Recent development in reconfigurable reflectors

A new concept in shaped reflector technology in which the antenna pattern can be reconfigured under motor control is described. In a spacecraft application it will be possible to prescribe coverage, synthesize the corresponding rigid reflector surface, determine the control string lengths to ensure the best fit, aid drive through telemetry, the control motors to achieve the desired pattern. However, considerable work must be done before a flight model can be built, and many fundamental problems of both an electrical and mechanical nature remain to be solved. Measured H-plane radiation patterns obtained using the compact antenna range are given. The pattern with the antenna configured as a paraboloid is shown, together with the pattern with the antenna configured as an elliptically shaped beam. There is excellent agreement with theoretical predictions. Examples of patterns achievable with this reflector system are given.<>