Quotables
"To place a man in a multi-stage rocket and project him into the controlling gravitational field of the moon where the passengers can make scientific observations, perhaps land alive, and then return to earth--all that constitutes a wild dream worthy of Jules Verne. I am bold enough to say that such a man-made voyage will never occur regardless of all future advances."
Lee deForest, American radio pioneer ; 1957
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| Number | Title | Issue Date |
| 7831225 | Radio frequency power load and associated method A radio frequency power load and associated method. A radio frequency power load apparatus includes a container and a fluid having an ion source therein, the fluid being contained in the container. Two conductors are immersed in the fluid. A radio frequency transmis... | 11/09/2010 |
| 7801497 | Frequency scanning radio modulator and method A radio modulator and method with a radio band scan function. The apparatus consists of a frequency selectable RF signal transmitter, a switch that couples the RF signal to an antenna, and a demodulator coupled to mix a received antenna signal with the RF signal to ... | 09/21/2010 |
| 7499681 | Apparatus, system, and method for managing an antenna network during a half duplex call An apparatus, system, and method dynamically adjust an antenna network frequency response in accordance with an operation mode of a half duplex call. One of a plurality of antenna network configurations is selected based at least partly on the half duplex operation ... | 03/03/2009 |
| 7437130 | Smart tuning AM transmitter A radio transmitter is adapted to automatically adjust aerial impedance for a selected radio frequency. The radio transmitter includes a tunable radio frequency signal generator that has an impedance and is adapted to generate a radio frequency signal in the range o... | 10/14/2008 |
| 7394880 | Method and apparatus for simulating radio channel A radio channel simulator configured to read radio channel data describing a radio channel and user data including at least one user signal, and to simulate the radio channel using a FIR filter comprising one or more FIR blocks for filtering the user data read based... | 07/01/2008 |
| 7366473 | Method and apparatus for diversity switching control A method and apparatus for diversity switching control are generally described herein. According to one embodiment, a diversity control network is introduced which effectively reduces the number of coaxial cables required to interface with N antennas from the conven... | 04/29/2008 |
| 7359684 | Wireless communication system with variable intermediate frequency transmitter A wireless communication device (UST), comprising an input for receiving baseband data (I, Q) in a first signal having a first frequency. The device also comprises circuitry (681, 682) for increasing the first frequency, to form a... | 04/15/2008 |
| 7343015 | Method and apparatus for high fidelity wireless stereophonic transmission utilizing dual frequency carriers A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated fir... | 03/11/2008 |
| 7330708 | Tuning circuit with amplitude attenuation function and integrated circuit for radio communication apparatus There is disclosed a tuning circuit having a coil and a capacitor comprises a resistance-adjustment circuit connected in parallel with the coil and the capacitor. The resistance-adjustment circuit changes a resistance of the tuning circuit when resonant. The resista... | 02/12/2008 |
| 7251499 | Method and device for selecting between internal and external antennas In an RF front-end having a plurality of signal paths connectable to an internal antenna or an external antenna, an antenna switch part is used to select either the internal or the external antenna. In the antenna switch part, two series switches are used to operati... | 07/31/2007 |
| 7236802 | Coupling device for interfacing power amplifier and antenna in differential mode A coupling device for coupling an electronic circuit for at least one antenna unit to exchange electrical signals between the electronic circuit and the at least one antenna unit comprises a first input/output signal path, a matching unit coupled to the first input/... | 06/26/2007 |
| 7236741 | Methods and apparatus for tuning in an inductive system Electronic circuitry supports utilization of a series of pulses of varying width to tune a transducer (e.g., a coil that produces or receives a magnetic field) for transmitting or receiving. For example, a control voltage generator generates a sequence of digital pu... | 06/26/2007 |
| 7184720 | Method and device for simulating radio channel The invention relates to a method and device for performing channel simulation, the device comprising a set of channel simulation units (200 to 214) for simulating a radio channel, each unit comprising radio frequency parts (200A to 214A)... | 02/27/2007 |
| 7167686 | Wireless communications transceiver: transmitter using a harmonic rejection mixer and an RF output offset phase-locked loop in a two-step up-conversion architecture and receiver using direct conversion architecture A wireless transceiver includes a transmitter having a harmonic rejection mixer and an RF output phase-locked loop in a two step up-conversion architecture, and a direct conversion receiver. The transmitter includes a local oscillator for producing a signal at a mul... | 01/23/2007 |
| 7149482 | Compensation of filters in radio transmitters A radio transmitter for transmitting signals in a predetermined frequency band has a transmit filter and a compensating filter. The transmit filter filters a signal to be transmitted from the transmitter to suppress the transmission of parts of the signal outside th... | 12/12/2006 |
| 7149472 | Through-the-earth radio A through-the-earth communication system that includes a digital signal input device; a transmitter operating at a predetermined frequency sufficiently low to effectively penetrate useful distances through-the earth; a data compression circuit that is connected to a... | 12/12/2006 |
| 7142830 | Adaptive transceiver system A method for forming signals at a transceiver having at least two transmit and receive chains, the method comprising the steps of: (a) determining the phase difference and relative amplitude of signals from a set comprising a plurality of mobile stations as received... | 11/28/2006 |
| 7142811 | Wireless communication over a transducer device One aspect of the present invention is generally directed towards a system and method of tuning a transducer for transmitting and receiving a wireless signal. In an illustrative embodiment, a single transducer is coupled to a first or second circuit for either trans... | 11/28/2006 |
| 7127217 | On-chip calibration signal generation for tunable filters for RF communications and associated methods On-chip calibration signal generation circuitry is disclosed for filter tuning for radio-frequency communications and associated methods. On-chip circuitry generates a calibration signal that is used to help set a tuning control signal that is received by a tunable ... | 10/24/2006 |
| 7116966 | Transmitting/receiving filter device and communication device First and second transmission paths P1 and P2 are disposed between a first port #1 connected to an antenna ANT and a second port #2 connected to a transceiving circuit 10. The first transmission path P1 includes receiving fi... | 10/03/2006 |
| 7099635 | High-efficiency modulating RF amplifier The present invention, generally speaking, provides for high-efficiency power control of a high-efficiency (e.g., hard-limiting or switch-mode) power amplifier in such a manner as to achieve a desired modulation. In one embodiment, the spread between a maximum frequ... | 08/29/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
| 7012505 | Method and system for communication on a power distribution line A method and system of communicating on an active power distribution line using numerous asynchronous data transmitters. Data is modulated onto 5 KHz carrier signals of narrow bandwidth whose frequency is numerically derived from the power line frequency. The carrie... | 03/14/2006 |
| 6985702 | Transceiver with frequency multiplier tracked to frequency generator A transceiver has frequency generating means for generating a first signal at a first frequency. The frequency generating means has first tank means for resonating at the first frequency. The transceiver further has frequency multiplication means for multiplying the... | 01/10/2006 |
| 6980776 | Transceiver apparatus The present invention provides a transceiver apparatus that permits miniaturization even when the antenna thereof is an unbalanced circuit and the transmitter circuit section and receiver circuit section thereof are balanced circuits. The transceiver apparatu... | 12/27/2005 |
| 6906684 | Controlling a telescopic antenna mast A receiver receives an electromagnetic signal via an antenna mounted on an antenna mast. A signal evaluator determines or measures a signal quality level associated with the received electromagnetic signal. The signal quality compares the determined signal quality l... | 06/14/2005 |
| 6898419 | Remotely adjustable bandpass filter Remotely controllable actuators are provided to alter the cavity size of bandpass cavity filters to alter the bandpass characteristics. In one embodiment, a stepper motor is used to provide lateral movement of a tuning plate to alter the size of the cavity. The neck... | 05/24/2005 |
| 6804540 | Remote band-pass filter in a distributed antenna system A distributed antenna system in a communication system includes a programmable band pass filter at each antenna within the distributed system. Control information from a processor associated with the base station may instruct the band pass filter as to on which chan... | 10/12/2004 |
| 6766150 | System and method for tuning a narrowband cavity filter used in a CDMA transmitter There is disclosed a system for tuning a tunable narrowband cavity filter in a base station transmitter of a wireless network. The radio frequency (RF) transmitter comprises: 1) modulation circuitry for modulating an input baseband signal to produce a first RF signa... | 07/20/2004 |
| 6763227 | Systems and methods for modulator calibration Systems and methods are provided for calibration of a transmitter system modulator, wherein local oscillator nodes of a mixer are held at first and second voltages, and a first offset value is determined. The terminals are then held at third and fourth voltages and ... | 07/13/2004 |
| 6671501 | Signal transmission circuit The present circuit serves for the transmission of information signals over the general electricity supply mains. It has a transducer (13) for the galvanic separation of the mains voltage. The mains side winding (L1) of the transducer is connected in seri... | 12/30/2003 |
| 6597925 | Transmitter circuit with frequency self-optimization In a transmitter circuit designed to operate over a specified transmit frequency range, information as to the specific frequency within the specified transmit frequency range at which the transmit up-converter of the transmitter circuit is to be operated,... | 07/22/2003 |
| 6580900 | Tuning arrangement A tuning arrangement tunes a resonance module for wireless applications, e.g., wireless communication for a base station for mobile telephony system. The input and the output power signals of the resonance module are derived and information bearing parts ... | 06/17/2003 |
| 6295443 | Automatic tuning AM transmitter A radio frequency transmitter having a tunable radio frequency signal generator and an amplifier coupled to the tunable radio frequency signal generator. An aerial is coupled to the amplifier and transmits the amplified radio frequency signal, which may t... | 09/25/2001 |
| 6212367 | Mobile telephone apparatus with tunable filter tuned to the transmit band A mobile phone apparatus which is capable of meeting the stringent specifications on transmitter noise in the receive band. The mobile phone apparatus has a modulator for producing a signal to be transmitted in a transmit band, a power amplifier for suppl... | 04/03/2001 |
| 6115584 | Transmitter-receiver for use in broadband wireless access communications systems A transmitter-receiver includes a transmitting circuit for providing an output by converting the frequency of a transmission signal input thereto, a receiving circuit for providing an output by converting the frequency of a received signal input thereto, ... | 09/05/2000 |
| 6072993 | Portable radio transceiver with diplexer-switch circuit for dual frequency band operation A portable radio transceiver selectively transmits and/or receives RF signals in two frequency bands and in two modes of operation. The radio transceiver selectively switches between two antennas for operating in either of the two modes, such as a handhel... | 06/06/2000 |
| 6058294 | Adjustable frequency stabilizing internal chip capacitor system A transmitter system having an adjustable monolithic frequency stabilization and tuning internal capacitor circuit. The transmitter system has a transmitter for generating and transmitting a transmitter oscillator frequency signal. A data generating chip ... | 05/02/2000 |
| 5991606 | Apparatus for filtering signals of an antenna arrangement and a sender/receiver arrangement with two or more antennae A pair of filter units directs incoming signals from an antenna and outgoing signals to the antenna. One of the filter units blocks the outgoing signals and passes the incoming signals while the other of the filter units blocks the incoming signals and pa... | 11/23/1999 |
| 5689219 | Summing network A summing network for combining and feeding radio frequency signals supplied by radio transmitters to common antenna means, includes conductors, connectors and a stub. In order to make the tuning of the summing network easier, the stub includes a changer ... | 11/18/1997 |
