| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 104 === In this these, a digital beamforming for directed searching system is implemented. The system contains two way, including Quasi-Yagi antenna, band-pass filter, mixer and IQ demodulator. According to the physical mechanism of the system, the antenna spacing can be obtained by incident wave’s phase difference. The operation frequency of this system is 925 MHz. Besides, the system has dual conversion receivers. The frequency band of first down conversion receivers will be double side band (875 MHz and 975 MHz). What we want is the lower side band, so a band-pass filter is adopted to remove upper side band. And the frequency band of another one is baseband. In order to achieve digital beamforming, a digital signal process is applied.
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