Title :
Active loop-dipole aerials
Author :
Ramsdale, P.A. ; Maclean, T.S.M.
Author_Institution :
Lanchester Polytechnic, Department of Electrical Engineering, Coventry, UK
fDate :
12/1/1971 12:00:00 AM
Abstract :
A theoretical study of the input impedance of active loop-dipole aerials which possess height-reduction properties at resonance is made. This is compared with measurements on an aerial containing a BFY 90 transistor at 200 MHz for which the transistor parameters are available. Reasonable agreement is obtained. The existence of separate power gains and radiation patterns for transmitting and receiving is also established, and a comparison of the theoretical and experimental radiation patterns in the two cases is made. Numerical values of radiation resistance for these aerials are also calculated.
Keywords :
active antennas; antenna radiation patterns; dipole antennas; electrical impedance; resistance (electric); 200 MHz; active antennas; antenna radiation patterns; dipole antennas; impedance; radiation resistance;
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
DOI :
10.1049/piee.1971.0313
