Theoretical and Experimental Investigation of the Impedance of a Vertical Monopole Over Perfect, Imperfect, and Enhanced Ground Planes.
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1997
- Accession Number
- ADA325446
Entities
People
- Michael A. Rupar
Organizations
- United States Naval Research Laboratory