Abstract: A Time-Delay Transmit Diversity (TDTD) RF device is described for use to enhance the transmit performance of wireless communications systems. Time delayed signals are added to diversity antennas to increase coverage and capacity of wireless base stations. Performance is improved by reducing the effects of multipath fading while taking advantage of the additive effects of Rake receivers used in mobiles.

Abstract: A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.

Abstract: A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.

Abstract: A RF device such as a tower mounted amplifier (TMA), mast-head amplifier (MHA), or Tower Mounted Boosters (TMB) includes a housing having a plurality of cavities and an input and an output, the input being coupled to the antenna and the output being coupled to a base station. The housing includes a transmission path holding multiple coaxial resonators. The housing further includes multiple receive paths including at least one path having a plurality of cavities, each cavity containing a dielectric resonator. The metallic transmit resonator nearest the antenna input is coupled to the first dielectric resonator via a common resonant wire. The last dielectric resonator in the receive path is coupled to a first metallic resonator of a downstream clean-up filter via another common resonant wire.

Abstract: Methods and apparatus are provided for optimizing a receive side subsystem of a cellular communication system with a transmit side subsystem of the system. The receive side subsystem includes one or more superconducting components, preferably a superconducting filter, coupled to an amplifier, preferably a low noise amplifier. The transmit side subsystem includes a transmitter and, preferably, a power amplifier. The system matches and balances the range or radius of the received side subsystem with the range or radius of the transmit side subsystem. As a result, the receive range and the transmit range of the system overlap. A control system configured to match and balance the subsystems is optionally provided.

Abstract: Methods and apparatus are provided for a cellular communication system including superconducting components. More particularly, the inventions of this system include a tower mounted transmitter/receiver system having one or more antenna disposed atop a tower. The system includes a receive side subsystem having at least one superconducting component, such as an HTS filter. The system further includes a transmit side subsystem having an amplifier, preferably a power amplifier. The receive side subsystem and the transmit side subsystem are both disposed atop the tower substantially adjacent the antenna. Duplexed and multiplexed systems may be utilized. One or more connections may be provided between the tower mounted transmitter/receiver system and the ground or base station.

Abstract: Novel structures and methods utilize layered copper oxide release materials to separate oxide films from growth substrates. Generally, the method comprises the steps of: first, forming a layered copper oxide sacrificial release material on a growth substrate, in the preferred embodiment being the high temperature superconductor YBCO grown on a compatible substrate such as LaAlO3, second, forming an oxide film on the layered copper oxide release material, in the preferred embodiment, a ferroelectric, an optical material or a oxide film compatible with further high temperature superconductor growth, such as SrTiO3 or CeO2, and third, etching the layered copper oxide release material so as to separate the oxide film from the growth substrate. Optionally, additional layers may be grown on the oxide film prior to etching.

Abstract: The present invention comprises a high quality, epitaxial thallium-based HTS thin film on MgO and other substrates and methods of providing the same. The present invention is achieved using a nucleation layer which provides a template for subsequent growth. Specifically, YBCO and/or YBCO analog films (films having growth characteristics and physical structures analogous to YBCO) are used as nucleation layer(s) on MgO and other substrates to enable the growth of epitaxial thallium-based HTS films.

Abstract: Methods and reactors are described for the production of high temperature superconductor films on a variety of substrates, particularly those films which include volatile components during their manufacture. The reactors are particularly useful for producing films containing thallium. The reactors provide for relatively low volume cavities in which the substrate is disposed, and control of the thallium oxide overpressure during the processing. In a preferred embodiment, one or more holes or apertures are made in the reactor to permit thallium and thallium oxide to controllably leak from the reactor. For manufacture of double sided superconducting films, a reactor is used having top and bottom plates each with one or more holes in them. Uniform high temperature superconducting films are obtained while inhibiting reaction between the substrate and superconducting film during the processing.

Abstract: Novel articles are provided of thin super-conductive thallium-based copper oxide layers on inorganic, usually crystalline substrates. Novel methods are provided for ease of producing such articles, particularly involving sol-gel techniques and laser ablation. The articles have a highly oriented superconductive thallium-based copper oxide film, particularly epitaxial, with high superconductive transition temperatures and desirable electrical properties. The subject articles find use in a wide variety of electronic applications, particularly in microwave and millimeter wave devices.

Abstract: Methods and reactors are described for the production of high temperature superconductor films on a variety of substrates, particularly those films which include volatile components during their manufacture. The reactors are particularly useful for producing films containing thallium. The reactors provide for relatively low volume cavities in which the substrate is disposed, and control of the thallium oxide overpressure during the processing. In a preferred embodiment, one or more holes or apertures are made in the reactor to permit thallium and thallium oxide to controllably leak from the reactor. For manufacture of double sided superconducting films, a reactor is used having top and bottom plates each with one or more holes in them. Uniform high temperature superconducting films are obtained while inhibiting reaction between the substrate and superconducting film during the processing.

Abstract: Methods and reactors are described for the production of thallium cuprate based high temperature superconductor films on a variety of substrates. The reactors provide for low volume cavities, means for rapidly heating and cooling to and from a predetermined elevated temperature and control of the thallium oxide overpressure during the processing. Uniform high temperature superconducting films are obtained while inhibiting reaction between the substrate and superconducting film during the processing.

Abstract: An epitaxial thallium-based copper oxide superconducting film is formed on a crystalline substrate by metalorganic deposition which comprises forming a film of carboxylate soap solution on said substrate, prepyrolyzing said film at a temperature of 350.degree. C. or less and pyrolyzing said film at a temperature of 800.degree.900.degree. C. in the presence of oxygen and an overpressure of thallium for a sufficient time to produce said epitaxial superconducting film.