JP2002026645A - Base station antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a base station antenna that has an entirely small area, loses no appearance and has a small wind receiving area. SOLUTION: The base station antenna has a support and reflecting member 1, 1st group antennas 2 that are placed on an upper face of the support and reflecting member 1 at a prescribed interval on a line and send/receive a radio wave with a 1st frequency band, and 2nd group antennas 3 that are placed on the upper face of the support and reflecting member 1 at a prescribed interval so as to be interposed between the 1st group antennas 2 and send/receive a radio wave with a 2nd frequency band.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base station antenna used for a base station of a portable telephone or a car telephone system.

[0002]

2. Description of the Related Art Conventionally, as a base station antenna, 1.
2. Description of the Related Art There has been known an antenna configured with a wideband antenna element that resonates at two frequencies of a 5 GHz band radio wave and a 2.0 GHz band radio wave. As base station antennas, a first group of antennas arranged in a row on the first support member to transmit and receive radio waves in the 1.5 GHz band, and a 2.0 GHz band arranged in a row on the second support member are arranged. An antenna having a second group of antennas for transmitting and receiving radio waves is known.

[0003]

However, in the former base station antenna, when designing a communication area, a wideband antenna element is used, so that there is a problem that the tilt changes simultaneously. is there. Also,
In the latter latter base station antenna, the first group of antennas and the second group of antennas are arranged on different support members, respectively, so that the entire volume becomes large and the appearance is not preferable, In addition, there is a problem that mounting may not be possible depending on the strength of the installation location due to a large wind receiving area. An object of the present invention is to solve such a problem. That is, an object of the present invention is to provide a base station antenna capable of reducing the whole volume, not deteriorating the aesthetic appearance, and reducing the wind receiving area.

[0004]

According to a first aspect of the present invention, there is provided a support / reflection member made of metal, and a plurality of support / reflection members made of metal. And a first group of antennas for transmitting and receiving radio waves of a first frequency band, and a first group of antennas arranged at predetermined intervals on the upper surface of the supporting and reflecting member so as to be located between the first group of antennas. And a second group of antennas for transmitting and receiving radio waves of two frequency bands. According to a second aspect of the present invention, in the base station antenna according to the first aspect, the first group of antennas comprises a dipole antenna, and the second group of antennas comprises a planar antenna. And

[0005]

Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a base station antenna according to one embodiment of the present invention. FIG. 2 is a schematic plan view showing the base station antenna of FIG. FIG. 3 is a schematic front view showing the base station antenna of FIG. As shown in FIGS. 1 to 3, this base station antenna has a metal supporting and reflecting member 1, a first group of antennas 2 and a second group of antennas 3. Support and reflection member 1
Is formed on a flat reflecting surface whose upper surface reflects radio waves. The first group of antennas 2 are arranged in a row at a predetermined interval on the upper surface of the supporting and reflecting member 1, and transmit and receive radio waves in a first frequency band. The second group of antennas 3 are arranged at predetermined intervals on the upper surface of the supporting and reflecting member 1 so as to be located between the first group of antennas 2 and transmit and receive radio waves in the second frequency band. The first group of antennas 2 is composed of a dipole antenna. That is, each of the first group of antennas 2 is formed by connecting two first group of antenna elements 2a, each of which is formed of a substantially rectangular annular frame, in a state where they are orthogonal at the center.
The antenna element 2 a is oriented so that its surface is orthogonal to the upper surface of the supporting and reflecting member 1. The central portion of the first group of antenna elements 2a is supported by supporting legs 2b made of a metal member or an insulating member which is fixed to the supporting and reflecting member 1 upright. As shown in FIG. 3, the first group of antenna elements 2a of the first group of antennas 2 have substantially the same height. The second group of antennas 3 is composed of a planar antenna. That is, each of the second group of antennas 3
It is composed of two planar antennas 3a and 3b which are arranged facing each other at a predetermined interval vertically. The planar antenna 3b is arranged above the upper surface of the supporting and reflecting member 1 by a predetermined distance. As shown in FIGS. 1 and 2, the planar antenna 3a is formed in a square. The planar antenna 3b is formed in a substantially rhombus shape having an area larger than the area of the planar antenna 3a. Planar antennas 3a, 3b
Is supported by a supporting leg 3c made of a metal member or an insulating member which is fixed to the supporting and reflecting member 1 upright. As shown in FIG. 3, the second group of antennas 3 is arranged at a lower position than the first group of antennas 2. The second group of antennas 3 has substantially the same height. With this configuration, the base station antenna of the present invention can reduce the overall volume, and can reduce the wind receiving area without deteriorating the aesthetic appearance.

For example, in the above embodiment, the first
The group of antennas 2 is configured to transmit and receive 1.5 GHz band radio waves, and the second group of antennas 3 is configured to transmit and receive 2.0 GHz band radio waves. In this case, since the interval between the second group antennas 3 for the 2.0 GHz band is set with priority, the antenna gain decreases because the interval between the first group antennas 2 for the 1.5 GHz band is not optimal. However, by increasing the numbers of the first group antennas 2 and the second group antennas 3, a predetermined antenna gain can be obtained, and unnecessary radiation such as side lobes can be suppressed. The first
The group of antennas 2 and the second group of antennas 3 are, for example,
The antenna may be configured as a shared antenna for 800 MHz band and 1.5 GHz band radio waves, or as a shared antenna for 800 MHz band and 2.0 GHz band radio waves. Also, the first
The group of antennas 2 is not limited to a dipole antenna, and may be composed of various antennas. Further, the second group of antennas 3 is not limited to a planar antenna, but may be configured by various antennas. Furthermore, the first
The size, height, and position of the group of antennas 2 and the second group of antennas 3 are not limited to the illustrated embodiment.

[0007]

As described above, according to the first and second aspects of the present invention, the first group of antennas for transmitting and receiving radio waves in the first frequency band and the radio waves in the second frequency band are transmitted and received. Since the second group of antennas are arranged in a row on the same supporting and reflecting member, the overall volume can be reduced, and the aesthetic area can be reduced, and the wind receiving area can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a base station antenna according to one embodiment of the present invention.

FIG. 2 is a schematic plan view showing the base station antenna of FIG. 1;

FIG. 3 is a schematic front view showing the base station antenna of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Support / reflection member, 2nd group antenna, 2a 1st group antenna element, 2b support leg, 2nd group antenna, 3a, 3b planar antenna, 3c support leg.

Claims (2)

[Claims] A first supporting / reflecting member made of metal, and a first supporting / reflecting member arranged in a row at a predetermined interval on an upper surface of the supporting / reflecting member;
And a first group of antennas for transmitting and receiving radio waves of the second frequency band, and a second group of antennas arranged at a predetermined interval on the upper surface of the supporting and reflecting member so as to be located between the first group of antennas. A base station antenna, comprising: a second group of antennas for transmitting and receiving radio waves. 2. The base station antenna according to claim 1, wherein said first group of antennas comprises a dipole antenna, and said second group of antennas comprises a planar antenna. antenna.