Abstract
In this paper, a smart antenna with self-sensing capability and 2-D switchable beams is proposed. The antenna can automatically detect and switch its beam to track the user moving in 2-D environment, so that the user is always locating in an optimum state of radio wave coverage. The detecting system used in antenna employs microwave radar sensors to sense the target, and the controlling system uses the STM51 MCU to control the beam direction. The smart antenna in this paper uses a 2 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\times 2$</tex> microstrip patch array as the radiation structure and a compact 4 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\times 4$</tex> Butler matrix as the feeding network. The receiving power of the smart antenna system is measured in an indoor environment, which validates the efficiency of the design.
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