Title :
Radiation characteristics of an insulated antenna in an arbitrary homogeneous medium
Author :
Ghods, A.H. ; Rahmat-Samii, Y.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
An insulator dipole with axisymmetric geometry in an arbitrary medium is studied. The radiation properties of electromagnetic fields of such an antenna are investigated. It is demonstrated that the surface of integration should be closed because the currents on the caps of the insulator make a significant contribution to the fields and input impedance of the insulator dipole. It is observed that the insulated antenna has a more uniform near field along the antenna than the bare antenna. Also, it is seen that the coating material changes the effective length, near field, and input impedance of insulated antennas.<>
Keywords :
antenna radiation patterns; dipole antennas; axisymmetric geometry; coating material; currents; effective length; electromagnetic fields; homogeneous medium; input impedance; insulated antenna; insulator dipole; near field; radiation properties; surface of integration; Boundary conditions; Conductors; Dielectrics and electrical insulation; Differential equations; Dipole antennas; Magnetic analysis; Magnetic fields; Moment methods; Surface impedance; Surface treatment;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1991. AP-S. Digest
Conference_Location :
London, Ontario, Canada
Print_ISBN :
0-7803-0144-7
DOI :
10.1109/APS.1991.175093
