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Air core inductor

Inductors and inductive devices are widely used in the fields of communication, radio transmission and reception, power conversion, magnetism, metal detection, and the like. In a high frequency circuit for use in various mobile communication devices such as a cell phone and a wireless LAN, an inductor element with an air core coil structure, such as a chip inductor, is used to cover frequency ranges up to several GHz for various purposes including impedance matching, resonating and choking. Variable inductors are commonly needed in high power, high frequency applications. In the past, variable inductors have been provided in high power, high frequency applications by both mechanically and electrically or magnetically controlled systems. Inductors and transformers have been fabricated in many forms, from large iron core transformers used at power frequencies to air core inductors used at radio frequencies. Radio frequency inductors and transformers have been enclosed in metal cans, non-conductive coil forms, open construction, fabricated onto a printed circuit board and the like. In some cases, air-core coils are used for inductor components for high frequency use. An air core coil is formed by winding a wire around a core made of a nonmagnetic material or by forming a coil pattern on a substrate made of a nonmagnetic material.

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