| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 103 === In this work, we developed a beam-forming system consisting of sixteen subarray antennas, each containing four aperture coupled patch antennas. Each of the subarray antenna is able to switch its beam pattern toward one of the nine zones over the half-space by adjusting the specific phase delay angles among the four elements. Furthermore, once all the subarrays are pointing at the same zone, a continuous beam-steering can be achieved by dynamically altering the progressive phase delay angle among the subarrays.
As far as a beam-forming system is concerned, the phase angle calibration of the array system is an extremely important issue. In this study, we couple a small portion of signal fed to each subarray and down-convert it into baseband for monitoring the phase angle deviation among the subarrays. A feedback control is subsequently carried out to tune the voltage of phase shifters for phase calibration.
Such a phased-array system can be applied in the point-to-point microwave or millimeter wave link. Specifically, the problem of alignment can be resolved by incorporating the beam-steering scheme. Moreover, its beam-forming function can generate a high directional radiation pattern toward the mobile user for further enhancing the receiver signal-to-noise ratio (SNR) and channel capacity accordingly.
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