Motorola Corporation

Craig L Fullerton

Hugh Robert Malone

Cynthia C Matthews

Thomas Peter Emmons, Jr

Jonathan Henry Gross

Shawn Wesley Hogberg

Warren L Seely

James William Startup

Robert Anthony Peters

Douglas J Mathews

Ronald Dee Fuller

Michael Lee Fraser

Ronald F Kielmeyer

Richard M Dougherty

John Richard Erlick

Jim E Helm

Mary Maureen Madine

John G Lambrou

John D Goshinska, Jr

Michael Dane Ince

Paul L Brownlee

Richard J Christensen

Dawn M McCraw

Susan L Harris

Allen H &lsquo;Skip&rsquo; Nelson

John Daniel St Peter

David L Krueger

A wireless communications system infrastructure includes an integrated unit of RF and switch components mounted on a transportable platform for providing a communications link to a public switched telephone network. An airplane for executing a predetermined flight pattern includes a repeater for communicating with the integrated unit of RF and switch components and provides a link between the integrated RF and switch components and operational handsets within a repeater geographic area of coverage corresponding to the flight pattern. The wireless communications system infrastructure is therefore capable of being positioned strategically with respect to terrestrial cell stations and with respect to a flight pattern of the plane carrying the repeater to provide coverage to areas that otherwise may be out of range of an airborne repeater and conventional wireless system infrastructure components.

Transportable infrastructure for airborne cellular system

A method of increasing satellite communication quality by using a MEO satellite constellation ( ) and a LEO satellite constellation ( ) in combination with a decision algorithm which selects the appropriate constellation to route a communication signal through. The decision algorithm can be embodied in three ways: gateway based ( ), individual subscriber unit based ( ) and satellite based ( ). The MEO constellation ( ) and LEO ( ) constellation may be cross-linked, allowing for switching of service between satellites, as needed, during a communication session.

System for providing optimal satellite communication via a MEO/LEO satellite constellation

A complimentary switched amplifier transceiver (10) is provided which offers performance advantages and reduces system complexity over conventional half-duplex transceivers by using complimentary switched amplifiers for eliminating switches. Power output to a channel transition (31) from a transmit amplifier (26) is not degraded by a switch insertion loss in a transmit mode. Receiver noise figure is not degraded due to the switch insertion loss from the channel transition (31) to a receive amplifier (27). Switch devices and their associated control lines are eliminated, reducing circuit complexity for complimentary switched amplifier circuits such as a combined amplifier switch (12) and a first bi-directional amplifier (22).

Complimentary switched amplifier transceiver system

An RF test equipment and wire bond interface circuit (150) for facilitating the on-wafer (100) testing of integrated circuits (120) has an electrical interface (102,104,106), for providing electrical coupling to the IC (120) and a low-pass filter structure connected between the electric interface (102,104,106) and the IC (120). The low-pass filter structure comprises a first inductive element (108) connected in series with the electrical interface (102,104,106) for simulating wire bond reactances, a second inductive element (114) connected in series with the first inductive element (108) for making contact with the IC (120) and at least one capacitor (110,112) connected between ground and a point common to both the first (108) and the second (114) inductive elements, for providing shunt capacitance and defining a Tee type low-pass matched filter at the input (121) and the output (123) of the IC (120). The RF test equipment and wire bond interface (150) assure the on-wafer performance of the IC (120) will correspond to its off-wafer performance, despite the addition of wire bonds (127,129 and 133,135).

RF test equipment and wire bond interface circuit

A FET structure has first and second active areas separated by an inactive area with a gate bus located thereon. Gate fingers extend from the gate bus between source and drain contacts on the active areas. Bridges extend over the gate bus and interconnect the source contacts.

Center tapped FET

A wideband active quadrature 90 degree hybrid for increased bandwidths with low power losses and the capability to have gain. The 90 degree hybrid can be incorporated in small areas for MMIC (monolithic microwave integrated circuits) circuitry in the low microwave frequencies. The 90 degree hybrid comprises a plurality of 90 degree phase shift means, each preceded by an input amplifier. Each of the 90 degree differential phase shift means comprises a high pass and a low pass filter. The low pass filter outputs are added together and amplified. The high pass filter outputs are also added together and amplified. The resultant amplified signals are output with a phase differential of 90 degrees. The amplifiers supply gain which is lost in the 90 degree phase shifting.

Wideband MMIC active quadrature hybrid

Inductorless bias networks include a bias circuit having a bias return path which is coupled to and biases a variable impedance device in a relatively nonconductive state. Another bias circuit including a FET renders the variable impedance device relatively conductive in response to control signals so that one port is coupled to another port, for instance.

Broad band microwave biasing networks suitable for being provided in

The present invention consists of a crossover for coplanar waveguides. A pair of microstrip/strip line conductors are transitioned into coplanar conductors on opposite sides of a substrate. This places the electrical and magnetic fields in an orthogonal relation so as to reduce the possible interference. Once crossed the coplanar conductors are transitioned back to microstrip/strip line conductors.

Coplanar waveguide crossover

Growing community of inventors

Chandler, AZ, United States of America

Craig L Fullerton