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Category - Curved Antennas


Gain and VSWR of Helix in Axial Mode
This article is based on the geometric parameters for the helix defined in this link >. A helical antenna operating in axial mode can be a highly directional radiator. Its radiation pattern consists of a main lobe and several secondary lobes, as Fig. 1 shows. The gain increases as the number of turns increases for […]
Gain of Helix in Normal Mode
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” […]
Input Impedance and Directivity of Large Circular Loops
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 […]
Radiation Resistance and Directivity of Small Loops
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 […]