JPH03133220A - Transmitter for high frequency electric signal - Google Patents

Abstract

PURPOSE:To attain contactless signal transmission by using electrostatic induction between two charged metallic plates opposite to each other having a barrier in between. CONSTITUTION:A radio wave signal received by an outdoor antenna 1 is delivered to outdoor metallic plates 4,5 through an outdoor cable 2 and a change in the charge is caused on the surface of the metallic plates. Indoor metallic plates 6,7 opposite respectively to the outdoor metallic plates 4,5 cause a change in the charge corresponding to the change in the charge of the outdoor metallic plates 4,5 on the surface by the electrostatic induction, the high frequency electric signal received by the indoor antenna 1 is delivered to the indoor metallic plates 6,7 and the signal is sent to an antenna terminal 9 of a television receiver 10 through an indoor cable 3 from the indoor metallic plates 6,7.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-frequency electric signal transmission device, and is a signal transmission device that enables non-contact signal transmission between partition walls by electrostatic induction when partition walls, etc. are present. It is related to.

[Prior Art] Conventionally, in a signal transmission device for receiving radio waves with an antenna and transmitting them as high-frequency electrical signals to a receiver via a cable, if a partition wall exists, a hole is formed in the partition wall. The methods used include opening the bulkhead and passing the cable through, or bypassing the bulkhead and bypassing the cable.

[Problems to be solved by the invention] However, drilling a hole in a partition wall is laborious and may be difficult to construct, and if the cable is routed around, the cable length becomes longer and the resistance increases accordingly. There was a problem that the signal was attenuated.

The present invention has been made to solve the above-mentioned problems, and makes it possible to easily transmit signals between partition walls by utilizing the electrostatic induction effect between metal plates arranged oppositely with partition walls in between. The purpose of the present invention is to provide a transmission device for high-frequency electrical signals.

[Means for Solving the Problems] In order to achieve this object, the present invention provides a signal transmission device that transmits high-frequency electric signals of radio waves to a receiver using a cable, in which the cable is divided at a partition wall, and the cable is divided at a partition wall. Charged metal plates are provided on both sides facing each other so as to produce an electrostatic induction effect, and the cables are respectively connected to both metal plates.

[Function] In the present invention having the above configuration, when a high frequency electric signal is supplied from a cable to one metal plate, static electricity is generated between the metal plate and the other metal plate facing across the partition. An induction effect occurs, and an electric signal is induced in the other metal plate, and the high-frequency electric signal is transmitted between the partition walls without contact.

[Example] Hereinafter, an example embodying the present invention will be described with reference to FIGS. 1 and 2.

First, the overall configuration of this embodiment will be explained with reference to FIG. It is connected to an outdoor metal plate 4.5 opposite the metal plate 6.7. All four of the outdoor metal plates 4.5 and the indoor metal plates 6.7 are formed in the same shape and are attached, for example, with adhesive or tape (as shown). One end of the indoor cable 3 using a coaxial cable or parallel two-wire cable is connected to an indoor metal plate 6.7,
The other end is connected to the antenna terminal 9 of the television receiver 10.

Next, the operation of this embodiment will be explained with reference to FIGS. 1 and 2.

The radio wave signal received by the outdoor antenna 1 is transmitted to the outdoor metal plate 4.5 through the outdoor cable 2, causing a change in charge on the surface of the metal plate. The indoor metal plates 6 . 7 facing the outdoor metal plates 4 . The high-frequency electrical signal is transmitted to the indoor metal plate 6.7, and further transmitted from the indoor metal plate 6.7 to the antenna terminal 9 of the television receiver 8110 through the indoor cable 3.

Next, the setting of the area of the outdoor metal plate 4.5 and the indoor metal plate 6.7 used in this example will be explained.

The radio signal from the outdoor antenna 1 is transmitted to the UHF band (4
70 to 770 MHz), the outdoor cable 2 and the indoor cable 3 are 2000 parallel two-wire cables, and the signal attenuation by using the metal plates 4 to 7 is 1/2 (approximately 6 dB) or less. The capacitance reactance of a parallel plate capacitor formed from a metal plate should be 100Ω or less if edge effects are ignored.When the relative dielectric constant of the window glass 8 is εγ==5 and the thickness is IIm, the metal plate The area of tJ is approximately 0°8- to cover the entire HP band.
Therefore, under the above conditions, the area of the metal plate should be 5 cm x 4 cm (20 cm).
>, the capacitive reactance is approximately 4Ω. Further, the signal attenuation is about 0.43 dB, which is an amount of attenuation that poses no problem in practical use.

Next, the separate room of this invention will be explained with reference to FIG.

This separate space fits and fixes the outdoor metal plate 4.5 into the engagement recess 21a of the mounting plate 21 made of an insulating material, and
A connection terminal 22 for the outdoor cable 2 is drawn out, while an adhesive 23 is applied to the mounting surface of the mounting plate 21,
When not in use, a transparent sheet 24 is placed on the surface of the adhesive 23.
is glued.

In this separate space, the sheet 24 can be peeled off and the mounting plate 21 can be easily attached to the window glass 8 using the adhesive 23.

Note that the present invention is not limited to the embodiments detailed above, and various changes can be made without departing from the spirit of the invention.6For example, in the present embodiment,
A 200Ω parallel two-wire cable is used, but a 75Ω coaxial cable can also be used. Furthermore, the partition wall can be made of thin walls other than window glass.

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, non-contact signal transmission is possible by using electrostatic induction between rechargeable metal plates facing each other across a partition wall. Therefore, there is an effect that the cable can be drawn in in a case where there is a partition wall using a simpler method than in the past.

[Brief explanation of the drawing]

1 and 2 show an embodiment embodying the present invention. FIG. 1 is a perspective view of the entire embodiment, FIG. 2 is a sectional view of a non-contact signal transmission section, and FIG. FIG. 2 is a perspective view showing a separate part of the present invention. 2...Outdoor cable, 3...Indoor cable, 4.5
...Outdoor metal plate, 6.7...Indoor metal plate, 8...
Window glass as a bulkhead.

Claims (1)

[Claims] 1. In a signal transmission device that transmits high-frequency electrical signals of radio waves to a receiver via a cable, the cable is divided at a partition wall, and charged metal plates are placed on opposite sides of the partition wall so as to produce an electrostatic induction effect. 1. A high-frequency electrical signal transmission device, characterized in that the cable is connected to both metal plates.