Millimeter wave near-field mechanical focusing double-reflecting-surface antenna

Abstract

The invention discloses a millimeter wave near-field mechanical focusing double-reflecting-surface antenna. The millimeter wave near-field mechanical focusing double-reflecting-surface antenna comprises a primary reflecting surface, a secondary reflecting surface and a feed source. Wave beams emitted by the feed source are reflected to the primary reflecting surface via the secondary reflecting surface and then emitted out. The secondary reflecting surface can move forward and backward, upward and downward and leftward and rightward or move rotatably or rotate on a movement mechanism. The shape of the curved surface of the primary reflecting surface is a rotary paraboloid. The central point of the primary reflecting surface is arranged at the intersection of the emergent central axis of the secondary surface and the axis of the radiation wave beams. The millimeter wave near-field mechanical focusing double-reflecting-surface antenna is simple in structure and mature in processing so that axis power density and operating distance range of the near-field region of the antenna are enhanced. Meanwhile, the position of the maximum power density can be simply and rapidly adjusted in a larger region, i.e. the maximum axis power density is greatly enhanced and the position can be adjusted in a large region under the situation of the same input power so that the range reaching the effective power threshold is enlarged.

Description

technical field [0001] The invention relates to the technical field of millimeter-wave antennas, in particular to a millimeter-wave double-reflection-surface shaped antenna whose radiation beams can be focused in a near-field area. Background technique [0002] The dual-reflector antenna consists of three parts: the main reflector, the sub-reflector and the feed, including Cassegrain, Gregory and ring-focus antennas. Compared with other antennas, it has the characteristics of low sidelobe, low cross polarization, and high gain. It has been widely used in precision tracking and measurement radars in missile ranges since the 1960s. Such as the AN / FPQ-6 radar and Qudex radar in the United States, and the JLA-1 in France. At the same time, compared with the centimeter wave band, the feeder system working in the millimeter wave frequency band has a large loss. In order to shorten the feeder line of the feed source, a general high-power millimeter wave system uses a double reflec...

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Problems solved by technology

However, the high-power millimeter-wave antennas that have been developed abroad all adopt the non-focused radiation mode with the focus at infinity, which makes the maximum axial power density (that is, the last Fresnel peak) of the mouth-surface radiation field in the near-field area relatively low. The distance range to reach the effective power threshold is small

[0004] The document with the application number (2014102572537) discloses a near-field beam-focusing millimeter-wave double-reflector antenna, which improves the power density on the near-field axis and increases the range of near-field action distance, but in practical applications, When the application environment parameters change and the position of the maximum power density point needs to be adjusted or the distance range to reach the effective power threshold needs to be wider, it is necessary to move the system as a whole, or replace a new antenna system or add another antenna system, which greatly increases the System cost and implementation difficulty, such as in the process of biomedicine and plasma heating, it is necessary to move or rotate the position of the maximum power density of the millimeter wave heated according to the actual physiological characteristics and the test distribution of plasma temperature to achieve the best effect. However, the original fixed-focus focusing method needs to increase the antenna system or use a very complicated mechanical structure to realize the overall movement of the whole system, which is extremely costly and technically difficult.

At present, in millimeter-wave near-field antennas, non-focusing antennas are used, and the position of the maximum power density is difficult to adjust. Therefore, a millimeter-wave focusing antenna system that can easily adjust the position of the focus point is needed.

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