Optical true time-delay feeder for phased array antennas using fiber Bragg gratings and metal-film reflectors

초록

A novel optical true time-delay (TTD) feeder for phased-array antennas incorporating a fiber Bragg grating (FBG) prism and optical fibers with metal film deposited on their cleaved ends is proposed. By arranging a metal-film reflector at one end of the fiber delay line with FBGs written at different locations, one FBG for every fiber delay line can be saved (compared to FBG-only TID feeders) and flexibility of wavelength selection is also provided due to the uniform reflectance of the metal film in a broad wavelength range. A TTD feeder with two fiber delay lines for 10-GHz linear phased-array antennas is built to steer a beam into three directions at 0 degrees and +/- 30 degrees. The experimental results of the time delays agree well with those calculated at all the steering angles. (c) 2005 Wiley Periodicals, Inc.

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