Measurement of antenna radiation efficiency using improved Wheeler cap algorithm

Radiation efficiency measurement can inform the wireless design process by determining the total fraction of accepted power radiated by an antenna. The popular Wheeler cap method can be used to quickly and accurately determine the radiation efficiency of small antennas. However, due to cavity resonant modes and the use of a simplistic equivalent circuit model, the conventional Wheeler cap method yields poor results for electrically larger structures. When efficiency estimates can be obtained, they are often valid only over a narrow frequency band. Higher-order equivalent circuit models may be employed in a modified Wheeler cap algorithm to generate improved radiation efficiency measurements. Guided by advances in broadband modeling of antennas, we demonstrate a new Wheeler cap technique that makes use of parallel admittance subcircuits. We then illustrate the use of this technique to provide improved efficiency estimates at the operating frequencies of electrically larger structures.

Name thesis:degree_name

M.S.

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Electrical & Computer Engr

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2016

Author dc:creator

• Wilken-Resman, Elias

Contributors dc:contributor

• Bernhard, Jennifer T.

• antennas
• antenna radiation efficiency

Statement dc:rights

• Copyright 2016 Elias Wilken-Resman

Language dc:language

en

Handle dc:identifier

http://hdl.handle.net/2142/90975

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/90975