JP4938097B2 - Transmitting system and transmitting antenna - Google Patents

Description

  The present invention relates to a transmission antenna and a transmission system. For example, an antenna element is arranged inside a guide medium or an advertisement medium to be installed in an existing facility, or a broadcast radio wave or the like is used using an existing facility as an antenna. The present invention relates to a transmission system capable of performing transmission and a transmission antenna.

  With the development of wireless communication technology and the rapid spread of wireless devices associated therewith, it has become necessary to perform wireless communication including radio, television broadcasting, mobile phones, etc. on a nationwide scale. For example, it is necessary to be able to communicate even in an underground shopping area that has been based on the assumption that radio waves do not reach.

  For this purpose, it is essential to install a large number of radio stations and antennas. Broadcasters and telecommunications carriers need to provide permanent wireless communication services by installing a large number of antennas at appropriate locations such as subways and underground malls in urban areas.

  For example, Patent Document 1 discloses a technique for exchanging wireless information by arranging wireless communication antennas arranged on the center line of a platform at a subway station or the like, and alert information indicating the position of the user Is sent to the user's wireless portable terminal to alert the user.

  Patent Document 2 wirelessly connects a monitoring camera installed on a platform in a subway station and a monitor system in a train so that the train driver can check the platform and track conditions before the train enters the station. We provide a track monitoring radio system for subway platforms.

JP 2003-032732 A JP 2004-196259 A

  As mentioned above, although the number of antennas will need to be increased in the future for the development of broadcasting and communication businesses, underground facilities in recent years are placing importance on aesthetics, and there is a problem with the aesthetics of the antennas themselves. Therefore, it is difficult to secure the installation location. This is a prominent and serious problem in subway stations and the like, especially in densely populated places and regions, and is also a factor in hindering the development of the wireless communication business.

  On the other hand, the installation of a new antenna must be compatible with the environment, and at the same time the installation cost must be taken into account. For this reason, an antenna with a very complicated structure has a problem in practical use.

  In addition, ground facilities have been shunned as well as equipment that damages the landscape, and antennas on the roof of buildings have been shunned. There was also the possibility of causing. For this reason, sufficient consideration for the installation of antennas is unavoidable even in ground facilities.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a transmission system and a transmission antenna that do not require a new antenna installation location.

In order to achieve the above object, for example, the following configuration is provided. That is, a transmission system that radiates radio waves into a space, comprising: a conductive portion formed by encapsulating a conductive material in a handrail portion of an escalator installed in a facility; and a supply means for supplying a radio signal to the conductive portion. And a handrail portion of the escalator is used as a transmitting antenna so that radio waves can be radiated to a space near the escalator installation location.
For example, the supply means supplies a radio wave signal in a non-contact inductive coupling state with the conductive part. For example, the radio signal radiated to the space is an analog radio signal in a broadcast wave band modulated by a predetermined method or a radio signal in a VHF band for digital radio broadcasting.

  According to the present invention, existing equipment can be used as an antenna as it is, and a new antenna can be easily installed without impairing the beauty of the facility. In other words, by using the handrail part of the escalator as a transmission antenna, it is possible to install a new antenna without damaging the beauty of the underground facility, and it is possible to view and terrestrial broadcasting waves etc. at low cost in the underground city and subway platforms, Even in a conventional radio wave shielding space such as a subway station, a broadcast radio wave with a predetermined power can be radiated.

It is a figure for demonstrating the example of installation of the transmission antenna in the transmission system of the example of 1st Embodiment based on this invention. It is a figure which shows the structure of the escalator type | mold antenna which is 1st Example of the transmission system of 1st Example. It is a figure which shows the structure of the ceiling antenna of the 2nd Example of the transmission system of 1st Example. It is a figure which shows the structure of the wall antenna of the 3rd Example of the transmission system of 1st Example. It is a figure which shows the structural example at the time of applying the home antenna of 4th Example of the transmission system of 1st Example to the transmission antenna of AM broadcast wave. It is a figure which shows the structural example at the time of applying the home antenna of 4th Example of the transmission system of 1st Example to the transmission antenna of FM broadcast wave. It is a figure for demonstrating the 1st example of installation of the transmission antenna using the ad balloon of the 2nd Example which concerns on this invention. It is a figure for demonstrating the 2nd example of installation of the transmission antenna using the ad balloon of the 2nd Example which concerns on this invention. It is a figure for demonstrating the example of installation of the antenna of the 3rd Embodiment based on this invention. It is a figure for demonstrating the example of installation of the antenna of the 4th Example based on this invention.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 shows an installation example of a transmission antenna as a radio transmission antenna according to the first embodiment of the present invention. Here, when terrestrial broadcasting waves such as AM, FM radio broadcasting, digital radio broadcasting, and multimedia broadcasting do not arrive, a transmission antenna is installed in a station such as a subway that is a so-called radio wave shielding space, and the terrestrial broadcasting is retransmitted. A transmission system (retransmission system) will be described as an example.

  However, the present invention is not limited to the above example, and is the same whether it is an underground shopping center or an underground facility of a building. Of course, it may be an in-building facility where radio waves are difficult to reach.

  In the transmission system shown in FIG. 1, a broadcast antenna 1 is a terrestrial transmission antenna for transmitting broadcast radio waves of FM broadcast stations, AM broadcast stations, digital radio broadcast stations or their relay stations that edit and broadcast various programs. It is. The broadcast radio wave 9 radiated into the space from the broadcast antenna 1 is received by the ground antenna 2 installed at a predetermined position such as the rooftop of a high-rise building, for example. The radio wave received by the ground antenna 2 is input to the retransmitting device 3 provided in the building via a predetermined transmission cable 2a such as a coaxial cable.

  The retransmitting device 3 is a device for retransmitting each of the above-mentioned broadcast waves from an antenna system disposed at a subway station or the like. The radio wave received by the ground antenna 2 is transmitted through the transmission cable 2a as a broadcast wave signal in which, for example, an AM broadcast signal of 531 kHz to 1620 kHz, an FM broadcast signal of 76 MHz to 90 MHz, and a VHF band broadcast signal of 90 to 222 MHz are combined. And input to the duplexer 4 in the retransmission apparatus 3.

  Then, the duplexer 4 distributes the broadcast radio signal for each broadcast band. For this reason, the AM relay unit 6, FM relay unit 7, and digital relay unit 8 corresponding to each distributed broadcast radio wave signal are connected to the output side of the duplexer 4. The digital relay unit 8 is compatible with digital radio broadcasting and multimedia broadcasting. However, a configuration in which a relay unit for digital radio broadcasting and a relay unit for multimedia broadcasting are separately provided may be used, and this can provide higher performance.

  In the AM relay unit 6 and the FM relay unit 7, for example, a band filter for removing input unnecessary signal components and a high frequency amplifier for amplifying a broadcast wave signal that has passed through the band filter are incorporated. . The reception status of broadcast waves received by the ground antenna 2 is always monitored by the reception monitoring unit 5.

  In this way, the broadcast wave signal amplified by each relay unit is combined and power amplified by the duplexer 13, and then received as a terrestrial broadcast wave reception signal to an antenna of this embodiment described later. Sent.

  The output from the retransmitting device 3 is supplied to the branching devices 10a to 10c via the duplexer 15 installed on the back of the ceiling of the subway station, for example. The branching devices 10a to 10c and the branching filter 15 are connected to each other by transmission lines 12a to 12c such as coaxial cables for signal transmission, for example.

  In the branching filter 15, for example, only the AM broadcast signal or the FM broadcast signal waveform is separated from the radio wave signal synthesized by the duplexer 13, and is extracted through the branching unit 17. It is sent to the escalator-type antenna 20 which is an aerial line and to the home antennas 50 and 60 built in the guide plate on the station platform.

  As will be described later, each of the turnouts 10a to 10c is provided on a ceiling antenna 30 built in a ceiling guide plate of a subway station, home antennas 50 and 60 built in a guide plate on a station platform, and a wall surface of the station. A wall antenna 40 built in the station name display board is connected.

  In addition, although the example in which all the various antennas are arranged in the station premises has been described with reference to FIG. 1, the present embodiment is not limited to the above example, and only one of these antennas is used. It may be provided, or may be provided with any combination of these antennas.

  Then, for example, AM broadcast waves and FM broadcast waves radiated from these antennas 20, 30, 40, 50, 60 having an output of several milliwatts are used by radio users and FM reception functions at subway stations and the like. It is received by a receiver such as an attached mobile phone. As a result, the user can listen to desired AM, FM broadcast, and digital broadcast.

  In this case, the antenna system can be installed without causing any particular discomfort or discomfort to the station user without damaging the aesthetics of the existing station equipment.

  In FIG. 1, the transmitter 3, the branching devices 10 a to 10 c and the transmission lines 12 a to 12 c are described as if they are ground facilities, but the antennas below the ground antenna 2 are not necessarily ground facilities. What is necessary is just to install in the location which cannot touch a user of a station or an underground facility directly, for example, the transmitter 3 is installed in the predetermined | prescribed room of an underground facility, and branching device 10a-10c and a transmission line 12a-12c may be arrange | positioned by the back side of a ceiling, or the lower part of a floor | bed.

{First Example}
FIG. 2 is a diagram for explaining a specific configuration example of an escalator type antenna that functions as a retransmission trusted antenna for AM broadcast waves among the antennas constituting the retransmission system shown in FIG.

  The escalator-type antenna 20 of the present embodiment shown in FIG. 2 normally uses a handrail portion of an existing escalator installed at a subway station or the like, and a mesh conductor, for example, near the center portion of the handrail portion, for example, An antenna element is formed by incorporating a mesh conductor to form a loop-shaped conductor path, and the handrail portion of the escalator is used as a transmission antenna.

  For example, the signal supply unit 25 is disposed at a predetermined position of the escalator close to the conductor built-in position of the handrail part (also referred to as a handrail or a rotating belt part), and is not in contact with the mesh conductor 21 built in the handrail part. In this state, an inductive coupling state is formed, and the AM broadcast signal is supplied from the signal supply unit 25 to the mesh conductor 21 through this portion.

  That is, the AM broadcast wave signal transmitted from the above-described demultiplexer 15 or the like is not received by the AM broadcast signal transmission unit 28 so that the radio wave output from the escalator antenna 20 becomes a predetermined value (for example, several milliwatts). After power amplification by the amplifier shown in the figure, the signal is sent to the signal supply unit 25 through a coupler 27 and a coupling capacitor C for impedance matching with the escalator antenna 20.

  The coupler 27 incorporates a variable coil L1 for impedance matching and variable capacitors C1 and C2. The coupler 27 itself is also referred to as an antenna coupler or an antenna tuner. A predetermined signal whose impedance is matched there is input to the escalator antenna 20, so that a return loss caused by signal reflection at the signal input end of the antenna 20 is reduced. The occurrence of a standing wave or the like in the antenna 20 is prevented.

  When the mesh conductor 21 incorporated in the handrail portion of the escalator is used as a transmission antenna, the characteristic impedance of the mesh conductor 21 varies depending on the installation scale of the escalator and the like, and it is necessary to perform impedance matching corresponding thereto. .

  Usually, a matching circuit using a lumped constant combining a coil and a condenser, a matching circuit using a distributed constant, or a matching circuit combining a lumped constant and a distributed constant may be used.

  Here, as shown in FIG. 2, a T-type circuit is adopted as a type of matching circuit using lumped constants, but the present invention is not limited to this, and the circuit type may be an L-type circuit or a π-type circuit.

  In addition to the above-described matching circuit, the impedance matching may be configured such that, for example, impedance matching is performed with a transmission line transformer having excellent high-frequency characteristics, and harmonics are removed from the received signal with a filter circuit.

  In this way, a mesh conductor is built in the handrail part of an escalator installed in an underground facility such as a subway station and used as a retransmission antenna for AM broadcast waves, so that a place for installing the antenna has been secured in the past. Even in a radio wave shielding space such as in a subway station where no terrestrial broadcast wave arrives, the user can listen to the desired AM broadcast without feeling uncomfortable with the surroundings.

  In addition, even if a disaster occurs and the power supply to the escalator is interrupted, the mesh conductor itself can act as an antenna. For example, by supplying power from an uninterruptible power supply or the like, it becomes possible for a user to continue to receive AM broadcasts even in the event of an emergency, etc., and to reliably receive information necessary to deal with the situation It becomes possible.

{Second Example}
FIG. 3 is a diagram for explaining a specific configuration example of a ceiling antenna 30 installed in a ceiling portion of a station such as a subway among the antennas constituting the system shown in FIG. As shown in FIG. 3, the display board (guide board) 31 is installed from the ceiling part 28 of an underground facility such as a subway station or suspended from a beam part, or installed in a state of being fixed to a side wall. It is what.

  In the present embodiment, the antenna element 33 is embedded and embedded in such a destination guide for a train, a guidance display board for a home number line, and the like. For example, an FM broadcast wave broadcast signal sent from the ground is supplied to the antenna element 33 from a feeder line 38 (for example, a coaxial cable from the branching device 10c in FIG. 1) made of a coaxial cable, for example. The plate part is operated as an antenna.

  The antenna element 33 constitutes an omnidirectional antenna such as a double resonance dipole antenna and radiates a predetermined output radio wave, so that it can be widely used for ground broadcasts such as FM radio broadcasts in underground facilities such as subway platforms. The radio wave can be retransmitted as it is in the underground facility.

  That is, by enabling the re-transmission of terrestrial broadcast radio waves in a radio-insensitive area (electromagnetic shielding space) of underground facilities such as a conventional subway station, a user of the subway can use a portable radio or FM owned by that person. FM broadcast waves can be received by a mobile phone with a reception function or a stationary radio.

  Further, since the antenna 33 is built in the existing display board 31, it is possible to provide an antenna system that does not impair the safety of users and the aesthetics of the subway station or the like and has almost no demerits due to installation.

{Third embodiment}
In the example shown in FIG. 4, among the antennas constituting the system shown in FIG. 1, a subway station name board, a guide board, an underground advertising board, etc., a wall part of an underground facility such as a subway station, or a standing guide The structure of the antenna installed in board equipment is shown.

  The example of FIG. 4 is an example in which an antenna element is provided in a guide plate (which is the same even when an advertisement panel is met) arranged on the side wall of an underground facility. For example, it is desirable to install this antenna mainly on a wall portion on the track side of an underground facility such as a subway station. This is because radio waves are easy to spread over a wide area and the influence on the human body can be minimized.

  The example shown in FIG. 4 is an example of a wall antenna 40 in which antennas 43 and 45 are arranged in a subway station name display board 41. The antenna elements 43 and 45 are built in the back side of the station name display board 41, and FM broadcast wave signals obtained by receiving terrestrial waves are supplied from a feeder line 48 made of, for example, a coaxial cable or the like via a distributor 46. .

  Since the existing station name display board 41 is usually provided with a plurality of fluorescent tubes for illumination, it is possible to secure a space for newly incorporating an antenna, particularly in a direction extending to the home side. Difficult cases are also assumed.

  Therefore, in this embodiment, for example, a film-shaped Yagi antenna is used as the antenna elements 43 and 45, and the antenna elements 43 and 45 are attached to the back side of the front panel of the station name display board 41 or the like.

  When pasting, while maintaining the directivity of the antenna elements 43 and 45 in the horizontal direction, by arranging the antenna elements 43 and 45 in the same manner on a plurality of other station name display plates arranged at the same station, Broadcast waves can be radiated to a wide area along the station platform.

  Even in this case, the existing facilities can be used to the maximum without changing the beauty of the underground facilities, the structure is simple, the antenna can be installed more inexpensively and efficiently.

  As a result of arranging the antenna elements 43 and 45 in the station name display board 41 in this way, the subway station platform is prevented from becoming a radio wave insensitive area (electromagnetic shielding space), and terrestrial broadcast radio waves and the like can be retransmitted. At the same time, by using the film-like antennas 43 and 45, it is possible to easily install (built-in) the antenna on the existing station name display board 41 where it is difficult to secure a space. Become.

{Fourth embodiment}
5 and 6 illustrate an example in which the antenna is built in a guide plate or the like installed on the platform of a subway station or the like in a subway station among the antennas constituting the system shown in FIG. It is a figure for doing, and the example of a structure of the antenna of the 4th Example is shown.

  FIG. 5 is an example of an AM broadcast wave transmission antenna, and FIG. 6 is an installation example of an FM broadcast wave transmission antenna. In order to install an antenna for transmitting broadcast waves, particularly AM broadcast waves (medium waves), a plane portion (screen-like portion) having a certain area is required. For example, information boards such as subway lines and exits installed on station platforms, timetables, and the like are suitable.

  A home antenna 50 shown in FIG. 5 is an AM broadcast antenna in which two loop coil antenna elements 53 and 55 are arranged in parallel in a guide plate 51. In order to correspond to the AM broadcast wave to be transmitted, the antenna elements 53 and 55 are, for example, divided into a low channel antenna element 53 and a high channel antenna element 55 around 1 MHz and embedded in the guide plate 51. It is.

  The antenna elements 53 and 55 are supplied with broadcast signals of AM broadcast waves sent from the ground via a distribution feed box 56 from a feed line 58 made of, for example, a coaxial cable or the like.

  In this way, the built-in antenna is divided into two for the low channel and the high channel as the home antenna, and the divided broadcast signals are supplied to the corresponding antenna elements 53 and 55, respectively. By adopting a configuration in which the antennas are accommodated side by side, the area and volume for accommodating the antenna can be suppressed. As a result, it is possible to effectively utilize the existing subway lines, exits, and other information boards 51 without damaging the aesthetics of underground facilities such as station platforms, and also to secure sufficient space to make AM broadcast waves in a wide area. Can be emitted.

  On the other hand, in the home antenna shown in FIG. 6, two Yagi antenna elements 63 and 65 are arranged in the guide plate 51 in order to correspond to transmission of FM broadcast waves. Broadcast signals of FM broadcast waves sent from the ground are supplied to these antenna elements 63 and 65 through a distributor 66 from a feeder line 68 made of, for example, a coaxial cable or the like. Here, the directivity characteristics of the antennas 63 and 65 are maintained in a horizontal direction with respect to the station platform, and the Yagi antenna is similarly arranged on the other guide plates on the platform. FM broadcast waves can be radiated to the area.

  In this way, the FM broadcast radio wave can be retransmitted by arranging the antennas 63 and 65 in the guide board 51 of the subway station platform, and the user of the station can receive the radio wave with a portable radio or the like owned by the subway station. The station platform becomes a radio-insensitive area (electromagnetic shielding space). In addition, since the existing guide plate 51 is used, an antenna can be installed (built in) at a low cost, and at the same time, it is possible to maintain the beauty of the subway station and the like.

  As described above, according to this embodiment, an antenna can be installed using equipment such as a guide board and an advertising board to be installed in an underground facility such as a subway station. The cost required for antenna equipment for retransmitting broadcast waves or the like can be greatly reduced as compared with the case of newly installing.

  In addition, because it is a transmission system that uses information boards, station name boards, etc. already installed in underground malls and subway stations, it can also be used for provision of terrestrial broadcasts and emergency broadcasts in times of disaster in so-called radio-insensitive areas (electromagnetic shielding spaces). It can be applied to expand and improve the quality of wireless communication services.

  At the same time, it is possible to provide a stable terrestrial broadcast re-transmission service by installing antennas at multiple locations on the same premises. In addition, AM, FM broadcasting and digital radio broadcasting can be received by portable radio or the like.

  In addition, the installation method of the antenna which concerns on the embodiment mentioned above is not only a station yard and a station platform, but the guide light which shows the emergency exit provided in a general building (office building), a public building, etc. The present invention can also be applied to a case where a wireless LAN antenna is arranged inside to perform mutual communication between a plurality of personal computers.

<Second Embodiment>
The above description has been given of a transmission antenna system and a transmission antenna suitable for installation in an underground facility. However, the present invention is not limited to the above example. For example, even in ground facilities, the second embodiment according to the present invention in which the antenna is installed without feeling uncomfortable with the existing landscape without being aware of the presence of the antenna. Exemplary embodiments will be described below with reference to FIGS.

  7 and 8 are diagrams for explaining the antenna configuration of the second embodiment according to the present invention. 7 and 8, a transmitting antenna element is arranged in a part of an ad balloon that is also used as an advertising medium as a radio antenna.

  A detailed configuration of the antenna according to the second embodiment will be described. The antenna according to the second embodiment has a multi-stage structure of folded dipole antennas in the vertical direction.

  The antenna shown in FIG. 7 is a detailed configuration of a horizontally polarized radio wave transmitting antenna in which a plurality of substantially horizontal folded dipole antennas are arranged in an advertisement display portion of an ad balloon.

  On the other hand, the antenna shown in FIG. 8 shows a detailed configuration of a vertically polarized radio wave transmitting antenna in which a plurality of substantially vertical folded dipole antennas are arranged in an advertisement display portion of an ad balloon.

  The antenna shown in FIG. 7 forms a stacked multi-stage collinear antenna by arranging four-stage folded dipole antennas 72a, 72b, 72c, and 72d in the advertisement display portion 71 of the ad balloon 70 in the horizontal direction. These folded dipole antennas are arranged so that the main radiation (main lobes) of the respective antennas are arranged in parallel while maintaining a predetermined interval in the vertical direction so that they are suitable for horizontally polarized radio wave transmission. Yes.

  Here, for example, a terrestrial broadcast wave signal such as FM radio broadcast is supplied from the broadcast signal transmission unit 76 to the distributor 73 disposed below the advertisement display unit 71 via the feeder line 75. The distributor 73 feeds a broadcast wave signal of a predetermined level to each of the four folded dipole antennas 72a, 72b, 72c, 72d.

  On the other hand, the antenna shown in FIG. 8 connects two folded dipole antennas 82a and 82b via a distribution feed box 87, and connects two folded dipole antennas 82c and 82d to the distribution feed box 88 to add them. The configuration is arranged in the advertisement display unit 81 of the balloon 80.

  These folded dipole antennas 82a, 82b, 82c, and 82d have a configuration in which each antenna element is arranged in the vertical direction so that the major axes of the antenna elements are the same while maintaining a predetermined interval.

  As described above, a stack type multistage (two parallel stack) collinear antenna is configured by arranging the main radiations (main lobes) of the respective antennas in parallel. With such an arrangement of antenna elements, an antenna suitable for vertically polarized radio wave transmission can be obtained.

  As with the antenna shown in FIG. 7, the antenna 83 shown in FIG. 8 also has a distributor 83 arranged below the advertisement display unit 81, and a terrestrial broadcast wave signal such as FM radio broadcast is broadcast via the feeder 85. The signal is supplied from the transmitter 86 to the distributor 83.

  A broadcast wave signal of a predetermined level is fed from the distributor 83 to the distribution power supply boxes 87 and 88. Further, in the antenna shown in FIGS. 7 and 8, a part of the feed lines 75 and 85 made of, for example, a coaxial cable or the like may function as a support line for the ad balloons 70 and 80 themselves.

  Further, in the antennas shown in FIGS. 7 and 8, the antenna elements are installed such that the total length L in the longitudinal direction of each antenna element is ½ of the wavelength λ of the terrestrial broadcast wave, and the input impedance is controlled to about 300Ω. I am going to do that. For this reason, when power is supplied through a normal coaxial cable, it is desirable to provide impedance distributors (balance / unbalance converters) or the like in the distributors 73 and 83.

  Furthermore, since the antenna shown in FIG. 7 and FIG. 8 is an antenna incorporated in an ad balloon, the directivity of the antenna is expected to change due to the influence of wind or the like at the actual installation site. In view of this, an azimuth magnetic needle, GPS, or the like may be mounted on the ad balloon, and the direction of the ad balloon itself may be controlled so that the directivity characteristic of the antenna does not change.

  In this way, folded dipole antennas are arranged in multi-stages on the advertisement display part of the ad balloon, and by using them as a stack structure, multiple antennas are excited simultaneously, making it easy to use horizontal or vertical polarization radio wave transmission antennas. Can be configured.

  As a result, for example, even in the event of a natural disaster such as an earthquake or typhoon, even when a normal broadcasting antenna facility cannot be used due to a collapse of a building or the like, a simple and inexpensive antenna can be assembled at the disaster site. In addition, since there is an advantage that the installation location is not selected, it is possible to ensure communication and transmit information smoothly in an emergency.

  As described above, according to the antenna system of the second embodiment, it is possible to assemble and install an antenna with few restrictions on the installation place and simple and inexpensive, and immediately broadcast (communication) especially in an emergency disaster. It is useful when the environment needs to be improved.

  In such a disaster, it is possible to obtain more excellent effects by displaying an emergency message and an emergency evacuation site on the advertisement display unit. For example, by displaying that the place where the ad balloon is raised is an evacuation place or a distribution place for various distribution items, it can be made more useful to the surrounding residents.

<Third Embodiment>
Normally, the rooftop of a building is selected as a suitable installation location for communication antennas because of its good visibility, but in recent years multiple antennas should be centrally installed to improve public awareness of electromagnetic environment, radio wave environment, etc. On the other hand, the number of residents in the vicinity who have anxiety is increasing. This is considered to be an emotion that can naturally occur even if these antennas meet the national installation standards (radio protection guidelines). In the third embodiment of the present invention, a new antenna installation method is proposed to deal with such a situation.

  FIG. 9 is a diagram for explaining an example of a method for installing an antenna as a radio antenna according to the third embodiment of the present invention. FIG. 9A is an example of a situation in which various antenna groups are installed on the ground structure, and a communication antenna group 91 including a plurality of antennas is installed on the roof of the building 90.

  Reference numeral 93 in FIG. 9B denotes a covering panel that also serves as an advertising tower for covering the antenna group of the third embodiment. The covering panel 93 is a combination of front and rear, left and right by locking both side surfaces of the rectangular panel, and has a width and length enough to cover the communication antenna group 91 with one side extending vertically. Have

  The panel material is desirably a radio wave permeable material (for example, a low dielectric constant material). Then, by installing this covering panel 93 so as to surround the entire communication antenna group 91 as shown in FIG. 9C, the antenna group can be made invisible from the surroundings, and the presence of the antenna group 91 Cannot be easily judged from the appearance.

  The covering panel 93 for enclosing the antenna group 91 is not particularly limited as long as it is a low dielectric constant material. For example, a dielectric material such as aramid fiber reinforced plastic that transmits radio waves, glass fiber reinforced plastic (GFRP), organic It can be composed of a polymer such as expanded polystyrene, polyethylene terephthalate (PET), polycarbonate, ABS resin, acrylic, vinyl chloride, fluororesin and the like.

  The above-described materials may be appropriately colored or drawn in consideration of the surrounding landscape and advertising effects. In addition, in order to improve the transmission efficiency of radio waves, for example, a large number of small holes may be provided in the cover panel 93 so that the inside surrounded by the cover panel 93 cannot be visually recognized.

  By doing so, the side of the cover panel 93 can be effectively used as an advertising medium as shown in FIG. 9C without impairing the original radio wave radiation function and reception function of the antenna. Coexistence and aesthetics can be improved. Not only that, it can contribute to the elimination of misunderstandings by residents in the surrounding area and the development of a sense of security.

<Fourth embodiment>
FIG. 10 is a diagram for explaining an installation example of the antenna according to the fourth embodiment of the present invention. Mainly, the antenna in a vehicle such as a taxi or a bus used for a passenger transportation service or the like. An installation example is shown.

  In the fourth embodiment, as shown in FIG. 10 (a), in an identification lamp (line lamp) or a guide plate installed on the roof (ceiling) of the body of an automobile vehicle 100 such as a taxi. An antenna is built in.

  For example, if a wireless loading coil antenna 103 is installed on the roof portion of an automobile, there is an aesthetic problem as it is, and since the antenna is a protrusion, there is a problem from the viewpoint of safety and reliability. .

  Therefore, in the fourth embodiment, a row lamp 105 that is a radio wave transmission type cover that is large enough to cover the loading coil antenna 103 is prepared, and the row lamp 105 is covered so as to cover the entire loading coil antenna 103. Lock.

  As a result, the antenna element 103 is accommodated in the row lamp as shown in FIG. Covering the antenna element with a radio wave transmissive cover not only maintains the antenna characteristics, but also improves aesthetics and safety at high speeds, etc. In addition, damage to the antenna due to contact with other objects, It is possible to prevent personal accidents such as stabs.

  As described above, according to each of the embodiments described above, an antenna system having a design corresponding to the landscape and design concept of an existing facility can be installed, and the facility user also has an antenna for the installation location. Since there is no need to pay attention to the installation location, the degree of freedom can be high. Even antennas for medium-wave broadcasting that require a particularly large installation location can be installed efficiently and inexpensively.

  For example, by constructing an antenna system using an ad balloon, it is possible to provide an antenna system suitable for use in emergency broadcasting during a disaster.

DESCRIPTION OF SYMBOLS 1 Broadcasting antenna 2 Ground antenna 2a Transmission cable 3 Retransmission apparatus 4 Duplexer 5 Reception monitoring part 6 AM relay unit 7 FM relay unit 8 Digital relay unit 10a-10c Branching device 15 Divider 20 Escalator type antenna 21 Mesh conductor 25 Signal Supply unit 27 Coupler 30 Ceiling antenna 40 Wall antenna 41 Station name display board 50, 60 Home antenna 51 Guide board 56 Distribution feed box 70, 80 Ad balloon 83 Distributor 87, 88 Distribution feed box 91 Communication antenna group 93 Cover panel 100 Vehicle 103 Loading coil antenna 105 row light

Claims (3)

A transmission system that radiates radio waves into space,
A conductive part formed by encapsulating a conductive material in a handrail part of an escalator installed in a facility;
Supply means for supplying a radio signal to the conductive portion,
A transmission system, wherein a handrail portion of the escalator is used as a transmission antenna, and radio waves can be radiated to a space near the escalator installation location. The transmission system according to claim 1, wherein the supply unit supplies a radio wave signal in a non-contact inductive coupling state with the conductive unit. 3. The transmission according to claim 1, wherein the radio signal radiated to the space is an analog radio signal in a broadcast wave band modulated by a predetermined method or a radio signal in a VHF band for digital radio broadcasting. system.

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