Measurement of antenna radiation efficiency using improved Wheeler cap algorithm

Wilken-Resman, Elias

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https://hdl.handle.net/2142/90975 Copy

Description

Title

Measurement of antenna radiation efficiency using improved Wheeler cap algorithm

Author(s)

Wilken-Resman, Elias

Issue Date

2016-04-29

Director of Research (if dissertation) or Advisor (if thesis)

Bernhard, Jennifer T.

Department of Study

Electrical & Computer Eng

Discipline

Electrical & Computer Engr

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

M.S.

Degree Level

Thesis

Keyword(s)

• antennas
• antenna radiation efficiency

Abstract

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.

Graduation Semester

2016-05

Type of Resource

text

Permalink

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

Copyright and License Information

Copyright 2016 Elias Wilken-Resman

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