JPS6064499A - Radio wave nonreflecting room - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] In this system, the inner wall surface of the chamber has a rotating rectangular surface formed of metal that reflects radio waves, and a radio wave non-reflector is installed at one focal point of the inner wall surface of the room. However, by making it possible to install an antenna at another focal point, it is possible to absorb the radio waves emitted from the antenna installed at this point without reflecting it back to the antenna.
It is related to a radio wave no-reflection room.

A conventional device of this type is shown in FIG.

(1) is the inner wall surface of the radio wave non-reflection room, (2) is the radio wave absorber attached along the wall surface, and (3) is the antenna installed in the room. Also, (4) to (6) are arrows that disturb the direction of travel of radio waves emitted from the antenna, and (4a) (5a)
) (6a) is the collision point between the radio wave and the radio wave absorber.

Next, the operation of the conventional radio wave non-reflection chamber will be explained.

The radio waves emitted from the antenna (3) travel in any direction indoors, for example in the directions shown by arrows (4), (5), and (6).
Each collides with a radio wave absorber (3) attached to the indoor wall.

Radio wave absorber (3)K The collided radio waves are converted into thermal energy etc. by the radio wave absorber (3) and are absorbed without being reflected as radio waves. Since this absorption is performed on the radio waves that have traveled in all directions, the radio waves will not be reflected back to the antenna (3), and the antenna (3) will be installed in an infinite free space in terms of radio waves. It is possible to create a state equivalent to the state that was created.

Since the conventional radio wave reflection-free room is configured as described above, it is necessary to absorb the radio waves emitted from the antenna (3) in any direction of travel, so an 11:1 radio wave absorber is installed all over the room. In addition, since the angle of incidence of the radio waves on the radio wave absorber is arbitrary, it is often difficult to match the radio wave absorber to the radio waves.

This invention was developed in order to eliminate the drawbacks of the conventional ones as mentioned above.The interior surface is made of a circular rotating tank made of metal that reflects radio waves, and a radio wave absorber is installed at one focal point of the column. By doing so, the radio waves emitted from the antenna installed at other focal points are reflected by the circular surface of the rotating tank toward the focal point where the radio wave absorber is installed, and in order to absorb the radio waves, a large number of expensive radio wave absorbers are installed. It is an object of the present invention to provide a radio wave reflection-free chamber that is not necessary and can be easily matched to radio waves because the direction of incidence of radio waves on the radio wave absorber is radial.

An example of this invention will be described below with reference to the drawings.

In Figure 2, (1) is a rotating tank circular surface formed of metal that reflects radio waves and rotated around an axis that includes the focal point, (2) is a radio wave absorber installed at the focal point of the rotating tank circular surface, (3 ) is the antenna installed at the other focal point, (4) is one direction of the radio waves emitted from the antenna (3), (4a) is the reflection point of the radio waves in that direction on the circular surface of the rotating tank, and (4b) is the Directions of reflected radio waves, (5) (5a) (5b) and (6) (6a)
(6b) are the reflection points and reflection directions in different radial directions, (7) is the focal point of the rotating tank circular surface, (8) is the other focal point, (9) is its midpoint, and (lO) is the straight line. (7) (8
) and the rotating tank circular surface, (11) is (9)
It is the line of intersection between the axis perpendicular to (10) and the circular surface of the rotating tank.

Next, the principle of operation of this invention will be explained. The radio waves emitted from the antenna (3) can be sent to any direction within the room, such as (4), (5).
) and (6), and collide with the circular surface of the rotating tank at (4a), (5a), and (6a), respectively. The colliding radio waves are (4b) (sb) (6
It is reflected in the direction b). (4b) (5b) (6b)
Since the reflecting surface (1) is a rotating tank circular surface, all of the directions are directed toward the focal point (7). Focus (radio wave absorber for power (2)
is installed, all radio waves reflected in the directions (4b), (5b), and (6b) are absorbed by this radio wave absorber.

Since the above reflection and absorption are applied to the radio waves emitted from (3) in all directions, there is no longer any reflection of radio waves to the antenna (3), and the antenna (3) is transformed into an infinite free space in terms of radio waves. In addition, the reflected radio waves to the focal point (7) will be incident from a radial direction.

In addition, in the above embodiment, the indoor surface is a circular rotating tank, but as shown in FIG. In this case, the ceiling and the gate are constructed of radio wave absorbers.

As mentioned above, according to this report [15], the inner surface of the chamber is a circular rotating tank made of metal that reflects radio waves, and because a radio wave absorber is installed at one focal point, a large amount of expensive A radio wave reflection-free room for antennas installed at other focal points can be obtained without using a radio wave absorber. Also, since the direction of the radio waves incident on the radio wave absorber is radial, the absorber's
Matching to waves is also easy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional radio wave reflection-free chamber, FIG. 2 is a perspective view of a radio wave reflection-free chamber according to an embodiment of the present invention, and FIG. 3 is a radio wave reflection-free chamber showing another embodiment of the present invention. FIG. In the figure, (1)...Indoor surface, (2)...Radio wave absorber, (3)...Antenna, (4)...One radiation direction of radio waves, (5)...Other radio waves. One direction of radiation, (6)...Other directions of radiation of radio waves, (4a) (5a) (6a)
-Reflection points of radio waves, (4b) (5b) (6b)--
Direction after reflection of radio waves, (7)...One focus in the column,
(8)...Other focal points in the column, (9)...midpoint in the column, (lO)...line of intersection between the rotating tank circular surface and the plane containing the focal point in the column, (11 )...The intersection line between the rotating tank circular surface and the plane perpendicular to the axis that includes the midpoint in the column and the focal point in the column. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 Procedural Amendment Form R Flesh) 1, 1f! Display 1 fl-Nanaki j8-17482
No. 1 No. 2, Name of the invention M-wave non-reflection chamber 3, Person making the amendment Representative Hitoshi Katayama Section 4, Agent 5, 7 + [i. 1 Correct answer] Correct the detailed description as follows. ) Lonigi Kaede (2) Figure 2 of the drawing is corrected as shown in the attached sheet. 7. List of attached documents (1) Figure 2 1 or more copies Figure 2

Claims (1)

[Claims] The interior wall of the room is circular and made of metal that reflects radio waves, and a radio wave absorber is installed at one focal point within the column, and an antenna is installed at the other focal point. Room.