Novel approach to the measurement of Ultra Wideband antenna efficiency
; Mendes, C.
; Koohestani, M.
; Skrivervik, A.
Moreira, A. A.
IEEE Antennas and Wireless Propagation Letters Vol. 12, Nº , pp. 1512 - 1515, November, 2013.
ISSN (print): 1536-1225
Journal Impact Factor: 1,312 (in 2008)
Digital Object Identifier: 10.1109/LAWP.2013.2289948
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This letter presents a new cavity-based approach for measuring the radiation efficiency of ultrawideband (UWB) antennas. The procedure is based on a generalized Wheeler cap method that is only practical for narrowband measurements, and so this letter introduces an extension to UWB using source-stirring. The number of required measurements needed is relatively low and independent of the frequency span, therefore making the technique convenient for UWB. A complete post-processing procedure to automatically identify and remove erroneous radiation efficiency predictions is presented. The new method was tested with a coplanar-fed UWB monopole and compared to existing UWB efficiency cavity-based measurement methods. The results show good agreement with simulations and compare favorably to other UWB-centric methods, confirming the proposed approach as a good alternative to measure UWB antenna radiation efficiency.