Notes:
The Magloop Antenna Calculator was developed to predict the characteristics of a small-loop (aka "magnetic loop" or "magloop")
antenna, given physical dimensions entered via slider widgets. It assumes the main loop is made from a round
anodised copper or aluminium conductor. I developed this multi-turn capable magloop calculator to take advantage of the
touch-screens and high-speed of modern mobile phones, to allow users to get realtime feedback of the predicted
behaviour of a magloop antenna. This would help a radio amateur to decide on the characteristics for the build. -- 73 de VK3CPU
Inputs via the slider and radio widgets:
⌀a : Conductor diameter in millimeters (mm) or inches (").
⌀b : Loop diameter in meters (m) or feet (').
N : Number of turns or loops.
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. (Must be >= 1.1)
A low-value will increase the resistance due to the proximity effect.
Tx : The transmit power in Watts. This affects the predicted voltage across the capacitor (Vcap), and the RMS loop current (Ia).
Metric or Imperial : selects the measuring system.
Cu or Al : selects the type of metal conductor (annealed copper or aluminum).
Calculated parameters:
L : Inductance in microhenries.
A : Loop area in square meters or square feet.
C : Effective capacitance for multi-turn loops in picofarads.
circ : Circumference of the main loop in meters or feet.
c : Distance between windings, measured from the conductor centers in mm or inches.
cond : Total conductor length in meters or feet.
Tuning Cap (pF): The capacitance required to bring the loop into resonance at the given frequency. Value in picofarads.
Vcap (kV): The predicted voltage across the capacitance given the desired transmit power.
BW (kHz): The predicted 3dB bandwidth of the magloop antenna. This is calculated from the predicted Q and the center frequency.
Efficiency (%): Calculated from the radiation resistance divided by the sum of radiation resistance and the loss resistance.
R-radiation (Ω): The calculated radiation resistance of the loop in ohms.
R-loss (Ω): The calculated loss resistance of the loop in ohms, due to the combination of material conductance, skin-effect and proximity effects.
Reactance (jΩ): The inductive reactance of the loop in ohms.
Q : The quality factor, which is the reactance divided by the resistance of the loop at that frequency.