JPH0537222A - Tilt angle variable type antenna - Google Patents

Abstract

PURPOSE:To easily adjust a tilt angle at site or at a remote location by interposing a phase adjustment device to a post-stage of a distributor for a high frequency signal so as to the number of adjust the phase. CONSTITUTION:An antenna 1 consists of plural elements 2, a high frequency signal fed to the antenna 1 is inputted to a distributer 4 from a feeding terminal 3 and distributed to elements 2. A phase adjustment device 5 is connected to a post-stage of the distributer 4 and the phase of each high frequency signal distributed by the control signal inputted to a control signal input terminal 6 is individually adjusted. That is, since the phase of the high frequency signal fed to each element 2 is individually adjusted by the phase adjustment device 5, it is not required to adjust a change in the length of the connection cable 7 different from a conventional antenna to adjust a tilt angle of the antenna 1. Moreover, the tilt angle is adjusted by inputting a control signal from a remote location to manage easily the antenna 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna used in a mobile communication system, and more particularly to an antenna whose tilt angle can be changed and adjusted.

[0002]

2. Description of the Related Art Conventionally, as an antenna used in a mobile communication system, there is an antenna in which a plurality of elements are arranged to form an antenna. After distributing a high frequency signal from a radio device by a number of elements by a distributor, Each signal is supplied to each element by a connection cable. In this type of antenna, it is necessary to adjust the tilt angle of the antenna in order to secure the optimum service area. Therefore, conventionally, the length of the connection cable connecting the distributor and each element By changing each of them, the phase between the elements of the high frequency signal fed to each element is changed, and by adjusting this phase, the tilt angle of the entire antenna is adjusted.

[0003]

In such a conventional antenna, the adjustment of the tilt angle requires the adjustment of the lengths of a plurality of connecting cables. Therefore, the adjustment is required after the antenna is installed on the site. Difficult to do. Therefore,
After actually installing the antenna, it becomes difficult to adjust the tilt angle to secure the optimum service area,
There is a problem that it is difficult to optimize the mobile communication system.
An object of the present invention is to provide an antenna that can easily adjust the tilt angle at a site or a remote place.

[0004]

In the antenna of the present invention, a phase adjuster is inserted after a distributor for distributing a high frequency signal to a plurality of elements, and the phase of each high frequency signal fed to the element is phased. It is configured so that it can be individually adjusted by the adjuster. The phase adjuster is configured to adjust the phase based on the control signal input to the control signal input terminal.

[0005]

According to the present invention, each tilt of the antenna can be adjusted by controlling the phase adjuster to adjust the phase of the high frequency signal fed to each element. Also, the phase adjuster
The phase can be adjusted by a control signal input from a remote place.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the antenna of the present invention.
The antenna 1 is configured as a multi-element antenna composed of a plurality of elements 2. The high-frequency signal supplied to the antenna 1 is input from the power supply terminal 3 to the distributor 4, where it is distributed to the number of the elements 2. A phase adjuster 5 is connected to a stage subsequent to the distributor 4, and the phase of each high-frequency signal distributed by the control signal input to the control signal input terminal 6 is individually adjusted. Then, each high frequency signal is connected to the connection cable 7
Thus, each element 2 is supplied with power.

According to this configuration, the phase adjuster 5 is controlled by the control signal input to the control signal input terminal 6 to adjust each phase of the plurality of high frequency signals distributed by the distributor 4, The phase of the high frequency signal fed to each element 2 can be adjusted individually. As a result, the tilt angle in the antenna 1 can be adjusted without changing and adjusting the length of the connection cable 7 connected to each element 2.
Therefore, each tilt can be adjusted even after the antenna 1 is installed on the site, and the optimum service area can be secured.

Here, since the control signal can be input to the control signal input terminal 6 from a remote place, the phase adjuster 5 is controlled from a remote place to adjust the phase of the high frequency signal supplied to each element 2. This allows the tilt angle of the antenna to be adjusted remotely.

[0009]

As described above, according to the present invention, the tilt of each antenna can be adjusted by controlling the phase adjuster to adjust the phase of the high-frequency signal fed to each element. The tilt angle can be easily adjusted even after installation, and an optimal service area can be secured. Further, by adjusting the tilt angle by inputting a control signal from a remote place, it is possible to eliminate the need for adjustment work on site and easily manage the antenna.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an antenna of the present invention.

[Explanation of symbols]

1 antenna 2 elements 4 distributors 5 Phase adjuster 6 Control signal input terminal

Claims (2)

[Claims] 1. An antenna in which a plurality of elements are arranged and a high-frequency signal is distributed to each element by a distributor for power supply, and a phase adjuster is inserted after the distributor to supply power to the elements. A tilt angle variable antenna, wherein the phase of each high-frequency signal is adjusted by the phase adjuster. 2. The tilt angle variable antenna according to claim 1, wherein the phase adjuster is configured to perform phase adjustment based on a control signal input to a control signal input terminal.