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公开(公告)号：US11909424B2
公开(公告)日：2024-02-20
申请号：US17457519
申请日：2021-12-03
发明人： Stefano Galli , Munawar Kermalli , Xiao-Feng Qi , Shouyuan Shi , Dennis Prather , Janusz Murakowski , Garrett Schneider
CPC分类号： H04B1/0064 , H04B10/40 , H04J14/0205 , H04Q11/0071 , H04B2210/006 , H04Q2011/0088
摘要： In certain embodiments, an apparatus includes a switch matrix and frequency band isolation circuitry. The switch matrix is configured to receive, at an input port, an electrical signal, which corresponds to a transmission signal received at antennas of an antenna array. The transmission signal corresponds to a transmission spatial sector of the array. The electrical signal includes first and second signal portions in first and second frequency bands, respectively, the electrical signal having been generated from an optical signal that corresponds to the transmission signal. The switch matrix is configured to direct, via an output port and in accordance with a control signal, the electrical signal to a first of multiple signal conversion paths.
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公开(公告)号：US10911142B2
公开(公告)日：2021-02-02
申请号：US16284984
申请日：2019-02-25
摘要： An optical imaging system and method that reconstructs RF sources in k-space by utilizing interference amongst modulated optical beams. The system and method involves recording with photodetectors the interference pattern produced by RF-modulated optical beams conveyed by optical fibers having unequal lengths. The photodetectors record the interference, and computational analysis using known tomography reconstruction methods is performed to reconstruct the RF sources in k-space.
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公开(公告)号：US10690850B2
公开(公告)日：2020-06-23
申请号：US16044427
申请日：2018-07-24
发明人： Janusz Murakowski , Timothy Creazzo
摘要： A method and apparatus for simultaneously modulating at least two distinct characteristics of an optical carrier propagating in an optical waveguide with at least two electrical signals includes transmitting an optical beam that includes the optical carrier into an optical waveguide defined in electro-optic material, and applying the at least two electrical signals at the same time to generate an electric field in the optical waveguide. The instantaneous predominant orientation of the electric field in the optical waveguide generated by the applied at least two electrical signals depends on the relative instantaneous values of the applied electrical signals. The at least two distinct characteristics of the optical carrier propagating in the optical waveguide are simultaneously and independently modulated depending on the predominant orientation of the electric field in the optical waveguide as a result of the application of the at least two electrical signals.
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4.发明申请公开(公告)号：US20190319356A1
公开(公告)日：2019-10-17
申请号：US16386196
申请日：2019-04-16
摘要： In the disclosed optically-fed transmitting phased-array architecture, transmitting signals are converted between the electrical domain and the optical domain by using electro-optic (EO) modulators and photodiodes. RF signal(s) generated from a relatively low frequency source modulate an optical carrier signal. This modulated optical signal can be remotely imparted to photodiodes via optical fibers. Desired RF signals may be recovered by photo-mixing at the photodiodes whose wired RF outputs are then transmitted to radiating elements of the antennas. The antenna array may generate a physical RF beam that transmits an RF signal that is focused on one or more selectable locations. Multiple RF beams may be simultaneously generated, each RF beam being capable of being directed to focus on a unique location or set of locations.
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公开(公告)号：US10164712B2
公开(公告)日：2018-12-25
申请号：US15790281
申请日：2017-10-23
IPC分类号： H04B10/00 , H04B10/516 , H04B10/2575 , H04B1/16 , H04B10/11 , H04B10/64 , H01Q3/26
摘要： A method of RF signal processing comprises receiving an incoming RF signal at each of a plurality of antenna elements that are arranged in a first pattern. The received RF signals from each of the plurality of antenna elements are modulated onto an optical carrier to generate a plurality of modulated signals that each have at least one sideband. The modulated signals are directed along a corresponding plurality of optical channels with outputs arranged in a second pattern corresponding to the first pattern. A composite optical signal is formed using light emanating from the outputs of the plurality of optical channels. Non-spatial information contained in at least one of the received RF signals is extracted from the composite signal.
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公开(公告)号：US10158179B2
公开(公告)日：2018-12-18
申请号：US15481382
申请日：2017-04-06
发明人： Janusz Murakowski , Dennis Prather , Peng Yao
摘要： A phased antenna array comprises a plurality of antennas and photodiodes arranged on a substrate. Each antenna is driven by an electrical signal output by the photodiode. The photodiodes each receive an optical signal via an optical fiber. The optical fibers conform to the sheet-like shape of the antenna array (which may be planar or curved) and optically communicate with a corresponding photodiode via a corresponding reflector, such as a ninety degree reflector. The reflectors may comprise a v-groove in a silicon substrate on which the optical fiber is positioned and a reflecting surface. Each reflector may be attached to the substrate or a ground plane positioned parallel to the substrate and the optical fiber may connect to the reflector in a direction running parallel to the phased antenna array. This optical feed network may accommodate tight spacing of the antenna elements (such as spacing less than 5 mm apart) with a thin profile.
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公开(公告)号：US20180309515A1
公开(公告)日：2018-10-25
申请号：US15956545
申请日：2018-04-18
IPC分类号： H04B10/2575 , H04B10/69
CPC分类号： H04B10/2575 , H04B10/00 , H04B10/69 , H04B2210/006
摘要： A system and method reconstructs RF sources in k-space by utilizing interference between RF signals detected by an array of antennas. The system and method may include detecting an RF interference pattern resulting from interference between RF signals in an RF coupler, where the RF signals are detected by the antennas and provided to the RF coupler by RF waveguides. The RF waveguides may have unequal RF path lengths. K-space information of the RF sources may be reconstructed from the detected RF interference pattern using known tomography reconstruction methods.
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公开(公告)号：US20180062752A1
公开(公告)日：2018-03-01
申请号：US15790281
申请日：2017-10-23
IPC分类号： H04B10/516 , H04B10/64 , H04B1/16 , H04B10/11 , H04B10/2575
CPC分类号： H04B10/5165 , H01Q3/2676 , H04B1/16 , H04B10/11 , H04B10/25759 , H04B10/64 , H04B2210/006
摘要： A method of RF signal processing comprises receiving an incoming RF signal at each of a plurality of antenna elements that are arranged in a first pattern. The received RF signals from each of the plurality of antenna elements are modulated onto an optical carrier to generate a plurality of modulated signals that each have at least one sideband. The modulated signals are directed along a corresponding plurality of optical channels with outputs arranged in a second pattern corresponding to the first pattern. A composite optical signal is formed using light emanating from the outputs of the plurality of optical channels. Non-spatial information contained in at least one of the received RF signals is extracted from the composite signal.
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公开(公告)号：US20170328998A1
公开(公告)日：2017-11-16
申请号：US15591771
申请日：2017-05-10
发明人： Janusz Murakowski
摘要： A vehicle such as a helicopter may scan a scene using a transmitter mounted on a rotating part like a rotor and a receiver mounted on a body of the vehicle. Based on a Doppler shift caused by the rotation of the rotating part, patterns may be recorded and used to develop a holographic image of the scene.
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10.发明授权公开(公告)号：US09544510B2
公开(公告)日：2017-01-10
申请号：US14150213
申请日：2014-01-08
发明人： Janusz Murakowski , Garrett Schneider , Shouyuan Shi , Christopher A. Schuetz , Dennis W. Prather
摘要： An apparatus and method may be used to create images, e.g., three-dimensional images, based on received radio-frequency (RF), e.g., millimeter wave, signals carrying image data. The RF signals may be modulated onto optical carrier signals, and the resulting modulated optical signals may be cross-correlated. The resulting cross-correlations may be used to extract image data that may be used to generate three-dimensional images.
摘要翻译： 基于接收的射频（RF），例如毫米波，携带图像数据的信号，可以使用装置和方法来创建图像，例如三维图像。 RF信号可以被调制到光载波信号上，并且所得到的调制光信号可以是交叉相关的。 所得的交叉相关可以用于提取可用于生成三维图像的图像数据。
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