| Summary: | 博士 === 國立臺北科技大學 === 電腦與通訊研究所 === 102 === In dissertation, we invented and proposed a beam switching structure which can form the array antenna system with multiple phase difference by grouping multiple beam switchers. The proposed beam switching structure can be easily deployed at the RF front end of given communication transceiver without any baseband/IF hardware modification.
Such array antenna system is called the adjustable phased shift array (APSA) in which the complexity is only 1 4. The angle of APSA can be designed arbitrarily. The beam direction is controlled by digital bit streams and can be switched fast. In addition, the fabricated APSA circuit can be taken as the building block of more complicated applications.
The key advantage of the APSA circuit is the simplicity. The APSA circuit consists of three RF switches, three branch line couplers, and six phase shifters, which can not only reduce complexity, PCB area, and PCB layers, but also be cost effective, and therefore the APSA circuit can be easily manufactured.
The APSA structure is born at the moment we tried to reduce the complexity of Butler matrix while making the experimental circuit board, which is both innovative and practical. At the present time we have developed a 12-beam APSA circuit and verified that the pattern measured matches the simulation results using MATLAB. The APSA structure can be widely deployed for future communication demands such as multiple antenna system, SU/MU-MIMO, and array antennas.
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