Patent ID: 7312758
Filing Date: 2007-12-25
Classification: H01Q

Abstract:
1. A dual gain radio antenna, comprising a dielectric rod having an internal bore axially disposed within said dielectric rod along a longitudinal axis; a first antenna element comprised of a helically shaped conductor disposed around said longitudinal axis and supported by said dielectric rod; a second antenna element comprised of an elongated conductor disposed within said internal bore, said second antenna element movable between a retracted position and an extended position, a larger length of said elongated conductor extending from said bore when said second antenna element is in said extended position as compared to said retracted position; a sensor disposed within said dielectric rod and configured to detect when said second antenna element is in said extended position; a matching system and a relay controlling said matching system, all disposed within a portion of said dual gain radio antenna and responsive to said sensor, wherein said matching system includes an impedance matching circuit for said dual gain radio antenna; a contact element disposed on a portion of said second antenna element and positioned to form an electrical connection between said first antenna element and said second antenna element when said second antenna element is in said extended position; and means for removably coupling said dual gain radio antenna to a portable communications device.