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Broadband Base Isolated Asymetrically Fed Vhf Antenna, Peter Edward Cunningham
Broadband Base Isolated Asymetrically Fed Vhf Antenna, Peter Edward Cunningham
Dissertations
Antennas presently being used for vehicular military VHF communications are narrowband. New generation frequency hopping radios, however, require broadband antennas. The antenna must be base isolated in order to reduce undesirable pattern nulls and impedance variations caused by currents induced on the support structure. Physical constraints limit the antenna length to three meters while operating from a frequency of 30 MHz to 88 MHz.
To satisfy the above requirements a model of a broadband, base isolated, cylindrical antenna less than three meters long was analyzed and built. Equations for the current distribution as a function of the physical parameters were …