Development of an interactive tutorial for teaching propagation in waveguides and radiation of electromagnetic waves - Posadas VG; Martin JMR; Frias CR; Gonzalez FJO; Martin JLL (Ieee Antennas And Propagation Society International Symposium, 1998 Digest - Antennas: Gateways To The Global Network - Held In Conjunction With: Usnc/Ursi National Radio Science Meeting, 1998)