Patent application number | Description | Published |
20090195454 | Soldier/ground vehicle passive ranging system utilizing compact spatiotemporal processor - A method of two-source passive ranging comprising the steps of determining the coordinates of a first position and a second position wherein a first soldier or ground vehicle is located at the first position and a second soldier or ground vehicle is located at the second position; determining individual angles between said first and second positions and a radio frequency source; and using individual single-angle accuracy values to estimate the range from the first and second positions to the radio frequency source. | 08-06-2009 |
20090284351 | DISPERSIVE ANTENNA FOR RFID TAGS - RFID tag designs and sensors are disclosed that include a dispersive antenna and exhibit greater detection ranges relative to conventional designs. The designs include, for example a transponder having including a rectifier, a radio-frequency identification (RFID) circuit for receiving and responding to interrogation signals, and a frequency dispersion element for receiving a multi-phase input signal and creating a pulse therefrom for input to the rectifier. Frequency-dispersive elements (e.g., antennas) and compatible interrogation waveforms can be used so that the rectifying diodes receive high peak voltage levels relative to the average voltage levels. | 11-19-2009 |
20100283699 | BROADBAND WHIP ANTENNA - A shortened multi-band antenna includes in-line dipoles, selected elements of which having shielded meanderline chokes to be able to switch from an extended dipole at the lower VHF frequencies to a shortened dipole for the UHF band. Additionally, the staggered asymmetric meanderline configuration permits overall size reduction, whereas antenna construction includes an intermediate fiberglass layer over which conductive foil is placed for tuning and for parasitic radiator purposes to improve the gain of the UHF dipole in the upper regions of the band at 450 megahertz. Additionally, at the low end of the 30 megahertz band a sleeve is positioned between the base of the lowest dipole element and ground, with the sleeve provided with two parallel RLC circuits tuned to different bands to improve VSWR at the low end of the VHF band and to eliminate unwanted nulls. | 11-11-2010 |
20110128149 | METHOD AND APPARATUS FOR DETECTING COMMAND WIRE UTILIZED TO DETONATE AN IMPROVISED EXPLOSIVE DEVICE (IED) - A method and apparatus is devised for detecting command wires utilized to detonate an improvised explosive device or other objects of interest in which frequency-scanned RF in the HF region of the electromagnetic spectrum is projected out across a given area and returns are detected and converted into image data in which phase, amplitude, range and frequency associated with the incoming data is correlated with frequency-dependent range templates to determine the existence of, the range of and the direction of command wires or other objects of interest. | 06-02-2011 |
20110128179 | SCANNING NEAR FIELD ELECTROMAGNETIC PROBE - A method and apparatus is devised for detecting objects of interest in which frequency-scanned RF in the HF region of the electromagnetic spectrum is projected out across a given area and returns are detected and converted into image data in which phase, amplitude, range and frequency associated with the incoming data is correlated with frequency-dependent range templates to determine the existence of, the range of and the direction of the objects of interest. | 06-02-2011 |
20110183622 | CHIRP FOURIER TRANSFORM METHOD AND APPARATUS FOR CANCELING WIDE BAND INTERFERENCE - A wide band frequency domain canceller is used in cosite mitigation interference in which a signal tapped from a transmit antenna is coupled to a Chirp Fourier Transform to covert the signal into the frequency domain. The frequency domain signal is vector multiplied with a path transform function to add the path transfer function values to the sampled signal, after which the processed frequency domain signal is converted back into the time domain by an Inverse Chirp Fourier Transform, after which it is inverted and coupled into the receive path of a cosited receiver. | 07-28-2011 |
20110187363 | METHOD AND APPARATUS FOR SENSING THE PRESENCE OF EXPLOSIVES, CONTRABAND AND OTHER MOLECULES USING NUCLEAR QUADRUPOLE RESONANCE - Stimulated emissions due to nuclear quadropole resonance are detected utilizing a terminated balanced transmission line and a directional coupler for the detection of explosives, contraband, narcotics and the like that exist between the transmission lines, with either a stepped frequency generator utilized to scan between 100 KHz and 10 MHz, or wherein parallel fixed frequency sources are coupled to the transmission line, thereby to permit correlation with expected lines, with the frequency sources being low power so as to not create a safety hazard and so as not to interfere with radiation sensitive devices such as film or electronic circuits that are in the vicinity of the balanced transmission line. | 08-04-2011 |
20120136585 | METHOD AND SYSTEM FOR THE DETECTION AND IDENTIFICATION OF EXPLOSIVES AND/OR CONTRABAND - A nuclear quadrupole resonance system which senses the stimulated emission from target molecules includes in a calibration step and a stimulated emission response detection step, with the system employing clutter cancellation involving linear regression and the use of cross correlation with a series of known molecular signatures, both increasing the signal-to-noise ratio of the system. | 05-31-2012 |
20120139536 | SHIPPING CONTAINER EXPLOSIVES AND CONTRABAND DETECTION SYSTEM USING NUCLEAR QUADRUPOLE RESONANCE - For container-carried explosives or contraband, stimulated emissions due to nuclear quadropole resonance are detected utilizing a terminated balanced transmission line and a directional coupler for the detection of explosives, contraband, narcotics and the like that exist in metal containers. | 06-07-2012 |
20120161761 | TRANSMISSION LINE ARRAY FOR EXPLOSIVE DETECTION USING NUCLEAR QUADRUPOLE RESONANCE - A transmission line array is used for explosive/contraband detection using nuclear quadrupole resonance in which the array is driven in-phase with synchrony frequency-swept signals. Each of the balanced transmission lines is fed with a low power swept frequency source and stimulated emissions are picked out with a directional coupler. Location is provided using a cross grid array or a phase detector is used for each balanced line, with phase determining the distance to the sensed substance. | 06-28-2012 |
20120161762 | LONG RANGE DETECTION OF EXPLOSIVES OR CONTRABAND USING NUCLEAR QUADRUPOLE RESONANCE - Nuclear quadrupole resonance substance detection at a distance is provided by crossed or overlapping high frequency beams in which the frequency of one of the beams is offset with respect to the frequency of the other beam by an amount equal to the resonant frequency of the non-linear material to be detected. The presence of energy at the offset frequency within the overlapping beams pumps any non-linear material within the overlapping beams to cause stimulated emission which is detected, in one embodiment, utilizing a network analyzer, along with correlation of the detected stimulated emission signature with a library of signatures for predetermined substances. | 06-28-2012 |
20120161771 | LONG DISTANCE EXPLOSIVE DETECTION USING NUCLEAR QUADRUPOLE RESONANCE AND ONE OR MORE MONOPOLES - Rather than using balanced transmission lines the stimulated response due to nuclear quadrupole resonance can be detected using a single monopole, with multiple monopoles improving substance detection. | 06-28-2012 |
20120204937 | LEAKY SOLAR ARRAY WITH SPATIALLY SEPARATED COLLECTORS - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120204954 | QUADRATIC PHASE WEIGHED SOLAR RECEIVER - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120204955 | LEAKY MODE SOLAR RECEIVER USING CONTINUOUS WEDGE LENS - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120204956 | CORRECTION WEDGE FOR LEAKY SOLAR ARRAY - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120205525 | LEAKY WAVE MODE SOLAR RECEIVER - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120206141 | METHOD AND APPARATUS FOR SENSING THE PRESENCE OF EXPLOSIVES, CONTRABAND AND OTHER MOLECULES USING NUCLEAR QUADRUPOLE RESONANCE AND A SWEPT FREQUENCY CONTINUOUS WAVE SOURCE - Stimulated emissions due to nuclear quadropole resonance are detected utilizing a terminated balanced transmission line and a directional coupler for the detection of explosives, contraband, narcotics and the like that exist between the transmission lines, in which a swept frequency continuous wave generator is utilized to scan between 100 KHz and 10 MHz. | 08-16-2012 |
20120206310 | HIGH PERFORMANCE LOW PROFILE ANTENNAS - A leaky travelling wave array of elements provide a radio frequency antenna. | 08-16-2012 |
20120206787 | SOLAR ARRAY WITH MULTIPLE SUBSTRATE LAYERS PROVIDING FREQUENCY SELECTIVE SURFACES - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120206807 | ORTHOGONAL SCATTERING FEATURES FOR SOLAR ARRAY - A leaky travelling wave array of optical elements provide a solar wavelength rectenna. | 08-16-2012 |
20120274528 | HIGH PERFORMANCE LOW PROFILE ANTENNAS - A leaky travelling wave array of elements provide a broadband radio frequency antenna. | 11-01-2012 |
20120293380 | WIDE BAND EMBEDDED ARMOR ANTENNA - An extremely thin embedded antenna for an armor-carrying vehicle utilizes a dipole driven element to the inside of the armor plate and a parasitically-driven dipole element on top of the armor plate, with the parasitic element providing appropriate forward gain and antenna matching characteristics such that there need be no aperturing of the armor plate in order to feed the antenna. In one embodiment, the bowtie antenna elements are elongated, extended or expanded by outboard antenna sections which are spaced from the distal ends of the corresponding bowties, with a meanderline choke bridging the gap between a bowtie element and its extended portion. | 11-22-2012 |
20120293381 | WIDE BAND EMBEDDED ARMOR ANTENNA - An extremely thin embedded antenna for an armor-carrying vehicle utilizes a dipole driven element to the inside of the armor plate and a parasitically-driven dipole element on top of the armor plate, with the parasitic element providing appropriate forward gain and antenna matching characteristics such that there need be no aperturing of the armor plate in order to feed the antenna. In one embodiment, the bowtie antenna elements are elongated, extended or expanded by outboard antenna sections which are spaced from the distal ends of the corresponding bowties, with a meanderline choke bridging the gap between a bowtie element and its extended portion. | 11-22-2012 |
20130009832 | DUAL UHF DIPOLE QUADRAFILER HELIX ANTENNA - A dual purpose antenna is provided with the UHF antenna in the form of a pair of copper tubes to provide an off center fed dipole, with a pair of quadrafiler helix L1 and L2 GPS antennas stacked on top of the UHF antenna, and with the top section of the UHF dipole providing a ground plain for the GPS antenna. The antennas are fed internally by two coaxial feeds, one feeding the UHF antenna, the other passing through the UHF antenna to feed the GPS antennas. In one embodiment, a tuning coil is provided at the base of the UHF antenna by the coiling of the two coaxial feeds around a non-conductive mandrel, with copper taping placed on top of the coiled coaxial sections to provide an LC circuit to lower the resonant frequency of the UHF antenna to 225 MHz. | 01-10-2013 |
20130021112 | METHOD AND APPARATUS FOR AVOIDING PATTERN BLOCKAGE DUE TO SCATTER - A method and apparatus is provided for avoiding pattern blockage due to scatter from an object in which an artificial surface directs the energy from the antenna prior to arriving at a blocking structure such that either the wave fronts of the energy are linear when they arrive at the blocking structure or the phase of the energy incident on the object is adjusted such that the energy reflected from the object is in phase with energy directly from the antenna radiating elsewhere in the far field pattern, or both. | 01-24-2013 |
20130116932 | USING PHASE MATCHED FILTERS FOR NQR DETECTION OF CONTINUOUS RABI TRANSITIONS - Nuclear quadrupole resonance measurement using two or more wire loop(s) within a space to define a portal, and driving the wire loop(s) with a baseband digital transmitter generating a chirped or stepped signal, to create a corresponding varying electromagnetic field within the portal. Coherent emissions reflected thereby are detected through a directional coupler feeding the transceiver. The detected coherent emissions are processed with a matched filter to determine presence of a target object within the portal. | 05-09-2013 |
20130187726 | TUNABLE VARIABLE IMPEDANCE TRANSMISSION LINE - A low profile antenna using a cavity-backed central radiating surface surrounded by one or more ground plane surfaces. Passively reconfigurable structure provide frequency dependent coupling between the surfaces. The frequency dependent couplings may be implemented using meander line structures, Variable Impedance Transmission Lines (VITLs), or tunable VITLs that used interspersed electroactive sections. | 07-25-2013 |
20130222199 | STACKED BOW TIE ARRAY WITH REFLECTOR - A stacked bow tie antenna array structure is placed within, for example a rectangular reflector. Spaces between the bow tie elements and the reflector are filled with close spaced conductive plates. | 08-29-2013 |
20130266319 | Photonic Antenna - A photonic antenna uses a traveling wave fed, surface wave excited, dielectric waveguide. One or more antenna elements are arranged in a line or other array. An optical interconnect is provide by depositing the waveguide structure on the system of antenna elements, and the photodiode detectors on the waveguide, or wafer bonded to the waveguide core. Optical sources are butt coupled to the edge of the waveguide via wafer bonding or as part of a deposition process. The device acts as a free-space optical transceiver embodied in an integrated photonic antenna and waveguide structure, and provides high speed, spectrally broadband response; it also inherently includes an open architecture for implementing Wavelength Division Multiplexing (WDM). | 10-10-2013 |
20130300412 | ARRANGEMENT FOR MULTIPLE FREQUENCY, MULTIPLE PORTAL NQR DETECTION - Nuclear quadrupole resonance measurement using two or more wire loop(s) within a space to define a portal, and driving the wire loop(s) with a baseband digital transmitter generating a chirped or stepped signal, to create a corresponding varying electromagnetic field within the portal. Coherent emissions reflected thereby are detected through a directional coupler feeding the transceiver. The detected coherent emissions are processed with a matched filter to determine presence of a target object within the portal. | 11-14-2013 |
20140152486 | NEAR FIELD SUBWAVELENGTH FOCUSING SYNTHETIC APERTURE RADAR WITH CHEMICAL DETECTION MODE - Detection of objects such as a buried explosive device while operating from a moving platform using a radio frequency emission system having two modes. An electromagnetic wave emission and detection system operates in a first mode to locate objects of interest and in a second mode to determine if an object contains explosive materials. In the first mode, the emission and detection system preferably operates as a subwavelength focusing, wideband, superlens using a near field super gain synthetic aperture continuous wave (CW) swept radar. In the second mode the system preferably enabled after detection of an object in the first mode, uses chemical detection methods such as Nuclear Quadrupole Resonance (NQR). | 06-05-2014 |
20140159975 | WIDEBAND COMPACT DIPOLE MANPACK ANTENNA - An compact manpack format antenna operating over a broad bandwidth. In one arrangement, the antenna is formed from a set of five hollow cylindrical conductive elements. Several cylinders provide, for example, a VHF/UHF radiator section and other cylinders form an L-band radiator section. A bottom leg of the L-band section operates as part of the VHF/UHF section via coupling between that lower L-band leg and the VHF/UHF section. This coupling arrangement reduces the required overall physical length of the antenna. | 06-12-2014 |
20140167195 | OPTIMIZING GEOMETRIC FILL FACTOR IN PRISM-COUPLED WAVEGUIDE-FED SOLAR COLLECTOR - A prism coupled waveguide-fed solar collector array optimized for geometric fill factor. An integrated linear array of prisms is arranged with their input faces in a common plane. The exit faces of the prisms each feds a corresponding optical waveguide and detector. | 06-19-2014 |
20140176385 | COMPACT CYLINDRICALLY SYMMETRIC UHF SATCOM ANTENNA - A cylindrically symmetric satellite antenna that provides directional and omnidirectional operating modes in a compact form factor. Feed points located at the top of the cylindrical structure provide increased platform isolation. Combining networks, disposed below or within the cylindrical structure, may be replaced with inexpensive baluns composed of coaxial line sections. | 06-26-2014 |
20140182656 | WIDEBAND LIGHT ENERGY WAVEGUIDE AND DETECTOR - An electromagnetic energy concentrator uses a prism and waveguide with a gap layer of uniform thickness disposed between the prism and a first surface of waveguide. Energy detectors, which may be photovoltaics or miniaturized antenna elements are disposed adjacent to and co-extensive with a second surface of the waveguide. The detectors operate in each of at least two bands; a distance between detectors operating in a given band depends on a wavelength in the given band. | 07-03-2014 |
20140210464 | NQR DETECTION FROM CONTINUOUS RABI TRANSITIONS - Nuclear quadrupole resonance measurement using two or more wire loop(s) within a space to define a portal, and driving the wire loop(s) with a baseband digital transmitter generating a chirped or stepped signal, to create a corresponding varying electromagnetic field within the portal. Coherent emissions reflected thereby are detected through a directional coupler feeding the transceiver. The detected coherent emissions are processed with a matched filter to determine presence of a target object within the portal. | 07-31-2014 |
20140266209 | DETECTION PROCESSING FOR NQR SYSTEM - A system that uses the nuclear quadrupole resonant effect to detect the presence of materials of interest, such as may be excited by radio frequency fields generated within a portal. Transmitted chirp signals may be processed using matching filtering and other signal processing to accurately detect the presence of such materials. | 09-18-2014 |
20140266503 | SPIRAL SURFACE ELECTROMAGNETIC WAVE DISPERSIVE DELAY LINE - Dispersive properties of a linear dispersive delay line are retained in a spiral configuration by constraining the radius of curvature depending on a desired propagation mode. The compact form factor spiral can be either a continuous spiral or a piecewise linear approximation. The spiral comprises a highly dielectric waveguide such as titanium dioxide or barium tetratitanate. Preferably, a spacer with a low dielectric constant and a microstrip are disposed on the top surface. The microstrip prevents attenuation of low frequencies, thereby increasing the operating frequency range. A second dielectric spacer and a second microstrip can be deposited on the bottom surface of the waveguide. Alternatively, the bottom surface of the waveguide can face a ground plane. The waveguide can be fed by horns or half-horns. | 09-18-2014 |
20140310804 | FINGERPRINT BASED SMARTPHONE USER VERIFICATION - A touch screen, now incorporated in most smart phones, presents an effective and transparent method to incorporate continuous active user verification schemes. The projected capacitive grid structure can be used to capture enough information to verify that a valid user currently has possession of the mobile device, even while the user is not consciously engaged in an active verification interface. Further processing, such as habitual gesture recognition, can augment the process. | 10-16-2014 |
20140327488 | MULTIBAND WHIP ANTENNA - A multi-band whip antenna having a 30 MHz to 2 GHz bandwidth and an L-band dipole has its coverage extended up to 6 GHz by eliminating nulls and reducing VSWR problems that are cured through the utilization of a sleeve over the feedpoint of the L-band antenna. Chokes in the form of sleeves are provided at either end of the L-band dipole to shorten the L-band antenna for preventing reverse polarity currents at the L-band antenna feedpoint, with the antenna further including the use of double shielded meanderlines to provide improved performance between 410-512 MHz and in which a capacitance sleeve is added at the bottom of the L-band antenna to effectively elongate the antenna below the L-band to permit operation below 700 MHz. | 11-06-2014 |
20140333302 | LOW POWER STIMULATED EMISSION NUCLEAR QUADRUPOLE RESONANCE DETECTION AT MULTIPLE REFERENCE POWER LEVELS - System and methods for detecting substances such as explosives via the nuclear quadrapole resonance effect. We observe that the nuclear quadrupole resonances of explosives located within a cavity portal involve continuous Rabi transitions which are nonlinear processes since stimulated emission occurs. In other words, where there are no resonances caused by the presence of an explosive, high average power and low average power measurements should be identical. However, when resonances are stimulated by the system, the difference between these two conditions can be compared to determine a correction to measurements made when a person located in the cavity has explosive material on their person, without the need for separate empty portal or elaborate calibration procedures. | 11-13-2014 |
20150054511 | NUCLEAR QUADRUPOLE RESONANCE SYSTEM - A Nuclear Quadrupole Resonance detection system with features that include:
| 02-26-2015 |