Optimisation Of An Integrated Planar Magnetic For Active Antenna Panels

The envisaged German Space Missions HRWS and TerraSAR-X follow-on have triggered the development of a new generation of low voltage DC power supplies for active antennas at Astrium GmbH. The basic approachis tointegrate all power, digital, RF electronics and RF radiators required for one antenna tile into one common unit. Due to the high number of electronic boxes needed for one antenna it is essential to optimise cost, volume, efficiency and weight. The development of an integrated planar magnetic for power conversion is one contribution to this overall optimisation process. The focus of this presentation is the development of an integrated planar magnetic used for a half-bridge forward converter with secondary side synchronous current doubler. The converter is supplied from a 100 V power bus and delivers a total average output power of 280W for the drain supply of the pulsed RF power stages.