| Summary: | 碩士 === 長庚大學 === 電機工程學系 === 100 === Due to the rapidly development of technology recently. In military
they hope that they can use the satellite radar to adjust the location where
they need. According to this principle they develop the technique called
beam-forming which has the advantage of adjustment without mechanical
movement. By using the changes of phase or time delay to drive the
different elements of antenna and to approach their goal. But using the
change of phase usually accompany with beam squint. To avoid this short
using the optical true time delay line to get this technique has become
more and more popular.
This article is about using optical true time delay line to combine the
array antenna, testify the experiment setup of phased array antenna under
6.15GHz frequency. The system includes power splitter, Mach-Zehnder
modulator, Semiconductor Optical Amplifier, Power Amplifier,
Dispersion Compensating Fiber, Photo-Detector, and Attenuator. Laser
light through dispersion compensating fiber cause the negative dispersion
can achieve the change of phase, by using the difference of dispersion
cause by different dispersion compensating fiber under the different
wavelength to get the phase that we need. By controlling the main lobe’s
or side lobe’s combination can get our system shift about -22 degree to 33
degree also it can link up with tunable laser to automatic scan to achieve
the manpower saving.
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