JP2000353915A - Reflector antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate shielding of an electromagnetic wave emitted from an emitter due to a stay and a sub-reflection mirror by reflecting with the sub-reflection mirror in which there is arranged a plurality of recessed curved surfaces transformed in a circumference direction seen from a center of a sub-reflection mirror and in a recessed direction by the sub-reflection mirror arranged in a recessed form and reflecting them again by a main reflection mirror which has the plural recessed curved surface transformed in a projecting direction in the circumference direction seen from a center of the main reflection mirror. SOLUTION: When an electric magnetic wave 5 radially emitted from an emitter 4 is reflected by a sub-reflection mirror 2, it is narrowed at a place remote from a center of a main reflection mirror 1 and is directed towards the main reflection mirror 1 while extending itself again. When the electromagnetic wave 5 is reflected by the main reflection mirror 1, it becomes parallel and is emitted in a target direction. Therefore, since the electromagnetic wave 5 is deviated from a center of the main reflection mirror 1, the electromagnetic wave 5 reflected at the mirror 1 is not shielded by the sub-reflection mirror 2. A stay 3 is provided in a direction where a curved surface of the sub-reflection mirror 2 crosses from a position where a curved surface of the main reflection mirror 1 crosses and the electromagnetic wave 5 reflecting at the main reflection mirror 1 is not shielded by the stay 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector antenna including a main reflector, a sub-reflector, and a radiator.

[0002]

2. Description of the Related Art FIG. 17 is a view for explaining a reflector antenna conventionally constituted by using a main reflector, a sub reflector and a radiator, wherein 1 is a main reflector, 2 is a sub reflector. Reference numeral 3 denotes a stay for supporting the sub-reflection mirror 2, and reference numeral 4 denotes a radiator. Electromagnetic wave 5 radially radiated from radiator 4
Are reflected by the sub-reflection mirror 2. Since the sub-reflecting mirror 2 has a concave curved surface, the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 is reflected by the main reflecting mirror 1 again while being spread again after being narrowed. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 reflected by the main reflecting mirror 1 while spreading are parallel and emitted in a target direction.

[0003]

FIG. 18 shows a view of FIG. 17 as viewed from the sub-reflector 2 to the main reflector 1. In FIG. 17, the electromagnetic wave 5 reflected by the main reflecting mirror 1 crosses the sub-reflecting mirror 2. In FIG. 18, a part of the electromagnetic wave 5 reflected by the sub-reflection mirror 2 intersects the stay-3. As described above, the sub-reflecting mirror 2 and the stay-3 have a disadvantage that they block a part of the electromagnetic wave 5 from being emitted in a target direction.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and to provide a reflector antenna in which a stay of an electromagnetic wave radiated from a radiator and a shield by a sub-reflector are removed.

[0005]

According to the first aspect of the present invention, the electromagnetic wave radiated from the radiator is formed by forming a plurality of concave curved surfaces which are concavely deformed in the circumferential direction when viewed from the center of the sub-reflector. The light is reflected by the disposed sub-reflecting mirror, and is reflected again by the main reflecting mirror having a plurality of concave curved surfaces deformed in the convex direction in the circumferential direction when viewed from the center of the main reflecting mirror, thereby forming the portion of the sub-reflecting mirror and the stay. It is designed to be able to fire in the desired direction, avoiding the problem.

According to the second aspect, the electromagnetic wave radiated from the radiator is a sub-reflection in which a plurality of concave curved surfaces deformed in a concave direction in a circumferential direction as viewed from the center of the sub-reflector are arranged in a concave shape. Reflected by the mirror and reflected again by the main reflecting mirror having a plurality of concave curved surfaces deformed in the circumferential direction when viewed from the center of the main reflecting mirror, avoiding the sub-reflecting mirror and the stay, It is designed to fire in the desired direction.

According to the third aspect, the electromagnetic wave radiated from the radiator is a sub-reflection in which a plurality of convex curved surfaces deformed in a concave direction in a circumferential direction as viewed from the center of the sub-reflector are arranged in a concave shape. Reflected by the mirror, reflected again by the main reflecting mirror having a plurality of concave curved surfaces deformed in the convex direction in the circumferential direction when viewed from the center of the main reflecting mirror, avoiding the sub-reflecting mirror and the stay, It is designed to fire in the desired direction.

According to the fourth aspect, the electromagnetic wave radiated from the radiator is a sub-reflection in which a plurality of convex curved surfaces deformed in a concave direction in a circumferential direction as viewed from the center of the sub-reflector are arranged in a concave shape. Reflected by the mirror and reflected again by the main reflecting mirror having a plurality of concave curved surfaces deformed in the circumferential direction when viewed from the center of the main reflecting mirror, avoiding the sub-reflecting mirror and the stay, It is designed to fire in the desired direction.

According to the fifth aspect, the electromagnetic wave radiated from the radiator is a sub-reflector in which a plurality of concave curved surfaces deformed in a convex direction in a circumferential direction as viewed from the center of the sub-reflector are arranged in a convex shape. Avoid the sub-reflector and the stay part by reflecting off the reflector and re-reflecting on the main reflector having a plurality of concave curved surfaces deformed in the convex direction in the circumferential direction when viewed from the center of the main reflector. , So that it can be fired in the desired direction.

According to the sixth aspect, the electromagnetic wave radiated from the radiator is a sub-reflector in which a plurality of concave curved surfaces deformed in a convex direction in the circumferential direction as viewed from the center of the sub-reflector are arranged in a convex shape. Avoid the sub-reflector and the stay by reflecting off the reflector and re-reflecting on the main reflector having a plurality of concave curved surfaces that are concavely deformed in the circumferential direction when viewed from the center of the main reflector. , So that it can be fired in the desired direction.

Further, according to the seventh aspect, the electromagnetic wave radiated from the radiator is a sub-reflector in which a plurality of convex curved surfaces deformed in a convex direction in a circumferential direction as viewed from the center of the sub-reflector are arranged in a convex shape. Avoid the sub-reflector and the stay part by reflecting off the reflector and re-reflecting on the main reflector having a plurality of concave curved surfaces deformed in the convex direction in the circumferential direction when viewed from the center of the main reflector. , So that it can be fired in the desired direction.

According to the eighth aspect, the electromagnetic wave radiated from the radiator is a sub-reflector in which a plurality of convex curved surfaces deformed in a convex direction in a circumferential direction when viewed from the center of the sub-reflector are arranged in a convex shape. Avoid the sub-reflector and the stay by reflecting off the reflector and re-reflecting on the main reflector having a plurality of concave curved surfaces that are concavely deformed in the circumferential direction when viewed from the center of the main reflector. , So that it can be fired in the desired direction.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 shows a first embodiment and is a diagram for explaining a reflector antenna constituted by using a main reflector, a sub-reflector and a radiator. 3 and 4 in FIG. 1 are exactly the same as the above-mentioned conventional reflector antenna. FIG.
FIG. 1 shows the reflector antenna according to the first embodiment of the present invention in FIG. 1 as viewed from the sub-reflector 2 to the main reflector 1. In FIG. 1, 1 is a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in the circumferential direction in a convex direction, and 2 is arranged in a concave shape by intersecting a plurality of concave curved surfaces deformed in the circumferential direction in a concave direction. It is a sub-reflector. The sub-reflection mirror 2 is arranged at the center of the main reflection mirror 1 and is located at a position distant from the main reflection mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 1, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflector 2, reflected again by the main reflector 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a concave curved surface, the electromagnetic wave 5 is narrowed when reflected by the sub-reflecting mirror 2 and travels toward the main reflecting mirror 1 while spreading again. At this time, since the sub-reflecting mirror 2 is arranged in a concave shape, the position where the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 is narrowed deviates from the center of the main reflecting mirror 1. The electromagnetic wave 5 narrowed at a position deviating from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflection mirror 2 is arranged in a concave shape, the electromagnetic wave 5
Deviates from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the sub-reflecting mirror 2. In FIG. 2, an electromagnetic wave 5 radially radiated from the radiator 4 is reflected by the sub-reflector 2, reflected again by the main reflector 1, and emitted in a target direction. Since the sub-reflector 2 has a plurality of curved surfaces deformed in the circumferential direction in the concave direction, the electromagnetic wave 5 is transmitted through the sub-reflector 2.
, The light is narrowed at a position deviated from the center of the main reflecting mirror 1, and spreads again toward the main reflecting mirror 1. The electromagnetic wave 5 narrowed at a position deviating from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in a circumferentially convex direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, the electromagnetic wave 5 is parallel and emitted in a target direction. The above stay
A plurality of curved surfaces 3 are provided in the direction in which the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions at which the curved surfaces of the main reflecting mirror 1 intersect. Since the electromagnetic wave 5 is narrowed at a position deviated from the center of the main reflecting mirror 1, the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay-3.

Embodiment 2 FIG. 3 shows Embodiment 2 and is a view for explaining a reflector antenna constituted by using a main reflector, a sub-reflector and a radiator. 3 and 4 in FIG. 3 are exactly the same as the above-mentioned conventional reflector antenna. FIG.
FIG. 1 shows a reflector antenna according to Embodiment 2 of the present invention in FIG. 1 as viewed from the sub-reflector 2 toward the main reflector 1. In FIG. 3, 1 is a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in the circumferential direction concavely, and 2 is arranged in a concave shape by intersecting a plurality of concave curved surfaces deformed in the circumferential direction concavely. It is a sub-reflector. The sub-reflection mirror 2 is arranged at the center of the main reflection mirror 1 and is located at a position distant from the main reflection mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 3, the electromagnetic wave 5 radially radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected again by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflection mirror 2 has a concave curved surface, the electromagnetic wave 5 is narrowed when reflected by the sub-reflection mirror 2 and then spreads again toward the main reflection mirror 5. At this time, since the sub-reflecting mirror 2 is arranged in a concave shape, the position where the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 is narrowed deviates from the center of the main reflecting mirror 1. The electromagnetic wave 5 narrowed at a position deviating from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflector 2 is arranged in a concave shape, the electromagnetic wave 5
Deviates from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the sub-reflecting mirror 2. In FIG. 4, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a plurality of curved surfaces deformed in the circumferential direction in the concave direction, the electromagnetic wave 5 is transmitted to the sub-reflecting mirror 2.
When the light is reflected by the light source, it spreads from an imaginary position deviated from the center of the main reflecting mirror 1 to the main reflecting mirror 5. The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading from a virtual position off the center of the main reflecting mirror 1. The main reflecting mirror 1
Has a plurality of curved surfaces that are concavely deformed in the circumferential direction,
When the electromagnetic wave 5 is reflected by the main reflecting mirror 1, it becomes parallel and is emitted in a target direction. The stay-3 is provided in the direction in which the curved surfaces of the sub-reflecting mirrors 2 intersect from the position where the curved surfaces of the main reflecting mirror 1 intersect, and the sub-reflecting mirror 2 is deformed in the concave direction in the circumferential direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 spreads from an imaginary position deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay-3.

Third Embodiment FIG. 5 shows a third embodiment and is a diagram for explaining a reflector antenna constituted by using a main reflector, a sub-reflector, and a radiator. 5 and 4 are exactly the same as the above-mentioned conventional reflector antenna. FIG.
FIG. 5 shows a reflector antenna according to Embodiment 3 of the present invention in FIG. 5 as viewed from the sub-reflector 2 to the main reflector 1. In FIG. 5, 1 is a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in the circumferential direction convexly, and 2 is arranged in a concave shape by intersecting a plurality of convex curved surfaces deformed in the circumferential direction concavely. It is a sub-reflector. The sub-reflection mirror 2 is arranged at the center of the main reflection mirror 1 and is located at a position distant from the main reflection mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 5, the electromagnetic wave 5 radially radiated from the radiator 4 is reflected by the sub-reflector 2, reflected again by the main reflector 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a convex curved surface, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it spreads from a virtual position to the main reflecting mirror 5. At this time, since the sub-reflecting mirror 2 is arranged in a concave shape, the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 spreads from a virtual position off the center of the main reflecting mirror 1. The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading from a virtual position. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflector 2 is arranged in a concave shape, the electromagnetic wave 5 spreads from an imaginary position deviated from the center of the main reflector 1, so that the electromagnetic wave 5 reflected by the main reflector 1 is It is not blocked by the sub-reflector 2. In FIG. 6, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1, and emitted in a target direction.
Since the sub-reflector 2 has a plurality of curved surfaces deformed in the concave direction in the circumferential direction, when the electromagnetic wave 5 is reflected by the sub-reflector 2, it is narrowed at a position off the center of the main reflector 1, It is directed toward the main reflecting mirror 1 while spreading again. The electromagnetic wave 5 narrowed at a position off the center of the main reflecting mirror 1
Is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in the circumferential direction in the convex direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, the electromagnetic wave 5 becomes parallel and is emitted in a target direction. The above step-3
Is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirrors 1 intersect, and a plurality of curved surfaces in which the sub-reflecting mirrors 2 are deformed in the concave direction in the circumferential direction. Therefore, the electromagnetic wave 5 is deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay-3.

Fourth Embodiment FIG. 7 shows a fourth embodiment and is a diagram for explaining a reflector antenna constituted by using a main reflecting mirror, a sub-reflecting mirror, and a radiator. 7 and 4 in FIG. 7 are exactly the same as the above-mentioned conventional reflector antenna. FIG.
FIG. 5 shows a reflector antenna according to Embodiment 4 of the present invention in FIG. 5 as viewed from the sub-reflector 2 to the main reflector 1. In FIG. 7, reference numeral 1 denotes a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in a concave direction in a circumferential direction, and 2 denotes a plurality of convex curved surfaces deformed in a concave direction in a circumferential direction intersecting and arranged in a concave shape. It is a sub-reflector. The sub-reflection mirror 2 is arranged at the center of the main reflection mirror 1 and is located at a position distant from the main reflection mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 5, the electromagnetic wave 5 radially radiated from the radiator 4 is reflected by the sub-reflector 2, reflected again by the main reflector 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a convex curved surface, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it spreads from a virtual position to the main reflecting mirror 5. At this time, since the sub-reflecting mirror 2 is arranged in a concave shape, the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 spreads from a virtual position off the center of the main reflecting mirror 1. The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading from a virtual position off the center of the main reflecting mirror 1. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflector 2 is arranged in a concave shape, the electromagnetic wave 5
The electromagnetic wave 5 reflected from the main reflecting mirror 1 is not blocked by the sub-reflecting mirror 2 because the light beam spreads from a virtual position off the center of the main reflecting mirror 1. In FIG. 8, the electromagnetic wave 5 radiated from the radiator 4 is
The light is reflected by the sub-reflection mirror 2 and again reflected by the main reflection mirror 1, and is emitted in a target direction. Since the sub-reflector 2 has a plurality of curved surfaces deformed in the concave direction in the circumferential direction, when the electromagnetic wave 5 is reflected by the sub-reflector 2, the
While spreading from a virtual position deviated from the center of the main reflection mirror 5. The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in a circumferentially concave direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, it becomes parallel and is emitted in a target direction. The stay-3 is provided in the direction in which the curved surfaces of the sub-reflecting mirrors 2 intersect from the position where the curved surfaces of the main reflecting mirror 1 intersect, and the sub-reflecting mirror 2 is deformed in the concave direction in the circumferential direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 spreads from an imaginary position deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay-3.

Fifth Embodiment FIG. 9 shows a fifth embodiment and is a view for explaining a reflector antenna constituted by using a main reflector, a sub-reflector and a radiator. 3 and 4 in FIG. 9 are exactly the same as the above-mentioned conventional reflector antenna. FIG.
0 shows the reflector antenna of Embodiment 1 of the present invention in FIG. 9 as viewed from the sub-reflector 2 in the direction of the main reflector 1. In FIG. 9, 1 is a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in the circumferential direction convexly, and 2 is a sub-reflection in which a plurality of concavely curved surfaces deformed in the circumferential direction convexly arranged in a convex shape. It is a mirror. The sub-reflection mirror 2 is arranged at the center of the main reflection mirror 1 and is located at a position distant from the main reflection mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The above step-3
Is provided in a direction in which the curved surfaces of the sub-reflecting mirror 2 intersect from the position where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 9, the electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflector 2 has a concave curved surface, the electromagnetic waves 5
When the light is reflected by the main reflecting mirror 5, it is narrowed and spread again.
Turn to. At this time, since the sub-reflecting mirror 2 is arranged in a convex shape, the position of the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 is deviated from the center of the main reflecting mirror 1. The electromagnetic wave 5 narrowed at a position deviating from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflector 2 is arranged in a convex shape, the electromagnetic wave 5 is narrowed at a position deviated from the center of the main reflector 1, and the electromagnetic wave 5 reflected by the main reflector 1 is It is not blocked by the sub-reflector 2. Also, in FIG. 10, the electromagnetic wave 5 radiated from the radiator 4 radially
And is again reflected by the main reflecting mirror 1 and emitted in a target direction. Since the sub-reflecting mirror 2 has a plurality of curved surfaces deformed in the circumferential direction in the convex direction, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it is narrowed at a position off the center of the main reflecting mirror 1, It spreads to the main reflecting mirror 5 again. The electromagnetic wave 5 narrowed at a position deviating from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in the circumferential direction in the convex direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, the electromagnetic wave 5 becomes parallel and is emitted in a target direction. The stay-3 is provided in a direction where the curved surface of the sub-reflecting mirror 2 intersects from a position where the curved surface of the main reflecting mirror 1 intersects, and the sub-reflecting mirror 2 is deformed in a circumferentially convex direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 is narrowed at a position deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay 3.

Sixth Embodiment FIG. 11 shows a sixth embodiment and is a view for explaining a reflector antenna constituted by using a main reflector, a sub-reflector, and a radiator. Reference numerals 3 and 4 in FIG. 11 are exactly the same as the above-mentioned conventional reflector antenna.
FIG. 12 is a view of FIG. 11 of the reflector antenna according to the second embodiment of the present invention when viewed from the sub-reflector 2 toward the main reflector 1. In FIG. 11, reference numeral 1 denotes a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in a concave direction in a circumferential direction;
Reference numeral 2 denotes a sub-reflecting mirror in which a plurality of concave curved surfaces deformed in a concave direction in the circumferential direction intersect and are arranged in a convex shape. Sub-reflection mirror 2
Is arranged at the center of the main reflecting mirror 1 and is located at a position distant from the main reflecting mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 11, the electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflection mirror 2 has a concave curved surface, the electromagnetic wave 5 is narrowed when reflected by the sub-reflection mirror 2 and then spreads again toward the main reflection mirror 5. At this time, since the sub-reflecting mirror 2 is arranged in a convex shape, the position of the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 is deviated from the center of the main reflecting mirror 1. The electromagnetic wave 5 whose narrowed position deviates from the center of the main reflecting mirror 1 is reflected by the main reflecting mirror 1 while spreading again. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Accordingly, since the sub-reflecting mirror 2 is arranged in a convex shape, the position where the electromagnetic wave 5 is narrowed is deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is It is not blocked by the sub-reflector 2. Also,
In FIG. 12, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflector 2, reflected again by the main reflector 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a plurality of curved surfaces deformed in a circumferentially convex direction, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it spreads from a virtual position off the center of the main reflecting mirror 1. However, it faces the main reflecting mirror 5. The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading from a virtual position off the center of the main reflecting mirror 1. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in a circumferentially concave direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, it becomes parallel and is emitted in a target direction. The stay-3 is provided in a direction where the curved surface of the sub-reflecting mirror 2 intersects from a position where the curved surface of the main reflecting mirror 1 intersects, and the sub-reflecting mirror 2 is deformed in a circumferentially convex direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 spreads from an imaginary position deviated from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay-3.

Embodiment 7 FIG. 13 shows Embodiment 7 and is a view for explaining a reflector antenna constituted by using a main reflector, a sub-reflector and a radiator. 13 and 4 in FIG. 13 are exactly the same as the above-mentioned conventional reflector antenna.
FIG. 14 is a view of FIG. 13 of the reflector antenna according to the seventh embodiment of the present invention as viewed from the sub-reflector 2 toward the main reflector 1. In FIG. 13, reference numeral 1 denotes a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in a convex direction in a circumferential direction;
Reference numeral 2 denotes a sub-reflection mirror in which a plurality of convexly curved surfaces deformed in the circumferentially convex direction intersect and are arranged in a convex shape. Sub-reflection mirror 2
Is arranged at the center of the main reflecting mirror 1 and is located at a position distant from the main reflecting mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 13, the electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected again by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflector 2 has a convex curved surface, when the electromagnetic wave 5 is reflected by the sub-reflector 2, it spreads toward the main reflector 5. At this time, since the sub-reflecting mirror 2 is arranged in a convex shape, the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 deviates from the center of the main reflecting mirror 1. Sub-reflection mirror 2
The electromagnetic wave 5 reflected from the main reflecting mirror 1 is deflected from the center of the main reflecting mirror 1, and the electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading. Since the main reflecting mirror 1 has a convex curved surface, the electromagnetic waves 5 are parallel and emitted in a target direction. Therefore, since the sub-reflector 2 is arranged in a convex shape, the electromagnetic wave 5
Deviates from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the sub-reflecting mirror 2. In FIG. 14, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1 again, and emitted in a target direction. Since the sub-reflecting mirror 2 has a plurality of curved surfaces deformed in a circumferentially convex direction, the electromagnetic wave 5 is narrowed when reflected by the sub-reflecting mirror 2 and spreads again toward the main reflecting mirror 5. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in the circumferential direction in the convex direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, the electromagnetic wave 5 becomes parallel and is emitted in a target direction. The stay-3 is provided in a direction where the curved surface of the sub-reflecting mirror 2 intersects from a position where the curved surface of the main reflecting mirror 1 intersects, and the sub-reflecting mirror 2 is deformed in a circumferentially convex direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 deviates from the center of the main reflecting mirror 1, so that the electromagnetic wave 5 reflected by the main reflecting mirror 1 is not blocked by the stay 3.

Embodiment 8 FIG. 15 shows Embodiment 8 and is a view for explaining a reflector antenna constituted by using a main reflector, a sub-reflector and a radiator. 3 and 4 in FIG. 15 are exactly the same as the above-mentioned conventional reflector antenna.
FIG. 16 is a view of FIG. 15 of the reflector antenna according to the eighth embodiment of the present invention as viewed from the sub-reflector 2 in the direction of the main reflector 1. In FIG. 15, reference numeral 1 denotes a main reflecting mirror having a plurality of intersecting concave curved surfaces deformed in a concave direction in a circumferential direction;
Reference numeral 2 denotes a sub-reflection mirror in which a plurality of convexly curved surfaces deformed in the circumferentially convex direction intersect and are arranged in a convex shape. Sub-reflection mirror 2
Is arranged at the center of the main reflecting mirror 1 and is located at a position distant from the main reflecting mirror 1. The position where the curved surfaces of the main reflecting mirror 1 intersect and the position where the curved surfaces of the sub-reflecting mirror 2 intersect are arranged in the same direction as viewed from the center of the main reflecting mirror 2. The stay-3 is provided in a direction where the curved surfaces of the sub-reflecting mirrors 2 intersect from the positions where the curved surfaces of the main reflecting mirror 1 intersect. As shown in FIG. 15, the electromagnetic wave 5 radially radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected again by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a convex curved surface, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it spreads from a virtual position to the main reflecting mirror 5. At this time, since the sub-reflecting mirror 2 is arranged in a convex shape, the electromagnetic wave 5 reflected by the sub-reflecting mirror 2 deviates from the center of the main reflecting mirror 1.
The electromagnetic wave 5 is reflected by the main reflecting mirror 1 while spreading from a position off the center of the main reflecting mirror 1. Since the main reflecting mirror 1 has a concave curved surface, the electromagnetic waves 5 become parallel,
Fired in the desired direction. Therefore, since the sub-reflector 2 is arranged in a convex shape, the electromagnetic wave 5 is transmitted to the main reflector 1.
, The electromagnetic wave 5 reflected from the main reflecting mirror 1 is not blocked by the sub-reflecting mirror 2. In FIG. 16, an electromagnetic wave 5 radiated from the radiator 4 is reflected by the sub-reflecting mirror 2, reflected by the main reflecting mirror 1, and emitted in a target direction. Since the sub-reflecting mirror 2 has a plurality of curved surfaces deformed in a circumferentially convex direction, when the electromagnetic wave 5 is reflected by the sub-reflecting mirror 2, it spreads at a position deviated from the center position of the main reflecting mirror 1. However, it faces the main reflecting mirror 5. The electromagnetic wave 5 is
The light is reflected by the main reflecting mirror 1 while spreading from a position deviating from the center position of the main reflecting mirror 1. Since the main reflecting mirror 1 has a plurality of curved surfaces deformed in a circumferentially concave direction, when the electromagnetic wave 5 is reflected by the main reflecting mirror 1, it becomes parallel and is emitted in a target direction. The stay-3 is provided in a direction where the curved surface of the sub-reflecting mirror 2 intersects from a position where the curved surface of the main reflecting mirror 1 intersects, and the sub-reflecting mirror 2 is deformed in a circumferentially convex direction. Since the electromagnetic wave 5 has a plurality of curved surfaces, the electromagnetic wave 5 spreads from a position deviated from the center position of the main reflecting mirror 1.
Is not blocked by the stay-3.

[0021]

According to the present invention, the electromagnetic wave radiated from the radiator is constructed as described above.
Since it is not interrupted or disturbed by the sub-reflector and the stay, transmission and reception with higher quality can be performed as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining a flow of an electromagnetic wave using a reflector antenna according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the second embodiment of the present invention;

FIG. 4 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the second embodiment of the present invention;

FIG. 5 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the third embodiment of the present invention.

FIG. 6 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the third embodiment of the present invention.

FIG. 7 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the fourth embodiment of the present invention.

FIG. 8 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the fourth embodiment of the present invention.

FIG. 9 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the fifth embodiment of the present invention.

FIG. 10 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the fifth embodiment of the present invention.

FIG. 11 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the sixth embodiment of the present invention.

FIG. 12 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the sixth embodiment of the present invention.

FIG. 13 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the seventh embodiment of the present invention.

FIG. 14 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the seventh embodiment of the present invention.

FIG. 15 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the eighth embodiment of the present invention.

FIG. 16 is a diagram for explaining a flow of an electromagnetic wave using the reflector antenna according to the eighth embodiment of the present invention.

FIG. 17 is a diagram for explaining the flow of an electromagnetic wave using a conventional reflector antenna.

FIG. 18 is a diagram for explaining a flow of an electromagnetic wave using a conventional reflector antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main reflecting mirror 2 Sub-reflecting mirror 3 Stay 4 Radiator 5 Electromagnetic wave

Claims (8)

[Claims] 1. A main reflector having a curved surface, a radiator provided on the main reflector, a sub-reflector provided opposite to the radiator, and a stay for supporting the sub-reflector. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of concave curved surfaces deformed in the concave direction in the circumferential direction are arranged in a concave shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the center of the main reflecting mirror. The reflector antenna is arranged in the same direction as viewed from above, and the longitudinal direction of the stay is provided in a direction in which the curved surface of the sub-reflector intersects from the position where the curved surface of the main reflector intersects. 2. A main reflector having a curved surface, a radiator provided on the main reflector, a sub-reflector provided opposite to the radiator, and a stay for supporting the sub-reflector. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of concave curved surfaces deformed in the concave direction in the circumferential direction are arranged in a concave shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the center of the main reflecting mirror. The reflector antenna is arranged in the same direction as viewed from above, and the longitudinal direction of the stay is provided in a direction in which the curved surface of the sub-reflector intersects from the position where the curved surface of the main reflector intersects. 3. A main reflecting mirror having a curved surface, a radiator provided on the main reflecting mirror, a sub-reflecting mirror provided opposite to the radiator, and a stay for supporting the sub-reflecting mirror. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. The plurality of convex curved surfaces deformed in the concave direction in the circumferential direction are arranged in a concave shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the center of the main reflecting mirror. The reflector antenna is arranged in the same direction as viewed from above, and the longitudinal direction of the stay is provided in a direction in which the curved surface of the sub-reflector intersects from the position where the curved surface of the main reflector intersects. 4. A main reflecting mirror having a curved surface, a radiator provided on the main reflecting mirror, a sub-reflecting mirror provided opposite to the radiator, and a stay for supporting the sub-reflecting mirror. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. The plurality of convex curved surfaces deformed in the concave direction in the circumferential direction are arranged in a concave shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the center of the main reflecting mirror. The reflector antenna is arranged in the same direction as viewed from above, and the longitudinal direction of the stay is provided in a direction in which the curved surface of the sub-reflector intersects from the position where the curved surface of the main reflector intersects. 5. A main reflector having a curved surface, a radiator provided on the main reflector, a sub-reflector provided facing the radiator, and a stay for supporting the sub-reflector. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of concave curved surfaces deformed in the convex direction in the circumferential direction are arranged in a convex shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the positions of the main reflecting mirror. A reflector arranged in the same direction as viewed from the center, wherein a longitudinal direction of the stay is provided in a direction in which a curved surface of the sub-reflector intersects from a position at which a curved surface of the main reflector intersects; . 6. A main reflecting mirror having a curved surface, a radiator provided on the main reflecting mirror, a sub-reflecting mirror provided facing the radiator, and a stay for supporting the sub-reflecting mirror. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of concave curved surfaces deformed in the convex direction in the circumferential direction are arranged in a convex shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the positions of the main reflecting mirror. A reflector arranged in the same direction as viewed from the center, wherein a longitudinal direction of the stay is provided in a direction in which a curved surface of the sub-reflector intersects from a position at which a curved surface of the main reflector intersects; . 7. A main reflector having a curved surface, a radiator provided on the main reflector, a sub-reflector provided opposite to the radiator, and a stay for supporting the sub-reflector. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of convex curved surfaces deformed in the convex direction in the circumferential direction are arranged in a convex shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the positions of the main reflecting mirror. A reflector arranged in the same direction as viewed from the center, wherein a longitudinal direction of the stay is provided in a direction in which a curved surface of the sub-reflector intersects from a position at which a curved surface of the main reflector intersects; . 8. A main reflector having a curved surface, a radiator provided on the main reflector, a sub-reflector provided opposite to the radiator, and a stay for supporting the sub-reflector. In the reflector antenna described above, the main reflecting mirror has a plurality of concave curved surfaces deformed in a circumferential direction when viewed from the center of the main reflecting mirror, and the sub-reflecting mirror is viewed from the center of the sub-reflecting mirror. A plurality of convex curved surfaces deformed in the convex direction in the circumferential direction are arranged in a convex shape, and the position where the curved surface of the main reflecting mirror intersects and the position where the curved surface of the sub-reflecting mirror intersects are the positions of the main reflecting mirror. A reflector arranged in the same direction as viewed from the center, wherein a longitudinal direction of the stay is provided in a direction in which a curved surface of the sub-reflector intersects from a position at which a curved surface of the main reflector intersects; .