Improved efficiency measurement and analysis methods using an overmoded wheeler cap

The purpose of this paper is to extend the Improved Wheeler Cap measurement method to cases where the cavity is expected to overmode. Numerical processing methods will be applied to reduce the error introduced by overmoding cavity losses. The WIPL-D simulation tool is used to simulate the antenna in free space and in the Cap.

[1]  B.M. Kolundzija.  Electromagnetic modeling of composite metallic and dielectric structures , 1996, Trans Black Sea Region Symposium on Applied Electromagnetism.

[2]  I. Kasa.  A circle fitting procedure and its error analysis , 1976, IEEE Transactions on Instrumentation and Measurement.

[3]  R. H. Johnston,et al.  An improved small antenna radiation-efficiency measurement method , 1998 .

[4]  Ronald H. Johnston.  Efficiency simulations on a Vivaldi antenna in a Wheeler Cap , 2009, 2009 IEEE Antennas and Propagation Society International Symposium.

[5]  Vaughan R. Pratt,et al.  Direct least-squares fitting of algebraic surfaces , 1987, SIGGRAPH.

[6]  H. A. Wheeler.  The Radiansphere around a Small Antenna , 1959, Proceedings of the IRE.

[7]  B. Kolundžija.  Electromagnetic modeling of composite metallic and dielectric structures , 1996, IEEE Antennas and Propagation Society International Symposium 1997. Digest.