Design of Horn and Open Waveguide Antennas at 915 MHz
Lu, Yenpao Albert
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This report documents the design and operation of a portable outdoor antenna range, as well as antenna design and fabrication, and measurement techniques of practical antennas for RF tag measurement. The site of our field work is on the roof of the Van Leer building where multipath interference is minimal. A rectangular waveguide and a pyramidal horn are designed and built for 915 MHz for RFID illumination. Both antennas are designed for maximum radiation at 915 MHz with minimal ohmic loss. There are several important factors taken into the design of these two antennas, such as skin depth factor, cut-off frequency, and the structure of the radiating element. These antennas were mounted on a manual controlled rotating mast, and their radiation patterns were measured. Using the maximum gain of the radiation pattern, we can use the link budget formula to calculate the gain of the antennas and compare it with theoretical calculations. These characteristics will then be evaluated for research in wireless sensors and RFID.