The most common description for metal detector coils are: concentric, elliptical, and Double D.
Concentric Coil
A concentric coil "having a common center." is probably the most commonly used coil. These coils are round, some being very thin in height, some thicker, some with open holes in the center, making them shaped like a flattened donut, and some are solid.
Elliptical Coil
This style of coil also gets its name from the shape of the coil. Instead of the round shape of the concentric coil, it is merely oval shape resembling a flattened circle.
Double D Coil
The Double D coil is a coil which has the winding in the shape of the letter D.
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