Design of Horn and Open Waveguide Antennas at 915 MHz
Author(s)
Lu, Yenpao Albert
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Abstract
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.
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Date
2004-08-13
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Resource Type
Text
Resource Subtype
Technical Report