Transceiver having retractable antenna assembly

Communications: radio wave antennas – Antennas – With radio cabinet

Patent

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Details

343729, 343862, 343900, H01Q 124

Patent

active

056359438

ABSTRACT:
A transceiver (10) having a retractable antenna (12) that substantially reduces interference when the antenna is in a retracted position. The transceiver (10) includes transceiver circuitry (T), operating at a predetermined frequency, electrically connected to the retractable antenna (12). The retractable antenna (12) includes two antenna elements (20, 22). A first antenna element (20) comprises a whip antenna element, movable within a conductive tube (14) housed within a cellular telephone case (C). A second antenna element (22) comprises a helical coil antenna element extending from the whip antenna element (20) and located outside the case (C). In the retracted position, a first contact assembly (76) contacts the whip antenna element (20). The first contact assembly (76) is electrically connected to the transceiver circuitry (T) through a conductor (96) which is a predetermined multiple of a quarter wavelength at the predetermined frequency. In the retracted position the whip antenna element (20) and the conductive tube (14) form a coaxial transmission line so that only the helical coil antenna element (22) is electrically active and the whip antenna element (20) does not radiate internal to the case (C). In the extended position, a second contact assembly (74) contacts the whip antenna element (20) such that the whip antenna element (20) and the helical coil antenna element (22) are both electrically active. In the extended position, the lower conductor (86), the conductive tube (14) and the first contact assembly (76) act as a predetermined multiple of a one-quarter wavelength stub and appear as an open circuit to the transceiver circuitry.

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patent: 5521605 (1996-05-01), Koike

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