Electric fields and vector potentials of thin cylindrical antennas
Abstract
The vector potential and electric field generated by the current in a centerdriven or parasitic dipole antenna that extends from z = h to z = h are investigated for each of the several components of the current. These include sin k(h  absolute value of z), sin k (absolute value of z)  sin kh, cos kz  cos kh, and cos kz/2  cos kh/2. Of special interest are the interactions among the variously spaced elements in parallel nonstaggered arrays. These depend on the mutual vector potentials. It is shown that at a radial distance rho approximately = h and in the range z = h to h, the vector potentials due to all four components become alike and have an approximately planewave form. Simple approximate formulas for the electric fields and vector potentials generated by each of the four distributions are derived and compared with the exact results. The application of the new formulas to large arrays is discussed.
 Publication:

IEEE Transactions on Antennas and Propagation
 Pub Date:
 September 1990
 DOI:
 10.1109/8.56999
 Bibcode:
 1990ITAP...38.1456K
 Keywords:

 Antenna Arrays;
 Current Density;
 Cylindrical Antennas;
 Electric Fields;
 Coupling Circuits;
 Dipole Antennas;
 Potential Fields;
 Communications and Radar