Archimedean spiral

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Archimedean spiral

[¦är·kə¦mēd·ē·ən ′spī·rəl]
(mathematics)
A plane curve whose equation in polar coordinates (r, θ) is rm = am θ, where a and m are a positive or negative integer.
References in periodicals archive ?
Turner decided to wind the arms of a dipole antenna into the shape of an Archimedian spiral. The resulting spiral antenna was circularly polarized (CP) and wideband (WB); that is, it exhibited nearly constant impedance and bandwidth independence of frequency.[1]