JPH10112677A - Antenna device for radio communication equipment and diversity control method for the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antenna device for a mobile object radio communication equipment capable of performing high quality communication with the direction of a wide range by simple constitution. SOLUTION: Voltages whose phases are different 90 deg. from each other generated by a 90 deg. hybrid base panel are respectively applied to two monopole antenna elements and directivity like a radial pattern 12 is electrically synthesized to an antenna composed of the two monopole antenna elements. Then, when a power feeding route to the 90 deg. hybrid base panel is switched by a switch and the phases of the application voltages are respectively inverted, the directivity of the antenna is switched to the radial pattern 13 and the directivity is provided almost in all directions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a radio communication device and a diversity control method for the device.

[0002]

2. Description of the Related Art In recent years, with the development of a network environment, the use of various OA devices such as computers, printers, and facsimile machines in offices has increased, and the wiring work between these various OA devices has become a problem. Has become. For this reason, wireless communication using a wireless printer buffer, wireless LAN, or the like for data communication in these devices is in progress.

In recent years, portable terminals, especially small portable terminals having high mobility, are not only after the device is moved,
It is necessary to perform data communication even while the device is moving, and to cope with such wireless communication while the device is moving, it is necessary to perform high-quality wireless communication in a wide range of directions and to some extent. .

[0004]

However, the above-mentioned various OAs
A wireless communication device (hereinafter, referred to as a mobile wireless communication device) used for a device cannot have a fixed communication direction. Therefore, a non-directional antenna such as a dipole antenna in a horizontal plane or a patch antenna or the like is used. Most of the communication is performed using an omnidirectional antenna in all directions, and there is an inconvenience that the quality of communication is low due to the characteristics of the omnidirectional antenna.

Further, when a plurality of antenna elements are provided, the communication state of each antenna element is compared, and so-called diversity control using an antenna in a better communication state for data communication is adopted, the number of antenna elements is reduced. In general, a polarization diversity system or a space diversity system, which simply increases the number of antennas, is used. It is necessary to add a reflector, a waveguide element, etc. to the antenna, which leads to an increase in the size and cost of the device. This is because the diversity control used was practically difficult.

Therefore, conventionally, a mobile radio communication apparatus employing so-called diversity control also has a disadvantage that communication quality is low because an omnidirectional antenna is used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an antenna device for a radio communication device capable of performing high-quality communication in a wide range of directions with a simple configuration. .

[0008]

In order to achieve the above object, according to the present invention, there is provided an antenna means comprising two antenna elements, and an antenna for electrically combining directivity with the antenna means. A wireless communication device comprising: an applying unit that applies voltages having phases different from each other by a predetermined angle to each antenna element of the antenna unit; and an inverting unit that inverts the phase of the voltage applied by the applying unit. An antenna device is provided.

According to a second aspect of the present invention, in the antenna device for a wireless communication device according to the first aspect, there is provided monitoring means for monitoring a state of communication by the antenna means,
The inverting means inverts the phases of the voltages when the state of communication monitored by the monitoring means deteriorates.

According to a third aspect of the present invention, in the antenna device for a wireless communication device according to the first or second aspect, the applying means comprises a 90 ° hybrid circuit that generates voltages having phases different from each other by 90 °. It is characterized by.

[0011] Further, the invention according to claim 4 is characterized in that:
3. The antenna device for a wireless communication device according to claim 3, wherein two antenna elements of said antenna means are disposed at a distance of about 1/2 to 3/4 of a wavelength of a carrier wave, and said antenna means Is characterized by forming a radiation pattern having directional beams in three directions.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a schematic configuration of an antenna device for a wireless communication device according to an embodiment of the present invention.

As shown in FIG. 1, an antenna device 1 mainly includes first and second monopole antenna elements 2 and 3 and a 90 ° hybrid board 4, and includes first and second monopole antennas. Electric power is supplied to the elements 2 and 3 by the power supply cable 10.

The first and second monopole antenna elements 2 and 3 each have an axial length of 1/4 of the wavelength λ of the carrier wave, and have one ends parallel to each other at an interval of 3/4 of the wavelength λ. It is fixed to the ground plane of the 90 ° hybrid board 2.

Next, the 90 ° hybrid board 4 will be described with reference to FIG. FIG. 2 is a diagram illustrating a power supply line surface (a back surface of the ground surface) of the 90 ° hybrid board 4.

In FIG. 1, reference numeral 11 denotes a rectangular 90 ° hybrid line. The 90 ° hybrid line 11 has first and second input terminals 7 and 8, and the first and second input terminals 7 and 8 are connected to a power supply cable 10 via a switch 9.

The 90 ° hybrid line 11 is a first hybrid line.
And the first and second output terminals 5, 6 are connected to the first and second monopole antenna elements 2, 3, respectively, on the ground plane of the 90 ° hybrid board 4. Is connected to one end face of.

The 90 ° hybrid line 11 is a circuit for generating voltages whose phases are different from each other by 90 °. Each of the generated voltages is supplied to the first and second output terminals 5 and 6 for the first voltage. And second monopole antenna elements 2 and 3
Respectively. By applying voltages having a phase difference of 90 ° to the monopole antenna elements 2 and 3 respectively, the two monopole antenna elements 2 and 3 can function as one antenna having directivity.

The switch 9 is a 90 ° hybrid line 1
1 is a switch for switching the power supply path to the first and second input terminals 7 and 8. By switching the power supply path, the power supply to the first and second monopole antenna elements 2 and 3 is applied. The phase of each voltage can be inverted.

The switch 9 has a diversity function of comparing the communication states of the first and second monopole antenna elements 2 and 3 to use an antenna in a better communication state for communication. Is inverted.

Next, a specific operation of the antenna device 1 will be described with reference to FIG. FIG. 3 is a radiation pattern diagram based on a measurement result of directivity of the antenna device 1 on a horizontal plane.

In FIG. 1, a first radiation pattern 12 indicated by a thick solid line is a radiation pattern of the antenna device 1 when the power supply path to the 90 ° hybrid line 11 is the first input terminal 7. As described above, by applying voltages having phases different from each other by 90 ° to the first and second monopole antenna elements 2 and 3, the directivity of the antenna device 1 becomes
A radiation pattern having beams in three directions in the horizontal plane.

In the figure, a second radiation pattern 13 indicated by a broken line represents an antenna device 1 in the case where the feed path to the 90 ° hybrid line 11 is switched from the first input terminal 7 to the second input terminal 8. Is the radiation pattern. In this case, since the phase of each voltage applied to the first and second monopole antenna elements 2 and 3 is inverted from the phase in the case of the first radiation pattern 12, the directivity of the antenna device 1 is ,
The beams in the three directions become radiation patterns arranged to make up the valleys of the first radiation pattern 12.

As described above, according to the antenna apparatus for a mobile radio communication device of the present embodiment, the phases generated by 90 ° hybrid line 11 are mutually 90 °.
° By applying different voltages to the two dipole antenna elements 2 and 3, it is possible to electrically synthesize the radiation pattern directivity such that the antenna device 1 has beams in three directions in a horizontal plane.

Also, by switching the power supply path to the 90 ° hybrid line 11 by the switching operation of the switch 9, the phases of the voltages applied to the dipole antenna elements 2 and 3 are respectively inverted, and the directivity of the radiation pattern is improved. As a result, the radiation pattern both before and after the switching of the switch 9 makes it possible to have directivity in almost all directions in the horizontal plane, so that the beam is narrowed to some extent in the communication direction. Diversity control using a plurality of antennas can be performed with a simple configuration.

In the above embodiment, the distance between the dipole antenna elements 2 and 3 is set to ／ of the wavelength λ. However, the distance is not limited to this, and the phase difference between the applied voltages is 90 °. If there is, the element interval is set to 1/2 to 3 of the carrier wavelength λ.
By setting / 4, the directivity of the antenna device 1 can be a radiation pattern having beams in three directions in a horizontal plane.

If the element spacing is set to 3/4 or more of the carrier wavelength λ, the directivity of the antenna device 1 can be a radiation pattern having beams in four or more directions in a horizontal plane.

Furthermore, in the above embodiment, a monopole antenna element was used as the antenna element.
The same effect can be achieved by using two omnidirectional antenna elements in a horizontal plane.

[0030]

According to the antenna device for a wireless communication apparatus according to the first aspect, each of the antenna elements of the antenna means is provided because the applying means electrically combines the directivity with the antenna means composed of two antenna elements. Are applied with voltages different from each other by a predetermined angle, and the inverting means inverts the phase of the voltage applied by the applying means.
An antenna device capable of performing high-quality communication in a wide range of directions can be provided.

Further, according to the antenna device for a wireless communication apparatus of the present invention, there is provided a monitoring means for monitoring a state of communication by the antenna means, and the reversing means is a communication state monitored by the monitoring means. Since the phases of the voltages are respectively inverted when the signal quality deteriorates, the directivity of the antenna means can be switched according to the change in the communication direction.

Further, according to the antenna device for a wireless communication device according to the third aspect, the application units have a phase of 90 degrees with each other.
Since it is composed of a 90 ° hybrid circuit that generates different voltages, the directivity can be electrically combined with the antenna means with a simple configuration.

According to the antenna device for a radio communication device of the present invention, the two antenna elements of the antenna means are arranged at a distance of about 1/2 to 3/4 of the carrier wavelength, and Since the directivity electrically combined with the antenna means forms a radiation pattern having directional beams in three directions, high-quality communication in a wide range of directions becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic configuration of an antenna device for a wireless communication device according to an embodiment of the present invention.

FIG. 2 is a plan view showing a schematic configuration of a feed line surface of a 90 ° hybrid board of the device of FIG. 1;

FIG. 3 is a radiation pattern diagram of the apparatus of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Antenna device 2, 3 1st and 2nd monopole antenna element 4 90 degree hybrid board 5, 6 Output terminal 7, 8 Input terminal 10 Feeding cable

Claims (5)

[Claims] An antenna means comprising two antenna elements, and an application means for applying voltages having phases different from each other by a predetermined angle to each antenna element of the antenna means in order to electrically combine directivity with the antenna means. And an inverting means for inverting the phase of the voltage applied by the applying means, respectively. 2. A monitoring means for monitoring a state of communication by the antenna means, wherein the inverting means inverts the phase of the voltage when the state of communication monitored by the monitoring means deteriorates. The antenna device for a wireless communication device according to claim 1. 3. The antenna device for a wireless communication device according to claim 1, wherein said application means comprises a 90 ° hybrid circuit that generates voltages having phases different from each other by 90 °. 4. The two antenna elements of the antenna means are arranged at a distance of about 1/2 to 3/4 of the wavelength of a carrier wave, and the directivity electrically combined with the antenna means is three directions. The antenna device for a wireless communication device according to claim 1, wherein a radiation pattern having a directional beam is formed. 5. A diversity control method for an antenna device provided with antenna means comprising two antenna elements, wherein each antenna element of said antenna means has a phase in order to electrically combine directivity with said antenna means. A diversity control method for an antenna device for a wireless communication device, comprising: an applying step of applying voltages different from each other by a predetermined angle; and an inverting step of inverting phases of voltages applied in the applying step.