Category - Curved Antennas

AN-SOF simulations of axial-mode helical antennas closely match John D. Kraus’s classic measurements for gain and VSWR, confirming its accuracy. Using the Conformal Method of Moments, AN-SOF models true helix curvature, delivering reliable predictions for high-gain circularly polarized designs.

Helical Geometry The current distribution in a helical antenna of arbitrary size cannot be described in terms of simple series or elementary functions, so most of the available data has been obtained experimentally. The helical antenna was invented by Prof. John Krauss who has investigated its performance as a function of geometry extensively. Refer to “Antennas” […]

Assuming a uniform current distribution along a small circular loop > has allowed us to obtain closed-form expressions for the radiation resistance and directivity. When the loop circumference is comparable to the wavelength, the current distribution cannot longer be assumed uniform but a Fourier series is applied to approximate it. Also, a delta gap voltage […]

Among the advantages of the Conformal Method of Moments (CMoM) > implemented in AN-SOF is the ability to model exactly the contour of curved antennas. Besides, calculations at extremely low frequencies are possible or, equivalently, when the antenna size is a tiny fraction of a wavelength. Both advantages will be demonstrated in this article for […]