JPH1153498A - Antenna system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower the cost with simple constitution and to avoid the influence of a multipath by providing a moving means which moves a reflector along the periphery of a plate. SOLUTION: A PCMCIA card package 1 is connected to antennas 2. The antennas 2 are arranged on the plate 3 surrounding the antennas. In a semicircular plate 3, a long guide 6 is arranged. The reflector 9 in a plane or another shape is arranged in the guide 6 with metal or other materials, and this reflector 9 is equipped with a reflection part and a pin 10. The reflector 9 can be moved around the plate 3 along the guide 6. In a normal state, the reflector 9 has an angle 11 to the longitudinal axis of a PCMCIA card. The pin is fixed to a reflection part, and consequently the reflection part rotates on a horizontal axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an antenna device for avoiding the effects of multipath in a PCMCIA card system, and more particularly, to an antenna device used in a wireless communication system.

[0002]

2. Description of the Related Art First, with reference to FIG. 3, an antenna device of this type will be outlined.

[0003] An antenna (AS) 13 is disposed in a cover section 14, which is a PCMCIA card 16.
Rotate around a horizontal axis (A3) 15 fixed to. This allows the antenna to form an angle indicated by reference symbol A4 (17). The PCMCIA card 16 and the antenna 13 are connected via a cable 18 (for example, “Hinged, polarization di
version WLANantenna ", M. Russ
el et al, IEEE MTT-sIntern
national topical symposium
on Technologies for wire
less Applications. 1997 2
Mon, Vancouver).

[0004]

By the way, in the conventional antenna device, the antenna is rotated around the horizontal axis in order to cope with the effect of multipath.
When the connector for connecting the CIA card and the antenna rotates, twisting occurs. Such a twist will sooner or later destroy or break the link between the PCMCIA card and the antenna. That is, in the conventional antenna device, there is a problem that the link between the PCMCIA card and the antenna is broken due to the torsion because the cable is used to connect the PCMCIA card and the antenna.

Further, in the conventional antenna device, since the antenna moves only in one rotation direction, it is difficult to achieve a good reception state. In order to have a good link, the entire package (PC) must be rotated. Must. That is, the conventional antenna device has a problem that it is difficult to deal with the effect of multipath with a standard configuration.

An object of the present invention is to provide an antenna device which can solve the problems of the conventional antenna device and can avoid the influence of multipath.

[0007]

According to the present invention, a PCM is provided.
With an antenna connected to the CIA card package,
A plate on which the antenna is arranged, a reflector,
A moving means for moving the reflector along the periphery of the plate.

The plate is formed in a semicircular shape having a first radius, and the moving means is, for example, a guide formed on the plate and having a second radius so as to surround the antenna. It is.

[0009] The reflector includes a reflecting portion and a pin, and the reflector is disposed in the guide.
The plate is attached to the PCNCIA card at a longitudinal end thereof, the reflector moves along the guide, and the pin is attached to the PCNCIA card.
The reflector is disposed on a horizontal axis parallel to the main surface of the card, and the reflector is rotatable around the pin.

As described above, according to the antenna device of the present invention, first, the antenna is surrounded by the plate and arranged on the plate. This plate is large enough to form a guide. In general,
A plate of uniform size on the surface of the antenna is sufficient. If the transmission and reception paths are affected by multipath and a link is established from the base station to the PCMCIA card, a reflector is placed. The reflector is adjusted to the point where the link is established. The reflector then acts as a blind screen for unwanted passes or enhances one pass by increasing the capture area of the antenna.

[0011]

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

Referring to FIG. 1, a PCMCIA card package (PC) 1 is connected to a plurality of antennas (A1) 2. These antennas 2 are planar or have a printed dipole configuration. These antennas 2 are arranged on a plate (P3) 3 surrounding the antenna, and the thickness (EP) 4 of the plate (P3) 3 is, for example, 2 mm. Plate (P3) 3 is radius (R1)
5 are arranged in a 60 mm semi-circular horizontal plane.
That is, the plate (P3) 3 is formed in a semicircular shape. Long guide (HG) in semicircular plate (P3) 3
6 are arranged. The radius (R2) 7 of this guide is
For example, it is 40 mm, and its width (W1) 8 is, for example, 2 mm. The guide is formed so as to surround the antenna. A planar or other shaped reflector (RF) 9 made of metal or other material is disposed in the guide, and the reflector (RF) 9 includes a reflector and a pin (P) 10.

In the example shown, the reflector has a height of 45.
It is a rectangle with a width of 60 mm. Thereby, the reflector can be moved around the plate (P3) 3 along the guide.

In a normal state, the reflector is a PC
An angle (A1) 11 is formed with respect to the vertical axis of the MCIA card. The pin is fixed to the reflector, which causes the reflector to rotate about a horizontal axis. Then, the reflection portion forms an angle (A2) 12. In a normal state, this angle (A2) 12 is constant and equal to 90 degrees between the horizontal axis and the surface of the reflector.

Referring to FIG. 2, FIG. 2 shows received power when a PCMCIA card is introduced into a PC. The entire PC rotates about a vertical axis. The metal reflector described above is positioned at an angle A1 equal to 45 degrees or 0 degrees.

From the measurement results in a chamber without reflection, it is understood that the influence of the multipath of the PC and the antenna can be changed by the above configuration (see FIG. 2).

[0017]

As described above, the conventional antenna device has a problem in the connector for connecting the antenna and the front-end transceiver as a result of rotating the antenna around the axis in order to suppress multipath. This type of connection is difficult and expensive to place in a suitable location. The present invention provides a simple mechanism to rotate the fixed connection around the antenna without instability, so that not only the same result is obtained but also the cost is reduced compared to the prior art. be able to. That is, according to the present invention, there is the effect that the cost can be reduced with a simple configuration and the influence of multipath can be avoided.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an antenna structure according to the present invention.

FIG. 2 is a diagram showing power when the position of a reflector is changed in a PCMCIA card.

FIG. 3 is a diagram showing a conventional antenna structure.

[Explanation of symbols]

 2,13 Antenna 1,16 PCMCIA Card 4,5,7,8 Distance 6 Guide 9 Reflector 10 Pin 11,12,17 Angle 14 Cover 15 Axis 18 Cable

Claims (5)

[Claims] 1. An antenna connected to a PCMCIA card package, comprising: a plate on which the antenna is disposed; a reflector; and moving means for moving the reflector around the plate. Antenna device. 2. The antenna device according to claim 1, wherein said plate is formed in a semicircular shape having a first radius. 3. The antenna device according to claim 2, wherein said moving means is a guide formed on said plate and having a second radius and surrounding said antenna. apparatus. 4. The antenna device according to claim 3, wherein the reflector includes a reflector and a pin, and the reflector is disposed in the guide. 5. The antenna device according to claim 4, wherein the plate is attached to the PCNCIA card at a longitudinal end thereof, the reflector moves along the guide, and the pin is The antenna device according to claim 1, wherein the reflector is disposed on a horizontal axis parallel to a main surface of the PCNCIA card, and the reflecting portion is rotatable around the pin.