Patent ID: 6198440
Filing Date: 2001-03-06
Classification: H01Q

Abstract:
A dual band antenna for a radio terminal comprising:a helical antenna including first and second helical portions, having first and second constant pitches, respectively, the first and second helical portions being independently operable at different frequency bands;a whip antenna including a conductive core line, a conductive substance covering a first portion of the conductive core line to serve as a choke and an isolation element extending from an upper end of the conductive core line, for filling a gap between the conductive core line and the conductive substance, wherein only the first portion of the conductive core line is operable at a first frequency band and the entire conductive core line is operable at a second frequency band; anda fixing element for fixing the helical antenna and the whip antenna to a radio terminal, said fixing element having an upper end connected to a lower end of said helical antenna, said conductive substance extending from said lower end of said helical antenna to a point beyond said helical antenna when said whip antenna is in an extended position.