Pires, NunoMendes, CarlosKoohestani, MohsenSkrivervik, AnjaMoreira, António Alves2013-11-112013-11-112013-11-11201310.1109/LAWP.2013.228994https://infoscience.epfl.ch/handle/20.500.14299/96798WOS:000328053100002This Letter presents a new cavity-based approach for measuring the radiation efficiency of Ultra Wideband (UWB) antennas. The procedure is based on a generalized Wheeler cap method (GWCM ) 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.Antenna measurementsAntenna efficiencyWheeler capSource-stirringUltra wideband antennastext::journal::journal article::research article