System study and technical development on the Solar Power Satellite with concentrators and transmitters in the sandwich structure

太阳能卫星(SPS)是唯一有希望在不破坏地球母亲环境的情况下满足地面日益增长的能源需求的发电站之一。然而，必须在SPS上研究新的突破，因为美国能源部/NASA设计的参考系统太大，实现起来也太昂贵。我们已经提出了SPS的新概念，它由一个三明治结构的发电机/发射机和大型收集器组成。为了实现我们的SPS新概念，我们正在开发一种新型的高功率微波发射机，该发射机在夹层结构中具有回向天线。新的微波发射机已成功地改进如下：1)更高的频率可以使发射机更小。微波的频率为4.8 GHz，使发射机的直径减半。2)采用微波的半频(2.4 GHz)作为反向天线的导频信号，使得射频电路非常简单和精确。4)发射天线直接连接到放大器，以减少电缆的损耗和天线的重量。我们成功地利用反向天线进行了微波功率传输演示，以实现精确的波束控制。

The Solar Power Satellite (SPS) is one of the unique and hopeful electric power stations to satisfy ever-increasing energy demand on the ground without destroying the environment of our mother planet Earth. However, new breakthroughs must be investigated on the SPS, because the reference system designed by DOE/NASA is too huge and too expensive for the realization. We have already proposed a new concept of the SPS, which consists of a generator/transmitter of a sandwich structure and large collectors. We are developing a new high power microwave transmitter with a retrodirective antenna in the sandwich structure in order to realize our new concept of the SPS. The new microwave transmitter has successfully been improved as follows :1)Higher frequency can make the transmitter smaller. The frequency of the microwave is 4.8 GHz to make the diameter of the transmitter half.2)Half frequency (2.4 GHz) of the microwaves is used as a pilot signal of the retrodirective antenna to make RF circuit very simple and accurate.4)The transmitting antenna is directly connected to the amplifiers to reduce the loss of cables and the weight of the antenna.We successfully carried out a Microwave Power Transmission demonstration using the retrodirective antenna for the accurate beam control.