Antenna Array Fed by Compact Butler Matrix for Obstacle Detector.

• Main Authors: Hao-Ming Hsu, 徐浩銘
• Other Authors: Jwo-Shiun Sun
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/zhk8c7

碩士 === 國立臺北科技大學 === 電子工程系 === 106 === This paper proposes an obstacle detector, in order to to identify the direction of obstacle, for application of cleaning robots,. The system includes a patch antenna array, a compact butler matrix, a voltage detector network and Arduino UNO. Using transmission line and periodic open-circuit shunt stubs, both 3dB coupler and crossover are easily realized in planar circuit without additional components. A beamforming system was simulated. 2-D polar far field pattern are obtained, where four beams can be observed at their respective beam direction when each of input of Butler Matrix are fed with input signal. Four beams are produced at 15°, 47°, 312°, and 347° at 2.45GHz. After the receiving antenna receives the electromagnetic wave reflected by the obstacle. Take the output voltage value of the rectifier circuit to detect whether there is any obstacle in the working environment of the cleaning robot.