Abstract: A mobile phone including a handset having a transceiver adapted for selective communication in cellular and satellite modes. The handset includes a cellular antenna adapted to receive cellular wavelength signals, a connector for a satellite antenna, and a switch adapted to selectively connect either the cellular antenna or the connector to the transceiver. The satellite antenna is adapted for selective connection to the connector of the mobile phone handset, the satellite antenna being adapted to receive satellite wavelength signals. The satellite antenna includes a cavity in a first portion adapted to receive and frictionally secure to the cellular antenna, and a plunger is adapted to engage the switch to disconnect the cellular antenna from, and connect the satellite antenna to, the transceiver when the satellite antenna is secured to the handset connector.

Abstract: Coaxial coupling systems and methods couple a first coaxial cable that includes a first inner conductor and first shield conductor to a second coaxial cable that includes a second inner conductor and a second shield conductor, through an insulator that includes first and second insulator surfaces. A first center plate and a first surrounding plate are adapted for attachment to the first insulator surface such that the first surrounding plate surrounds the first center plate on the first insulator surface. The first center plate is electrically connected to the first inner conductor and the first surrounding plate is electrically connected to the first shield conductor.

Abstract: A transmitter provides a radio wave with selectable polarization. The transmitter includes antenna feeds that generate orthogonal radio waves having non-linear polarizations that corresponds to the selectable phase relationships of a first and a second modulating signals. A spacial combination of the non-linear radio waves to produce a linearly polarized radio wave that has an orientation corresponding to a selected phase relationship.

Abstract: A wireless telephone having a wireless communication transceiver, a global positioning system (GPS) receiver, and a controller connected to both the wireless communication transceiver and the GPS receiver, wherein the controller intelligently adapts its GPS data maintenance schedule according to a unique set of indicators derived from the wireless telephone's operating conditions.

Abstract: A through-the-window coaxial coupler coaxially couples Radio Frequency (RF) signals between the inside and outside surfaces of a window. The through-the-window coaxial coupler includes an inside portion that mounts on the inside surface of a window, and an outside portion that mounts on the outside surface of the window and couples to an outside antenna. An inside electronic package couples to the inside portion of the through-the-window coaxial coupler, and is located adjacent the inside portion and remote from a radiotelephone. The inside electronic package includes a receive amplifier that amplifies RF signals that are received from the outside antenna via the through-the-window coaxial coupler and that provides the RF signals so amplified to the radiotelephone. In another embodiment, the inside electronic package may include a wireless transceiver and that wirelessly transmits and receives signals to and from a radiotelephone.

Abstract: Patch antenna systems for half-duplex communications which are capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separated transmit and receive frequency bands. The antenna systems according to the present invention generally comprise a patch antenna, transmit and/or receive circuit branches for tuning the patch antenna to resonate in separate transmit and receive frequency bands, and disconnection means for electrically isolating the transmit circuit branch from the antenna during periods of reception and for electrically isolating the receive circuit branch from the antenna during periods of transmission. Matching means, which preferably are implemented as part of the transmit and receive circuit branches, may also be provided for increasing the operating bandwidth of the antenna in both the transmit and receive frequency bands.

Abstract: Physically small quadrifilar helix antenna systems capable of providing a positive gain, quasi-hemispherical antenna pattern over a relatively broadband frequency range in the L-Band frequency band. The antenna systems according to the present invention generally comprise a quadrifilar helix antenna and at least one antenna feed network, and may further comprise matching means for improving the broadband frequency performance of the antenna. In a preferred embodiment, the elements of the quadrifilar helix antenna which form each bifilar helix are short-circuited at their distal ends, and energy is fed to and induced from the antenna via receive and transmit 90.degree. hybrid couplers which are electrically connected to the bifilar loops of the quadrifilar helix antenna.

Abstract: A quadrifilar helix antenna system capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separate transmit and receive frequency bands. This new antenna system comprises concentrically arranged, but electrically isolated, transmit and receive quadrifilar helix antennas, each of which comprises two bifilar helices arranged orthogonally and excited in phase quadrature. In the preferred embodiment, the antenna elements forming each bifilar helix are short-circuited at their distal ends, and energy is induced from the receive antenna and coupled to the transmit antenna via receive and transmit 90.degree. hybrid couplers which are electrically connected to the bifilar loops of the respective receive and transmit antennas. Also provided are switches or other disconnection means which are used to electrically isolate the transmit antenna during periods when the antenna is receiving a signal and to electrically isolate the receive antenna during periods of transmission.

Abstract: Quadrifilar helix antenna systems for half-duplex communications which are capable of providing a positive gain, quasi-hemispherical antenna pattern over widely separate transmit and receive frequency bands. The antenna systems according to the present invention generally comprise a quadrifilar helix antenna, first and second circuit branches for changing the resonant frequency of the antenna to first and second resonant frequencies corresponding to the transmit and receive frequency bands, and switches or other disconnection means which are used to electrically isolate the first circuit branch from the antenna during periods when the antenna is receiving a signal and to electrically isolate the second circuit branch from the antenna during periods of transmission.

Abstract: A quadrifilar antenna has first, second, third and fourth quadrature antenna elements with signals in a respective quadrature phase relationship. The antenna elements are coupled through a quadrature matching network to a transceiver circuit representing a load or a source. The matching network includes first, second and third transmission lines which are arranged in a "Z" configuration. The first transmission line matches impedances between the first and second antenna elements and communicatively couples the second antenna element with a quarter wavelength phase shift of its signals to the first antenna element. The second transmission line matches impedances between the third and fourth antenna elements and communicatively couples the fourth antenna element with a quarter wavelength phase shift of its signals to the third antenna element.

Abstract: A transceiver which operates in separate transmit and receive bands has a first conversion stage for generating a first IF signal translation of a receive signal, which first conversion stage also functions as a first and final, hence, single conversion stage for generating a transmit signal at its transmission frequency. A modulated transmit signal component used in the single conversion to the transmission frequency of the transmission signal has harmonics which lie outside the transmission band and is of a frequency which permits a substantial overlap of transmit and receive injection frequencies generated by a first numerically controlled signal generator which are applied to a first mixer of the first conversion stage during respective transmit and receive mode operations.