Accuracy improvement of relational expressions regarding effective length vector of a dipole and expansion to V‐shaped dipole

• Published in: IET microwaves, antennas & propagation antennas & propagation, 2022-10, Vol.16 (13), p.812-821
• Main Authors: Iigusa, Kyoichi, Yamamoto, Shin‐ichi, Miura, Amane, Tsuji, Hiroyuki
• Format: Article
• Language: English
• ISSN: 1751-8725; 1751-8733
• DOI: 10.1049/mia2.12297

The accuracy of formulas for calculating le(0) and α is improved, which are parameters representing the effective length vector of a dipole, from the length L and the width W of the dipole. The input resistance R and the input reactance X of the dipole can be approximately related to each other by using le(0) and α. The relational expression can be applied accurately when the dipole is about half a wavelength or shorter, but it can be modified to be accurate up to about a wavelength by expressing the influence of the change in beam width due to the dipole size using le(0). The authors found that this approximate relational expression can be applied to a V‐shaped dipole if the dipole length is about half a wavelength or shorter. The applicable range is extended to about a wavelength by introducing the cross‐polarized component of le(0). The formulas for calculating le(0) and α from the size parameters L and W and the bending angle ψ are also presented.