Andrew Corporation

Donald G Jackson

Mano Dorsey Judd

Gregory Allan Maca

Thomas D Monte

Russell Hoppenstein

Jonathon C Veihl

Jeramy Scott Leonard

Barry Mark Fisher

Greg S Maca

A base station signal is applied to antenna elements. One signal from a first element is electrically modified and evaluated in conjunction with a second, unmodified signal from a second element. The modified signal is further modified and again evaluated with the unmodified signal. The results of the two evaluations are compared to determine a relative phase and/or amplitude at the respective elements.

Relative phase/amplitude detection system

Several feed-forward RF power amplifiers configured for use in a distributed array, each having a main amplifier within a carrier null loop and an error amplifier within an error loop. Each carrier null loop includes a switch configured to selectively disable the carrier null loop, thereby disabling the carrier null loop, and injecting an actual RF signal into the error loop allowing the error loop to be optimized using the actual RF signal.

Optimization of error loops in distributed power amplifiers

A zero-bias bypass apparatus for a low noise amplifier includes a bypass circuit, and a switching circuit coupled with a low noise amplifier and with the bypass circuit. The switching circuit includes one or more solid state devices responsive to absence of a control bias for switching an RF input signal from said amplifier to the bypass circuit with a low insertion loss and high isolation.

Zero-bias bypass switching circuit using mismatched 90 degrees hybrid

An antenna system for tower-top installation includes an antenna array of M&times;N antenna elements, a corporate feed for operatively interconnecting said antenna elements, a backhaul channel for communicating with ground-based equipment, and radio frequency circuits for processing radio frequency signals between the antenna array and a backhaul link. The radio frequency circuits include substantially all of the circuits required for the processing of radio frequency signals between the antenna array and the backhaul link.

Antenna system architecture

A zero bypass apparatus for a low noise amplifier includes a bypass circuit, and a switching circuit coupled with a low noise amplifier and with the bypass circuit. The switching circuit includes one or more solid state devices responsive to absence of a control bias for switching an RF input signal from said amplifier to the bypass circuit with a low insertion loss and high isolation.

Zero-bias bypass switch

A distributed antenna device includes a plurality of transmit antenna elements, a plurality of receive antenna elements and a plurality of amplifiers. One of the amplifiers is a power amplifier operatively coupled with each of the transmit antenna elements and mounted closely adjacent to the associated transmit antenna element, such that no appreciable power loss occurs between the power amplifier and the associated antenna element. At least one of the amplifiers is a low noise amplifier and is built into the distributed antenna device for receiving and amplifying signals from at least one of the receive antenna elements. Each power amplifier is a relatively low power, relatively low cost per watt linear amplifier chip.

Transmit/receive distributed antenna systems

A distributed antenna device includes a plurality of transmit antenna elements, a plurality of receive antenna elements and a plurality of power amplifiers. One of the power amplifiers is operatively coupled with each of the transmit antenna elements and mounted closely adjacent to the associated transmit antenna element, such that no appreciable power loss occurs between the power amplifier and the associated antenna element. At least one of the power amplifiers is a low noise amplifier and is built into the distributed antenna device for receiving and amplifying signals from at least one of the receive antenna elements. Each said power amplifier is a relatively low power, relatively low cost per watt linear power amplifier chip.

Growing community of inventors

Garland, TX, United States of America

Donald G Jackson