| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | Fiber structure and method for obtaining tuned response to high frequency electromagnetic radiation | US859291 | 1986-05-05 | US4728554A | 1988-03-01 | Harris A. Goldberg; Y. M. Faruq Marikar |
| The present invention relates to fiber structures and methods for obtaining tuned response to high frequency electromagnetic radiation, particularly at microwave frequencies. In one embodiment, a woven fabric is prepared with ferrite filled fibers oriented perpendicular to dielectric filled fibers. The fill of the fibers is selected to reflect radiation having a known frequency and polarization. In other embodiments, tuned structures are provided by disposing sheets containing oriented ferrite and dielectric fibers parallel to one another and moving the layers relative to one another to achieve the desired impedance for incident radiation. | ||||||
| 162 | High magnetic permeability composites containing fibers with ferrite fill | US859292 | 1986-05-05 | US4725490A | 1988-02-16 | Harris A. Goldberg |
| High magnetic permeability composites are obtained by incorporating ferrite fibers in the composites. The ferrite fibers consist of a polymer and particulate ferrite fill at a concentration above the percolation threshold for the ferrite fill in the polymer (typically greater than 30 volume percent). The aspect ratio and ferrite concentration of the fibers are selected to minimize demagnetization fields in the fibers. The fibers can be dispersed in low concentration in an unoriented fashion in the composites to impart high magnetic permeability to the composite. In other embodiments, the fibers are oriented in the composites to impart high magnetic permeability to the composite for incident radiation of a particular linear polarization. | ||||||
| 163 | Modulation systems | US172054 | 1962-02-02 | US4394628A | 1983-07-19 | Donald S. Banks |
| 1. Apparatus for deviating the frequency of a carrier signal in accordance with the frequency deviations of an intermediate frequency signal comprising:modulator means for varying the frequency of said carrier signal in accordance with a modulating signal;first mixer means for providing sum and difference frequency signals of the product of the modulated carrier signal and the frequency deviating intermediate frequency signal;filter means coupled to said mixer means and resonant at a predetermined one of said sum and difference frequency signals for providing a carrier control signal having a phase error component proportional to the deviation of said predetermined one of said sum and difference signals from its predetermined value;second mixer means for mixing said carrier control signal with said modulated carrier signal to produce an intermediate frequency control signal having a phase error component proportional to the deviation of said predetermined one of said sum and difference signals from its predetermined value; andmeans for comparing said intermediate frequency control signal with said frequency deviating intermediate frequency signal to provide said modulating signal. | ||||||
| 164 | Light-sensitive gunn-effect device | US3651426D | 1970-06-24 | US3651426A | 1972-03-21 | BOATNER LYNN A; SEWELL KENNETH G |
| Disclosed is a Gunn-effect device comprising, for example, a crystal of n-type gallium arsenide having alloyed contacts (e.g., indium and gold) which is switched from one frequency of oscillation to another by controlling the incident light while maintaining an appropriate temperature and bias voltage. It is believed that trap zones which are localized within the crystal by virtue of introducing acceptor impurities account for a frequency of oscillation different from the usual transit-time frequency. The Gunn domains and the incident light are made to dynamically perturb the trap system so as to achieve a nonequilibrium condition.
|
||||||
| 165 | Electro-optic phase modulator with no residual amplitude modulation | US15249182 | 2016-08-26 | US09912413B1 | 2018-03-06 | Nicolas Dupuis; Benjamin G. Lee; Marc A. Taubenblatt |
| An optical phase modulator includes an input source that is configured to receive a light source. There is an output operative to provide a phase modulated output signal based on the received light source. There is a first optical coupler configured to split the light source into a first optical path of a Mach Zehnder Interferometer (MZI) and a second optical path of the MZI. A static phase shifter is configured to provide a static phase shift to the first optical path. There is a phase modulator in the second optical path. There is a second optical coupler configured to combine the first optical path and the second optical path. The first and second optical couplers are tuned such that the phase modulated optical signal at the output provides a substantially constant amplitude that is independent of a change in loss introduced by the phase modulator. | ||||||
| 166 | ELECTRO-OPTIC PHASE MODULATOR WITH NO RESIDUAL AMPLITUDE MODULATION | US15249182 | 2016-08-26 | US20180062754A1 | 2018-03-01 | Nicolas Dupuis; Benjamin G. Lee; Marc A. Taubenblatt |
| An optical phase modulator includes an input source that is configured to receive a light source. There is an output operative to provide a phase modulated output signal based on the received light source. There is a first optical coupler configured to split the light source into a first optical path of a Mach Zehnder Interferometer (MZI) and a second optical path of the MZI. A static phase shifter is configured to provide a static phase shift to the first optical path. There is a phase modulator in the second optical path. There is a second optical coupler configured to combine the first optical path and the second optical path. The first and second optical couplers are tuned such that the phase modulated optical signal at the output provides a substantially constant amplitude that is independent of a change in loss introduced by the phase modulator. | ||||||
| 167 | Electromagnetic wave generation device and detection device | US14155033 | 2014-01-14 | US09236833B2 | 2016-01-12 | Toshihiko Ouchi; Ryota Sekiguchi |
| The invention provides an electromagnetic wave generation device. The device includes a substrate provided with a terahertz wave oscillation section including a resonant tunneling diode structure, a two-dimensional electron layer having a semiconductor heterojunction structure, and a transistor section including a source electrode and a drain electrode provided at end portions of the two-dimensional electron layer and a gate electrode provided above the two-dimensional electron layer. The terahertz wave output of the terahertz wave oscillation section changes distribution of electrons in the two-dimensional electron layer. | ||||||
| 168 | Terahertz wave modulator based on hole-injection and -transfer | US14005401 | 2011-12-12 | US09231226B2 | 2016-01-05 | Chul-Sik Kee; Joong-Wook Lee; Chul Kang; Kiejin Lee; Hyung Keun Yoo |
| The present invention relates to a terahertz wave modulator. The terahertz wave modulator includes: a semiconductor substrate; a terahertz modulation layer including an organic-material layer disposed on the semiconductor substrate; and a first incident wave radiation unit for vertically radiating a first incident wave having a terahertz wave region onto the terahertz modulation layer. The transmitted terahertz wave may be variously modified according to the degree of crystallization of an organic material deposited on the semiconductor substrate and according to the intensity of incident light so as to maximize modulation efficiency using the modified terahertz wave. Thus, a device for modulating wavelength width, amplitude, and phase through waveform deformation in a time region may be provided. Furthermore, by bonding together a plasmons or metamaterials having similar surfaces, a highly functional terahertz wave modulation device may be provided, wherein said device may be widely used for optical purposes. | ||||||
| 169 | Communication system and control circuit therein | US13604667 | 2012-09-06 | US08903018B2 | 2014-12-02 | Yin-Tsai Wang |
| A communication system includes a baseband processor, an RF (Radio Frequency) transceiver, a power amplifier, an antenna, and a control circuit. The power amplifier generates an amplified signal. The control circuit includes a coupler, an AC-to-DC (Alternating Current to Direct Current) converter, a comparator, and an attenuator. The coupler generates a transmission signal and a coupling signal according to the amplified signal. The AC-to-DC converter is coupled to the coupler, and converts the coupling signal into a DC (Direct Current) signal. The comparator compares a DC voltage of the DC signal with a reference voltage so as to generate a control signal. The attenuator is coupled between the coupler and the antenna, and attenuates or does not attenuate the transmission signal according to the control signal. | ||||||
| 170 | Methods and apparatus for terahertz wave amplitude modulation | US13529934 | 2012-06-21 | US08836446B2 | 2014-09-16 | Berardi Sensale-Rodriguez; Huili (Grace) Xing; Rusen Yan; Michelle M. Kelly; Tian Fang; Debdeep Jena; Lei Liu |
| A wave amplitude modulator for modulating a transmitted electromagnetic wave includes one or multiple self-gated capacitively coupled pair(s) of electron layers such as semiconductor or semimetal layers. Two electrical contacts are placed to each layer of electrons of the self-gated pair(s), and a power source is electrically connected to them. The power source, by varying the voltage applied between layers of electrons, tunes the electron density thereof, thereby adjusting the optical conductivity thereof, and the change in the optical conductivity of the layers of electrons causes an amplitude modulation of the transmitted electromagnetic wave passing through the capacitively coupled layers of electrons. | ||||||
| 171 | Multi-mode optoelectronic oscillator | US13617144 | 2012-09-14 | US08824901B2 | 2014-09-02 | Preetpaul S Devgan; Vincent J Urick; Keith J Williams |
| A multi-mode optoelectronic oscillator (MM-OEO) includes an OEO cavity having an input for receiving an RF signal and an RF output. The OEO cavity includes a) a first laser having a first laser output, a second laser having a second laser output, b) a modulator having i) a first input coupled to the first laser output, ii) a second input coupled to the second laser output, iii) a third input, iv) a first modulator output, and v) a second modulator output, c) a semiconductor optical amplifier (SOA) having an input coupled to the first modulator output and having an SOA amplified output, d) a photodetector coupled to the SOA amplified output and having an output, and e) a coupler having an input coupled to the photodetector output and having a first output coupled to the third modulator input and a second output, whereby an amplified RF signal is produced at the OEO RF output. | ||||||
| 172 | Structured random permutation pulse compression systems and methods | US13657736 | 2012-10-22 | US08747321B2 | 2014-06-10 | Pat Sankar |
| A structured randomly permutated pulse compression system comprises an FM transmitter configured to receive an input signal and transmit an output signal. The FM transmitter is configured to modulate the frequency of the output signal by modulating the frequency of the output signal according to a structured random permutation of time samples of the input signal. At least one antenna interfaces with the FM transmitter. The FM receiver is configured to auto-correlate the output signal with a return signal. | ||||||
| 173 | Communication channel optimization systems and methods in multi-user communication systems | US10792127 | 2004-03-04 | US08705659B2 | 2014-04-22 | Wen Tong; Ming Jia; Peiying Zhu; Alexandre M. Chloma; Mikhail G. Bakouline; Vitali B. Kreindeline |
| Systems and methods of optimizing communication channels in multi-user communication systems are provided. Coding weights are determined based on communication channel state information for communication channels between a transmitter and multiple receivers. The coding weights are applied to communication signals to be transmitted from the transmitter to the receivers. Each receiver decodes received signals using inverses of the coding weights. Embodiments of the invention support multi-user MIMO (Multiple Input Multiple Output) where each receiver has fewer antennas than the transmitter, and enhance system performance if the total number of antennas at all of the receivers exceeds the number of antennas at the transmitter. | ||||||
| 174 | Method and system for increasing throughput of a wireless channel using multipath transmission | US10230864 | 2002-08-28 | US08451934B1 | 2013-05-28 | Clifford Kraft; Vasilios D. Dossas |
| A method and system for increasing the throughput of a wireless channel that sends different data on different multi-path components. The channel can be pre-mapped or dynamically mapped, and the different transmissions can be modulated by different complexity signals such as adaptive quadrature amplitude modulation (AQAM). Each multipath component is coded with a signature that will allow it to be separated at a receiver that has an omni-directional antenna. Common signature techniques can be offset PN codes, orthogonal spreading vectors, orthogonal alphabets and other signature techniques. The received channels can be combined for an overall increase in data-rate or used separate as multiplexed data. | ||||||
| 175 | Wireless data transmission between base station and transponder with transmission parameter adjusted based on transponder operating information | US10896674 | 2004-07-21 | US07986653B2 | 2011-07-26 | Ulrich Friedrich |
| Data encoded in packets modulated onto a carrier wave is transmitted between a base station and a transponder. Each packet includes a header section that contains at least a reference symbol and that serves for adjusting one or more transmission parameters, and a further section such as a data section. The transponder transmits data back to the base station through modulation and backscattering of the carrier wave. During the transmission of the header section by the base station, the transponder transmits transponder operating information relating to the processing of data to be received and/or transmitted by the transponder, by corresponding modulation and backscattering of the carrier wave. In response to and dependent on the received transponder operating information, the base station adjusts at least one transmission parameter, whereby the highest data transmission rate within the capabilities of the particular transponder can be achieved. | ||||||
| 176 | Mobile communication device | US11797587 | 2007-05-04 | US20070263750A1 | 2007-11-15 | Shih-Chieh Ou; Hung-Rung Chung |
| A mobile communication device including a connector, a judging circuit, a first transmission circuit, a second transmission circuit, a data processing module and an audio processing module is provided. The first end of the connector is for receiving and transmitting a data signal of the data processing module or an audio signal of the data processing module. The second end of the connector is for receiving and transmitting the data signal of the data processing module or the audio signal of the data processing module. The judging circuit is coupled to the first end of a connector and outputs a first indicative signal to determine the type of the plug connected to the connector. | ||||||
| 177 | Methods for making microwave circuits | US11113753 | 2005-04-25 | US20050191412A1 | 2005-09-01 | John Casey; Lewis Dove; Ling Liu; James Drehle; R. Rau; Rosemary Johnson; Julius Botka |
| In a method for making a microwave circuit, a first dielectric is deposited over a ground plane, and then a conductor is formed on the first dielectric. A second dielectric is then deposited over the conductor and first dielectric, thereby encapsulating the conductor between the first and second dielectrics. In one embodiment, a ground shield layer is formed over the first and second dielectrics by 1) precoating the first and second dielectrics with a metallo-organic layer, and then 2) depositing a thickfilm ground shield layer over the precoat layer. Alternately, a ground shield layer is formed over the first and second dielectrics by 1) placing a polymer screen over the first and second dielectrics, and applying pressure to the polymer screen until it at least partially conforms to a contour of the dielectrics, and then 2) printing a thickfilm ground shield layer through the polymer screen. | ||||||
| 178 | Method and apparatus for multiplexing complete MPEG transport streams from multiple sources using a PLL coupled to both the PCR and the transport encoder clock | US864324 | 1997-05-28 | US5936968A | 1999-08-10 | Paul W. Lyons |
| A method and apparatus for splicing transport streams from multiple sources without violating the clock slew rates specified for a receiver. The method employs a digital phase lock loop (PLL) to lock both the transport output clock of the digital studio and the transmission symbol clock to a stable reference clock of 27 MHz. | ||||||
| 179 | Pulsewidth-modulated amplifier having analog mode | US85900 | 1993-07-06 | US5382915A | 1995-01-17 | David L. Muri; Robert E. Stengel |
| An audio amplifier (100) switches between a pulsewidth-modulated (PWM) mode to an analog mode when required in order to reduce unwanted EMI when the signals being reproduced fall within a predetermined threshold range such as when reproducing low amplitude signals. Amplifier (100) includes both a pulsewidth-modulator (114) and a low-level analog amplifier (126) coupled to a speaker bridge circuit. When controller (106) determines that the input signal (102) is at a predetermined level, controller (106) selectively applies to the load (164) an analog signal instead of the PWM signal, this provides for improved dynamic range and reduced amplifier produced EMI. | ||||||
| 180 | Equalizer for radio receive signal | US724612 | 1991-07-02 | US5297165A | 1994-03-22 | Takashi Ueda; Hiroshi Suzuki; Hitoshi Yoshino |
| In a transversal type equalizer having a series connected delay elements, multipliers are coupled with each output of each delay element and an adder adds outputs of the multipliers to provide an equalized output signal for equalizing a time division radio receive signal for every burst in mobile communication. A receive memory (11) stores the receive signal. A transversal type equalization process circuit (77a) is coupled with the output of the memory (11). A output memory (100) stores on equalized output signal. In training tap coefficients of a transversal filter, a tap or a delay element is precluded when an absolute value of a tap coefficient is less than a predetermined value, so that calculation amount for updating tap coefficients is decreased and tracking characteristics are improved. A multiplier (15) is inserted between an output of the receive memory (11) and an input of the equalization process circuit (77a) so that a signal which is subject to equalization is phase-shifted beforehand so that frequency offset between transmit frequency in a transmitter and local frequency in a receiver is compensated. The phase adjustment by the multiplier (15) depends upon residual phase error at an output of the equalization process circuit (77a). An output memory (100) is used as a training signal to initialize the tap coefficients of the equalization process circuit (77a) during a burst when equalized output signal has an error larger than a predetermined value. | ||||||
QQ群二维码
意见反馈
意见反馈