Dual band antenna for radio terminal

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;
• and
• a fixing element for fixing the helical antenna and the whip antenna to the 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 the helical antenna when said whip antenna is in an extended position.

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 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 and an isolation element extending from an upper end of the conductive core line, wherein the whip antenna is operable at the two different frequency bands using a periodic resonant frequency thereof;
• and
• a fixing element for fixing the helical antenna and the whip antenna to the radio terminal, wherein the fixing element has an upper end connected to a lower end of the helical antenna and a through hole via which the whip antenna is inserted into an interior of the radio terminal, said conductive substance extending from said lower end of said helical antenna to a point beyond the helical antenna when said whip antenna is in an extended position.