Accession Number : ADA325446

Title :   Theoretical and Experimental Investigation of the Impedance of a Vertical Monopole Over Perfect, Imperfect, and Enhanced Ground Planes.

Descriptive Note : Interim rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Rupar, Michael A.

PDF Url : ADA325446

Report Date : 30 APR 1997

Pagination or Media Count : 81

Abstract : The impedance characteristics of a vertical monopole over an imperfect ground are investigated theoretically and experimentally. An expression for the change in antenna input impedance from an imperfect to a perfect ground, AZ, is introduced, and is used to generate results which illustrate the effects of ground. constants (the earth's conductivity and relative dielectric constant) on the input impedance of a vertical monopole. Calculated results are presented correlating the change in impedance to varying ground conditions and extended to the inclusion of a radial ground screen. Theoretical analysis is compared with ground constant measurements that were conducted at three locations around the Washington, DC, area. Antenna impedance measurements were performed on monopoles of various heights at one of the surveyed locations, and at the Naval Research Laboratory's Brandywine Test Facility.

Descriptors :   *ANTENNA RADIATION PATTERNS, *MONOPOLE ANTENNAS, ELECTRICAL CONDUCTIVITY, DIELECTRIC PROPERTIES, ELECTRICAL IMPEDANCE, ELECTROMAGNETIC WAVE REFLECTIONS, ELECTRICAL MEASUREMENT.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE