JP5404245B2 - Millimeter wave transmission system - Google Patents

Description

  The present invention relates to a millimeter wave transmission system, and more particularly, to a television signal such as a satellite broadcast signal or a satellite communication signal that is transmitted by millimeter waves.

  As such a millimeter wave transmission system, there is one disclosed in Patent Document 1, for example. According to the technique of the patent document, a first millimeter wave transmitter installed on the roof of a high-rise building transmits a millimeter-wave signal downward, and receives a plurality of first millimeter-wave receptions on a high-rise floor of the high-rise building. A machine is installed to receive the millimeter wave signal from the first millimeter wave transmitter. A second millimeter-wave transmitter installed on the middle floor of the high-rise building transmits a millimeter-wave signal downward, and a plurality of second millimeter-wave receivers are installed on the lower floor of the high-rise building. Receives millimeter wave signals from millimeter wave transmitters. The millimeter wave signals transmitted by the first and second transmitters are obtained by frequency-converting satellite broadcast signals and satellite communication signals received on the rooftops of high-rise buildings into millimeter waves.

Patent No. 4420387

  In the technique of Patent Document 1, it is possible to transmit a millimeter wave signal to each room of a high-rise building. In each room, by converting the frequency of the millimeter wave signal into the original satellite broadcast signal and satellite communication signal, the satellite broadcast is performed. And satellite communications. However, since the technique of Patent Document 1 is a high-speed building, it is possible to receive satellite broadcast signals and satellite communication signals that are the source of millimeter wave signals. In buildings where signals and satellite communication signals cannot be received directly, it is necessary to transmit millimeter wave signals to this building.

  An object of this invention is to provide the millimeter wave transmission system which can transmit a millimeter wave signal easily to the building in a building shadow.

In the millimeter wave transmission system according to one aspect of the present invention, the millimeter wave signal obtained by frequency-converting the received broadcast signal to the millimeter wave is directed to a building that is in the shadow of the building and cannot directly receive the broadcast signal . Transmit from the transmitting antenna of the transmitting means. As the broadcast signal, various signals such as a satellite broadcast signal, a satellite communication signal, and a terrestrial digital television broadcast signal can be used. The first transmission means is preferably installed at a position where a broadcast signal from a broadcast signal source such as a broadcast satellite, a communication satellite, a terrestrial digital television broadcast signal transmission station, etc. can be received. Demodulation in which the first receiving means provided on the roof of the incapable building has a receiving antenna for receiving the millimeter wave from the first transmitting means , and the received millimeter wave is demodulated into the broadcast signal. Broadcast signal is output. Second transmission means is provided on the rooftop of the unreceivable building. The second transmission means transmits a reconverted millimeter wave signal obtained by converting the demodulated broadcast signal into a millimeter wave signal again by using a transmission antenna toward the lower side of the unreceivable building. Second receiving means is provided outside each of the plurality of rooms of the building where reception is impossible. The second receiving means has a receiving antenna facing the transmitting antenna of the second transmitting means, and this receiving antenna receives the reconverted millimeter wave signal. The transmission antenna of the first transmission means and the reception antenna of the first reception means are both horn antennas, and the transmission antenna of the second transmission means and the reception antenna of the second reception means are either Also has a radio wave lens antenna.

In the millimeter wave transmission system configured as described above, the first reception unit that receives the millimeter wave signal, which is transmitted from the first transmission unit and whose frequency is converted from the broadcast signal, is installed in the building in the shadow of the building. Can do. Since both the first transmitting means and the receiving means perform transmission and reception by the horn antenna, the beam is narrow and sufficient to obtain C / N that does not cause trouble in reception. For example, a parabolic antenna can be used, but this beam is narrower than the horn antenna, and it is very difficult to adjust the direction of the parabolic antenna of the transmitting means and the receiving means so that it can be received by the receiving means. is there. However, since the horn antenna has a wider beam than the parabolic antenna, it is easier to adjust than the parabolic antenna. In addition, a reconverted millimeter-wave signal based on the millimeter-wave signal received by the first receiving means is transmitted by the second transmitting means to a plurality of second receiving means in a building that cannot be received. Each receiving means receives a millimeter wave signal and frequency-converts the millimeter wave signal to allow viewing based on the original broadcast signal.

The demodulated broadcast signal output from the first receiving means can be supplied to the third transmitting means. In this case, the demodulated broadcast signal is converted again into a millimeter wave signal, and the reconverted millimeter wave signal is transmitted to the other building in the shadow of the building where the broadcast signal cannot be received directly by the transmitting antenna. Sent. The millimeter wave signal from the third transmitting means is received by a receiving antenna of the third receiving means provided in another building where the reception is impossible. This receiving antenna faces the transmitting antenna of the third transmitting means. The transmitting antenna of the third transmitting unit and the receiving antenna of the third receiving unit are also horn antennas.

The horn antennas of the first transmitting means and the first receiving means may have elevation angle adjusting means. These elevation angle adjusting means have a scope whose direction coincides with the central axis of the horn antenna.

  The millimeter wave signal received by the receiving means can be transmitted by another transmitting means toward another building that is in the shadow of the building and cannot directly receive the broadcast signal. In this case, the millimeter wave signal from another transmission means is received by another reception means provided in another building where reception is impossible. Another transmitting means and another receiving means also have a horn antenna. If comprised in this way, a millimeter wave signal can be sequentially transmitted also to another building which cannot receive, and a millimeter wave can be transmitted to the building applicable to more building shadows.

  As described above, in the millimeter wave transmission system according to the present invention, it is possible to easily set a state in which a millimeter wave signal can be satisfactorily received.

It is a schematic block diagram of the millimeter wave transmission system of one Embodiment of this invention. It is a perspective view of the transmitter used with the millimeter wave transmission system of one embodiment of the present invention.

  As shown in FIG. 1, the millimeter wave transmission system according to an embodiment of the present invention is a shadow of a high-rise building 2 and cannot directly receive television broadcast signals such as satellite broadcast signals and satellite communication signals. In the possible buildings 4 and 6, satellite broadcasting and satellite communication can be viewed.

  On the roof of the building 8 that is not shaded by the high-rise building 2, an antenna that receives satellite broadcast signals and satellite communication signals, for example, an offset parabolic antenna 10 is disposed. The satellite broadcast signal and the satellite communication signal received by the offset parabolic antenna 10 are frequency-converted into a satellite broadcast intermediate frequency signal and a satellite communication intermediate frequency signal by a converter 12 attached to the offset parabolic antenna 10, and the first transmission means, For example, it is supplied to the millimeter wave transmitter 14. The millimeter wave transmitter 14 frequency-converts the satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal into, for example, a 60 GHz band millimeter wave to generate a millimeter wave signal. The millimeter wave signal is transmitted toward the roof of the building 6 by a transmission antenna provided integrally with the millimeter wave transmitter 14, for example, a horn antenna 16.

  On the roof of the building 6, an original satellite broadcast intermediate frequency signal and a satellite are received by a first receiving means such as a millimeter wave receiver 20 that is received by a receiving antenna, for example, a horn antenna 18 and is provided integrally with the horn antenna 18. The frequency is converted into a communication intermediate frequency signal.

  The satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal are divided into two by the two distributor 22. One two-distributed output of the two-distributor 22 is supplied to a second transmitting means, for example, a millimeter-wave transmitter 24, where the frequency is again converted to a millimeter-wave to generate a millimeter-wave signal. This millimeter wave signal is transmitted downward from the roof of the building 6 by a transmission antenna provided integrally with the millimeter wave transmitter 24, for example, a radio wave lens antenna 26. A receiving antenna for receiving a millimeter wave signal transmitted from the radio wave lens antenna 26, for example, a radio wave lens antenna 28, is arranged at the window or veranda of each room of each floor of the building 6. These radio wave lens antennas 28 are integrally provided with a second receiving means, for example, a millimeter wave receiver 30, and converts the received millimeter wave signal into the original satellite broadcast intermediate frequency signal and satellite communication intermediate frequency signal. . The satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal are supplied to the indoor television receiver, and the satellite broadcast and the satellite communication can be viewed. The beam width of the radio wave lens antenna 26 is wider than that of the horn antenna 16, and the radio wave lens antennas 28 are positioned within the beam.

  The other distribution output of the two distributors 22 is supplied to a third transmission means provided on the roof of the building 6, for example, a millimeter wave transmitter 32, and a transmission antenna provided integrally with the millimeter wave transmitter 32. For example, the signal is transmitted toward the roof of the building 4 by the horn antenna 34.

  On the roof of the building 4, a receiving antenna that receives a millimeter wave signal transmitted from the millimeter wave transmitter 32, for example, a horn antenna 36 is installed. The horn antenna 36 is integrally provided with third receiving means, for example, a millimeter wave receiver 38, and converts the millimeter wave signal received by the horn antenna into the original satellite broadcast intermediate frequency signal and satellite communication intermediate frequency signal. To do. The frequency-converted satellite broadcast intermediate frequency signal and satellite communication intermediate frequency signal are supplied to the fourth transmission means, for example, the millimeter wave transmitter 40.

  The millimeter wave transmitter 40 is integrally provided with a transmission antenna, for example, a radio wave lens antenna 42, and is transmitted downward from the roof of the building 4 by the radio wave lens antenna 42. A receiving antenna for receiving a millimeter wave signal transmitted from the radio wave lens antenna 42, for example, a radio wave lens antenna 44, is disposed at the window or veranda of each room of the floor of the building 4. These radio wave lens antennas 44 are integrally provided with a fourth receiving means, for example, a millimeter wave receiver 46, and converts the received millimeter wave signal into the original satellite broadcast intermediate frequency signal and satellite communication intermediate frequency signal. . The satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal are supplied to the indoor television receiver, and the satellite broadcast and the satellite communication can be viewed. The beam width of the radio wave lens antenna 42 is also wider than that of the horn antennas 16 and 34, and the radio wave lens antennas 44 are positioned within the beams.

  Therefore, even in the buildings 4 and 6 that are in the shadow of the building 2 and cannot receive satellite broadcast signals and satellite communication signals, the satellite broadcasts and satellite communications can be viewed. Therefore, since the millimeter wave signals are wirelessly transmitted from the building 8 to the building 6 and from the building 6 to the building 4, respectively, cables for transmitting satellite broadcast intermediate frequency signals and satellite communication signals are connected from the building 8 to the building. There is no need to lay on 6 and 4. Moreover, the millimeter wave transmitters and receivers 14, 20, 32, and 38 used for transmission and reception of this wireless transmission use horn antennas 16, 18, 34, and 36 as shown in FIG. 2 for transmission and reception. Yes.

  As an antenna used in the millimeter wave band, for example, an offset parabolic antenna or a radio wave lens antenna can be considered in addition to a horn antenna. The parabolic antenna has a large antenna gain, but the beam width is very narrow, and when used for transmission and reception between buildings, even if the position is slightly shifted between the parabolic antenna for transmission and the parabolic antenna for reception, Millimeter-wave signals cannot be transmitted and received satisfactorily, and it is very difficult to adjust the positions of the transmitting and receiving antennas.

  Since the radio wave lens antenna has a wide beam width, when used for transmission and reception between buildings, the positioning of the transmission antenna and the reception antenna is easy. However, since the noise is also received due to the wide beam width, the C / N is not good, and the satellite broadcast signal and the satellite communication signal received by the radio wave lens antenna are satisfactorily used. I cannot watch broadcasts or satellite communications.

  Therefore, a horn antenna having a beam width wider than that of the parabolic antenna and narrower than that of the radio wave lens antenna is used to facilitate alignment between the transmitting antenna and the receiving antenna and to improve C / N.

  As shown in FIG. 2, an inverted U-shaped metal fitting 48 for adjusting the elevation angle is disposed so as to cover the upper surface and side surfaces of the horn antennas 16, 18, 34, 36. Is fixed. An elevation angle adjustment bracket 48 is attached to an azimuth angle adjustment bracket that is rotatably mounted around a support (not shown) so that it can be rotated about a vertical axis, that is, a horizontal axis. Yes. The azimuth angle of the horn antenna 16, 18, 34, 36 is adjusted by adjusting the angular position of the azimuth angle adjusting bracket around the support column, and the elevation angle adjusting bracket is adjusted by adjusting the angular position around the horizontal axis. The elevation angle is adjusted. By adjusting the azimuth angle and the elevation angle in this way, the positions of the horn antenna 16 as a transmitting antenna and the horn antenna 18 as a receiving antenna are adjusted, and the horn antenna 34 and the receiving antenna as a transmitting antenna are adjusted. The position with the horn antenna 36 is adjusted. In order to further facilitate such alignment, a scope 50 is provided on the upper surface of the elevation angle adjusting bracket 48 so that the direction thereof coincides with the central axis of the horn antennas 16, 18, 34, 36.

  For example, a scope may be attached to a parabolic antenna or an offset parabolic antenna to facilitate alignment. However, it is easy to attach the scope to the primary radiator provided by the parabolic antenna or offset parabolic antenna, but the primary radiator faces the parabolic reflector or the offset parabolic reflector. Can not be used. In this regard, the scope can be easily attached to the horn antenna so that the direction of the horn antenna coincides with the direction of the central axis, and alignment can be performed more easily.

  In the above embodiment, the satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal are frequency-converted into millimeter waves. However, the present invention is not limited to these. It can also be frequency converted to waves. In the above embodiment, the millimeter wave signal is transmitted from the building 8 side only to the building 6 side. However, another millimeter wave transmitter 14 and a horn antenna 16 are provided on the building 8 side, and the shadow of the building not shown is provided. It can also be sent to another building. In this case, another horn antenna 18 and millimeter wave receiver 20 are provided on the other building side, and a transmitter 24, radio wave lens antenna 26, radio wave lens antenna 28, and millimeter wave receiver 30 are provided separately. . Similarly, another millimeter-wave transmitter 32 and a horn antenna 34 can be provided on the building 6 side, and transmission can be made toward a building in another building shadow not shown. Also in this case, a transmitter 40, a radio lens antenna 42, a radio lens antenna 44, and a millimeter wave receiver 46 are separately provided in another building in the building shadow.

14 32 millimeter wave transmitter (transmission means)
20 38 millimeter wave receiver (reception means)
16 18 34 36 Horn antenna

Claims (3)

A first transmission means having a transmission antenna for transmitting a millimeter wave signal obtained by frequency-converting a received broadcast signal to a millimeter wave toward a building that is in a building shadow and can not directly receive the broadcast signal;
A demodulated broadcast signal that is provided on the roof of the non-receivable building, receives a millimeter wave from the first transmission means with a reception antenna facing the transmission antenna of the first transmission means, and is demodulated into the broadcast signal first receiving means for outputting,
A second transmission antenna provided on the roof of the non-receivable building and configured to transmit a reconverted millimeter-wave signal obtained by converting the demodulated broadcast signal into a millimeter-wave signal toward the lower side of the non-receivable building; A transmission means;
A plurality of second receiving means for receiving the reconverted millimeter-wave signal by receiving antennas respectively provided outside the plurality of rooms of the non-receivable building and facing the second transmitting means;
A, the receiving antenna of the transmitting antenna and the first receiving means of the first transmission means are both horn antenna, the receiving antenna of the transmitting antenna and the second receiving means of said second transmission means Are millimeter-wave transmission systems , both of which are radio lens antennas . 2. The millimeter wave transmission system according to claim 1, wherein the demodulated broadcast signal output from the first receiving means is supplied to the third transmitting means, converted again into a millimeter wave signal, and the reconverted millimeter wave. The wave signal is transmitted by a transmitting antenna toward another building that is in the shadow of the building and cannot directly receive the broadcast signal, and the millimeter wave signal from the third transmission means is transmitted to the other building that cannot receive the broadcast signal. Received by the receiving antenna of the third receiving means facing the transmitting antenna of the third transmitting means, and the transmitting antenna of the third transmitting means and the receiving antenna of the third receiving means are also horn antennas. A millimeter wave transmission system. 2. The millimeter wave transmission system according to claim 1, wherein the horn antenna of the first transmitting means and the first receiving means has an elevation angle adjusting means, and these elevation angle adjusting means have the same orientation as the central axis of the horn antenna. Millimeter-wave transmission system that has a scope.

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