43 results about "Umbrella antenna" patented technology

A new type of high-precision umbrella-shaped antenna rib expansion mechanism, the motor and reducer provide power for the rib expansion mechanism; the screw is connected to the reducer through the coupling block, and rotates itself under the drive of the reducer, and the nut is set on the screw. The rotating motion of the lead screw is converted into the up and down linear motion of the nut; the sliding plate is set on the guide sleeve, connected with the nut through a limit screw, and moves up and down together with the nut; one end of the connecting rod is hinged to the sliding plate through a rotating shaft, and the other end It is hinged with the locking arm; the umbrella-shaped antenna rib is installed on the H surface of the locking arm, and the locking arm is driven by the connecting rod to rotate, and then drives the antenna rib to complete the unfolding or retracting action; the locking device in place is used for the antenna rib to be unfolded in place. Locking, so that the antenna rib has sufficient rigidity; the invention realizes the smooth deployment and retraction of the high-precision umbrella antenna and the process is controllable, and has the characteristics of high repeated deployment accuracy and small thermal deformation.

The invention discloses an umbrella-shaped antenna deployment mechanism combined with a fixed-axis gear train and a lead screw, comprising an antenna storage cylinder, a fixed-axis gear train, a lead screw, a central hub, antenna ribs, a wire mesh reflective surface, a feed source horn, The auxiliary reflector and the spring are characterized in that: the antenna storage tube is a fixed member, which is used to envelop the retracted state of the entire umbrella antenna; the fixed-axis wheel train is installed at the bottom of the storage tube, and each gear can Rotate around its own axis; the lower end of the lead screw is fixedly connected with the coaxial center of the gear corresponding to the fixed-axis gear train, and is integrated with the gear; the central wheel hub and the lead screw are connected through transmission threads, and the lead screw The rotation drives the rise of the central hub. The invention has the advantages of small folded volume and high unfolded precision, and can be used in the design of small and high-precision umbrella antennas.

The invention discloses an electromechanical integration optimization design method for an umbrella-shaped antenna under an optimal focal distance. The method comprises the steps of inputting a geometrical parameter, a material parameter and an electrical parameter of the umbrella-shaped antenna; calculating the optimal focal distance of the umbrella-shaped antenna; calculating an ideal antenna far electric field under the optimal focal distance; calculating the number of segments of antenna ribs; calculating coordinates of points on the ribs; calculating the coordinates of the points between the adjacent ribs; generating all node coordinates of the umbrella-shaped antenna; establishing a structure finite element model of the umbrella-shaped antenna under the optimal focal distance; generating first-order and second-order coefficient matrixes of total electrical property under the optimal focal distance; solving the structure finite element model under the optimal focal distance; approximately calculating a variation of the far electric field of the umbrella-shaped antenna under the optimal focal distance; calculating the far electric field of the umbrella-shaped antenna under the optimal focal distance; judging whether the electrical property meets the requirement; outputting an antenna structure design scheme; and updating the antenna parameters. According to the method, surface patch splicing characteristics of the umbrella-shaped antenna are considered, the electrical property under the optimal focal distance is acquired based on a second-order approximate calculation formula, and the electromechanical integration optimization design efficiency can be improved.

The invention discloses a mounting method of a metal mesh surface of an umbrella antenna and relates to the technical field of an antenna mechanism. The method comprises the following steps: (1) sequentially adjusting sectors between umbrella antenna ribs through a sewing device; (2), cutting a metal mesh; (3), levelling and laying the metal mesh on the surface of the sewing device, applying a pre-tightening force and fixing the metal mesh; (4), laying an L-shaped dielectric isolation belt; (5), placing and fixing the sewing device in one sector; (6), sewing the metal mesh and the dielectric isolation belt into two umbrella antenna ribs through a sewing thread; (7), repeating steps (3) to (6), and sequentially sewing n-1 sectors; and (8), adjusting the last sector, and repeating the step (3) to (6) to sew the last sector. The mounting method provided by the invention realizes the good electric performance requirement of the umbrella deployable antenna and ensures higher mesh surface accuracy and better tension uniformity.

The invention discloses an umbrella-shaped antenna structure parameter optimization design method based on optimal consistence parameters. The method specifically comprises the following steps: inputting structure parameters and electronic parameters of an umbrella-shaped antenna; calculating segment numbers of antenna ribs; calculating coordinates of points on the ribs; calculating coordinates of points of adjacent ribs; generating all node coordinates of the umbrella-shaped antenna; calculating a node optical path difference direct-ratio vector; calculating a node consistence geometric matrix; calculating a weighting matrix; calculating an optimal consistence parameter column vector; outputting axial precision of the umbrella-shaped antenna; judging whether the axial precision meets requirements or not; outputting the structure parameters of the umbrella-shaped antenna; and updating the structure parameters of the umbrella-shaped antenna. By adopting the umbrella-shaped antenna structure parameter optimization design method, the characteristic that the umbrella-shaped antenna is assembled through surface-piece splicing manner is taken into account, the axial precision of the umbrella-shaped antenna is analyzed based on the concept of an optima consistence paraboloid, the electronic parameters of the antenna are introduced into calculation of the axial precision, and thus the axial precision of the umbrella-shaped antenna is obtained through the optimal consistence parameters; and by adopting the method, mechanical structure design and mechanical-electric integration optimization design of umbrella-shaped antennas can be instructed.

The present invention discloses a patch integration formula-based umbrella antenna structure optimization design method. The method comprises the following specific steps: inputting the structure parameters and the electrical parameters of an umbrella antenna; calculating the optimal focal length of the umbrella antenna; calculating the segment number of antenna ribs; calculating the coordinates of points on the ribs; calculating the coordinates of points between adjacent ribs; generating all the node coordinates of the umbrella antenna; calculating the coefficient of a patch plane equation; calculating the coefficient of a triangle edge equation; calculating the projection area of the triangle; calculating the axial error of triangle patches; outputting the axial precision of the umbrella antenna; judging whether the axial precision of the umbrella antenna meets the requirement or not; outputting the structure parameters of the umbrella antenna; and updating the structure parameters of the umbrella antenna. According to the technical scheme of the invention, the characteristics of the umbrella antenna spliced by patches are considered. Based on the patch integration formula, the axial precision of the umbrella antenna is analyzed. Therefore, by adopting the method, the mechanical structure design and the electromechanical integrated optimization design of the umbrella antenna are guided.

A foldable expandable umbrella-shaped antenna structure skeleton and its unfolding method, the structure skeleton consists of a base, a primary rod, a rotating shaft, a secondary rod, a torsion spring, a retaining piece, a spring, a drawstring, a connecting rod, a nut, and a lead screw Composition; the circumference of the base is connected to the bottom end of the first-stage rod through a rotating shaft; the top end of the first-stage rod is connected to the bottom end of the second-stage rod through a torsion spring hinge; the clamping part-spring-drawing rope-rotating shaft constitutes a clamping structure, and the second-stage rod is folded The curved top is clamped in the clamping structure; the lower part of the primary rod is connected with the nut in the circumferential direction through the connecting rod, and the nut is installed on the lead screw to form a lead screw nut structure; the lead screw drives the nut to move upward, and the structural skeleton is retracted; the lead screw drives the nut to Move down, the structural skeleton is opened, the rotating shaft rotates through a certain angle, pull the pull cord to open the clamping structure to release the constraint, and the torsion spring drives the secondary rod to open; in this way, the structural skeleton is unfolded; the umbrella-shaped antenna structural skeleton of the present invention has a small folded size , large size, repeated retractable, light structure, high reliability.

The invention provides an unfolding mechanism applied to an umbrella-shaped antenna reflector. The antenna reflector comprises a base and unfolding ribs. The unfolding ribs are connected with the outer side edge of the base through hinges. The unfolding mechanism comprises motors and power cables connected with the motors, the motors are located below the roots of the unfolding ribs and fixedly connected to the outer side edge of the base, the unfolding ribs are connected with the outer side edge of the base through the power cables, and when the power cables are tightened by driving the motors, the unfolding ribs rotate around the connecting position of the hinges through the power cables, and therefore the unfolding ribs can be unfolded. The unfolding mechanism has the advantages of being small in size, light in weight, low in cost and good in unfolded effect. The invention further provides the umbrella-shaped antenna reflector with the unfolding mechanism.