VLF-LF Wide Shift FSK Antenna Feed Networks

摘要

The problem of broadbanding VLF and LF antennas for wide shift FSK modulation has been solved by recourse to static feed networks, which exhibit either two separate passbands centered at the mark and at the space frequency respectively, or a single wide passband extending over the frequency shift. Several configurations of one-port and of two-port networks have been developed: these exhibit minimum number of elements, with values that are economically realizable. The new antenna feed networks could be applied to existing antenna installation without excessive modifications. (Author)