Extension and validation of equivalent source helical antenna modeling with the FDTD code
✍ Scribed by Gianluca Lazzi; Qi-Shan Yu; Om P. Gandhi
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 111 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0895-2477
No coin nor oath required. For personal study only.
✦ Synopsis
Since small-diameter, normal-mode helical antennas are often used for cellular telephones, accurate modeling of these antennas using the FDTD grid is a must if this preferred method, allowing anatomically based heterogeneous simulation of the body, is to be used for calculating the performance of personal wireless de¨ices. An easy-touse rectangular FDTD grid is, howe¨er, subject to staircasing for the helical geometry. An approach using equi¨alent electric and magnetic sources has pre¨iously been presented by the authors, although not thoroughly tested for cases where the diameter of the helix may be more than two times the FDTD grid size. In this letter, we present a modified weighted equi¨alent source method and its experimental ¨alidation for such larger diameter helical antennas. The grid is selected to conform to the o¨erall dimensions of the helix. The calculated field ¨ariations for a lossy sphere representati¨e of the human head agree well with the measured data.