Analysis of a coil-loaded wire antenna

✍ Scribed by Mitsuo Taguchi; Kiyomi Yamashita; Kazumasa Tanaka; Toshiyuki Tanakas

• Publisher: John Wiley and Sons
• Year: 1993
• Tongue: English
• Weight: 616 KB
• Volume: 76
• Category: Article
• ISSN: 8756-6621
• DOI: 10.1002/ecja.4410760107

✦ Synopsis

An analysis method using Pocklington's integral equation is presented for wire antennas with lumped inductive loading along its arm. In the formulation of the integral equation, using the equivalence principle, the equivalent electric and magnetic currents on the coil surface are expressed instead of tbe current flowing on the coil and the electric field. The boundary condition that the axial component of the total electric field vanishes is applied on the antenna axis including the coil. Piecewise-sinusoidal functions are used for the current expansion functions and the weighting functions.

The numerical calculation is made for the different numbers of turns, pitch, and radius of the coil loaded at the midpoint or the top of a dipole antenna. The good agreement between calculated and measured values for the cwrent distribution and input impedance are obtained. The analysis method proposed in this paper is applicable to antemas with resistive or capacitive loading by changing the expressions for the equivalent currents on the surface of loads.