JPS58198903A - Radio wave reflecting device - Google Patents

Abstract

PURPOSE:To eliminate influence upon lighting, etc., although a radio wave of ultrahigh frequency is reflected, by opposing glass plates to each other and filling the gap between the glass plates with liquid which reflects a radio wave while allowing visible light to pass through it. CONSTITUTION:In a figure, 1 and 2 are the glass plates, 3 is the liquid filling the gap between the glass plates 1 and 2, and 4 and 5 are spacers; and 6 and 7 are fixed frames, and 8 is an elastic cap made of an elastic material such as rubber, etc., for absorbing the expansion and contraction of the liquid 3. Although the glass plates allow visible light and a radio wave of ultrahigh frequency to pass through them, the liquid 3 such as water reflects the radio wave of ultrahigh frequency while allowing the visible light to pass through it. Thus, the gap between the glass plates 1 and 2 is filled with the liquid 3 such as water to transmit the visible light while reflecting the radio wave of ultrahigh frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a radio wave reflecting device that transmits visible light and reflects ultra-high frequency radio waves.

BACKGROUND OF THE INVENTION 2. Description of the Related Art Recently, with the development of microwave and millimeter wave IR communications, there has been an increasing demand for installing a radio wave reflecting device inside a building or on the wall of a building to change the propagation path of radio waves. Conventional radio wave reflecting devices used metal plates, so
Visible light is not given much attention, and if it is installed near a window, the room will be dark (1), and if it is installed indoors, it will affect the indoor lighting.

OBJECTS OF THE INVENTION The present invention aims to reflect ultra-high frequency radio waves but allow visible light to pass through so as not to affect illumination or the like. Examples will be described in detail below.

Embodiment of the Invention FIG. 1 is a sectional view of an embodiment of the invention. 2 is a glass plate, 3 is a liquid such as water filled between the glass plates 1 and 2, 4
．． 5 is a spacer, 6.7 is a fixed frame, and 8 is an elastic cap made of an elastic material such as rubber for absorbing the expansion and contraction of the liquid 3. A glass plate can transmit .mu.m visible light and ultra-high frequency radio waves 1, while a liquid such as water 3 can transmit visible light but reflect ultra-high frequency radio waves. Therefore, by sealing a liquid 3 such as water between the glass plates 1 and 2 facing each other via spacers 4 and 5, visible light can be reduced by 1fii! It is possible to configure a radio wave reflection device that reflects ultra-high frequency radio waves.

(2) Normal glass plate is 50GH when the thickness is 3III11
The transmission loss in z is about 2 dB, and the reflection is also very small. In contrast, seawater undergoes almost total reflection.

FIG. 2 is a sectional view of another embodiment of the present invention, showing a glass plate 1.
2 are fused using low melting point glass or the like via a space of +4.5 mm, and a liquid 3 such as water is sealed between the glass plates 1 and 2. In this case, the glass plate 1 due to the expansion and contraction of the liquid 3.
If the strength of 2 is a problem, an elastic cap 8 may be provided as in the embodiment shown in FIG.

Also, to facilitate installation, a frame may be provided for the peripheral holding attachment.

FIG. 3 shows a cross-sectional view of yet another embodiment of the invention, in which glass plates 1.2 are arranged facing each other with spacers 4' and 5' interposed therebetween,
Spacers 4° and 5° are formed with an outflow L and an inlet for liquid 3 such as water, so that liquid 3 can flow in at any time or at any time.
A spill takes place. In this case, one or both of the glass plates 1 and 2 are made of infrared absorbing glass, and the heat generated by absorbing the infrared rays (3) contained in natural light increases the temperature of the liquid 3 such as water by -L. By supplying this heated liquid 3 to a boiler or the like, it is possible to effectively utilize energy.

Figure @4 shows an example of application of the radio wave reflecting device according to the embodiment of the present invention described above, in which the radio waves transmitted from the ultra-high frequency transmitting/receiving device 12 via the antenna II are transmitted through the window glass 13 to the outside. The radio waves are emitted, reflected by the radio wave reflecting device 10 installed outside the window, and propagated downward parallel to the wall of the building. Further, radio waves from the outside are reflected by the radio wave reflection device 10 and are incident on the antenna 11. Furthermore, as shown by the two-point ui line, natural light passes through the radio wave reflection device and enters the room, so the room does not become dark.

Note that ■4 indicates a desk. In this way, the radio wave reflecting device 1o installed outside the window will serve as an eaves, and the window glass I3 will not get wet during rain, so the radio waves transmitted through the window glass 13 will be attenuated by the rainwater. There are no advantages.

FIG. 5 is an explanatory diagram of the case (4) in which the radio/wave reflecting device 10 is installed indoors, and the ultra-high frequency transmitting/receiving device 1 on the desk 18.
The radio waves sent out from the antenna 15 from the antenna 15 are reflected by the radio wave reflection device IO attached to the ceiling, propagate along the ceiling, are reflected by another radio wave reflection device, and are sent to an antenna on another desk (not shown). ). Illumination light from a fluorescent light 17 attached to the ceiling passes through a radio wave reflection device 10 and reaches the desk 1.
8, the radio wave reflecting device 10 is placed above the desk 18.
Even if you install it, the desk will not become dark.

FIG. 6 is an explanatory diagram when the radio wave reflecting device 10 is attached to the window of a building, and the radio waves between the antennas 20 and 21 are reflected by the radio wave reflecting device 10 attached to the window of another building and propagated. communication between different floors of a building. Also indoor antenna 22.23
Even if the radio waves leak toward the window when communicating between the two, by attaching the radio wave reflecting device 10 to the window, the radio waves will not leak outside, making it possible to maintain secrecy.

Furthermore, since the radio wave reflecting device 10 transmits visible light (5), even if the radio wave reflecting device 1° is provided in place of window glass, the room will not become dark. In this way, when the radio wave reflecting device 10 is provided instead of the window glass, if infrared absorbing glass is used and the liquid 3 is circulated as in the embodiment shown in FIG. This makes it possible to utilize the thermal energy of the liquid, which results in an energy-saving effect.

The liquid 3 to be filled between the glass plates 1 and 2 is selected in consideration of the radio wave reflection conditions, and it is desirable to have high conductivity, so ionized water such as seawater is more suitable than pure water. . Other liquids can be used with impurities mixed in to increase their conductivity.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a liquid such as water, which transmits ultra-high frequency radio waves and visual rays, between the glass plates 1 and 2 which transmits ultra-high frequency radio waves and visual rays. (6) When installed indoors as well as outdoors, it has the advantage of not interfering with the incidence of natural light or (6) illumination by illumination lights. Therefore, even if it is mounted on a desk or a window, it will not affect the indoor lighting due to the reflection of radio waves for ultra-high frequency communication indoors or the reflection of ultra-high frequency communication from indoors to outdoors. It also has the advantage of being economical since it can also be used as window glass.

[Brief explanation of the drawing]

FIGS. 1 through gIA3 are sectional views of different embodiments of the present invention, and FIGS. 4 through W2B are explanatory diagrams of application examples of the radio wave reflecting device of the present invention. 1.2 is a glass slope, 3 is a liquid such as water, 4.5 is a spacer, 6.7 is a fixed frame, 8 is an elastic cap, IO is a radio wave reflecting device, 11, 15.20, 21° 22.23 are It's an antenna. Patent Applicant: Fujitsu Ltd. Representative Patent Attorney Gobe Tamamushi, 3 others (7) Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] (1) A radio wave reflecting device characterized in that glass plates are arranged facing each other and a liquid that transmits visible light and reflects radio waves is filled between the glass plates. (The radio wave reflecting device according to claim 1, characterized in that it is made of a 21 mil rattling glass plate and external ray absorbing glass.