EXPERIMENTAL AND THEORETICAL IMPEDANCES AND ADMITTANCES OF CENTER-DRIVEN ANTENNAS
Abstract
The theoretical evaluation of the series inductance and parallel capacitance of the lumped network, the correction factor Z sub delta - Z subo (where Z sub delta is the load impedance and Z subo the idealized impedance), and Z subo were considered in determining the apparent impedance of the antenna. Values of impedance of 10 or more ohms were accurately determined by the King- Middleton second-order theory. The third-order conductances and resistances were lower and higher, respectively, than corresponding second-order terms. To express properties of a cylindrical antenna as a load impedance terminating a line of characteristic impedance, Z subc, terminal functions of over-all attenuation of the load, rho, and over-all phase shift, phi, were used. Hartig's experimental results (Cruft Laboratory technical report no. 107) were re- evaluated and found to be in accord with the King-Middleton theory. A comparison of theoretical curves based on the Hallen second-order, King-Middleton second- order, and Schelkunoff first-order formulas with experimental results showed that the King-Middleton curves agreed best with experimental data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1953
- Accession Number
- AD0011434
Entities
People
- Phyllis A. Kennedy
- Ronold King
Organizations
- Harvard University