Patent application number | Description | Published |
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 |
20120154236 | 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. | 06-21-2012 |
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 |
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 |
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 |