Coilspiral

Coilspiral is a term used to describe a spiral-shaped coil or a spiral-wound conductor, used across several disciplines such as electronics, geometry, and design. It does not denote a single standardized object, but rather a family of related forms that share a spiral winding.

In geometry, a coilspiral can refer to a curve generated by winding a line around an axis as it progresses along that axis, producing a three-dimensional spiral similar to a helix but with deliberate radial growth. In planar form, it describes spiral patterns produced by gradually increasing radius with angle, encompassing classical forms such as Archimedean and logarithmic spirals. The exact definition of coilspiral varies with the application and context.

In electronics and RF engineering, coilspirals are often planar spirals cut into a substrate to form inductors or antennas. Planar spiral inductors provide a compact footprint and broad inductance range, but introduce parasitic effects influenced by substrate properties and conductor geometry. Spiral antennas, using similar geometry, are valued for wideband reception or transmission and compact form factors.

Manufacturing considerations for coilspirals include conductor thickness, spacing between turns, substrate material, and interactions with neighboring components. The concept also appears in art and jewelry, where decorative spiral coil motifs are employed for aesthetic effect.

See also: spiral, coil, helix, planar inductor, spiral antenna.