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  • Basket winding is a pattern of winding electrical wire in a coil, used in making certain types of electronic components, such as inductors and transformers. The purpose of this type of winding is to minimize having adjacent turns of wire running parallel. In a basket winding the wires in successive layers of the coil cross each other at large angles, as close to 90 degrees as possible. Basket winding is employed in inductors for use at high frequencies, above 50 kHz, because it reduces energy losses. However, the physical dimensions of the coil are increased, which results in higher leakage inductance. Basket windings are used because they reduce losses due to two undesirable side effects that occur in coils at radio frequencies: proximity effect and parasitic capacitance. At high frequencies, the effect of the magnetic field of nearby parallel turns of wire causes the current in each wire to be concentrated in a small region at the surface of the wire, next to the adjacent wires; this is proximity effect. It increases the resistance of the wire, resulting in energy losses.