JPH08163015A - Diversity antenna - Google Patents

Abstract

PURPOSE: To reduce the cost and to make the size small by forming a 1-point loading point to an opposite side of a dipole antenna and fitting a changeover switch for loop interruption respectively to both ends respectively to use the antenna as an antenna having two functions. CONSTITUTION: A feeding point 3 is fitted to a side 2 of a diversity antenna 1, a 1-point loading point 5 is formed to an opposite side 4 in parallel with the one side 2 and switches 6, 7 are fitted to both ends of the one side 2. The antenna 1 is used for two kinds of antennas through ON/OFF of the switches 6, 7. That is, when the diversity antenna is used for a dipole antenna, the switches 6, 7 at both ends are turned off. As a result, the one side 2 of the loop including the feeding point 3 is used for the dipole antenna. On the other hand, when the diversity antenna is used for a loop dipole antenna, the switches 6, 7 at both ends are turned on to form a loop.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diversity antenna used for wireless communication of various devices.

[0002]

2. Description of the Related Art A conventional diversity antenna uses a plurality of antennas to improve the gain while performing switching synthesis.

[0003]

Therefore, in the space diversity, by increasing the number of antennas, the number of feeding points of the antennas increases, which leads to an increase in cost and the size of the entire apparatus. An object of the present invention is to reduce the cost and size of a diversity antenna by configuring it so that one antenna can be used as an antenna having two functions only by switching a switch without increasing the feeding points and the antennas. Is to try.

[0004]

The structure of the diversity antenna according to the present invention is as follows. 1. A diversity antenna in which a loop including a dipole antenna is formed on one side, a loading point is formed on the opposite side of the dipole antenna, and a switch for breaking a loop is attached to each end of the dipole antenna. 2. By connecting a telephone line between the management center and the wireless master unit and a wire between the managed terminal device and the wireless slave unit, the information of the terminal device is wirelessly communicated between the wireless slave unit and the wireless master unit. As an antenna on the side of the wireless main unit,
A loop including a dipole antenna on one side is formed, a loading point is formed on the opposite side of the dipole antenna, and a changeover switch for loop break is attached to each end of the dipole antenna. Management wireless system.

[0005]

When the diversity antenna is used as a dipole antenna, the switches at both ends are turned off. As a result, one side of the loop including the feeding point can be used as a dipole antenna. On the other hand, when used as a loop dipole antenna, the switches at both ends are controlled to be ON to form a loop.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a diversity antenna according to the present invention. Reference numeral 1 denotes a diversity antenna having a structure in which a feeding point 3 is attached to one side 2, a single loading point 5 is formed on an opposite side 4 parallel to the one side, and switches 6 and 7 are attached to both ends of the one side 2. is there. The above antenna can be used as two types of antennas shown in Table 1 by turning on and off the switches 6 and 7.

[0007]

[Table 1]

FIG. 2 shows an example in which the above antenna is used as an antenna of a master unit in an automatic management radio system.
10 is a management center, 11 is a telephone line, and 12 is a T-NC.
U and 13 are wireless master devices, and 1 is an antenna of the wireless master device, and the diversity antenna 1 having the structure shown in FIG. 1 is used. 15 is a wireless cordless handset, 16 is a cordless handset antenna, 17
Is an automatic meter reading gas meter, and 18 is a telephone. In the above-described automatic management wireless system, two antennas are switched and used regardless of whether the slave unit 15 is single or plural. The diversity effect can be obtained by switching between the two antennas regardless of whether the slave unit is single or plural.

[0009]

The effects of the present invention are as follows. a. Since a loop antenna can be used by switching to a dipole type antenna by switching the switch, the antenna has two functions of a loop and a dipole even though it has only one antenna, and therefore it is possible to reduce the size and reduce the equipment cost. . b. By selectively using two types of functions, the handset can switch between two antennas regardless of whether it is single or plural
A diversity effect can be obtained. c. The reliability of telecommunications is improved. Communication is possible even when entering the valley. d. Communication is possible even if the orientation of the antenna changes.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a diversity antenna according to the present invention.

FIG. 2 is an explanatory diagram of an automatic management wireless system.

[Explanation of symbols]

 1 Diversity antenna 2 One side 3 Feed point 4 Opposite side 5 Loading point 6.7 Switch

Claims (2)

[Claims] 1. A diversity antenna in which a loop including a dipole antenna on one side is formed, a single loading point is formed on the opposite side of the dipole antenna, and a changeover switch for breaking the loop is attached to each end of the dipole antenna. . 2. The management center and the wireless master device are connected by a telephone line, and the managed terminal device and the wireless slave device are connected by a wire, whereby the information of the terminal device is wirelessly communicated between the wireless slave device and the wireless master device. In the automatic management radio system, in which the radio master unit and the management center are connected via a telephone line, a loop including a dipole antenna on one side is formed as an antenna on the radio master unit side, and one point is placed on the opposite side of this dipole antenna. An automatic management radio system using a diversity antenna which forms a loading point and is equipped with a switch for breaking a loop at each end of the dipole antenna.