Ultra-large-aperture planar reflection array antenna

Abstract

The invention provides an ultra-large-aperture planar reflection array antenna, which can realize flexible beam scanning, is easy to process and is low in cost. A planar reflection array plane is adopted to replace a parabolic curved surface reflection plane, and the ultra-large-aperture planar reflection array antenna has the advantages of being flexible in beam scanning, easy to process, low incost and the like. According to the invention, a plurality of active sub-reflecting surfaces are combined, and mechanical phase control is realized by utilizing the mechanical motion of the sub-reflecting surfaces, i.e., the direction of a reflected wave beam is controlled by utilizing the mechanical motion of each sub-reflecting surface; directional control of reflection wave beams of the main reflection surface is realized through three-degree-of-freedom mechanical movement of pitching rotation, azimuth rotation and front-back movement of each sub-reflecting surface, and then the reflectionwave beams are synthesized in the same phase, so that large-angle scanning is realized. Due to the adoption of mechanical phase control, an electronic phase control assembly of a microstrip planar reflector antenna is not needed any more when the direction of a reflected wave beam is controlled, a grating lobe effect is avoided, the array element distance is not limited any more, and the cost forconstructing a reflecting array surface with an ultra-large aperture is reduced.

Description

technical field [0001] The invention belongs to the technical field of radar astronomy, and in particular relates to a super-large aperture planar reflection array antenna. Background technique [0002] Radar astronomy is a discipline that uses radar to actively transmit electromagnetic waves to celestial bodies in the universe, receive the echoes reflected by celestial bodies, and analyze and process the echo signals to study the physical properties and geometric structures of celestial bodies. [0003] With the continuous deepening of the exploration of the universe, the requirements for the gain of the antenna system are getting higher and higher. In order to increase the gain of the antenna, it is necessary to increase the effective receiving area of ​​the antenna, and the large-aperture reflector antenna is one of the effective ways to increase the effective receiving area of ​​the antenna. In order to meet the application requirements of astronomical observation and d...

AI Technical Summary

Problems solved by technology

In order to avoid the grating lobe effect, the array element spacing must be less than half the wavelength. Therefore, for a reflective surface with a large aperture, a large number of microstrip array elements and corresponding electronic phase control components are required, and the construction cost is high and difficult.

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