Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7928817 | Switchable high pass filter/low pass filter phase shifter having a switch circuit with FETs connected in parallel A switch circuit in which the cut-off characteristic is improved over a wide range of frequencies in the microwave band includes a first field-effect transistor functioning as a switch element, a second field-effect transistor and an inductor. A serially connected c... | 04/19/2011 |
| 7843282 | Phase shifter with flexible control voltage The invention provides a phase shifter with flexible control voltage that is useful with all RF systems that phase shift a RF signal. The phase shifter according to the present invention may comprise transistors used as switching elements. In one aspect, the phase s... | 11/30/2010 |
| 7839237 | Phase shifter with flexible control voltage The invention provides a phase shifter with flexible control voltage that is useful with all RF systems that phase shift a RF signal. The phase shifter according to the present invention may comprise transistors used as switching elements. In one aspect, the phase s... | 11/23/2010 |
| 7812689 | Phase shifter including a resonant type switch with a free region Disclosed is a microwave phase shifter including switches each of which utilizes resonance between an off-capacitance of an FET and an inductor connected in parallel with the off-capacitance of the FET, an LPF, and an HPF, a series circuit of an inductor and an MIM ... | 10/12/2010 |
| 7683738 | Adjustable delay transmission line A transmission line includes a signal conductor and at least one varactor diode capacitively coupled to the signal conductor. The transmission line's signal path delay is a function of its shunt capacitance, and the varactor's capacitance forms a part of the transmi... | 03/23/2010 |
| 7570133 | Wideband passive amplitude compensated time delay module A true time delay (“TTD”) system with wideband passive amplitude compensation is provided. The TTD system includes an input switch, an output switch, a reference delay line disposed between the input switch and the output switch, and time delay lines disposed be... | 08/04/2009 |
| 7561007 | Switchable phase shifter for providing selectable phase shift paths A switchable phase shifter includes an RF coupler arrangement which simultaneously produces 0° and 180° signals, together with controllable switches which select the desired phase of output signal while maintaining the coupler arrangement terminated. ... | 07/14/2009 |
| 7541894 | Phase-shifting circuit and multibit phase shifter A phase-shifting circuit includes: a first parallel circuit which is connected across input and output terminals of a high frequency signal, composed of a first inductor and a first switching element that exhibits a through state in an ON state and a capacitive prop... | 06/02/2009 |
| 7535320 | Phase shifter with flexible control voltage The invention provides a phase shifter with flexible control voltage that is useful with all RF systems that phase shift a RF signal. The phase shifter according to the present invention may comprise transistors used as switching elements. In one aspect, the phase s... | 05/19/2009 |
| 7498903 | Digital phase shifter Digital phase shifter, comprising series connection of controlled phase shifting bits (3a-3k), each of them inserts determinate amount of phase delay of the passing signal, wherein the phase change occur in response to the control signal ... | 03/03/2009 |
| 7495529 | Phase shift circuit, high frequency switch, and phase shifter Provided is a small-size phase shift circuit having a broad band characteristic. The phase shift circuit includes: a first switching element for switching between a through path and a capacitance capacity; a second switching element for switching the capacitance cap... | 02/24/2009 |
| 7369828 | Electronically tunable quad-band antennas for handset applications An electronically tunable quad-band antenna which includes a tunable high band antenna tuned by at least one tunable varactor associated therewith; the tunable high band antenna further includes a substrate, a patch element on said substrate, at least one voltage tu... | 05/06/2008 |
| 7358834 | Transmission line voltage controlled nonlinear signal processors Waveguide nonlinear signal processors include transmission lines defined on a substrate. A plurality of varactors or pairs of varactors are situated along the transmission line and are in communication with a signal conductor of the transmission line and one or more... | 04/15/2008 |
| 7355492 | Electronically controlled hybrid digital and analog phase shifter The inventions presented herein provide a electronically controlled phase shifters that incorporate analog and digital phase shift architectures in a novel manner that realizes the best advantages of each architecture. This combination of complementary phase shift a... | 04/08/2008 |
| 7352325 | Phase shifting and combining architecture for phased arrays Improved phased array techniques and architectures are provided. For example, a linear phased array includes N discrete phase shifters and N−1 variable phase shifters, wherein the N−1 variable phase shifters are respectively coupled between adjacent output nodes... | 04/01/2008 |
| 7336143 | Variable delay line using variable reactance devices to provide reflected delay signals First and second reactance parts are connected with the first and second output terminals of a hybrid coupler. The first and second reactance parts have a substantially identical reactance X. ... | 02/26/2008 |
| 7324043 | Phase shifters deposited en masse for an electronically scanned antenna A system and method for an electronically scanned antenna is provided in which phase shifters are deposited en masse along with other electronically scanned antenna components on a wafer scale substrate using a thin film process. Alternative wafer scale sizes may be... | 01/29/2008 |
| 7321274 | RF switch A RF switch can be used in a wide frequency range and can be manufactured at a low cost. The RF switch changes a signal passing through a waveguide with a variable device that is switchable between the first state in which the variable device has a high resistance a... | 01/22/2008 |
| 7315225 | Phase shifter providing multiple selectable phase shift states A single-structure, two-bit phase shifter useful for steering the beam of an antenna such as an aeronautical antenna. The phase shifter includes an input line, an output line, a plurality of switched lines such as quarter-wavelength microstrip lines connected direct... | 01/01/2008 |
| 7302461 | Analog delay elements Systems and methods provide analog delay elements, which may be utilized in isolation or in a cascade. For example, a delay element may include a broadband amplifier and a passive, programmable filter, which may provide a desired magnitude and group delay response o... | 11/27/2007 |
| 7302249 | High dynamic range mixer apparatus and balun therefor A wide dynamic range mixer which has a high linearity passive balun fabricated on a Si substrate for receiving an input RF signal and an active balun for receiving a local oscillator signal. The active balun includes high frequency, low voltage SiGe transistors to a... | 11/27/2007 |
| 7301419 | Filtering type frequency switching circuit Two lines Ai1 (i=1 or 2) are connected to an input terminal In. The line Ai1 is grounded via a capacitor Ci1. The line Ai1 and a line Bi1 form a coupled line. One end of the line Bi1 is connected to a pos... | 11/27/2007 |
| 7302011 | Quadrature frequency doubling system The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45... | 11/27/2007 |
| 7292124 | Variable resonator and variable phase shifter A variable resonator is provided which comprises signal conductor 13 formed on top side surface of dielectric substrate 12, ground conductor layer 11 formed on back side surface thereof and switches 14, wherein signal conductor comprises ... | 11/06/2007 |
| 7292198 | System and method for an omnidirectional planar antenna apparatus with selectable elements A system and method for a wireless link to a remote receiver includes a communication device for generating RF and a planar antenna apparatus for transmitting the RF. The planar antenna apparatus includes selectable antenna elements, each of which has gain and a dir... | 11/06/2007 |
| 7289001 | Dielectric substrate for oscillator An oscillator includes a phase shifter and a power distributor which are disposed in a dielectric substrate comprising a plurality of stacked dielectric layers. The phase shifter comprises a coupler and a reflecting circuit. The dielectric substrate has a first form... | 10/30/2007 |
| 7276993 | Analog phase shifter using cascaded voltage tunable capacitor A circuit topology is configured to flatten out a phase- and amplitude-response over a specified range of frequencies. The circuit topology also provides a large cumulative phase-shift. In one embodiment, the circuit topology cascades a plurality of all-pass section... | 10/02/2007 |
| 7274276 | Amplifier circuit, gyrator circuit, filter device and method for amplifying a signal An amplifier circuit comprising a transconductor device connected to a phase shifter section. The phase shifter section has an adjustable phase shift and an impedance at least partially dependent of the frequency of an input signal. In use, the adjustable phase shif... | 09/25/2007 |
| 7274277 | Ferroelectric devices and method relating thereto The present invention relates to an electrically controllable/tunable microwave device comprising a ferroelectric substrate with a variable dielectric permitivity and conducting electrodes, arranged on said substrate, and the capacitance of which depends on applied ... | 09/25/2007 |
| 7268643 | Apparatus, system and method capable of radio frequency switching using tunable dielectric capacitors An embodiment of the present invention provides an apparatus, comprising a radio frequency switch capable of using tunable dielectric capacitors as the switching element. The apparatus may further comprise a cross connector connecting a plurality of ports and wherei... | 09/11/2007 |
| 7259642 | Antenna control unit and phased-array antenna A paraelectric transmission line layer and a ferroelectric transmission line layer are laminated through a ground conductor, and plural phase shifters, which are connected via through holes that pass through the ground conductor, are disposed on both of the transmis... | 08/21/2007 |
| 7250814 | Variable gain amplifier A method of varying the gain of an amplifier and an amplifier array are provided. The amplifier array includes two or more amplifier stages (201, 202) connected in parallel with each amplifier stage having a gain control means. Input signal means (203, 204... | 07/31/2007 |
| 7248108 | Power amplifier employing thin film ferroelectric phase shift element An amplifier includes a signal splitter operable to receive an input signal and generate at least first and second split signals, a first amplifier adapted to receive the first split signal and to generate a first amplified signal, and a second amplifier adapted to ... | 07/24/2007 |
| 7239220 | Adjustable delay transmission line A transmission line includes a signal conductor and at least one varactor diode capacitively coupled to the signal conductor. The transmission line's signal path delay is a function of its shunt capacitance, and the varactor's capacitance forms a part of the transmi... | 07/03/2007 |
| 7239218 | Phase shifter having switchable high pass filter and low pass filter paths and impedance adjustment circuits A phase shifter with a low insertion loss in which impedance mismatch at a point in rear of a high-pass filter or a low-pass filter in the signal flow direction is reduced and difference in insertion loss or phase shifting error across a high-pass filter- low-pass f... | 07/03/2007 |
| 7209080 | Multiple-port patch antenna A system and method for combining and radiating electromagnetic energy. The invention includes a novel antenna comprising a first dielectric substrate having opposite first and second surfaces, a patch of conducting material disposed on the first surface, a ground p... | 04/24/2007 |
| 7205866 | Electronic phase reflector with enhanced phase shift performance A varactor based phase shifter that increases phase shift range using an impedance transformer to impart a low characteristic impedance between an input port and a reference node port. The characteristic impedance across the port is therefore less than the character... | 04/17/2007 |
| 7205937 | Non-multiple delay element values for phase shifting Non-multiple delay element values that may be implemented to reduce periodic quantization errors associated with phase shifting devices used in phased array apparatus. The non-multiple delay element values may be implemented so that a magnitude of phase shift impart... | 04/17/2007 |
| 7202747 | Self-tuning variable impedance circuit for impedance matching of power amplifiers A self-tuning variable impedance circuit provides improved performance. A variation in the power applied to the variable impedance circuit causes a corresponding change in the impedance of the circuit, resulting in improved performance. For example, the variable imp... | 04/10/2007 |
| 7187288 | RFID tag reading system and method An embodiment of the present invention provides an RFID tag reading system, comprising an antenna system associated with a portal through which said RFID tag may pass, said antenna system comprising: a plurality of non-uniformly spaced antenna elements arranged subs... | 03/06/2007 |
