×

Dual band antenna for radio terminal

  • US 6,198,440 B1
  • Filed: 02/19/1999
  • Issued: 03/06/2001
  • Est. Priority Date: 02/20/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. 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; and

    a 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.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×