Abstract: A switched, dual helical, retractable, dual band antenna for a cellular communication device comprising a device which functions at two specific frequency bands when in the retracted mode and which functions at two specific frequency bands when in the extended mode. The antenna includes an elongated radiator which is in circuit when the antenna is in its extended position and includes inner and outer helical radiators which are in circuit when the antenna is in the retracted mode.

Abstract: A microstrip antenna comprising a substrate, a radiating element constructed on the top surface of the substrate, a ground plane on the bottom surface of the substrate, a through hole at a position corresponding to the radiating element of the substrate, and a power feeding conductor at a position corresponding to the radiating element on the substrate.

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: A retractable antenna is provided for a wireless communication device such as a wireless modem, two-way radio, cellular telephone, etc., wherein the extended length of the antenna is greater than the height of the telephone housing. The antenna includes components which are slidably mounted with respect to one another so that the antenna may be collapsed and retracted within the telephone housing.

Abstract: An antenna is provided for a wireless communication device such as a handheld radio or cellular telephone. The antenna may be either embedded internally in the transceiver or may be mounted externally thereof. The antenna comprises a pair of 1/4 wave radiating elements which are coupled out of phase to create an end fire bi-directional pattern for the antenna. The radiating elements are attached to a micro-strip transmission phasing device which is comprised of a center conductor, a ground plane and a substrate material. The micro-strip transmission phasing device supplies a zero degree to one hundred eighty degree phase shift from one radiating element to the other radiating element.

Abstract: A universal inductive battery charger is described including an inductive battery charger having a charging coil which creates magnetic flux lines when the charging coil is energized. The battery charger is adapted to charge a battery pack, through induction, when the rechargeable battery pack is placed on the battery charger. The battery pack includes a pick-up coil which will have an electrical current induced therein when the battery pack is positioned adjacent the battery charger. The battery pack includes a circuit for rectifying the induced current in the pick-up coil to charge the battery cells in the battery pack.

Abstract: An antenna for a portable, wireless communication device comprising an antenna sheath having the mechanical components of the antenna positioned therein. The sheath is provided with a first bore formed in the base end thereof which is adapted to receive an electrically conductive, connector element therein. The sheath is also provided with a second bore formed therein at the inner end of the first bore which is adapted to receive a first helical antenna element therein. The sheath is further provided with a third bore formed therein at the inner end of the second bore which is adapted to receive a second helical antenna element therein. The second and third bores have a plurality of longitudinally extending, radially spaced-apart ribs protruding inwardly into the bores for engagement with the antenna elements therein to position the antenna elements in the bores and to create air dielectric chambers between the sheath and the antenna elements.

Abstract: An apparatus and method for producing molded coils of the present invention includes a molding machine having threaded spindles for receiving the coils to be molded. The coils are threaded over the spindles so that during the molding process the pitch and diameter of the coils are accurately maintained. The process is automated by use of a controller and automated assembly machinery. The controller and automated assembly machinery integrate a coil winder, a molding machine, and an auto bagger to automate the entire process of producing the molded coils.