Extendable antenna for portable cellular telephones

Details Extendable antenna for portable cellular telephones Extendable antenna for portable cellular telephones

H - Electricity

01

Q

351/2

H01Q 1/24 (2006.01) H01Q 1/22 (2006.01) H01Q 9/30 (2006.01)

Patent

CA 1322785

CE00084R Abstract of the Disclosure An antenna for a portable cellular telephone includes a quarter-wavelength ground radiator and a helical coil capacitively coupled to an extendable half-wavelength radiator. The extendable half-wavelength radiator includes a metallic coil molded in plastic. The ground radiator includes a serpentined transmission line on a flexible circuit board. The helical coil and ground radiator are coupled by a transmission line to a duplexer. The duplexer couples transmitter signals from a radio transmitter to the antenna and receiver signals from the antenna to a radio receiver. The antenna may be advantageously utilized in any portable radio applications where small size and immunity to hand induced radiation losses are desired.

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