Title :
Rotatable shortwave curtain antenna operable at very high wind speeds
Author :
Bruger, Peter ; Buchmann, Bernd ; Kurrer, Karl-Eugen ; Ozimek, Claudia
Author_Institution :
TELEFUNKEN Sendertech., Berlin, Germany
fDate :
3/1/1996 12:00:00 AM
Abstract :
Rotatable shortwave antennas enable broadcasters to cover target areas in any direction. This paper presents the concept and design of a rotatable curtain antenna characterized by a simple and robust design, which can be operated up to very high wind speeds. The deformation of the steel support structure is shown for typical cases of wind and ice loading, the results being obtained by FEM calculations. For the very high basic wind speed of 41 m/s (92 miles/h) the deflections of the dipole and reflector curtains are calculated and subsequently the RF characteristics for this situation. It is found that the influence of wind on the input impedance and the radiation patterns is remarkably low
Keywords :
antenna radiation patterns; broadcast antennas; dipole antenna arrays; electric impedance; finite element analysis; reflector antennas; 13 MHz; 15 MHz; 17 MHz; 19 MHz; 21 MHz; 26 MHz; FEM calculations; RF characteristics; broadcasters; deflections; deformation; design; dipole curtains; ice loading; input impedance; radiation patterns; reflector curtains; rotatable shortwave curtain antenna; steel support structure; very high wind speeds; Broadcasting; Dipole antennas; Directive antennas; Ice; Poles and towers; Robustness; Shafts; Transmitting antennas; Wind speed; Wire;
Journal_Title :
Broadcasting, IEEE Transactions on
