JP3731691B2 - ANTENNA DEVICE AND WIRELESS COMMUNICATION DEVICE - Google Patents

Description

[0001]
【table of contents】
The present invention will be described in the following order.
[0002]
TECHNICAL FIELD OF THE INVENTION
Conventional technology
Problems to be solved by the invention
Means for solving the problem
BEST MODE FOR CARRYING OUT THE INVENTION
(1) 1st Example (FIGS. 1-2)
(2) Second embodiment (FIG. 3)
(3) Third embodiment (FIG. 4)
(4) Other embodiments
The invention's effect
[0003]
BACKGROUND OF THE INVENTION
The present invention relates to an antenna device and a wireless communication device, and is suitably applied to, for example, a personal computer with a data transmission device (hereinafter referred to as a personal computer with a wireless modem) that transmits and receives data by wireless radio waves.
[0004]
[Prior art]
2. Description of the Related Art Conventionally, there is a personal computer with a wireless modem, which is composed of a personal computer as a base unit and a cordless phone as a handset, and wirelessly communicates data such as voice between the personal computer and the cordless phone.
[0005]
[Problems to be solved by the invention]
By the way, in a personal computer with a wireless modem having such a configuration, it is desired that the base unit and the handset communicate well. However, communication quality may deteriorate. Here, the reason why the communication quality deteriorates in the direction from the parent device to the child device, that is, the so-called downlink direction will be described.
[0006]
The first cause of this problem is that in a personal computer with a wireless modem, when the transmission power of the master unit is weakened, the radio wave radiated toward the slave unit is gradually weakened and propagates to the antenna of the slave unit. The received radio wave is gradually weakened, and the radio wave received by the antenna of the slave unit is weakened. As a result, good communication cannot be maintained.
[0007]
The second cause of such deterioration in communication quality is that when predetermined transmission power is supplied to the antenna of the master unit, the antenna converts the supplied transmission power into radio waves. The conversion efficiency for converting the transmission power into radio waves varies depending on the shape and size of the antenna. In other words, if the antenna gain is poor, the radiated radio wave becomes weak, and thus good communication cannot be maintained.
[0008]
The third cause of such deterioration in communication quality is that the radio wave radiated from the antenna of the master unit is attenuated as the distance between the master unit and the slave unit becomes long. As a result, it becomes impossible to maintain good communication.
[0009]
The fourth cause of such deterioration in communication quality is that there are various reflectors between the master unit and the slave unit, so that the radio waves radiated from the master unit's antenna are multiplexed waves through a large number of radio wave paths. When two or more radio waves pass through these many radio paths and reach the slave unit, the phase of each radio wave fluctuates separately between the master unit and the slave unit. Because of the fading that changes the strength of the radio wave with time due to the interference, the radio wave is weakened by this fading, so that the radio wave received by the antenna of the slave unit As a result, it becomes impossible to maintain good communication.
[0010]
The fifth cause of the deterioration in the communication quality is that when the antenna of the slave unit receives radio waves and the antennas convert the radio waves into reception power, the conversion efficiency for converting the radio waves into reception power depends on the shape of the antenna and It depends on the size. That is, if the antenna gain is poor, the reception power obtained as a result becomes weak, and therefore, good communication cannot be maintained.
[0011]
The sixth cause of the deterioration in communication quality is that the antenna of the slave unit receives radio waves, converts the radio waves into received power, and inputs the received power to the receiving circuit. The receiving circuit receives the input received signal. At this time, if the receiving circuit has a low level of receiving the received signal, that is, if the receiving sensitivity is low, good communication cannot be maintained.
[0012]
Actually, when the base unit is installed on the first floor indoors, and the handset is installed on the second floor indoors, the personal computer with a wireless modem, when wireless communication is performed between the base unit and the handset, There are objects that reflect radio waves, such as walls with closed spaces.
[0013]
In addition to this, indoors, the phase of each radio wave varies separately due to fading, and cancels due to the interference, resulting in a place where radio waves do not reach (hereinafter referred to as a dead point). There is a fear. In this case, since there are fewer moving bodies or the like that scatter radio waves in the room than outdoors, the propagation path of the radio waves is hardly changed by the moving bodies or the like. In the following, this is referred to as the antenna directivity), and it is considered that the dead point is generated almost constantly without changing the location.
[0014]
If a slave unit is installed at such a dead point, a personal computer with a wireless modem may be unable to communicate between the master unit and the slave unit. Fortunately, even if the slave unit is installed in a place other than such a dead point, if the user holds the slave unit and initiates a call to make a call, the location where the slave unit is held is the location of the dead point. As a result, the communication quality deteriorates, which may cause noise in the call sound or disrupt the call sound.
[0015]
As a method of avoiding this, after receiving the received signal, the receiving circuit of the slave unit restores the data sequence by deinterleaving and restores the transmission data by performing decoding such as Viterbi decoding. . As a result, burst errors generated due to a decrease in instantaneous reception level due to fading are reduced by error correction technology. Therefore, when the slave unit is instantaneously located at the dead point, it is possible to prevent noise and communication failure.
[0016]
However, even if it is a personal computer with a wireless modem with the above-mentioned countermeasures, if the slave unit stays in a place of the dead point where it is unfortunately hardly changed in this way for a long time. There was a problem that a burst error occurred for a long time, the error correction could not be performed, and communication was impossible.
[0017]
The present invention has been made in consideration of the above points, and an object of the present invention is to propose an antenna device and a wireless communication device that can perform wireless communication in a good state while avoiding the adverse effects of fading with a simple configuration.
[0018]
[Means for Solving the Problems]
In order to solve such a problem, the present invention provides an antenna device or a wireless communication device that is provided with a propeller that exchanges the internal air of the housing and the external air of the housing according to the rotation of the motor, Alternatively, an antenna for receiving is provided, and the antenna is moved in accordance with the rotation of the motor so that the antenna directivity is temporally changed. As a result, it is possible to avoid the occurrence of a steady dead point, so that an antenna device or a wireless communication device that can perform wireless communication in a favorable state can be realized.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
[0020]
(1) First embodiment
In FIG. 1, reference numeral 1 denotes a personal computer with a wireless modem as a whole, which is roughly composed of a personal computer 2 as a master unit and a cordless telephone 3 as a slave unit.
[0021]
The personal computer 2 inputs a transmission signal S 1 such as voice input from the telephone line to the convolutional encoder 6. The convolutional encoder 6 performs convolutional coding with a predetermined constraint length and a predetermined coding rate on the input transmission signal S1 and sends the transmission data S2 obtained as a result to the frame interleave circuit 7. The frame interleave circuit 7 rearranges the random order of data that is completed within one frame with respect to the input transmission data S2, and the transmission data S3 obtained as a result is converted into DQPSK (Differential 4-phase phase shift keying: Differential). Quadrature Phase Shift Keying)
[0022]
The DQPSK modulator 8 performs DQPSK modulation on the input transmission data S 3, and sends the transmission signal S 4 obtained as a result to the high-frequency circuit 9. The high frequency circuit 9 frequency-converts the input transmission signal S4 into a transmission signal S5 having a predetermined frequency [Hz] and amplifies the transmission signal S5 to a desired power. To send.
[0023]
The dipole antenna 10 converts the transmission signal S5 into a radio wave E1 (indicated by an arrow in FIG. 1) and radiates it into the space toward the antenna directivity variable unit 5 and the cordless telephone 3. Here, the length of the dipole antenna 10 is selected so that the radiated radio wave E1 has a half wavelength.
[0024]
The directivity variable unit 5 includes a rotating body 12, and the rotating body 12 rotates in one direction around the rotation shaft 26. The rotating body 12 is provided with eight fins 12A radially from the center of the rotating body. The fin 12A is made of a non-conductive substance and transmits the radiated radio wave E1.
[0025]
In the case of this embodiment, one conductor rod 13 is disposed inside one fin 12A. The shape and size of the conductor rod 13 are selected so that the free space wavelength is about ½ that of the half-wavelength antenna 10. One conductor bar 13 is provided for each fin 12A, and eight conductor bars 13 are provided as the rotating body 12 having eight fins 12A.
[0026]
The rotating body 12 is provided with the conductor rods 13 so that the interval between the individual conductor rods 13 is about a half wavelength. When the rotating body 12 having such a conductor rod 13 rotates, that is, when the conductor rod 13 is rotated and moved closest to the antenna 10, the conductor rod 13 is arranged at a position where the distance from the antenna 10 becomes about a half wavelength. It is installed.
[0027]
The directivity variable unit 5 connects the antenna 10 and the conductor rod 13 with the radio wave E1 propagating around the conductor rod 13 among the radiated radio waves E1 by rotating the conductor rod 13 as described above. By guiding in a predetermined extension line direction, the radiation direction of the radio wave E1 is switched to radiate the radio wave E2 toward the cordless telephone 3 as the radio wave E2.
[0028]
Thus, the antenna device section 4 includes the antenna 10 as a radiating conductor that radiates the radio wave E1, and the conductor rod 13 as a director whose parasitic element serves to guide the radio wave E1 in a predetermined direction. The propagation path of the radio wave E1 is temporally changed by rotating the conductor rod 13 with respect to the radio wave E1 radiated from the radio wave 10. That is, the directivity of the antenna 10 is changed with time.
[0029]
On the other hand, the radio wave E1 directly directed to the cordless telephone 3 out of the radio wave E1 radiated from the antenna 10 is propagated in the space and reaches the antenna 15 of the cordless telephone 3. For this reason, due to the presence of various reflectors in the space between the personal computer 2 and the cordless telephone 3, the radio wave E1 may be attenuated by the above-described fading.
[0030]
2 in which the same reference numerals are assigned to the parts corresponding to those in FIG. 1, an antenna device for realizing such wireless communication and a personal computer 1 with a wireless modem as a wireless communication device are shown. .
[0031]
In the personal computer 2, a personal computer main body 20 (shown by a broken line in FIG. 2) is provided, and an IC memory, a hard disk drive device, etc. (not shown) are accommodated in the personal computer main body 20. The outer periphery of the personal computer main body 20 is formed of a conductive shield case. The personal computer 2 is provided with an input terminal 22, and a transmission signal S1 such as voice is input from a telephone line. The input terminal 22 is provided with a cable 23 and connects the input terminal 22 and the personal computer main body 20.
[0032]
The personal computer main body 20 is provided with a wireless modem unit 21, which generates a transmission signal S 5 based on the transmission signal input from the cable 23 and sends the transmission signal S 5 to the dipole antenna 10. In the wireless modem unit 21, two dipole antennas 10 having a shape and size corresponding to the half-wave radio wave E1 to be output are provided symmetrically with a predetermined interval. The antenna 10 converts the transmission signal S5 input from the wireless modem unit 21 into a radio wave E1, and radiates the radio wave E1 toward the cooling fan 31 and the cordless telephone 3 into the space.
[0033]
In such a personal computer main body 20, the outer periphery of the personal computer main body 20 is covered with a casing 24. The casing 24 is formed with a predetermined length, width, and height, and a casing internal space 25 is secured as a predetermined space between the inner surface of the casing 24 and the inner surface of the personal computer main body 20. Has been. The casing 24 is made of a nonconductive resin.
[0034]
Such a casing 24 is provided with a display device, an activation button, and the like (not shown) on the front surface 24A. When the activation button is pressed and activated by the user, the personal computer main body 20 and the display device are heated. And the air inside the housing 24 is heated.
[0035]
On the other hand, the housing 24 is provided with a ventilation port 24C having a predetermined diameter on the back surface 24B, so that the internal space 25 and the external space of the housing 24 communicate with each other through the ventilation port 24C. ing. Incidentally, the ventilation port 24 </ b> C can exchange the heated air inside the housing 24 and the outside air. This ventilation port 24C is provided with a cooling fan (electric fan) 31 as the directivity variable unit 5 described above with reference to FIG.
[0036]
The cooling fan 31 is provided with a rotation motor (not shown) and is driven to rotate at a predetermined rotation speed R. Here, the predetermined rotational speed R of the rotary motor is selected to be 6000 [rpm] rotations per minute. A rotary shaft 26 is attached to the rotary motor, and the rotary motor is rotated at a predetermined rotational speed R in the direction indicated by an arrow r1 in the drawing. A propeller 32 is attached to the rotating shaft 26 as the rotating body 12 described above with reference to FIG. 1. The propeller 32 is connected to the rotating shaft 26 by the rotational drive of the rotating shaft 26. Similarly, it is rotated at a predetermined rotational speed R in the direction indicated by the arrow r1.
[0037]
Further, the cooling fan 31 releases the heated air heated by the heat generated by the personal computer main body 20 from the ventilation port 24 </ b> C to the external space by the suction force obtained by rotating the propeller 32. The internal computer body 20 can be cooled.
[0038]
In practice, the cooling fan 31 rotates the propeller 32, in which the conductor rod 13 is built, as described above by the rotation motor at a speed of 6000 [rpm] per minute in the direction indicated by the arrow r1. That is, the cooling fan 31 rotates the eight conductor rods 13 at a speed of 6000 [rpm] per minute, so that the electric wave E1 passing through the periphery of the conductor rods 13 is rotated at every turn. The position can be rotated. Incidentally, this 6000 [rpm] rotation per minute becomes a cycle of 100 [Hz] per second when converted into a frequency f [Hz].
[0039]
Thus, when the cooling fan 31 rotates the conductor rod 13 with respect to the radio wave E1 at a cycle of 100 [Hz] per second, the radiation direction of the radio wave E1 is switched 100 times per second per conductor rod 13. . When such switching is performed with the eight conductor rods 13, the radiation direction of the radio wave E1 is switched 800 times per second, which is eight times the radiation direction switching with one conductor rod 13. The radiation direction is switched.
[0040]
Accordingly, the eight conductor rods 13 are rotated at a speed of 6000 [rpm] per minute to change the directivity of the antenna 10 at a cycle of 800 [Hz] per second. That is, the cooling fan 31 can change the directivity of the antenna 10 with time. Thus, the propagation path of the radio wave E1 can be changed at a cycle of 800 [Hz] per second.
[0041]
Accordingly, the cooling fan 31 serving as the directivity varying means rotates the conductor rod 13 to continuously switch the radiation direction of the radio wave E1 to radiate the radio wave E2 into the space as the radio wave E2. As a result, the propagation path of the radio wave E2 changes and reaches the antenna 15 of the desired cordless telephone 3.
[0042]
Thus, by changing the propagation path of the radio wave E2 with time, it is possible to avoid the occurrence of a steady dead point.
[0043]
The cordless telephone 3 has a radio unit 27 housed in a case 28. The radio unit 27 has a dipole antenna 15 having a predetermined length penetrating the case 28 and is connected to the radio unit 27 and a speaker 29 is provided on the outer periphery of the case 28. Therefore, the antenna 15 receives the radio waves E2 and E1 that have arrived, and sends them to the wireless unit 27 as received signals. The radio unit 27 performs predetermined demodulation on the input received signal to restore the received signal, and outputs the received signal as sound through the speaker 29.
[0044]
Here, in FIG. 1, 3 indicates the configuration of the cordless telephone 3 described above.
[0045]
The cordless telephone 3 receives the propagated radio waves E2 and E1 by the dipole antenna 15 and converts them into a received signal S6 and inputs it to the high frequency circuit 16. The high frequency circuit 16 amplifies the reception signal S6 to a desired power, and then frequency-converts the reception signal S6 to a predetermined band, and inputs the reception signal S7 obtained as a result to the DQPSK demodulator 17. The DQPSK demodulator 17 demodulates the received signal S7 according to the signal modulation performed on the transmission side, performs delay detection on the received signal S7 obtained as a result, restores it, and receives the received data S8 obtained as a result of the frame decoding. Send to interleave circuit 18.
[0046]
The frame deinterleave circuit 18 performs the data rearrangement performed on the transmission side on the reception data S8 to restore the data order, and transmits the reception data S9 obtained as a result to the Viterbi decoder 19. The Viterbi decoder 19 performs Viterbi decoding on the received data S9 in order to decode the convolutional code performed on the transmission side and performs error correction of the burst error (that is, considers the trellis of the convolutional code by accumulating a predetermined bit of the received data. The data is decoded into error-free data by estimating the most probable state from all the possible state transitions of the data), and a predetermined [bit] received signal S10 is restored per frame. Accordingly, the wireless unit 27 restores the transmission signal S1 finally transmitted on the transmission side as a reception signal S10 and outputs it as sound through the speaker 29.
[0047]
Here, when the phase of each radio wave E2 and / or radio wave E1 is separately changed by fading and cancels due to the interference and a dead point where the radio wave E2 does not reach occurs locally, the cordless telephone 3 Even if it is installed at the place of the dead point, the dead point is changed in place in a short time by changing the directivity of the antenna 10 in time. Therefore, the reception level can be reduced instantaneously at the location of the dead point. As a result, the radio unit 27 can reduce the error caused by the above-described error correction technique for the burst error that occurs due to the decrease in the instantaneous reception level. Thus, the personal computer with a wireless modem 1 can avoid the situation where communication between the personal computer 2 and the cordless telephone 3 is disabled.
[0048]
In the above configuration, when the wireless modem-equipped personal computer 1 performs wireless communication with the cordless telephone 3, the conductor bar 13 is rotated with respect to the radio wave E1 radiated from the antenna 10, and the radio wave E1 is transmitted to the antenna 10 and the conductor bar 13 with the radio wave E1. , The propagation path of the radio wave E1 is continuously changed. That is, the directivity of the antenna 10 is changed every moment. As a result, the propagation path is changed with time, and the radio wave E2 reaches the antenna 15 of the cordless telephone 3.
[0049]
Accordingly, since the dead point generated by fading can be changed in a short time locally, it is possible to avoid the occurrence of a steady dead point as in the prior art. Thus, burst errors can be reduced by error correction technology by instantaneously reducing the reception level, and wireless communication can be performed in a good state.
[0050]
According to the above configuration, the personal computer 1 with a wireless modem rotates the conductor rod 13 that guides the radio wave E1 in a predetermined direction with respect to the radio wave E1 radiated from the antenna 10 to change the directivity of the antenna 10 in terms of time. By providing the cooling fan 31 that can be changed, the occurrence of a steady dead point can be avoided, and wireless communication can be performed in a good state.
[0051]
Thus, it is possible to realize an antenna device and a wireless communication device that can perform wireless communication in a good state while avoiding adverse effects due to fading with a simple configuration.
[0052]
Further, according to the above-described configuration, the personal computer 1 with a wireless modem mechanically changes the directivity of the antenna 10 using the cooling fan 31 used in a general personal computer, so that each slave unit to be communicated On the other hand, compared with the method in which the user manually switches the direction of the antenna 10, the user's trouble can be saved.
[0053]
(2) Second embodiment
In FIG. 3, which shows parts corresponding to those in FIG. 1 with the same reference numerals, a personal computer 1 with a wireless modem according to a second embodiment of the present invention is shown.
[0054]
In the case of the second embodiment, the cooling fan 40 is provided in the same manner as in the first embodiment described above. The cooling fan 40 has a propeller fan 41 and rotates the propeller fan 41 in one direction. In this propeller 41, eight fins 41A are arranged radially from the center of the propeller 41.
[0055]
In this embodiment, the propeller fan 41 is made of a conductive material and can reflect the radio wave E1. Here, when the fin 41 </ b> A is rotated by the cooling fan 40 and is closest to the antenna 10, the propeller fan 41 is attached at a position where the distance from the antenna 10 becomes about a half wavelength.
[0056]
In practice, the cooling fan 40 reflects the radio wave E1 that collides with the fin 41A out of the radio wave E1 radiated from the antenna 10 by rotating the fin 41A. When the fins 41A that have reflected the radio waves E1 eventually rotate and the radio waves E1 are positioned between the fins 41A, the radio waves E1 are propagated between the fins 41A and radiated into the space. By repeating such an operation in a short time, the cooling fan 40 continuously and intermittently propagates the radio wave E2. That is, the cooling fan 40 can change the directivity of the antenna 10 with time.
[0057]
Accordingly, in the cooling fan 40 as the directivity varying means, the dipole antenna 10 as a radiating conductor that radiates the radio wave E1, and the propeller 41 as a reflector in which a parasitic element functions to reflect the radio wave E1 in a predetermined direction. The propeller fan 41 is rotated and moved with respect to the radio wave E1 radiated from the antenna 10 to continuously and intermittently propagate the radio wave E1.
[0058]
In the above configuration, when the wireless modem-equipped personal computer 1 performs wireless communication with the cordless telephone 3, the radiated radio wave E1 is rotated by rotating the conductive fin 41A with respect to the radio wave E1 radiated from the antenna 10. Among them, the radio wave E1 that collides with the fin 41A is reflected. Subsequently, when the fins 41A reflecting the radio waves E1 are rotated and the radio waves E1 are positioned between the fins 41A, the radio waves E1 are propagated between the fins 41A and radiated into the space. By repeating this operation in a short time by rotating each fin 41A, the radio wave E2 is propagated intermittently. That is, the directivity of the antenna 10 can be changed every moment. As a result, the radio wave E2 is continuously and intermittently propagated to reach the antenna 15 of the cordless telephone 3.
[0059]
Accordingly, since the dead point generated by fading can be changed in a short time locally, it is possible to avoid the occurrence of a steady dead point as in the prior art. Thus, burst errors can be reduced by error correction technology by instantaneously reducing the reception level, and wireless communication can be performed in a good state.
[0060]
According to the above configuration, the personal computer with a wireless modem 1 changes the directivity of the antenna 10 over time by rotating the conductive fin 41A that reflects the radio wave E1 with respect to the radio wave E1 radiated from the antenna 10. By providing the cooling fan 40 that can be made, it is possible to avoid the occurrence of a steady dead point, so that wireless communication can be performed in a good state.
[0061]
Thus, it is possible to realize an antenna device and a wireless communication device that can perform wireless communication in a good state while avoiding adverse effects due to fading with a simple configuration.
[0062]
Moreover, according to the above-described configuration, the personal computer 1 with a wireless modem mechanically changes the directivity of the antenna 10 using the cooling fan 40 used in a general personal computer, so that each slave unit to be communicated On the other hand, compared with the method in which the user manually switches the direction of the antenna 10, the user's trouble can be saved.
[0063]
(3) Third embodiment
In FIG. 4, which shows parts corresponding to those in FIG. 2 with the same reference numerals, a personal computer 1 with a wireless modem according to a third embodiment of the present invention is shown.
[0064]
In the case of the third embodiment, the cooling fan 50 is provided as in the first embodiment. The cooling fan 50 has a propeller fan 51 and rotates the propeller fan 51 in one direction. The propeller fan 51 is provided with eight fins 51 A radially from the center of the propeller fan 51.
[0065]
In the case of this embodiment, a power supply spring 53 having a predetermined length that connects the wireless modem unit 21 and the propeller fan 51 is attached to the wireless modem unit 21, and the wireless modem unit 21 transmits the transmission signal S5 to the wireless modem unit 21. The power is sent to the power supply spring 53. The propeller fan 51 is provided with a metallic annular ring 54 having the same center as that of the rotating shaft 26, and this ring 54 is in contact with the power supply spring 53. As a result, when the propeller fan 51 is rotated, the power supply spring 53 is kept in contact with the ring 54, and the power supply spring 53 transmits the transmission signal S5 transmitted from the wireless modem unit 21 to the ring 54 made of metal. . A linear antenna 52 is embedded in and attached to the inside of a single fin 51A, and is composed of a conductor rod having a predetermined shape and size. The fin 51A is made of a non-conductive substance, and transmits the radio wave E1 radiated from the built-in linear antenna 52 and radiates it into the space.
[0066]
Actually, the cooling fan 50 continuously switches the radio wave path for propagating the radio wave E2 by rotating the propeller fan 51 and switching the direction of the linear antenna 52 by 360 [°]. That is, the cooling fan 50 can change the directivity of the antenna 52 momentarily.
[0067]
Therefore, the cooling fan 50 as the directivity varying means has the antenna 52 as a radiation conductor that radiates the radio wave E1, and the radio wave path through which the radio wave E1 is propagated is made continuous by rotating the antenna 52. Can be switched.
[0068]
In the above configuration, when the wireless modem-equipped personal computer 1 performs wireless communication with the cordless telephone 3, the antenna 52 is rotated so that the direction of the antenna 52 is switched by 360 [°] and the radio wave path E2 is continuously transmitted. Switch. That is, the directivity of the antenna 52 is changed every moment. As a result, the radio wave path is continuously switched at a high speed so that the radio wave E2 reaches the antenna 15 of the cordless telephone 3.
[0069]
Therefore, since the dead point generated by fading can be changed in a short time locally, it is possible to avoid the occurrence of a steady dead point as in the prior art. Thus, burst errors can be reduced by error correction technology by instantaneously reducing the reception level, and wireless communication can be performed in a good state.
[0070]
According to the above configuration, the wireless modem-equipped personal computer 1 is provided with the cooling fan 50 that can continuously change the direction of the antenna 52 in the direction of 360 [°] and change the directivity of the antenna 52 with time. Therefore, it is possible to avoid the occurrence of a steady dead point, so that wireless communication can be performed in a good state. Thus, it is possible to realize an antenna device and a wireless communication device that can perform wireless communication in a good state while avoiding adverse effects due to fading with a simple configuration.
[0071]
Further, according to the above-described configuration, the personal computer 1 with a wireless modem mechanically changes the directivity of the antenna 52 using the cooling fan 50 used in a general personal computer. On the other hand, compared with the method in which the user manually switches the direction of the antenna 52, the user's trouble can be saved.
[0072]
(4) Other embodiments
In the above-described embodiment, the case where the antenna device unit 4 is provided with the cooling fan 31 as the directivity variable unit 5 and the conductor rod 13 and the like are rotationally moved with respect to the radio wave E1 has been described. Not limited to this, the same effect as in the above-described embodiment can be obtained by using moving means for continuously moving the conductor rod 13 and the like with respect to the radio wave E1 at high speed.
[0073]
In the above-described embodiment, the case where the propagation path of the radio wave E1 is changed at a period of 800 [Hz] per second has been described. However, the present invention is not limited to this, and the period for changing the propagation path is fast in time. As the dead point changes in place earlier, it is possible to quickly avoid a situation where communication is disabled. For this reason, increasing the number of conductor rods 13 to be rotated and moving may increase the period for changing the propagation path in terms of time.
[0074]
Furthermore, in the above-described embodiment, the case where the conductor rod 13 is disposed inside the fin 12A made of a non-conductive material has been described. However, the present invention is not limited to this, and the fin is not limited to the radio wave E1. It may be exposed from 12A.
[0075]
Further, in the above-described embodiments, the case where the dipole antenna 10 is used has been described. However, the present invention is not limited to this, and other devices such as a distributed antenna that switches the antenna directivity using a plurality of antennas may be used. Various antennas may be used.
[0076]
Furthermore, in the above-described embodiments, the case where the personal computer 1 with a wireless modem 1 and the cordless telephone 3 are used as a wireless communication device that transmits and receives wireless radio waves has been described. However, once installed indoors, the same effects as those of the above-described embodiments can be obtained even using various other wireless communication devices such as an air conditioner and a television that are difficult to move.
[0077]
Furthermore, in the above-described embodiment, the case where the antenna device unit 4 capable of mechanically changing the directivity of the antenna 10 is provided on the transmission side has been described. However, the present invention is not limited thereto, and the antenna device unit 4 is received. Even if it is provided on the side, the same effect as in the above-described embodiment can be obtained. This is because the normal antenna is considered to have an objectivity between the transmission characteristic and the reception characteristic. Therefore, the antenna directivity can be changed on the reception side to obtain the same effect as the above-described embodiment.
[0078]
【The invention's effect】
As described above, according to the present invention, the propeller that exchanges the internal air of the housing and the external air of the housing according to the rotation of the motor is provided in the antenna device or the wireless communication device, and the propeller is configured to transmit radio waves. In addition, an antenna for receiving is provided, and the antenna is moved according to the rotation of the motor to change the directivity of the antenna with time. As a result, the occurrence of a steady dead point can be avoided, and wireless communication can be performed in a good state.
[0079]
Thus, it is possible to realize an antenna device and a wireless communication device that can perform wireless communication in a good state while avoiding adverse effects due to fading with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a schematic block diagram showing a circuit configuration of a wireless communication apparatus according to the present invention.
FIG. 2 is a schematic perspective view showing the configuration of the first embodiment of the wireless communication apparatus according to the present invention;
FIG. 3 is a schematic perspective view showing the configuration of a second embodiment of the wireless communication apparatus according to the present invention;
FIG. 4 is a schematic perspective view showing a configuration of a third embodiment of the wireless communication apparatus according to the present invention;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... PC with a wireless modem, 2 ... PC, 3 ... Cordless telephone, 4 ... Antenna device part, 5 ... Directivity variable part, 10, 15 ... Dipole antenna, 12 ... Rotating body, 13 ... ... conductor rod, 21 ... wireless modem, 31, 40, 50 ... cooling fan, 32 ... propeller.

Claims (6)

In an antenna device having an antenna for transmitting and receiving radio waves,
A propeller that replaces the internal air of the housing and the external air of the housing according to the rotation of the motor;
An antenna provided on the propeller for transmitting and / or receiving the radio wave;
The antenna device being characterized in that so as to temporally change the directivity of the antenna by moving the antenna in response to rotation of the motor. In an antenna device having an antenna for transmitting and receiving radio waves,
A propeller that replaces the internal air of the housing and the external air of the housing according to the rotation of the motor;
A director provided on the propeller and guiding the radio waves in a predetermined direction;
Features and to luer antenna device that is moved and so as to temporally change the directivity of the antenna to the waveguide in response to rotation of the motor. In an antenna device having an antenna for transmitting and receiving radio waves,
It is made of a material that reflects the radio wave, and includes a propeller that exchanges the internal air of the housing and the external air of the housing according to the rotation of the motor .
Features and to luer antenna device that has been so by changing the reflection of the radio wave is temporally changing the directivity of the antenna relative to the antenna in response to rotation of the motor. In a wireless communication device that transmits and / or receives radio waves,
A communication apparatus main body for generating and / or demodulating a signal for transmitting and / or receiving the wireless radio wave via an antenna;
An antenna device unit that temporally changes the directivity of the antenna when transmitting and / or receiving the radio wave;
With
The antenna device section is
The wireless communication device according to claim 1, wherein the antenna is provided on a propeller that exchanges internal air of the housing and external air of the housing according to rotation of the motor . In a wireless communication device that transmits and / or receives radio waves,
A communication apparatus main body for generating and / or demodulating a signal for transmitting and / or receiving the wireless radio wave via an antenna;
An antenna device unit that temporally changes the directivity of the antenna when transmitting and / or receiving the radio wave;
With
The antenna device section is
In accordance with the rotation of the motor, the propeller replacing the external air within the air and the casing of the housing, radio communications device characterized in that so as to provide a waveguide for guiding the radio wave in a predetermined direction. In a wireless communication device that transmits and / or receives radio waves,
A communication apparatus main body for generating and / or demodulating a signal for transmitting and / or receiving the wireless radio wave via an antenna;
When sending and or receiving the radio wave, the antenna device unit for changing the directivity of the upper Symbol antenna temporally
With
The antenna device section is
In accordance with the rotation of the motor, radio communications device characterized in that the propeller replacing the external air within the air and the housing of the casing, and a material for reflecting the radio waves.

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