@conference {12_IMS_Leal-SevillanoRuiz-CruzMontejo-GaraiEtAl_UpperFrequencyLimit, title = {Upper Frequency Limit of the Power Loss Method for the Estimation of Ohmic Losses in Hollow Metallic Waveguides}, booktitle = {2012 IEEE MTT-S International Microwave Symposium Digest}, year = {2012}, month = {June}, pages = {1-4}, issn = {0149-645X}, author = {C A Leal-Sevillano and J A Ruiz-Cruz and Montejo-Garai, J R and Rebollar, J M} }