Inflatable Structure for a Three-Meter Reflectarray Antenna

The application of inflatable/rigidizable structures technology has become feasible for near-term large space antennas. The development of one of such application of a 3-m Ka-band reflectarray antenna is discussed. This antenna employs the beam scanning and circular polarization technology that allows the use of a flat surface instead of a parabolic antenna surface. Structurally, a flat surface is comparatively easier to fabricate, package, and maintain than a curved parabolic surface. The development of this antenna was also supported by an innovative inflatable/self-rigidizable boom technology, namely spring tape reinforced aluminum laminate boom. A spring tape reinforced aluminum laminate boom automatically rigidizes after it is deployed by inflation pressure. The rigidization of this boom requires no space power, curing agent, or other added-on rigidization devices. Small damage caused by micrometeoroid impacts will not affect structural performance of the boom, and inflation air is no longer needed after the boom is deployed. Detailed mechanical design, dynamic analysis, and deployment demonstration of the antenna are discussed.