Hollinworth Fund, L.l.c.

Other

Tyco Electronics Services Gmbh

Rayspan Corporation

Gula Consulting Limited Liability Company

Woo Yong Lee

Maha Achour

Ajay Chandra Gummalla

Alexandre Dupuy

Raul Inocencio Alidio

Cheng Jung Lee

Gregory Poilasne

Bruce J Tatarchuk

Cheng-Jung Lee

Rasik H Raythatha

Vladimir Penev

Nhan Duc Nguyen

Raul Alidio

A system includes a transmit filter () in a transmit path to couple to an antenna () and pass signals in a transmit band. A receive filter () is disposed in a receive path to couple to the antenna and to the transmit filter to pass signals in a receive band different from the transmit band. An enhanced frequency variable impedance () is used to provide isolation between signals in the transmit and receive bands on the receive path. A phase and magnitude controlled feedback path can also be used to cancel transmit signals in the receive path.

Duplexer with enhanced isolation

A system includes a plurality of band pass filters to pass signals in separated frequency bands to or from an antenna. A matching network provides characteristic impedances. The system is designed such that the configuration of the matching network and BPFs provides high impedance to the band pass filters for those routing paths other than the band pass path as these routing paths do not transmit or receive the signals at this particular pass band. The system is further designed such that the configuration of the matching network and BPFs provides minimal insertion loss for the band pass path of for transmission and receipt of signals at this particular pass band, where each routing path has a corresponding pass band. The matching network is for coupling to an amplifier, when frequency separation is needed at the output of the amplifier to the BPFs. In one embodiment an impedance network tunes the impedance by using varying length transmission lines.

Switchless band separation for transceivers

Architectures and implementations of a transceiver system for wireless communications are presented, the system including one or more antennas supporting a single frequency band or multiple frequency bands, a transmit circuit, a receive circuit, and an isolation circuit that is coupled to the one or more antennas and the transmit and receive circuits and provides adequate isolation between the transmit circuit and the receive circuit.

RF front-end module and antenna systems

Designs and techniques associated with power amplifiers for amplifying RF signals to provide variable power amplification and improved linearity in various RF amplification circuits, including power amplifiers operated under the power back-off conditions.

RF power amplifiers with linearization

Mixed pillared clays having good thermal stabilities and high surface areas made by liquid phase methods in which an aluminum hydroxy polymer and at least one separate transition metal hydroxy polymer are prepared and mixed with a swelling clay in respective amounts to satisfy selected percentages of the cationic exchange capacity of the clay, are reduced to produce metallic transition metal domains.

Mixed pillared clay reduction products and method of preparation

Growing community of inventors

San Diego, CA, United States of America

Woo Yong Lee