JP2500464B2 - Antenna device - Google Patents

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 performing transmission and reception using different frequencies, and in particular makes it possible to optimally set the directivity of a transmission antenna and a reception antenna. The present invention relates to an antenna device.

[0002]

2. Description of the Related Art In an apparatus for performing transmission and reception using different frequencies, a transmission antenna and a reception antenna are separately provided. For example, when performing communication such as MSAT where there is a difference of 100 MHz between the transmission frequency of 1.6 GHz band and the reception frequency of 1.5 GHz band,
Since it is difficult to share the antennas for transmission and reception, independent antennas are required. When independent antennas are used, it is preferable to set each antenna to have an optimum directivity, that is, to make the directivity of each antenna for transmission and reception match. For example, as shown in FIG.
In the SAT communication device, helical antenna devices are used for the transmitting antenna 10 and the receiving antenna 20, respectively. In this helical antenna device, a helical antenna conductor (hereinafter, simply referred to as a helical antenna) 31 in which a conductor wire is formed in a spiral shape is housed in a dielectric cylinder 30. Then, the rotation operation portion 33 provided in a part of the dielectric cylinder 30 is made to be rotatable with respect to the main body portion 32, the lower end portion of the helical antenna 31 is supported by the main body portion 32, and the upper end portion is rotated. It is connected to the operation unit 33.

Therefore, by rotationally operating the rotary operating portion 33, a rotational force is applied to the helical antenna 31 so that it is twisted and deformed, and as shown schematically in FIG.
The helical pitch S and the helical length L of the helical antenna 31 can be changed. As is well known, since the directivity, especially the elevation directivity of the helical antenna is changed by the helical pitch and the helical length, the rotary operation unit 33
The directivity can be changed and adjusted by the operation of. Therefore, it is possible to adjust each of the transmitting antenna 10 and the receiving antenna 20 so as to have the optimum directivity.

[0004]

By the way, when the communication device using separate antennas for transmission and reception is, for example, a communication station of MSAT as shown in FIG. 3, the direction of the reception antenna 20 is changed. The sex can be set by monitoring the reception state in the communication device 1 and making the reception state the best state. However, the directivity of the transmitting antenna 10 must be determined by the reception state of the satellite 2, and for that purpose, there is no choice but to use an indirect method such as receiving a return signal from the satellite 2 for transmitting. There is a problem that it is difficult to optimally set the directivity of the antenna 10 and the setting operation becomes extremely troublesome. An object of the present invention is to provide an antenna device capable of setting the transmitting antenna and the receiving antenna to the optimum directivity with a simple operation.

[0005]

In the antenna device of the present invention, the transmitting antenna and the receiving antenna that use different frequencies are provided with scales whose directivities correspond to each other, and are set to an optimum receiving state. It is configured so that the scale of the transmitting antenna can be matched with the scale of the receiving antenna. For example, each of the transmitting antenna and the receiving antenna is composed of a helical antenna, the helical pitch and the helical length of each helical antenna can be adjusted, and each antenna has a scale of an adjustment amount corresponding to the change amount of its directivity. The corresponding scales of the transmitting and receiving antennas are provided with corresponding symbols. In the helical antenna, a dielectric cylinder that houses the antenna is divided in the axial direction to form a main body and a rotation operation unit, one end of the helical antenna is supported by the main body, and the other end is supported by the rotation operation unit. The helical antenna is twisted and deformed by rotating the rotating operation unit to change the helical pitch and the helical length, and a scale indicating a rotation amount of the rotating operation unit corresponding to the change is provided.

[0006]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram of an embodiment in which the present invention is installed in an MSAT communication station. The communication device 1 capable of transmission / reception has a different transmission frequency and reception frequency, a transmission antenna 10 and a reception antenna 20 are separately provided, and communication is performed with the satellite 2. The transmitting antenna 1
0 and the receiving antenna 20 are both configured by a helical antenna device. FIG. 2 shows an example of the structure of these helical antenna devices. A helical antenna 31 in which a conductor wire is formed in a spiral shape is provided inside a vertically elongated elongated dielectric tube 30. The dielectric cylinder 30 is divided into an axial direction and is composed of a main body portion 32 and a rotation operation portion 33. The rotation operation portion 33 is configured to be rotatable about the main body portion 32 in the axial direction. ing.

In this embodiment, the protrusion 33a provided on the inner surface of the rotary operation portion 33 is fitted into the L-shaped groove 32a extending in the circumferential direction provided on the main body portion 32, whereby the rotary operation portion 33 is formed.
Is configured to be rotatable with respect to the main body portion 32 at a required angle. Further, the lower end portion of the helical antenna 31 is supported by the main body portion 32, the upper end portion is connected and supported by the rotation operation portion 33, and when the rotation operation portion 33 is rotationally operated, the rotational force is transmitted to the helical antenna 31. The helical antenna 31 is twisted, and its helical pitch S
And the helical length L is changed.

Therefore, by rotating the rotary operation portion 33 by a required angle, the helical pitch S and the helical length L are increased.
Can be changed to adjust the directivity of the helical antenna, here the elevation angle α with respect to the satellite 2. In this case, a scale 34 and a symbol 35 for displaying the rotation angle with respect to the main body are attached to the peripheral surface of the rotation operation part 33. An index 36 is attached to the corresponding peripheral surface position of the main body 32. That is, the helical pitch S and the helical length L of the helical antenna 31 are changed according to the rotation angle of the rotary operation unit 33, and the directivity is made different by the change in these lengths, so that the index 36, the scale 34, and the symbol 35 are changed. By referring to the change amount of directivity, the rotation operation unit 3
It is possible to obtain the directivity of the helical antenna according to the rotation angle of the rotary operation unit 33 by appropriately determining the symbol 35 for the scale 34.

Here, the transmitting antenna 10 and the receiving antenna 20 have a helical pitch S and a helical length L of the respective helical antennas 31 depending on the frequencies used.
Are configured differently. As described above, when the frequency of each helical antenna is different, the helical pitch and the helical length are also different.
Changes in directivity due to changes in the rotation angle and the corresponding helical pitch and helical length, and the intervals between the scales 34 provided on the rotary operation unit 33 also naturally change. Therefore, the rotating antennas of the transmitting antenna 10 and the receiving antenna 20 are provided with their own scales at different intervals. However, as for the symbol indicating the amount of change in the directivity of each antenna, the same symbol 35 is described correspondingly on each corresponding scale 34.

Therefore, in this communication station, first, the signal from the satellite 2 is received by the receiving antenna 20 and the communication device 1.
Then, the rotation operation section 33 of the receiving antenna 20 is rotated to adjust the directivity thereof so that the reception state becomes the best. Thereby, the receiving antenna 20 can be set to have an optimum directivity with respect to the satellite. After that, the scale 34 and the symbol 35 shown on the rotary operation unit 33 are confirmed with the index 36, and the same scale and symbol are displayed on the transmit antenna 10 as indicated by the index 36 on the rotary operation unit 33 of the transmit antenna 10. The rotation operation unit 33 of is operated.

Since the scale 34 and the symbol 35 of the rotary operation portion 33 of the transmitting antenna 10 are formed so as to correspond to the directivity of the receiving antenna 20, the scale 34 and the symbol 35 for receiving are set. It is possible to set the transmitting antenna 10 to have an optimum directivity with respect to the satellite 2 simply by matching it with that of the antenna 20. For this reason, the transmitting antenna 1 is receiving the return signal from the satellite 2.
The operation of setting the directivity of 0 is unnecessary, and the setting can be performed easily and with high accuracy.

In the above embodiment, the present invention is applied to a helical antenna. However, in a communication device that uses individual antennas by using different frequencies for transmission and reception, some of them are adjusted for directivity. In the case of using an antenna whose characteristics can be changed, the present invention can be similarly applied by providing scales and the like corresponding to the transmitting antenna and the receiving antenna.

[0013]

As described above, according to the present invention, the transmitting antenna and the receiving antenna, which use different frequencies, are provided with scales having directivities corresponding to each other, and the directivity is adjusted by using the scales. Since it is configured so that the receiving antenna directivity is set so as to obtain the optimum receiving state while monitoring the receiving state, the scale of the transmitting antenna is made to match the scale indicated by the receiving antenna. Thus, the directivity of the transmitting antenna can be set to the optimum state, and the directivity of the antenna device can be set extremely easily. Also, if the transmitting antenna and the receiving antenna are each composed of a helical antenna, the helical pitch and helical length of each helical antenna can be adjusted, so that its directivity can be changed and adjusted, so that the helical pitch and helical length are adjusted. If you provide a scale of the adjustment amount corresponding to the change amount of directivity in the part to be
By using this scale, it is possible to easily set the directivity of each antenna for transmission and reception.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the overall configuration of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view in which a part of the helical antenna used in FIG. 1 is cut away.

FIG. 3 is a schematic perspective view showing a configuration of a communication station in VSAT.

FIG. 4 is a principle configuration diagram for changing the directivity (elevation angle) of a helical antenna.

[Explanation of symbols]

 1 Communication Device 2 Satellite 10 Transmitting Antenna 20 Receiving Antenna 30 Dielectric Tube 31 Helical Antenna 32 Main Body 33 Rotating Operation Section 34 Scale 35 Symbol 36 Index

Claims (3)

(57) [Claims] 1. An antenna device, which is attached to a communication device for performing communication using different frequencies for transmission and reception, and in which a transmission antenna and a reception antenna whose directivity can be adjusted are individually provided, A scale having directivity corresponding to each of the transmitting antenna and the receiving antenna is provided, and the scale of the transmitting antenna is set to the scale of the receiving antenna that is set to an optimum receiving state. Matched
An antenna device, characterized in that the directivity of a transmitting antenna can be set by setting the transmitting antenna. 2. A transmission antenna and a reception antenna are each constituted by a helical antenna, and the helical pitch and the helical length of each helical antenna can be adjusted, and each antenna has an adjustment amount corresponding to the change amount of its directivity. 2. The antenna device according to claim 1, wherein the scale is provided, and a corresponding symbol is attached to the scale corresponding to each of the transmitting antenna and the receiving antenna. 3. A main body part and a rotation operating part are formed by axially dividing a dielectric cylinder that houses the helical antenna, one end of the helical antenna is supported by the main part, and the other end is a rotating operation part. 2. A rotary scale is supported and the helical antenna is twisted and deformed by rotating the rotary operation part to change the helical pitch and the helical length, and a scale indicating the amount of rotation of the rotary operation part corresponding to the changes is attached. 2 antenna devices.