Cool Dry, Inc.

Spectrian Corporation

Wherenet Corporation

Lg Electronics Inc.

Varian Associates, Inc.

Lgc Wireless, Inc.

Widata Corporation

John Alan Eisenberg

David S Wisherd

Pablo Eugenio D'Anna

Donald K Belcher

Michael Andrew Wohl

Lance Todd Mucenieks

Brian L Baskin

David L Brubaker

Douglas C Bowman

Charles Stuart Robertson, Iii

Dieter Werner Statezni

Ronald J Hash

David Hart

Adam L Schwartz

Huong M Hang

Peter Forth

Steve Avis

A power converting system that includes: a rectifier configured to convert an input voltage into a output voltage and including an output node that is coupled to floating ground; a radio frequency (RF) power amplifier coupled to the rectifier and configured to generate a load voltage based on an RF clock and the output voltage; a detector coupled to the RF power amplifier and configured to detect the load voltage of the RF power amplifier; an integrator coupled to the detector and configured to generate a direct current (DC) voltage based on the detected load voltage; and a controller coupled to the integrator and configured to, based on the DC voltage, generate a control signal to adjust one or more features of the RF power amplifier is disclosed.

Power converting system

A clothes dryer apparatus () comprising an electrically conductive, grounded, generally cylindrical rotatable drum () having a hollow interior adapted to contain a load () of wet clothes to be dried. The drum's () exterior surface () is partially indented to form one or more integral, generally ring-shaped insulated notches (). An electrically conductive, generally flat arcuate anode () is positioned within each notch (), with no physical contact between an anode () and its corresponding notch (). Each anode () is spatially fixed with respect to the rotatable drum (), and is electrically isolated from conductive portions of the drum (). A source () of RF power (), operating at a single fixed frequency, is coupled to each anode ().

Fixed radial anode drum dryer

Methods and apparatus for heating an objectthat includes an absorbed medium. A method embodiment comprises: placing the objectincluding the medium into an enclosure; initiating a heating process by subjecting the objectand medium to a capacitive AC electrical field generated by an RF power sourceat a single low frequency; controlling the heating process by taking real time measurements; and making real time adjustments to the RF power sourcein response to the real time measurements. The objectsubstantially absorbs the medium in a first 'cool' state, and therefore has a maximum weight in the first 'cool' state. The objectis substantially free from the medium in a second &#x201c;heated&#x201d; state, due to substantial release of the medium from the object. The released medium is evaporated during the heating process. The heating process is completed when the objectis substantially transitioned into the second &#x201c;heated&#x201d; state. The method further comprises causing an air flowinside the enclosureto carry away evaporated medium out of the enclosure

Dielectric dryer drum

A method for RF dielectric heating an object having a variable weight including a medium is provided The method comprises: (A) placing the object having the variable weight including the medium into an enclosure; (B) adding an ionic substance to the medium; (C) initiating a heating process by subjecting the medium including the object to a variable AC electrical field; and (D) controlling the heating process. The method further comprises using an air flow having an ambient temperature, or being heated before getting into the enclosure, to carry away the evaporated medium from the enclosure.

Ionic adder dryer technology

A method for heating an object having a variable weight that includes a medium is provided. The method comprises: (A) placing the object having the variable weight including medium into an enclosure; (B) initiating a heating process by subjecting medium including the object having the variable weight to a variable AC electrical field; and (C) controlling the heating process. The object has substantially absorbed medium in a first 'cool' state and therefore includes a maximum weight in the first 'cool' state due to absorption of medium. The object is substantially free from medium in a second &#x201c;heated&#x201d; state due to substantial release of medium from the object, wherein the released medium is evaporated during the heating process. The heating process is completed when the object is substantially transitioned into the second &#x201c;heated&#x201d; state. The method further comprises using an air flow having an ambient temperature inside the enclosure to carry away the evaporated medium from the enclosure.

A method for heating a medium that includes an object having a variable weight is provided. The method comprises (A) placing medium including an object having variable weight into a variable enclosure having adjustable dimensions; (B) initiating a heating process by subjecting the medium including the object to a variable AC electrical field; (C) substantially continuously measuring an impedance of medium including the object during the heating process; (D) adjusting dimensions of said variable enclosure to optimize the heating process; (E) adjusting parameters of the variable AC electrical field to optimize the heating process; and (F) controlling the heating process.

High efficiency heat generator

This invention provides a method and system for distributing multiband wireless communications signals. Downlink RF signals in a plurality of downlink frequency bands are received and then combined into a combined downlink RF signal at the main unit. The combined downlink RF signal is subsequently split into multiple downlink RF-parts, which are converted to multiple downlink optical signals and optically transmitted to the remote units. At each remote unit, a delivered downlink optical signal is first converted back to a downlink RF-part which is subsequently separated into a plurality of downlink RF-groups by frequency band. Each downlink RF-group is individually conditioned (e.g., filtered and amplified). The individual-conditioned downlink RF-groups are then combined and transmitted to a dedicated downlink antenna.

Method and system for distributing multiband wireless communications signals

The unwanted influence a noise-source environment upon a modulated (e.g., FSK-encoded) magnetic field-based communication system is diminished by a non-modulated AC magnetic field communication scheme that uses a demodulatorless magnetic field detector. When installed in a tag to be tracked by a geolocation system, the demodulatorless detector responds when the tag comes within a prescribed proximity of the field generator producing the non-modulated AC magnetic field. The received signal is downconverted to baseband and processed to detect a valid AC magnetic field tone and indicate whether the tag is within a prescribed proximity of the AC magnetic field source.

Ultra-sensitive magnetic field receiver capable of operating in high noise environments

A closed loop, active cancellation technique (ACT)-based RF power amplifier linearization architecture injects a pilot tone as a 'pseudo distortion' signal into signal paths through first and second matched RF amplifiers, and a set of power minimization loops are closed around the RF amplifier pair. The power minimizing control loops control a set of vector modulators such that both the injected pilot tone and intermodulation distortion products are canceled, while RF carrier components constructively sum in the composite output of the two RF amplifiers.

Closed loop active cancellation technique (ACT)-based RF power amplifier linearization architecture

A communication system provides robust, short range radio communications between battery operated devices by using ON-OFF-KEYED (OOK) modulation and either frequency shift keyed (FSK) modulation or pulse position/width modulation (PPM/PWM), in combination with a prescribed communications protocol. The system transmitter requires no local oscillator and is only active during actual communication, so that its current drain is not a significant factor in total battery life. Also, the receiver is active for only a small fraction of time. The need for large, complex and expensive filters is minimized by using a single IF band-pass filter in active form or passively in the form of a low cost ceramic filter such as those used in inexpensive transistor radios. The digital transmitter and receiver portions of the system are implemented by low cost, and ultra low power CMOS logic.

Combined OOK-FSK/PPM modulation and communication protocol scheme providing low cost, low power consumption short range radio link

Linearity of an RF/microwave power amplifier is enhanced by an amplitude and phase distortion correction mechanism based upon signal envelope feedback, that operates directly on the RF signal passing through the power amplifier. A phase-amplitude controller responds to changes in gain and phase through the RF/microwave power amplifier signal path caused by changes in RF input power, DC power supply voltages, time, temperature and other variables, and controls the operation of a gain and phase adjustment circuit, so as to maintain constant gain and transmission phase through the RF/microwave power amplifier.

Polar envelope correction mechanism for enhancing linearity of RF/microwave power amplifier

An asset management radio location system uses time-of-arrival differentiation for random and repetitive spread spectrum, short duration pulse `blinks` from object-attached tags, to provide a practical, continuous identification of the location of each and every object within an environment of interest, irrespective whether the object is stationary or moving. Correlation-based RF processors determine which signals received by tag transmission readers are first-to-arrive signals as transmitted from any blinking tag, and an object location processor carries out time-of-arrival differentiation of these first-to-arrive transmissions from any blinking tag to determine where the respective object is located within the environment. A low power interrogation wand may be employed to refine the location of an object by a user programmed transmission-response exchange between the wand and the tag associated with the object of interest.

Radio location system for precisely tracking objects by RF transceiver

Polar envelope correction mechanism for enhancing linearity of

An RF power amplifier utilizes predistortion to improve linearity of the amplifier. RF carrier signals from an input terminal are coupled to a power amplifier through a first amplitude and phase adjustor serially connected with a predistortion amplifier having signal distortion characteristics of the power amplifier. A first control loop includes a subtractor for receiving RF carrier signals from the input terminal and signals from the predistortion amplifier and producing a predistortion signal for applying to the power amplifier through a path including a second amplitude and phase adjustor and an error amplifier. A first loop control unit receives the RF carrier signals from the input terminal and the distortion signal and produces control signals for the first amplitude and phase adjustor for minimizing RF carrier signals in the predistortion signal. A second control loop including a second loop control unit receives signals from the output of the power amplifier and signals from the predistortion amplifier and generates control signals for the second amplitude and phase adjustor to minimize distortion in signals at the output of the power amplifier. Each of the control units includes a digital signal processor for generating control signals for the amplitude and phase adjustor, and frequency reduction circuitry is provided in each of the control loops for reducing the frequencies of input signals to within the range of the digital signal processors.

RF power amplifier with signal predistortion for improved linearity

A monolithic microwave integrated circuit switch includes a series field effect transistor having a source drain path in series with an inductive transmission line including plural taps. Source drain paths of plural shunt field effect transistors are connected to the taps. The source drain paths of the series and shunt transistors are biased so that the series and shunt source drain paths have complementary low and high impedance states. The high impedance state is capacitive, having a value on the order of magnitude of the inductive transmission line. During a first time interval, the capacitive and inductive impedances form a matched low pass filter to supply current from a microwave source to a load. During a second time interval, current from the microwave source flows through the shunt field effect transistors to be decoupled from the load. The circuit is in stripline form, with source electrodes of field effect transistors including first and second arms respectively having first and second elongated parallel sides. First and second elongated edges of drain electrodes of the transistors extend parallel to the elongated sides. A gate electrode of each transistor includes first and second elongated fingers respectively extending parallel the elongated sides and edges. The first finger is between the first side and first edge; the second finger is between the second side and second edge.

Growing community of inventors

Los Altos, CA, United States of America

John Alan Eisenberg