antenna 4cm, 10 turns - Wolfram|Alpha Results

Computing...

Input information:

$helical antenna | \nhelix circumference | 4 cm (centimeters)\nhelix pitch angle | 10 turns\nnumber of turns | 10\ncenter wavelength | 3.75 cm (centimeters)$

Formulas:

$p = (L\/lambda)\/(S\/lambda+(2 N+1)\/(2 N)) | HP = (52 °)\/((C sqrt((N S)\/lambda))\/lambda)\nD = (15 (C\/lambda)^2 N S)\/lambda | AR = (2 N+1)\/(2 N)\nR_in = (140 C)\/lambda | S = C tan(alpha)\nL = sqrt(C^2+S^2) | | \nC | helix circumference\nN | number of turns\nalpha | helix pitch angle\nlambda | center wavelength\np | velocity factor\nHP | half-power beamwidth\nD | directivity\nAR | axial ratio\nR_in | input impedance$

Results:

$p | 0.874838\nHP | 35.55° (degrees)\nD | 32.0993\nAR | 1.05\nR_in | 149.3 Omega (ohms)$

Radiation pattern:

$\n(axial mode of operation, valid for dimesions:wavelength ~ helix circumference )$