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Helical antenna

An antenna is used to transmit and receive electromagnetic energy typically in the form of radio frequencies upon which have been modulated telephony and data communications. Helical antennas are widely used in mobile stations. A helical antenna is an antenna in which copper lines are helically wound on a core made of an insulative material, thereby enabling the size of the antenna to be reduced. The performance of the helical antenna greatly affects the performance of the mobile station. A mobile phone has a helical antenna formed in an outward protrusion and a whip antenna. When the whip antenna is contained in the mobile terminal, the helical antenna is operational, and when the whip antenna is extended, the whip antenna is operational. Helical antennas are widely used in portable communication devices, such as cellular phones, because of their wideband characteristics and the advantage of requiring less space. A helical antenna comprises one or more elongated conductive elements wound in the form of a screw thread to form a helix. The helical antenna has a spiral configuration which protrudes from a top of the terminal and has an advantage in that it can communicate regardless of the orientation of the terminal. The performance of such an antenna depends on the shapes of the terminals on which it is mounted and a matching circuit is provided between the antenna and a duplex in order to compensate the difference in performance.

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