Ground plane effects and measurements of portable planar broadband antennas

This paper deals with two of the most important and difficult aspects of portable planar broadband antennas: the ground plane effects and measurements. To minimize the ground plane effects, optimized slots are created on the ground plane to limit the current flow hence the ground plane effects, which is demonstrated to be a simple but effective approach. For the antenna measurement, our focus is on how to measure the antenna radiation efficiency accurately and efficiently. Two of the latest methods, reverberation chamber and source stirred chamber/cap methods, are employed and discussed. Both numerical and experimental results are presented to aid our analyses and discussions.