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In this paper, we give a brief description of the evolution of the optics of FAST telescope. Several milestones that lead to the current FAST concept are presented. These include the lightweight focus suspension, active main reflector, backward illumination and new feed technology such as Phase Array Feed, etc. A perspective for future development is given in the end.
In this paper, a compact-sized, CP antenna for a 433.92-MHz handheld RFID reader application is presented. The basic design of the proposed antenna is a twoelement, miniaturized Yagi antenna composed of a driver and a director. Yagi antenna, one of well known directive antennas, has the advantage of increasing the gain of the handheld RFID reader antenna. The radiation pattern is directional toward...
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