| 摘要 |
PROBLEM TO BE SOLVED: To realize a small and inexpensive system in a phased array antenna employing optical control. SOLUTION: The phased array antenna comprises a multimode FP-LD 500 generating an optical pulse by gain switching, a high dispersion optical fiber 520 for passing the optical pulse thus generated and separating each mode to generate a microwave signal, an optical distributor 530 for distributing the mode separated optical pulse train depending on the number of antenna arrays, time lag lines 550a,... for passing each distributed optical pulse through a nondispersion optical fiber 540 of different length to generate a phase difference by a different time lag, photodetectors 560a,... for photoelectrically converting each optical pulse having a phase difference, optical amplifiers 570a,... for amplifying each optical pulse subjected to photoelectric conversion, and antenna arrays 580a,... for transmitting each amplified optical pulse.
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