吉 宇
光信号処理によるマルチビームアレーアンテナ
Abstract:Recently the application of optical or photonics technology to microwave array antenna in the signal processing and beam formation has been studied. Based on the two-laser model of spatial Fourier optical processing techniques, by placing numbers of optical fibers in the incident focal plane of Fourier transform (focusing) lens, a multibeam optical processing system for microwave transmitting array antennas is proposed in this technical report.
Chapter 1 gives the background of a spatial optical processing antenna and a mathematical description of the antenna characteristics. Chapter 2 presents the structure of optical processor for multibeam array antennas, the general system design and analysis method, and some numerical results, such as optical excitation distribution and antenna radiation patterns. Two-beam experimental optical processor for producing RF signals with different phase distributions and feeding to array antennas is demonstrated in this Chapter as well. By using optical heterodyne process, Chapter 3 describes a parallel optical processor for multibeam antennas, which can greatly reduce the optical alignment difficulties, the free-space beam transmission loss, and the size of the optical processing feed part. To increase the spatial optical sampling efficiency, Chapter 4 proposes a method to produce the bright spots in the image or sampling plane by employing a periodic diffracting mesh. Chapter 5 gives a summary of this technical report.