JP2516141B2 - Indoor wireless LAN antenna device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a single master station installed in a room and a plurality of slave stations installed in appropriate places in the same room.
The present invention relates to an antenna device of a master station in an indoor wireless LAN that performs wireless communication using a directional antenna .

[0002]

2. Description of the Related Art FIG. 16 shows a conventional wireless L
FIG. 17 is an explanatory diagram showing an arrangement of an AN master station and a plurality of slave stations. FIGS. 17 and 18 show radio waves when the master station uses a horizontal omnidirectional antenna and a directional antenna in the conventional example of FIG. 16, respectively. It is explanatory drawing which shows a propagation and a reflection state. In FIG. 16, the antenna of the master station 1 is horizontally omnidirectional and covers a wide range in the periphery with one antenna, and the plurality of slave stations 2
Is configured to communicate with. Also, FIG.
6 shows a part of the horizontal communication path of the slave station 2,
In reality, the vertical plane can be considered as well.

As described above, since the antenna of the master station is horizontally omnidirectional, radio waves are radiated in unnecessary directions, and depending on the shape of the building and the installation location, radio waves delayed as a result of reflection Will be very likely to be received. The reflected wave becomes very complicated because it changes depending on the reflectance and shape of the wall, the incident angle of the radio wave, etc., but generally the level decreases as the number of reflections increases. As shown in FIG. 17 and FIG. 18, considering the reflection of the radio wave geometrically and optically, if the radio wave can be directly emitted to the required slave station at the required level, the influence of the delayed radio wave due to the reflection can be eliminated. For this reason, conventionally, a space diversity system has been adopted in which a large number of antennas are arranged at different positions and an antenna that is less affected by reflected radio waves is selected and switched.

[0004]

However, in the above-mentioned conventional method, in order to cope with an arbitrary indoor shape, the state of reflection of the radio wave from the master station in the room is investigated each time, and then multipath is used. Reduces the generation of harmful delayed waves
As described above, a specific design must be individually performed, resulting in high cost. Further, even when transmitting and receiving by the space diversity method, there is a problem that a large number of slave station side device structures are complicated and the cost is also increased.

Therefore, according to the present invention, the circle shape is changed according to the shape of the room.
Easy adjustments that minimize the effects of chipas
To realize an indoor wireless LAN system at low cost.
Aiming to provide an indoor wireless LAN antenna device capable of
And

[0006]

In order to achieve the above object, an indoor wireless LAN antenna apparatus according to the present invention is provided between a plurality of indoor slave stations and a single master station provided indoors.
The antenna device for indoor wireless LAN parent station used for indoor wireless LAN that performs wireless communication, A for accommodating the directional antennas so that made different radiation directions of directional antennas
In addition to having multiple antenna housings, each antenna housing
Radiation area from housed directional antenna must be indoors
Distributed antenna housing to cover a wide range of communication
Arranged structure (for example, spherical aggregate antenna body 1
1) and detachable from the antenna housing of the above structure
A directional master station antennas (for example, in unit antenna 12-15) accommodated in the accommodating each antenna housing portion of the structure
Tropism master station each individually regulated <br/> integer Possible radiation level adjusting means radiation level of the antenna (e.g., binding amount adjusting means for adjusting the rotation or sliding of the amount of binding between the antenna and the receiver) And

[0007]

In the present invention constructed as described above, the structure is
Directional master station antennas are placed in the antenna housings distributed in the structure.
Housing the antenna, the total radiation area of each directional master station antenna is
The indoor wireless LAN antenna device is placed as a body.
Covers the required communication range (slave station existence area)
it can. Therefore, according to the arrangement situation of slave stations in the chamber, by selective attachment of a directional master station antenna structure, enabling good radio transceiver in a distributed child station to the parent station in the room Become. In addition, the radiation level of each directional master station antenna can be adjusted individually by the radiation level adjusting means.
By adjusting to, it becomes possible to perform wireless transmission / reception with a radiation level suitable for the separation distance between the slave station and the master station.

[0008]

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

FIG. 1 is an external view showing an external appearance of an embodiment of an antenna device of the present invention including a spherical aggregate antenna body which is a structure for accommodating a plurality of antennas in a master station, and FIG. 2 is a spherical view of FIG. It is sectional drawing which shows the attachment cross section of a collective antenna body. In FIG. 1 and FIG. 2, 11 is a spherical aggregate antenna body, 12 to 15 are antennas, 16 is a ceiling finishing material, 17 is a spherical aggregate antenna body 11 and a parting edge fixed with a bolt, 18 is a transmitting / receiving section, 19 Is a connector for connecting the spherical aggregate antenna body 11 to a power source or another LAN, and 20 is a cable therefor.

The spherical collective antenna body 11 of this embodiment
For example, seven antennas can be radially mounted. Each of the antennas 12 to 17 has a characteristic (directivity) of transmitting or receiving in a certain range in each direction, and the mounting of these antennas is selected according to the arrangement situation of the slave stations in the room, and the spherical collective antenna body The radiation levels of the antennas 12 to 17 attached to the antenna 11 can be individually adjusted by the radiation level adjusting means. For example, the area directly below is covered by the antenna 12, and the communication areas in proper lateral directions are covered by the antennas 13 to 15 and the opposite antenna (not shown). The indoor wireless LAN device shown in FIG. 1 and FIG. 2 has a structure suitable for being installed in approximately the center of the room where the four side walls have the same length, but one side is more suitable than the other side. In a long horizontally long room or an indoor structure having a space partly entering as shown in FIG. 16,
In consideration of these indoor shapes, the antenna device may have an antenna direction and an arrangement direction determined in advance.

As described above, the indoor wireless LAN of the present invention
According to use the antenna device, the directional antenna serving antenna 12 to so that made different radiation directions of directional antennas
A plurality of antenna accommodating portions for accommodating 15 are provided, and
By the antennas 12 to 15 housed in the antenna housing section
So that the radiation area can cover the required communication range in the room
A structure is provided in which a spherical collective antenna body 11 is provided as a structure in which the antenna housings are arranged in a distributed manner , and
I installed it on each of the antennas 12 to 15 as station antennas.
Through the screw 33 and the screwing portion 32 provided in each antenna housing portion.
Since the antennas 12 to 15 are detachably accommodated, the antennas that can obtain a good communication state with the slave station arranged in the room are selectively used and unnecessary antennas are not used (removed from the antenna accommodating portion). In this case, it becomes possible for the master station and the slave station to carry out directional wireless communication suitable for the arrangement of the slave station, and the radiation level adjusting means (described later in detail) radiates the antennas 12 to 15 respectively. Level
Each individually adjusted, by adjusting the radiation level suitable for separation between the slave station and the master station Te following, it is possible to obtain an optimum radiation distribution characteristic of the distribution of room shapes and slave stations. Therefore, a plurality of indoor wireless LAN antenna devices are set in advance in which the number of antennas, the direction in which the antennas are arranged, and the adjustable radiation level range are set so that the structure corresponds to the standard indoor shape or the specific indoor shape. If the types are standardized, it is possible to easily obtain the radiation distribution characteristics suitable for an extremely wide variety of indoor structures, and the indoor wireless LAN system using the indoor wireless LAN antenna device according to the present invention as a master station is generally used. It is possible to improve the sex.

The transmitter 18 is connected to a power source (not shown) or another LAN via a cable 20 by a removable connector 19 and can be easily separated for repair or the like. The radio waves are radiated by inserting only the antenna of a required area among the unit antennas 12 to 15 along the body guide of the spherical collective antenna body 11 to connect to the transmitting / receiving unit 18. After the antennas 12 to 15 are installed, a semicircular spherical radome (not shown) is covered so that the LED lamps and the alarm lamps indicating the illumination and the antenna position can be confirmed from the outside and the maintenance and inspection are easy.

Next, detailed description will be made on a specific example in which the radiation level adjusting means capable of adjusting the radiation level of each antenna is embodied by the connection state between the unit antenna and the collective antenna body.
I will explain in detail.

FIG. 3 is a cross-sectional view showing a connection state between the unit antennas 12 to 15 and the collective antenna body 11. In the figure, 21 is a rectangular waveguide of the collective antenna body 11, 2
2 is coaxial, 23 is a probe, 24 is a feeding waveguide, 25 is a dielectric, 26 is an antenna cone horn as an antenna element portion formed on the front side of the rectangular waveguide 21, 27
Is a holding member for holding the coaxial in a slidable manner back and forth, 2
8 is a sliding member that also serves as a rotation guide and a slide guide for the rectangular waveguide 22 and the antenna conical horn 26, 29 is a joint material,
Reference numeral 30 denotes an annular adjusting member located on the front side of the antenna conical horn 26, 30a denotes a knob projection for rotating the adjusting member 30, and 31 denotes rotating the adjusting member 30 to the front side of the antenna conical horn 26. In this state, 32 is a threaded portion, 33 is a threaded thread, 34 is a connecting piece, and 35 is an outer tube.

In this way, the antenna has the conductor in the coaxial portion (not shown) in the axis of the conical horn 26, and this conductor is inserted into the feed wave waveguide to form the coaxial waveguide converter as a whole. The coupling in the waveguide is coupled by the electric field, and the coupling in the rectangular waveguide of the antenna is coupled by the magnetic field.

FIG. 4 is a perspective view showing the contact structure of the outer conductor of the coaxial portion 22, and the outer conductor is connected by the contact structure of the elastic metal as shown in the drawing. In the figure, 22, 23, 2
5 shows the same member as in FIG. 3, 41 is a feeding waveguide,
42 is a slit outer conductor sleeve, and 43 is a rectangular waveguide.

The structure of the horn of the horn antenna may be a conical shape or a rectangular shape as shown in FIG. 5, because the internal structure acts as an antenna, so that only a mechanical guide is required on the outside. But it can be used. For example, it suffices that the housing portion of the collective antenna body 11 and the outer shape of the antenna are in a fitted state and can be fixed after insertion. That is, as shown in the figure, for example, the protrusion 52 formed on the outer shape of the antenna 12 may be fitted into the guide recess groove 53 of the antenna housing 51.

According to the above-mentioned embodiment, the coupling amount between each of the antennas 12 to 15 inserted into the transmitting portion 18 of the spherical aggregate antenna body 11 as a structure and the receiving portion 18 is adjusted by rotating or sliding. By providing a coupling amount adjusting means capable of performing the above, it becomes possible to appropriately adjust the radiated power of the radio wave radiated from the antenna functioning as the transmitting / receiving means for transmitting / receiving the master station in the indoor wireless LAN. ˜15 can be adjusted and set to the amount of radiated power according to the separation distance from the slave station used for transmission and reception. Therefore, it is possible to provide an indoor wireless LAN antenna device that can reduce the influence of multipath and enhance the reception state of the slave station.

Next, a method of adjusting the radiated power while the antennas 12 to 15 are incorporated in the collective antenna body 11 will be described with reference to FIGS. 6 to 12.

FIG. 6 is a perspective view showing the connection structure of the feeding portion of the antenna horn, FIG. 7 is a perspective view showing the connection structure of FIG. 6 in detail, and FIG. 8 is a sectional view showing the connection structure in more detail.
9 is an exploded view of the connection structure of FIG. 8, FIG. 10 is an exploded view of the positioning groove portion shown in FIGS. 8 and 9, FIG. 11 is a similar exploded view, and FIG. 12 is a similar sectional view.

In FIG. 6 (a), 61 is, for example, a horn of the antenna 12, 62 is a connecting portion of a choke structure for connecting between the horn 61 and a waveguide for the next collective antenna body 11, and 63 is the above-mentioned waveguide. A tube, 64 is a rectangular waveguide of the horn 61. As shown, the horn 61 can take the form of a truncated cone horn or a truncated pyramid horn. The connecting portion 62 is 90 ° with respect to the rectangular waveguide 64 of the horn 61.
It is rotatable and is fitted and supported on the horn 61.
In the angle between the horn 61 and the waveguide 63 as shown, θ
The reflection loss is minimum when = 0 ° (see FIG. 6B), and the reflection loss is maximum when θ = 90 ° (FIG. 6).
(D)). Thus, by rotating the horn 61 of the antenna from the outside about the axis of the antenna, a mismatch loss occurs, and therefore, the coupling with the transmission / reception device 18 is changed and the radiated power is controlled. When the distance between the slave station and the master station is small, the angle θ is set so as to give the minimum required radiated power.
Is changed. The antenna (for example, 12) of the master station when there is no target slave station is set to 90 ° so that the attenuation of the radiated power is maximized.

As in the above embodiment, by forming a discontinuity between the rectangular waveguide 64 of the horn 61 and the waveguide 63 on the body side, the antenna and the transmitter / receiver by the discontinuity are formed. It is possible to change the amount of reflection loss by the effect of mismatching with the waveguide. Therefore, it becomes possible to appropriately adjust the radiated power of the radio waves radiated from the antennas, and each of the antennas 12 to 15 can be adjusted and set to the radiated power amount according to the distance from the slave station used for transmission and reception. This can reduce the influence of multipath.

Similar to FIG. 6, FIG. 7 shows another embodiment in which the radiation power can be adjusted by rotating the horn 61. In FIG. 6 (a), 71 is a fitting and pivoting groove provided in the connecting portion 62, and 72 is a fitting and locking portion 7 that can be fitted into the fitting and pivoting groove 71.
Reference numeral 73 denotes a tapered outer tube, 73 denotes a circular waveguide of the horn 61, and 74 denotes a flat resistive thin film plate arranged in the circular waveguide 73. The horn 61 can be appropriately rotated while the fitting locking portion 72a of the tapered outer tube 72 is fitted in the fitting pivoting groove 71 of the connecting portion 62. Here, the electric field (E) of the radio wave propagating in the circular waveguide 73 and the resistive thin film plate 74 are orthogonal (θ = 9).
0 °), the amount of attenuation of the radiated power becomes minimum (see FIG. 7B), and when the electric field and the resistance thin film plate 74 are parallel (θ = 0 °), the resistance thin film plate 74 The effect maximizes the attenuation of the radiated power (see FIG. 7D).

As described above, the resistive thin film plate 74, which is a wave absorber plate with the wave absorber attached, is arranged in the antenna, and the range from the state parallel to the electric field of the radiated radio wave to the state orthogonal to the electric field. By appropriately rotating the resistance thin film plate 74, the amount of radio waves absorbed by the resistance thin film plate 74 can be adjusted, and thus the amount of radiated power can be adjusted. Therefore, by adjusting the radiation power according to the slave station which the antenna transmits and receives, it is possible to reduce the influence of multipath and enable good wireless communication.

FIG. 8 and FIG. 9 show in detail the structure in the case of rotating the horn 61 relative to the waveguide 63, like the connection portion 62 of FIG. 6 or FIG. It is a thing. In FIG. 8, 81 is a waveguide on the horn 61 side, 82 is a waveguide on the skeleton side, 83 is a flange fixed to the horn side waveguide 81 by welding, and 84 is fixed to the waveguide 81 by welding. Numeral 85 is an assembling tightening ring member having an arcuate groove in the range of a central angle of 90 ° for tightening at the time of connecting and assembling the horn side waveguide 81 and the waveguide 82.
6 is a stop positioning member that determines a position where the rotation of the horn 61 is stopped, 87 is a stop screw that fixes the stop positioning member 86 to the collar 84, and 88 and 89 are rotations of the horn-side waveguide 81 with respect to the waveguide 82. An annular corrugated plate ridge material and a sliding material for facilitating the same, 90 a sliding material for the horn side waveguide similarly, and 91 a thin resistance film plate such as mica. The length in the axial direction of the inner peripheral annular portion 84a of the collar 84 and the drilling depth of the inner peripheral groove 84b are λ / 4 (λ: wavelength of radio wave), respectively. The junction between 81 and the waveguide 82 on the side of the frame is designed to be the short-circuit termination. Further, by using the thin resistance film plate 91, when the feed waveguide part of the horn 61 is a circular waveguide, the angle between the electric field and this resistance film plate 91 is changed to absorb and attenuate the radio wave.
Adjust so that there is less reflection from indoor walls.

10 to 12 show another example of the structure of the connecting portion. The circular waveguide 102 of the horn 101 and the waveguide 103 on the body side are connected in a relatively rotatable state. It is a thing. In order to do so, the connecting pipe portion 105 is formed at the body side end of the tapered outer pipe 104, and the connecting pipe portion 105 is formed.
Positioning holes 106 are formed in the circumferential direction of the
With the flange 107 composed of a and the ring member 107b covered on the outer periphery of the connection pipe portion 105, the positioning bolt 108 is inserted into the bolt insertion hole 107c formed at a proper position on the outer periphery of the flange 107.
Are screwed together so that the end portion of the positioning bolt 108 faces the positioning hole 106. Then, by rotating the horn 61, the circular waveguide 102
By changing the angle between the thin-film resistance plate 109 arranged inside and the electric field of the radio wave, the amount of radio wave radiation is adjusted appropriately. The end of the circular waveguide 102 of the horn 61 is fitted in the socket 107d of the collar 107.

Next, a method of providing a damping plate of a resistive film on the waveguide portion of the antenna and rotating the damping plate to adjust the electric field strength and thus the radiated power will be described. In this case, attach the antenna to the collective antenna body, and also connect the transmission part, and from the opening of the antenna where you need to adjust the radiated power, use a low dielectric material such as styrene foam that fits into the internal shape of the antenna. The attenuation plate formed on the waveguide part by the resistance film is rotated to adjust the angle between the electric field and the resistance film.

FIG. 13 is a perspective view showing the structure of the antenna waveguide part for schematically explaining this method, FIG. 14 is a perspective view showing the structure of FIG. 13 in detail, and FIG. 15 is a sectional view.

In FIG. 13, the waveguide section 11 of the antenna is shown.
The resistance film plate 112 is attached in a form of being inserted in 1, and is rotated by the knob 113. 14 is shown in FIG.
13 shows in detail the rotating mechanism of No. 1, 121 is an antenna frame, 122 is a radio wave phase plate equipped with a dielectric plate corresponding to the resistance film plate 112 of FIG. 13, and 123 is this potential phase plate 12
An electric motor incorporating a speed reducer for rotating the motor 2, 124 is a rotary sliding mechanism that transmits the rotational force of the electric motor 123 to the phase plate 122, and 125 to 128 mechanically couple the electric motor 123 and the rotational sliding mechanism to transmit the rotational force. Are gears, tooth profiles, rotary feed ring members, and rotary power transmission rotary arms (for example, made of vinyl chloride). Reference numeral 129 is a front end portion of the annular rotation mechanism base, and 130 is a sliding through groove.

According to the embodiments shown in FIGS. 13 to 14, the phase of the radio wave radiated from the antenna is changed by synthesizing by rotating the radio wave phase plate 122 equipped with the dielectric plate. The radiation directivity can be changed.

[0031]

As described in the foregoing, according to the antenna device for indoor wireless LAN of the present invention, A to accommodate the directional antennas so that made different radiation directions of directional antennas
In addition to having multiple antenna housings, each antenna housing
Radiation area from housed directional antenna must be indoors
Distributed antenna housing to cover a wide range of communication
A structure formed by arranging, detachably and directional master station antennas to be accommodated, emission of directional master station antenna housed in the antenna housing portion of the structure with respect to the antenna accommodating portion of the structure By providing the radiation level adjusting means capable of individually adjusting the level, it becomes possible to easily adjust the radiation direction and the radiation level by the master station directional antenna. Therefore, by adjusting the radiation distribution characteristic suitable for the arrangement of the slave stations, it is possible to perform good wireless communication while reducing the generation of harmful delayed waves due to multipath. Moreover, since there is a high degree of freedom in the radiation distribution characteristics that can be changed according to the indoor shape and the arrangement of the slave stations, even if the arrangement of the slave stations changes due to changes in the indoor layout, for example, it is possible to adapt to the environment. It is easy to adjust to a specific radiation distribution. Further, by preparing a plurality of types of structures corresponding to the respective radiation regions in advance so that desired radiation regions can be obtained according to the interiors of various shapes, standardization becomes possible as a whole and Since the number of slave stations can be simplified, miniaturized, and cost-effective,
An indoor wireless LAN antenna device capable of constructing an economical indoor wireless LAN system can be provided.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an appearance of an embodiment of an antenna device of the present invention.

FIG. 2 is a sectional view taken along the line II-II of FIG. 1 in a state where the spherical collective antenna body is attached to the ceiling wall.

FIG. 3 is a cross-sectional view showing a connection state between a unit antenna and a collective antenna body in the embodiment of FIG.

FIG. 4 is a perspective view showing a contact structure of a rotating portion of the embodiment of FIG.

FIG. 5 is a perspective view illustrating a method of fitting the antenna and the antenna housing portion.

FIG. 6 (a) is a perspective view showing a connection structure between a rectangular waveguide of a horn and a rectangular waveguide of a power feeding section. (B) It is a figure which shows the reflection loss when the angle (theta) which the rectangular waveguide of a horn and the rectangular waveguide of a electric power feeding part make is 0 degree. (C) It is a figure which shows the reflection loss when the angle (theta) which the rectangular waveguide of a horn and the rectangular waveguide of a electric power feeding part make is 45 degrees. (D) It is a figure which shows the reflection loss when the angle (theta) which the rectangular waveguide of a horn and the rectangular waveguide of a electric power feeding part make is 90 degrees.

FIG. 7 (a) is a partially cutaway exploded perspective view showing the outline of the connection structure between the circular waveguide of the horn and the waveguide of the power feeding section. FIG. 6B is a diagram showing an attenuation state when the angle θ between the resistive thin film plate and the electric field in the circular waveguide of the horn is 90 °. FIG. 6C is a diagram showing an attenuation state when the angle θ formed by the resistive thin film plate in the circular waveguide of the horn and the electric field is 45 °. (D) It is a figure which shows the attenuation | damage state when the angle (theta) which the resistance thin film board and the electric field in the circular waveguide of a horn make is 0 degree.

FIG. 8 is a schematic vertical cross-sectional view showing a connection structure between a horn waveguide and a skeleton waveguide.

9 is an exploded perspective view of the connection portion of FIG.

FIG. 10 is an exploded perspective view showing another embodiment of the connection structure of the waveguide of the horn and the waveguide on the body side.

FIG. 11 is another exploded perspective view of the embodiment of FIG.

12 is a vertical cross-sectional view of the embodiment in FIGS. 10 to 11. FIG.

FIG. 13: By adjusting the angle formed between the electric field and the resistive thin film plate provided from the waveguide of the horn to the waveguide on the body side,
It is a perspective view which shows the method of adjusting the radiation intensity from an antenna.

FIG. 14 is a perspective view of an antenna having a structure in which a dielectric plate or a resistance plate is rotated by a driving mechanism.

FIG. 15 is a front view of the antenna with the drive mechanism of FIG.

FIG. 16 is an explanatory diagram of an arrangement state of a parent station and a plurality of child stations of a conventional wireless LAN.

FIG. 17 is an explanatory diagram showing a conventional radio wave propagation state.

FIG. 18 is a similar explanatory view.

[Explanation of symbols]

 11 Spherical Collective Antenna Body 12 to 15 Antenna 18 Transceiver 21 Rectangular Waveguide 22 Coaxial Section 26 Antenna Cone Horn 61 Antenna Horn 62 Connection Section 63 Waveguide 81 Horn Side Waveguide 82 Body Side Waveguide Inner Tube 83,84 Tsuba 91 Resistance film plate 111 Antenna waveguide part 112 Resistance film plate 121 Antenna sales body 122 Radio wave phase plate 123 Electric motor 124 Rotational sliding mechanism

Claims (1)

(57) [Claims] 1. A plurality of slave stations provided indoors and a single station provided indoors
The antenna device for indoor wireless LAN parent station used for indoor wireless LAN that performs wireless communication with the one master station, directed against so that made different radiation directions of directional antennas
Having a plurality of antenna housings for housing antennas
In addition, the radiation area of the directional antennas housed in each antenna housing can cover the required communication range in the room.
A structural body formed by distributed antenna accommodating portion, detachably accommodated with respect to the antenna accommodating portion of the structure
And a radiation level adjusting means capable of individually adjusting the radiation level of each of the directional master station antennas housed in each antenna housing portion of the above structure. An indoor wireless LAN antenna device.