The Study Of Space Ultra-Large Planar Deployable Antenna

The utilization of solar power through developing of space solar power station(SSPS)is regarded as an important way to solve the energy problem.The SSPS collects solar power in space and converts it into electricity,which is transmitted to the ground as microwaves through a microwace transmitting antenna.As an indispensable part of SSPS,however,microwave transmitting antenna(MTA)is very hard to develop.In this study,the designs of a cable-membrane microstrip phase array antenna with light weight and a new type of ultra-large plannar deployale structure forming like Chinese character '?' were.proposed to solve the developing problem of MTA.The main results were as follows:(1)To meet the requirements of the reflector of MTA,a cable-membrane microstrip phase array antenna with light weight was proposed.We explained the design principle of utilizing cable-membrane to achieve light weight and low thermal deformation,based on using negative thermal expansion coefficient of Kevlar.And the slit design of continuous flat copper foil to reduce thermal stress and deformation.Besides,the design basis of each parameter and advantages of this antenna were introduced.After the thermal deformation analysis,and the optimization design of the main structural parameters with the commercial finite element software,the optimal antenna structure parameter was obtained and electrical performance of the antenna were carried out as well.Our research demonstrated that this antenna could meet the configuration of antenna,which could serve as the reflector of MTA.(2)In order to meet the demand of the supporting and deployable function of MTA,a new type of '?' shape plannar deployable structure and a new type of?driving/locking mechanism were proposed.The operating principles and detailed design of them were introduced elaborately.Meanwhile,a prototype sample was created to verify the feasibility of design.In addition,there was an option between deployable or undeployable scheme along the thickness direction.The folding ratios in horizontal,vertival,thickness directions were discussed.In the end,a large deployable array was designed.The reaearch results showed that this structure had the merits of large folding ratio,and could be used as a support structure to meet the requirements of microwave transmitting antenna.The structure was divided into multiple arrays,and each single array was deployable.(3)The dynamic simulations analysis of '?' shape module and new type of drving/locking mechanism were carried out by commercial dynamic software.The factors such as the deployable time and dynamic impact were ecaluated.The research results showed that the drving/locking mechanism had less impact and could be successfully deployed when one side mechanism failed.The '?' shape module could realize rapid deployment and gradual locking.