Title :
HF broadcast transmitting antennas
Author_Institution :
Dept. of Electr. Eng., Howard Univ., Washington, DC, USA
Abstract :
An overview is presented of high-frequency (HF) broadcast transmitting antennas. For long-range broadcasting, high-power wideband directive antennas with slewing and beam shaping capabilities are needed. The design requirements, state-of-the-art, and the future trend of these antennas are discussed. Also discussed are the power-handling capability of the antenna, its mechanical requirements, and siting conditions. Currently available HF broadcast antennas are examined. It is shown that beam slewing in discrete steps can be achieved by phase adjustments between antenna elements and between antenna stacks. Continuous beam slewing in the horizontal direction is achievable, in principle, by the phased-array approach.<>
Keywords :
antenna arrays; broadcast antennas; directive antennas; HF broadcast transmitting antennas; beam shaping; beam slewing; high-power wideband directive antennas; long-range broadcasting; mechanical requirements; overview; phased-array approach; power-handling capability; siting conditions; Antenna arrays; Antennas and propagation; Bandwidth; Broadband antennas; Broadcasting; Dipole antennas; Directive antennas; Frequency; Hafnium; Transmitting antennas;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1988. AP-S. Digest
Conference_Location :
Syracuse, NY, USA
DOI :
10.1109/APS.1988.94344
