Expandable umbrella-shaped antenna back frame based on bricard mechanism

Abstract

The invention relates to the technical field of antennas and particularly relates to an expandable umbrella-shaped antenna back frame based on a bricard mechanism, which is characterized by at least comprising a damping gas spring, a fixed connecting rod joint, a movable connecting rod joint, an umbrella-shaped back frame upper connecting rod, an umbrella-shaped back frame lower connecting rod, afirst bricard mechanism connecting rod, a second bricard mechanism connecting rod, a bricard mechanism positioning bracket, a bricard mechanism positioning joint and a transition joint, wherein the extending end of the damping gas spring is in threaded connection with the central threaded hole of the movable connecting rod joint; movable connecting rod joint hinges are distributed on the outer ring of the movable connecting rod joint; and each movable connecting rod joint hinge is hinged to one end of the umbrella-shaped back frame lower connecting rod. The problems of insufficient rigidity and precision of a radial rib expandable antenna are solved, and good synchronism during expanding and storing is ensured.

Description

technical field [0001] The invention relates to the technical field of antennas, in particular to an expandable umbrella-shaped antenna back frame based on a bricard mechanism. Background technique [0002] With the deepening of space exploration and the development of aerospace industry, spaceborne antennas are taking on more tasks. Due to the small size of the rocket's fairing, the launch cost is high, which requires lighter weight and smaller antennas to solve this problem. Since the antenna on orbit is too far away from the ground, the signal can only be received by the satellite after long-distance attenuation, which requires the antenna to have higher gain. At the same time, in order to improve other performance indicators, the aperture of the antenna on orbit is inevitably increase. The deployable antenna has the characteristics of light weight and small volume after shrinking, which can meet the current assumptions about large-aperture antennas on orbit. Therefore,...

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Problems solved by technology

[0004] Aiming at the above-mentioned problems of the radial rib antenna, the purpose of the present invention is to provide an expandable umbrella-shaped antenna back frame based on a bricard mechanism, so as to improve the rigidity and insufficient precision of the radial rib expandable antenna, and at the same time ensure the good synchronization

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