JP2005102013A - Angle adjustment device and adjustment method of wireless lan directional antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an angle adjustment device and an adjustment method of a wireless LAN directional antenna by which angle adjustment of the antenna can be easily performed with a simple construction. <P>SOLUTION: The angle adjustment device 10 of the wireless LAN directional antenna includes a detection part 13 which detects the electric field strength from received signals from the wireless LAN directional antenna 11 which is supported so that it can rotate in the horizontal direction, a conversion part 14 which converts the electric field strength detected by the detection part 13 into sound signals of a frequency corresponding to the electric field strength, a speaker 16 which converts the sound signals converted by the conversion part 14 into sound and an adjustment part 20 which adjusts the angle in the horizontal direction of the directional antenna 11. The angle adjustment device 10 of the wireless LAN directional antenna is constituted for adjusting the angle in the horizontal direction of the directional antenna 11 by its adjustment part 20 in such a manner that the pitch of the sound from the speaker 16 is the highest or the lowest. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for adjusting a horizontal angle of a directional antenna for transmitting and receiving signals in a wireless LAN.

  Conventionally, a directional antenna for transmitting and receiving signals in such a wireless LAN (hereinafter referred to as a wireless LAN directional antenna) has directivity in the horizontal direction. It is necessary to adjust the angle to align the direction in which the transmission / reception sensitivity is maximum with respect to the side antenna.

  In general, such angle adjustment work is performed by manually adjusting the horizontal axis direction of the wireless LAN directional antenna by hand, and visually checking the reception level of the electric field intensity due to the radio wave from the antenna on the opposite side by looking at the level meter of the receiver. By repeating trial and error, the axial direction of the wireless LAN directional antenna is set in the angular direction of the maximum reception level, and the antenna is fixedly held.

  In addition, the angle adjustment device is attached to the wireless LAN directional antenna itself, the angle of the horizontal axis direction of the antenna is adjusted, and the reception level is also visually observed with a level meter, and the angle of the maximum reception level is determined by trial and error. There is also a method of setting the axial direction of the wireless LAN directional antenna in the direction.

However, all of the above-described methods are based on the primitive work of confirming the reception level of the electric field strength due to the radio wave from the antenna on the opposite side by visually observing the level meter of the receiving device. Adjustment work becomes long.
And since the part which depends on an operator's intuition is large, since an error will become comparatively large, it is substantially difficult to perform the exact angle setting of a wireless LAN directional antenna.

Further, when the antenna is installed at a high place, the place where the angle of the antenna is adjusted and the place where the level meter of the receiving device is viewed are separated, so that the antenna can be adjusted to various angles, for example, the antenna The work of confirming the angle by tying a thread or the like is troublesome, and the adjustment work itself is complicated and takes a lot of time.
In addition, an angle adjustment method using laser light is also conceivable. However, in the case of installing an antenna at a high place where it cannot be reached, it becomes difficult to remove the adjustment device after the angle adjustment work. The device cannot be removed.

On the other hand, for example, Patent Document 1 discloses a receiving device with an antenna direction adjustment function.
According to this configuration, a so-called BS broadcast receiving parabola antenna generates a low-frequency signal based on the level of the received signal, and generates a sound by using this low-frequency signal, so that the sound can be output before and after adjustment. By changing, it is possible to check the adjustment state of the antenna direction.

Further, Patent Document 2 discloses a method for adjusting the antenna direction of a wireless reception device.
According to this configuration, sound having a magnitude corresponding to the reception level of the received signal by the antenna is generated, and the direction of the antenna is adjusted so that the sound becomes maximum.

Further, Patent Document 3 discloses a BS tuner that converts the frequency of the AGC voltage of a received signal and outputs sound having a frequency corresponding to the reception level.
According to this configuration, the reception state of the antenna, that is, the adjustment direction of the antenna can be confirmed based on the frequency of the generated sound.
Japanese Utility Model Publication No. 06-058625 JP 2001-077614 A Japanese Patent Laid-Open No. 02-166839

  However, the above-mentioned Patent Document 1 confirms the adjustment state of the antenna direction by changing the sound according to before and after the direction adjustment of the BS parabolic antenna, and is configured to perform the angle adjustment. In addition, the angle of the wireless LAN directional antenna is not adjusted.

  Further, in Patent Document 2 described above, the angle of the antenna can be set in the optimum direction by adjusting the antenna direction so that the sound is maximized. It is difficult to adjust the direction accurately.

  Further, Patent Document 3 described above uses an AGC voltage change due to radio waves received by a BS antenna to generate an audible frequency by a VCO, and confirms the adjustment state of the antenna direction based on the frequency of the voice while checking the antenna direction. Therefore, the present invention cannot be applied to angle adjustment of a directional antenna of a wireless LAN that does not handle an AGC voltage.

  The present invention has been made to solve the above-described problems, and provides an angle adjustment device and an adjustment method for a wireless LAN directional antenna that can easily adjust the angle of the antenna with a simple configuration. With the goal.

  In order to achieve this object, an angle adjustment device for a wireless LAN directional antenna according to claim 1 of the present invention detects an electric field strength from a received signal from a wireless LAN directional antenna supported so as to be rotatable in a horizontal direction. A detection unit; a conversion unit that converts the electric field intensity detected by the detection unit into an audio signal having a frequency corresponding to the electric field intensity; a speaker that converts the audio signal converted by the conversion unit into audio; and An adjustment unit that adjusts the horizontal angle of the directional antenna, and the angle of the directional antenna is adjusted by the adjustment unit based on the sound from the speaker.

  When the wireless LAN directional antenna angle adjustment device has such a configuration, the electric field strength is detected by the detection unit from the received signal received by the wireless LAN directional antenna, and the sound having a frequency corresponding to the electric field strength is detected by the conversion unit. The sound signal is converted into a signal, and the sound signal is generated as sound from the speaker. As a result, the operator adjusts the angle of the wireless LAN directional antenna by the adjustment unit while listening to the sound from the speaker, so that the angle is adjusted when the sound from the speaker becomes the highest or lowest pitch. Exit. As a result, the wireless LAN directional antenna is set to an angle having the highest electric field strength, that is, an angle having directivity with respect to the antenna on the opposite side, so that an accurate angle adjustment of the antenna is performed.

Therefore, according to this configuration, since the pitch of the sound from the speaker represents the electric field strength, the operator does not need to adjust the angle of the antenna while visually observing the reception level as in the prior art. The antenna angle can be easily adjusted by adjusting the angle of the antenna with the adjusting unit while listening to the above sound.
In addition, since there is no need to attach a device for adjusting the angle to the directional antenna itself, the antenna can be easily and in a short time even with a simple configuration and when the directional antenna itself is installed at a high place. The angle can be adjusted.

The angle adjustment device for the wireless LAN directional antenna according to claim 2 is configured such that the detection unit detects an output voltage from the RSSI output of the wireless LAN.
When the angle adjustment device for the wireless LAN directional antenna has such a configuration, the output voltage from the RSSI output of the wireless LAN can be detected as the electric field strength of the received signal received by the wireless LAN directional antenna.

According to a third aspect of the present invention, the angle adjustment device for the wireless LAN directional antenna is configured such that the detection unit is an ISM band RF level meter and outputs a field strength meter signal by detecting the field strength.
When the angle adjustment device for the wireless LAN directional antenna has such a configuration, the electric field intensity meter signal of the ISM band RF level meter can be detected as the electric field intensity of the received signal received by the wireless LAN directional antenna.

The angle adjustment device for a wireless LAN directional antenna according to claim 4 is configured such that the conversion unit generates a voice signal by performing V / F conversion based on a detection signal from the detection unit.
When the angle adjustment device for the wireless LAN directional antenna is configured as described above, the conversion unit easily generates an audio signal having a frequency corresponding to the electric field strength by V / F conversion based on the detection signal from the detection unit. be able to.

The angle adjustment device for a wireless LAN directional antenna according to claim 5 is configured such that the conversion unit generates a high-frequency audio signal as the voltage of the detection signal from the detection unit increases.
When the angle adjustment device for the wireless LAN directional antenna is configured as described above, when the electric field strength is the highest, the sound having the highest pitch is emitted from the speaker.

The angle adjustment apparatus for a wireless LAN directional antenna according to claim 6 is configured such that the conversion unit generates a low-frequency audio signal as the voltage of the detection signal from the detection unit increases.
When the angle adjustment device for the wireless LAN directional antenna has such a configuration, when the electric field strength is the highest, the sound having the lowest pitch is emitted from the speaker.

To achieve the above object, according to the angle adjustment method for a wireless LAN directional antenna according to claim 7 of the present invention, the transmitting antenna on the opposite side is supported by the wireless LAN directional antenna supported so as to be rotatable in the horizontal direction. The transmission signal is received, and the electric field strength is detected from the reception signal received by the directional antenna, and the detected electric field strength is converted into an audio signal having a frequency corresponding to the electric field strength. Is converted into sound by a speaker, and the horizontal angle of the directional antenna is adjusted by the adjusting unit so that the pitch of this sound becomes the highest or lowest based on the sound from the speaker.
The present invention can also be realized as a method for adjusting the angle of a wireless LAN directional antenna.

  Thus, according to the angle adjustment device and adjustment method for a wireless LAN directional antenna according to the present invention, an audio signal having a frequency corresponding to the electric field strength generated by the received signal of the wireless LAN directional antenna is generated and the audio is output from the speaker. As a result, the operator can adjust the angle of the directional antenna by the adjustment unit so that the sound of the highest or lowest pitch is obtained while judging the pitch of the sound from the speaker. Thus, the angle adjustment of the directional antenna can be performed accurately and in a short time.

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

A first embodiment of an angle adjustment device for a wireless LAN directional antenna according to the present invention will be described with reference to FIG.
FIG. 1 is a block diagram illustrating a configuration of an angle adjustment device for a wireless LAN directional antenna according to the present embodiment.

  As shown in FIG. 1, a wireless LAN directional antenna angle adjustment apparatus 10 includes a directional antenna 11, a preamplifier 12, an RF level meter 13 as a detection unit, and a V / F converter 14 as a conversion unit. A speaker amplifier 15, a speaker 16, and an adjustment unit 20 that adjusts the angle of the directional antenna 11 are provided.

The directional antenna 11 is a directional antenna for transmitting and receiving radio waves for a wireless LAN, and transmits beacon radio waves for a wireless LAN with a directional or omnidirectional antenna (not shown) on the opposite side. Send and receive.
In the illustrated case, the directional antenna 11 is configured as a Yagi antenna, and is attached to an upper portion of a vertical support 11a, and is rotated around a vertical axis by the adjusting unit 20 (described later). The angle is adjusted toward a desired direction.
Further, the directional antenna 11 has a received signal connected to a connector 17 via a coaxial cable 11b, and the connector 17 is connected to the input of the preamplifier 12 described above.

The preamplifier 12 amplifies a received signal input from the directional antenna 11 via the coaxial cable 11 b and the connector 17 and inputs the amplified signal to the RF level meter 13.
The RF level meter 13 is an ISM band RF level meter in a wireless LAN, and outputs a field strength meter signal having a voltage corresponding to the field strength of the received signal.

The V / F converter 14 converts the voltage of the electric field strength meter signal from the RF level meter 13 into a frequency, and generates an audio signal having this frequency.
Here, the V / F converter 14 generates an audio signal having a higher frequency as the voltage of the electric field strength meter signal increases.

  The speaker amplifier 15 amplifies the audio signal from the V / F converter 14 and drives the speaker 16. Thereby, sound is emitted from the speaker 16 based on the sound signal of the frequency.

  Therefore, a sound having a frequency corresponding to the electric field strength in the received signal by the directional antenna 11 is emitted from the speaker 16, and the sound becomes a sound having a higher pitch as the electric field strength is higher.

  The adjustment unit 20 adjusts the angle of the directional antenna 11 by rotating the support 11a that supports the directional antenna 11 around the vertical axis, and sets the direction of the directional antenna 11. ing.

Next, the operation of the wireless LAN directional antenna angle adjustment apparatus of this embodiment will be described with reference to the time chart of FIG.
As shown in FIG. 3, the wireless LAN 30 is operated by the terminal 31 to transmit the wireless LAN beacon radio wave by the directional antenna 32 on the opposite side that transmits the radio LAN radio wave. ing.
When the angle adjustment of the directional antenna 11 is performed, a wireless LAN beacon radio wave is transmitted from the directional antenna 32 on the opposite side.

In FIG. 2, in step A <b> 1, a wireless LAN beacon radio wave transmitted from the opposite side is received by the directional antenna 11.
Thereby, in step A2, the received signal of the directional antenna 11 is amplified by the preamplifier 12, and then in step A3, the RF level meter 13 corresponds to the electric field strength based on the amplified received signal. The electric field strength meter signal is output to the V / F converter 14.

Next, in step A4, the V / F converter 14 generates an audio signal having a frequency corresponding to the electric field strength meter signal based on the electric field strength meter signal from the RF level meter 13, and supplies it to the speaker amplifier 15. Output.
Thereby, in step A5, the speaker amplifier 15 drives the speaker 16 based on the audio signal from the V / F converter 14 to generate sound of the frequency.

In response to this, the operator rotates the directional antenna 11 around the vertical axis by operating the adjusting unit 20 while listening to the sound from the speaker 16 in step A6.
At that time, since the electric field strength of the received signal from the directional antenna 11 changes based on the directivity of the directional antenna 11, the frequency of the sound emitted from the speaker 16 corresponds to the change in the electric field strength. Will change, and the pitch of the voice will change.

  In this case, the frequency of the sound converted by the V / F converter 14 is set so as to increase as the electric field strength of the received signal from the directional antenna 11 increases. Based on the directivity of the directional antenna 11, the electric field strength increases and the pitch of the sound from the speaker 16 increases as the directional antenna 32 faces the opposite side.

Therefore, the operator adjusts the angle of the directional antenna 11 by the adjustment unit 20 so that the pitch of the sound emitted from the speaker 16 becomes the highest in step A7. And when the pitch of the sound emitted from the speaker 16 becomes the highest, the directional antenna 11 is fixed and its angle is fixed.
As a result, the directional antenna 11 is angle-adjusted and set in the direction toward the directional antenna 32 on the opposite side so that the electric field strength becomes the highest.

  At this time, the operator can adjust the angle of the directional antenna 11 by simply listening to the pitch of the sound emitted from the speaker 16 without looking at the RF level meter 13. The angle of the directional antenna 11 can be adjusted easily and accurately by a simple operation.

  In this way, for example, when the directional antenna 11 is installed at a high place or the like, the safety in the high place work can be improved by adjusting the angle of the directional antenna 11 in a short time.

  Further, according to the angle adjustment device 10 for the wireless LAN directional antenna, there is no need to attach any device or the like to the directional antenna 11 itself, so that the directional antenna 11 is disposed at a high place or the like. However, the angle adjustment of the directional antenna 11 can be easily performed in a short time.

  In the above-described embodiment, the V / F converter 14 generates an audio signal having a higher frequency as the electric field strength increases. However, the present invention is not limited to this, and the V / F converter 14 has an electric field strength. An audio signal with a lower frequency may be generated as the value increases. In this case, when the angle of the directional antenna 11 is adjusted, the operator may adjust the angle of the directional antenna 11 by the adjusting unit 20 so that the sound from the speaker 16 becomes the lowest pitch. .

  In the above-described embodiment, the ISM band RF level meter, that is, the RF level meter 13 is used as the detection unit. However, the detection unit is not limited to this, and a detection unit that detects an output voltage from the RSSI output of the wireless LAN is provided. You may do it.

Furthermore, in the above-described embodiment, the received signal from the directional antenna 11 is amplified by the preamplifier 12 and then input to the RF level meter 13. However, the present invention is not limited to this, and the preamplifier 12 is omitted. May be.
In the above-described embodiment, the audio signal from the V / F converter 14 is amplified by the speaker amplifier 15 and then input to the speaker 16. May be omitted, and the audio signal from the V / F converter 14 may be directly input to the speaker 16.

  As described above, according to the present invention, it is possible to provide a wireless LAN directional antenna angle adjustment device and adjustment method that can easily adjust the angle of the antenna with a simple configuration.

It is a block diagram which shows the structure of one Embodiment of the angle adjustment apparatus of the wireless LAN directional antenna by this invention. 5 is a flowchart showing an antenna angle adjustment operation by the method of adjusting the angle of a wireless LAN directional antenna according to the present invention. It is a block diagram which shows the antenna angle adjustment state by the beacon electric wave of wireless LAN from the opposite side of the angle adjustment apparatus of the wireless LAN directional antenna shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Angle adjustment apparatus of wireless LAN directional antenna 11 Directional antenna 11a Prop 11b Coaxial cable 12 Preamplifier 13 RF level meter 14 V / F converter 15 Speaker amplifier 16 Speaker 17 Connector 20 Adjustment part 30 Wireless LAN30 (opposite side)
31 Terminal 32 Directional antenna (opposite side)

Claims (7)

A detection unit for detecting electric field strength from a received signal from a wireless LAN directional antenna supported rotatably in a horizontal direction;
A conversion unit that converts the electric field strength detected by the detection unit into an audio signal having a frequency corresponding to the electric field strength;
A speaker for converting the audio signal converted by the conversion unit into audio;
An adjustment unit that adjusts the horizontal angle of the directional antenna;
An angle adjustment device for a wireless LAN directional antenna, wherein the angle of the directional antenna is adjusted by the adjustment unit based on sound from the speaker.   The angle adjustment device for a wireless LAN directional antenna according to claim 1, wherein the detection unit detects an output voltage from an RSSI output of the wireless LAN.   The wireless LAN directional antenna angle adjustment device according to claim 1, wherein the detection unit is an ISM band RF level meter, and outputs a field strength meter signal by detecting the field strength.   The wireless LAN directivity according to any one of claims 1 to 3, wherein the conversion unit generates an audio signal by performing V / F conversion based on a detection signal from the detection unit. Antenna angle adjustment device.   5. The angle adjustment device for a wireless LAN directional antenna according to claim 1, wherein the conversion unit generates a high-frequency audio signal as the voltage of the detection signal from the detection unit increases. .   5. The angle adjustment device for a wireless LAN directional antenna according to claim 1, wherein the conversion unit generates a low-frequency audio signal as the voltage of the detection signal from the detection unit increases. . The transmission signal from the transmitting antenna on the opposite side is received by the wireless LAN directional antenna supported rotatably in the horizontal direction,
Detect the electric field strength from the received signal received by the directional antenna,
The detected electric field strength is converted into an audio signal having a frequency corresponding to the electric field strength,
This audio signal is converted into audio by the speaker,
An angle adjustment method for a wireless LAN directional antenna, characterized by adjusting an angle in a horizontal direction of a directional antenna by an adjustment unit so that a pitch of the sound is highest or lowest based on sound from a speaker. .

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