Investigation of Parasitic Loop Counterpoise Antennas and Their Application to VOR Systems.

摘要

The radiation fields produced by conventional VOR and parastic loop counterpoise antennas were investigated both theoretically and experimentally. Theoretical expressions for the side band mode radiation fields produced by conventional VOR antennas were obtained by applying the concepts of geometrical theory of diffraction. Using similar techniques,expressions were obtained for both carrier and side band mode radiation fields produced by single parastic loop counterpoise antennas. It was found that for large separation distance between the parastic loops,the mutual coupling effects may be neglected during the evaluation of double parastic loop counterpoise antennas. (Modified author abstract)