Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in

Abstract: A Planar Inverted F-Antenna (PIFA) comprising: a radiating element placed above a dielectric carriage with four side walls; a ground plane positioned below the dielectric carriage; a short circuiting element at the front edge of the radiating element; a feed tab at the front edge of the radiating element; vertical planes formed along the right and left edges of the radiating element forming capacitive loading plates; a first reactive loading slot formed in the radiating element between the short circuiting element and the left edge thereof; the open end of the first reactive loading slot being at the front edge of the radiating element; a second reactive loading slot formed in the radiating element between the feed tab and the right edge thereof; the open end of the second reactive loading slot being at the back edge of the radiating element; conductive stubs at the front and back edges of the radiating element for tuning lower and upper resonant frequencies; a conductive strip having a vertical attachment in

Abstract: A Planar Inverted F Antenna (PIFA) is disclosed comprising a radiating element and a ground plane positioned on a bottom cover. A Radome is positioned over the radiating element and the ground plane with the bottom cover and the Radome enclosing the radiating element and the ground plane. The ground plane is positioned below the radiating element and a conductive shorting strip extends between one end of the radiating element and one end of the ground plane. A feed lead extends from one side of the radiating element and has a base portion which protrudes outwardly of the Radome for connection to the center conductor of a RF power feeding cable. The radiating element includes a first horizontally disposed portion, a second horizontally disposed portion, and a substantially vertically disposed portion extending therebetween.

Abstract: A quadrifilar helix antenna of the present invention is used with a wireless device to transmit and receive signals. The antenna includes a plurality of helical antenna elements and an impedance transformer electrically connected to the antenna elements and connectable to the wireless device. The impedance transformer may be comprised of either a planar transmission line ¼ wave impedance transformer or a pi-network impedance transformer. The antenna may also be comprised of dual band quadrifilar helix antenna for transmitting or receiving two different frequency bands.

Abstract: A quadrifilar helix antenna of the present invention is used with a wireless device to transmit and receive signals. The antenna includes a plurality of helical antenna elements and an impedance transformer electrically connected to the antenna elements and connectable to the wireless device. The impedance transformer may be comprised of either a planar transmission line 1/4 wave impedance transformer or a pi-network impedance transformer. The antenna may also be comprised of dual band quadrifilar helix antenna for transmitting or receiving two different frequency bands.

Abstract: An adapter assembly for adapting a portable cellular telephone to receive an external replacement antenna or an external direct feed connection includes an adapter element and a retention element. The adapter element includes an antenna receiving bore at one end, and a positioning member at the other end, and further includes a latching member operable between first and second operative positions. The retention element includes a base cap with an extending actuator that biases the latching member into the second operative position where the adapter element is in engagement with body of the telephone.