* Increased supported conductor diameter to 80 mm. * Added distributed capacitance calculation and display for the single turn loop. Values higher than 4 have no further effect on proximity resistance, but does reduce coil inductance which drives up the SRF. * Changed maximum spacing ratio c/a from 4.0 to 10.0. * Added antenna perimeter size in wavelength to the chart display as a new item. * Changed to V6 to capture the significant changes. * Renamed R-loss to R-loop to avoid confusion, as loop resistance is no longer the only resistance that contributes to losses. * Introduced a new slider "Re" to inject external losses to account for the combined losses due to capacitor contact resistance and ground losses. * Changed Q equation back to the original Xl/Rtot. * Changed Tuning Cap scale max from 2000 to 1000 pF. * Reduced display precision for Cap and Q in tooltip. * Added band wavelength to tooltip display.
* Tooltips are now justified, (using monospace fonts) and support changing metric prefix.
CANTENNA CALCULATOR EQUATIONS UPGRADE
* Upgrade Chart.js to the latest version, v3.5.1. White, "Performance of a Small Loop Antenna in the 3 - 10 MHz Band", IEEE Antennas and Propagation Magazine, 47, 2, April 2005, pp. Perks, "Loss Mechanisms in the Electrically Small Loop Antenna", IEEE Antennas and Propagation Magazine, 56, 4, August 2014, pp. Tap on a chart 'dot' to display a tooltip containing calculated output parameters for that frequency or band.Tap on legend items to disable or enable an output parameter.Perimeter (λ): Antenna perimeter size relative to the wavelength.Reactance (jΩ): The inductive reactance of the loop in ohms.R-loop (Ω): The calculated resistance of the loop in ohms, due to the combination of material conductance, conductor length, skin-effect and proximity effects.R-radiation (Ω): The calculated radiation resistance of the loop in ohms.Efficiency (%): The percentage of input energy that is actually radiated and not lost as heat.BW (kHz): The predicted 3dB bandwidth of the magloop antenna.Vcap (kV): The predicted voltage across the capacitance given the desired transmit power.Tuning Cap (pF): The capacitance required to bring the loop into resonance at the given frequency.cond : Total required conductor length in meters or feet.c : Distance between windings, measured from the conductor centers in mm or inches.peri : Perimeter of the main loop in meters or feet.C : Effective capacitance of the loop in picofarads.A : Loop area in square meters or square feet.Circ, Oct, Hex or Sqr : selects the shape of the magloop.Cu or Al : selects the type of metal conductor (annealed copper or aluminum).Metric or Imperial : selects the measuring system.Note that true ground losses are dependent on both frequency and height-above-ground. ideal conditions, with loop-related losses only).Īdding Re will reduce antenna efficiency, Q, Vcap and Ia, while increasing antenna BW.Īccording to and, a 1 m diameter loop of 22 mm copper tubing at a height of 1.5 m above the ground operating at 7 MHz had a calculated capacitor contact resistance of ~190 mΩĪnd an additional ground proximity loss resistance of ~30 mΩ. Use Re=0.0 to assume the loop is in free-space with no capacitor losses (i.e. Re : Additional resistance due to external losses, due mainly from capacitor contact resistance and proximity-to-ground effects.This affects the predicted voltage across the capacitor (Vcap), and the RMS loop current (Ia). (Must be >= 1.1)Ī low-value will increase the resistance due to the proximity effect. c/a : is the spacing ratio based on 'c' being the inter-winding spacing for multi-turn loops measured between conductor centers, and 'a' is the conductor diameter.(Measured between the conductor centers.) ⌀b : Loop diameter in meters (m) or feet (').(Measured between opposing conductor outer surfaces.) ⌀a : Conductor diameter in millimeters (mm) or inches (").Touch-screens and high-speed of modern mobile phones, to allow users to get realtime feedback of the predicted I developed this multi-turn capable magloop calculator to take advantage of the main loops made from either hollow round anodised-copper or aluminium conductors.circular, octagonal, hexagonal and square-shaped loops.The Magloop Antenna Calculator was developed to predict the characteristics of a small-loop (aka "magnetic loop" or "magloop")Īntenna, given physical dimensions entered via slider widgets.
0 kommentar(er)
