP switch 141a, a set switch S14a, a jig receiver 127a, and an AZ display 19a on the operation surface. The tilt angle control units 13C and 13C are provided on the bottom of the circuit housing unit 16.
Power supply terminal 20 for supplying power to 2a, RF connector 18 for supplying a transmission signal to sector antenna 11C
C, the receiver 3 receives the signal from the sector antenna 11a.
a is provided with an RF connector 18a for outputting a signal.

FIG. 3 is a detailed block diagram of a portion for controlling the tilt angle of the sector antenna 11C of FIG.

The sector antenna 11C has four radiating elements 111 and 11 arranged at equal intervals d in the vertical direction from the ground.
An array antenna including 2, 113 and 114. When a transmission signal of the same phase is supplied with equal amplitude to these radiating elements 111 to 114, the tilt angle θt becomes 0 °. Further, when the transmission signal is sequentially supplied to the radiating elements 111 to 114 with the phase delay difference φ, the tilt angle θt becomes ta
The angle is calculated by n (θt) = φ / (βd). Here, β is a phase constant. When the phase delay difference φ is formed by the line difference ΔL of the transmission signal propagation wavelength λ, the phase constant β
= 2π / λ, so tan (θt) = ΔL / ｛(2
π / λ) · d｝.

The distributor 135 of the tilt angle control unit 13C includes:
The transmission signal supplied from the RF connector 18C is equally distributed to the phase variable circuits 131, 132, 133 and 134. Phase variable circuits 131, 132, 133 and 1
In response to the tilt angle control signals C1, C2, C3, and C4 from the tilt angle operation unit 141C1, each of the 34 supplies a transmission signal to the radiating elements 111, 112, 113, and 114 at a predetermined power supply phase. Phase variable circuit 13
1, 132, 133 and 134 have the same configuration functions, respectively.
1 will be described.

The variable phase circuit 132 includes a tilt angle controller 1
4C1 receives four parallel tilt angle control signals C1.
The tilt angle control signal C1 controls terminal switching of the four RF switches S13a to S13d. Multiplexer / demultiplexer 1
The transmission signal from the RF switch S13d, S13
c, S13b (S13c and S13b are not shown),
And S13a are sequentially supplied to the radiating element 111. The transmission signal from the multiplexer / demultiplexer 135 is transmitted to the RF switch S1.
The terminal 2 of 3d passes through the line L0, and the terminal 1
d. The transmission signal output to the common terminal of the RF switch S13c is supplied to the RF switch S13c. Hereinafter, the signal is supplied from the common terminal of the preceding RF switch to the terminal 2 of the succeeding RF switch through the line L0, and is supplied to the terminal 1 by the lines Lc and R in the RF switch S13c.
In the F switch S13b, the line Lb and the RF switch S13
In A, it is supplied through the respective lines La. It is appropriate to use a coaxial switch for the RF switch S13i (i indicates any one of a to d) and a coaxial cable or strip line for the lines L0 and Li.

When one tilt angle control signal C1 is "0", the RF switch S13i corresponding to the control signal C1 is connected to the terminal 2, and when the control signal C1 is "1", the RF switch S13i is connected to the terminal 1. Shall be performed. The line length of the line Li is also represented by the same code Li, and L0, La, Lb, L
It is assumed that c and Ld have different lengths. Then 4
The phase variable circuit 13 is controlled by the bit parallel control signal C1.
2 is (4L0, 3L0 + La, 3L0 + L
b, 3L0 + Lc, 3L0 + Ld, 2L0 + La + L
b, 2L0 + Lb + Lc, 2L0 + Lc + Ld, 2L0
+ Ld + La, 2L0 + La + Lc, 2L0 + Lb + L
d, L0 + La + Lb + Lc, L0 + Lb + Lc + L
d, L0 + Lc + Ld + La, L0 + Ld + La + L
b, La + Lb + Lc + Ld). Here, when the desired tilt angle θt is small, La−Lb
= Lb-Lc = Lc-Ld = Ld-L0 = δL, the steps of changing the tilt angle θt can be made substantially the same. Note that all control signals C1 are 0
In order to set the tilt angle θt to 0 ° in the case of
Between the multiplexer / demultiplexer 135 and the phase variable circuits 131 to 134, so that the feeding phases to 1 to 114 are the same.
And phase variable circuits 131 to 134 and radiating element 11
The wiring length between 1 and 114 is appropriately adjusted.

The dip switch 141C of the tilt angle controller 14C1 sends a 4-bit control signal generated by turning on and off the four switches to the phase controller 142. The phase control unit 142 is activated by turning on the set switch S14C. The phase control unit 142 responds to a control signal from the switch 141C to change the phase of the phase variable circuits 131, 132, 13
3 and 134 have the same tilt angle control signals C1, C2,
Send C3 and C4 respectively. The tilt angle display of the dip switch 141C in FIG. 2C is performed by ON / OFF binary display of the dip switch 17,
The change range of the tilt angle θt is set to all switches OFF.
"All switches ON'111 from 0 ° of 0000 '
1 'up to 15 °. FIG. 3 does not show a power supply for supplying power to the phase variable circuits 131 to 134 and the phase control unit 142 and the power supply terminal 20.

FIG. 4 is a perspective view of the azimuth control mechanism 12C and the sector antenna 11C of FIG.

The sector antenna 11C is a reflector antenna having a reflector 115 having an opening surface substantially perpendicular to the ground. Four radiation elements 1 of antenna 11C
11, 112, 113 and 114 are arranged at equal intervals d so as to be continuous from the ground in the vertical direction. The radiating elements 111 to 114 are supplied with transmission signals from the phase variable circuits 131 to 134 through holes (not shown) formed in the reflecting plate 115. On the back surface of the reflecting plate 115, a rotating shaft 123 that is directed vertically from the ground is fixed.
3 are provided with a plurality of gears 124. Gear 1
The gear 122 overlapping the tooth shape with the gear 24 is a power transmission rotary shaft 121.
It is fixed to. The power transmission rotary shaft 121 is also a vertical axis from the ground, and the distal end of the power transmission rotary shaft 121 is connected to a jig receiver 127C whose periphery is exposed on the bottom surface of the circuit housing 16 and has a waveform. Here, the azimuth control mechanism 12C shown in FIG. 1 and FIG.
1, gears 122 and 124, a jig receiver 127C, and a rotating shaft 123 at least.

In order to change the direction of the main beam directivity of the sector antenna 11C, the shaft rotation jig 30 as an accessory is fitted to the jig receiver 127C, and the shaft rotation jig 30 is rotated to change the power transmission rotation. The shaft 121 is manually rotated clockwise or counterclockwise. Then, by the rotation of the gears 122 and 124 coupled to the power transmission rotary shaft 121, the reflector 115 and the radiating elements 111 to 114 coupled to the reflector 115 are rotated within the movable range in the frame 17, and the main body of the antenna 11C is rotated. The beam direction changes according to the rotation amount of the power transmission rotation shaft 121. In addition,
The shaft rotation jig 30 adjusts the rotation diameter of the handle to the jig receiving 12.
7, which is considerably larger than the diameter of the power transmission rotary shaft 1.
21 can be rotated with little force. After the reflector 115 is rotated to a predetermined angle, the rotation angle of the reflector 115 is changed without knowing by a known rotation stopping mechanism such as inserting a pin into the jig receiver 127 or the concave portion of the gear 125. Prevent it from occurring.

The power transmission rotary shaft 121 has a gear 12
5 are further connected. An indicator shaft 128 provided at the tip of the shaft of the gear 125 is connected to an AZ indicator 19C arranged on the bottom surface of the circuit housing 16. Gear 125
Rotates with the power transmission rotary shaft 121, and the gear 12
An AZ indicator 19C coupled to 5 displays a change in direction corresponding to the number of revolutions (amount) of the gear 125. Therefore, the rotation operator of the power transmission rotary shaft 121 is required to
The angle change of the main beam directing direction of C can be confirmed on the outer (bottom) surface of the circuit housing portion 16.

As described above, the rear combined sector antenna device according to one of the embodiments of the present invention can be used without changing the disposition and disassembly of the antenna housing including the frame 17 and the circuit housing 16 and from the antenna supporting column 15P. Therefore, there is an effect that the main beam directing direction and the beam tilting angle can be easily adjusted / changed without removing the base station, and without disconnecting the output of the transmitter 4C or the like of the base station or the input of the receiver 3a. Therefore, the use of the sector antenna apparatus according to the present embodiment has the effect of facilitating, increasing the efficiency and economy of the construction / maintenance / optimization work of the sector antenna in the base station of the cellular mobile communication system. Occurs.

FIG. 5 is a configuration diagram of a base station of a mobile communication system to which another embodiment of the present invention is applied.
FIG. 6 is a layout diagram of the combination antennas 10P, 10Q and 10R of FIG.

The mobile communication system of FIG. 5 is obtained by changing the reception system of the mobile communication system of FIG. 1 to an antenna switching diversity reception system. This mobile communication system requires two pairs of a sector antenna and a receiving circuit for one receiver. Receiver 3a1 for sector cell a
Receives the received signals from the two sector antenna units 1a and 1as via the RF switch S3a for antenna switching, and determines the level of the received signals received by the two sector antenna units 1a and 1as. Note that the sector antenna section to which the suffix s is added is an antenna added as a diversity antenna. After the above-described level determination, the receiver 3a1 receives a call reception signal from the higher-level sector antenna unit. Similarly, the receiver 3b1 for the sector cell b is connected to the RF switch S
The receiver 3c1 for the sector cell c is transmitted from the sector antenna units 1b and 1bs via the RF switch S via the 3b.
The received signals are received from the sector antenna units 1c and 1cs via 3c. Receivers 3a1, 3b1 and 3c1
Performs almost the same operation as the receivers 3a, 3b, and 3c in FIG. 1 except that the switching of the RF switches S3a, S3b, and S3c and the above-described reception signal level determination are performed. The transmitters 4A, 4B and 4C operate in the same manner as those in FIG. Transmitters 4A, 4B and 4C
Supplies a transmission signal to the sector antenna units 1A, 1B and 1C for the sector cells A, B and C, respectively.

In this mobile communication system, three sector antenna sections 1B, 1a and 1cs constitute a combined antenna 10P which is combined in the same manner as shown in FIG. 2 and different from the base station by 120 °. Covers azimuth direction. Similarly, sector antenna sections 1C, 1b and 1as constitute combination antenna 10Q, and sector antenna sections 1A, 1c and 1bs constitute combination antenna 10R. These combined antennas 10P, 10Q, and 10R are housed in one antenna housing, respectively, and are fixed to antenna support columns that stand vertically from the ground at points P, Q, and R on the upper surface of the antenna installation body 2, respectively. You. Also,
Sector antenna units (for example, sector antenna units 1a and 1as) connected to the same receiver are installed so that the radio wave propagation distance from the mobile station of the same sector cell (sector cell a in this example) is as equal as possible. ing.

As described above, the combination antenna 10P
Differs from the combination antenna 1P of FIG. 1 in that it can correspond to the sector cells B, a, and b, respectively. Similarly, combination antenna 10Q can correspond to C, b, and c sector cells, respectively, and combination antenna 10R can correspond to A, a, and c sector cells, respectively.
The tilt angle changing circuit and the azimuth directivity changing mechanism of the combination antennas 10P, 10Q and 10R can be realized by the same technology as the embodiment of FIG.

The rear combination antenna device according to the embodiment of FIG. 5 is characterized in that three sector antenna sections respectively covering three sector cells can be integrated into one combination antenna. This feature indicates that the present invention is suitable for a mobile communication system using an antenna switching diversity reception system which requires twice as many receiving sector antennas as the mobile communication system of FIG. Therefore, in the mobile communication system shown in FIG. 5, the tilt angle and the azimuth directivity of the sector antenna device are adjusted.
Ease of change, and the improvement of construction / maintenance / optimization work of the sector antenna device accompanying these changes shortens the construction period.
The effects such as improvement in economy can be further improved than the mobile communication system of FIG.

[0044]

As described above, the rear combined sector antenna device according to the present invention accommodates the transmitting sector antenna and the receiving sector antenna disposed on the back side of each other in the same radome, and has a cylinder vertically extending from the ground. An antenna container having an outer surface having a shape, and an azimuth directing direction of the transmitting sector antenna and the receiving sector antenna without being changed and disassembled, by operating the antenna container from the outer surface thereof. Azimuth angle control means for changing, and tilt angles for changing the tilt angles of the transmitting sector antenna and the receiving sector antenna by an operation from the outer surface of the antenna housing without changing or disassembling the arrangement of the antenna housing. Control means, the antenna housing Easily change the main beam pointing direction and beam tilting angle without changing the arrangement and disassembly, and without removing from the antenna support column, etc., and without disconnecting the output of the base station transmitter or the input of the receiver. Adjustment
There is an effect that it can be changed. Therefore, when the sector antenna device according to the present invention is used, construction / maintenance / maintenance /
There is an effect that the optimization work can be facilitated, efficient, and economical.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a mobile communication system base station to which one of the embodiments according to the present invention is applied.

FIG. 2 is a structural diagram of a combination antenna 1P of FIG. 1,
(A) is a side view, (b) is a cross-sectional view taken along the line B1-B2 of (a), and (c) is a view of the bottom surface of the combination antenna 1P from the line A1-A2.

FIG. 3 is a detailed block diagram of a portion that performs tilt angle control of a sector antenna 11C of FIG. 1;

FIG. 4 is a perspective view of an azimuth control mechanism 12C and a sector antenna 11C of FIG. 1;

FIG. 5 is a configuration diagram of a base station of a mobile communication system to which another embodiment of the present invention is applied.

6 is a layout diagram of the combination antennas 10P, 10Q and 10R of FIG.

FIG. 7 is an explanatory diagram of a sector antenna arrangement in a base station as an example of the mobile communication system according to the present invention;
(A) is a diagram showing a sector cell configuration, and (b) is a layout diagram of sector antennas.

8 is a configuration diagram of a conventional base station in the mobile communication system of FIG. 7;

[Explanation of symbols]

 1P, 1Q, 1R Combined antenna 1Pa, 1PC Sector antenna section 11a, 11C Sector antenna 111-114 Radiating element 115 Reflector 12a, 12C Azimuth angle control mechanism (AZC) 121 Rotation axis 122, 124, 125, 126 Gear 123 Power transmission Rotation axis 127 Jig receiver 128 Display axis 30 Axis rotation jig 13a, 13C Tilt angle control unit 131-134 Phase variable circuit 135 Demultiplexer L0, La, Ln Strip line S13a, S13n RF switch 14a, 14C Operation unit 14C1 Tilt angle operation unit 141a, 141C Dip switch S14a, S14C Set switch 14C2 AZ operation unit 15P, 15Q, 15R Antenna support column 16 Circuit housing 17 Body 171 Radome 172 Core 18a to 18c, 1 A to 18C RF connector 19a, 19C AZ display 20 Power supply terminal 2 Antenna installation body 22 Wireless zone 3a to 3c, 3a1 to 3c1 Receiver 4A to 4C Transmitter 10P, 10Q, 10R Combined antenna 1as, 1bs, 1cs Sector antenna section S3a, S3b, S3c RF switch

Claims (5)

(57) [Claims] 1. A rear combined sector antenna device in which a transmitting sector antenna and a receiving sector antenna respectively covering sector cells having different azimuthal directions with respect to a base station are arranged on the back side of each other, and are arranged on the back side of each other. The transmitting and receiving sector antennas are housed in the same radome, and the antenna housing has a cylindrical outer surface extending vertically from the ground, and without disposing and disassembling the antenna housing, Azimuth control means for changing the azimuth directing directions of the transmitting sector antenna and the receiving sector antenna by operation from the outer surface of the antenna housing, and the transmitting and receiving antennas without changing the disposition and disassembly of the antenna housing. Credit sector antenna and said receiving sector Rear combination sector antenna device, comprising a tilt angle control means for changing each tilt angle of the antenna by the operation from the outer surface of the antenna container. 2. The reflector antenna, wherein the transmitting sector antenna and the receiving sector antenna are arranged as an array with a plurality of radiating elements arranged so as to be continuous from the ground in a vertical direction, A tilt angle operation unit disposed on the outer surface of the antenna housing, and a power supply phase to the plurality of radiating elements housed in the antenna housing and responding to a control instruction from the tilt angle operation unit. 2. The rear combination sector antenna device according to claim 1, further comprising: a feed phase variable circuit that changes the phase to a predetermined phase. 3. The reflector antenna according to claim 1, wherein the transmitting sector antenna and the receiving sector antenna each include a reflector having an opening surface substantially perpendicular to the ground. A first gear provided on the back surface of the antenna and having a rotation axis extending in a vertical direction from the ground; and a first gear housed in the antenna housing, and rotating the first gear by a rotation operation from an outer surface of the antenna housing. 2. The back-assembled sector antenna device according to claim 1, further comprising a power transmission rotary shaft for causing the power transmission to rotate. 4. The sector cell includes three sector cells whose azimuth directions are different from each other by approximately 120 ° with respect to the base station, and the antenna accommodating unit includes one of the transmitting sector antenna and one of the receiving sector antennas. 2. The back-to-back combined sector antenna device according to claim 1, wherein the back-to-back combined sector antenna devices are accommodated one by one. 5. The sector cell comprises three sector cells whose azimuth directions are different from each other by approximately 120 ° with respect to the base station, and wherein the antenna accommodating unit comprises the sector cells having the same azimuth direction with respect to the base station. Two receiving sector antennas for receiving the respective radio waves, and a transmitting sector antenna for emitting a radio wave to the sector cell having an azimuth angle different from the receiving sector antenna with respect to the base station. 2. The rear combination sector antenna device according to claim 1, wherein: