Matches 251 - 300 out of 566 < 1 2 3 4 5 6 7 8 9 10 11 12 >
Match Document Document Title
6008771 Antenna with nonradiative dielectric waveguide  
An antenna includes a cylindrically shaped dielectric resonator placed on a longitudinally extended axis of an elongated dielectric strip disposed on a planar conductor and another planar conductor...
5990850 Metallodielectric photonic crystal  
A metallodielectric photonic crystal including a plurality of elements, each having a non-dielectric component, arranged with respect to each other in a three-dimensionally periodic lattice. The...
5982339 Antenna system utilizing a frequency selective surface  
An antenna element is provided that includes a frequency selective surface (FSS) portion on its primary radiating/receiving surface. The antenna element is conductively or capacitively coupled to...
5973649 Common aperture dual mode semi-active laser/millimeter wave sensor  
A common aperture, dual mode semi-active laser (SAL) and millimeter wave (MMW) sensor having transreflector configured to allow transmission of SAL energy therethrough, a separator and a fresnel...
5958557 Radome panel  
A contoured panel section for a radome for use with a center frequency corresponding to a wavelength equal to λ, the panel section comprising a solid body portion of a thickness which is an...
5959588 Dual polarized selective elements for beamwidth control  
A dual polarized antenna comprises at least one radiating element and a ground plane. The ground plane is, at least partly, provided with a side wall. At least one polarization selective element is...
5949387 Frequency selective surface (FSS) filter for an antenna  
A frequency selective surface filter (20 or 50) particularly useful in connection with a transmit antenna (10) for passing and rejecting signals in multiple frequency bands. According to one...
5948718 Dielectric ceramic polarizer  
A dielectric ceramic substrate or block contains, at least, two kinds of metal ions, and a dielectric constant in the substrate or block changes continuously or step by step as a function of...
5929819 Flat antenna for satellite communication  
A low profile receiving and/or transmitting antenna includes an array of lenses that focuses millimeter wave or other radiation onto a plurality of conventional patch antenna elements. The lenses...
5917458 Frequency selective surface integrated antenna system  
A frequency selective surface integrated antenna is provided which compri a frequency selective surface, including an electrically non-conductive substrate and an electrically conductive layer,...
5900847 Dielectric lens apparatus  
The radiation directivity of radio waves can be controlled more easily over a wider range by using the disclosed dielectric lens. A dielectric lens element having a curved surface is bonded to one...
5892485 Dual frequency reflector antenna feed element  
A dual frequency feed element for a parabolic reflector antenna system, comprising a conductive cavity having a central axis, the cavity mounted at the focal point of a parabolic reflector surface...
5886986 Duplexer having dual coupled line characteristics  
A duplexer having dual coupled line characteristics is disclosed. With a small number of resonators and without using an external device such as a chip inductor or a chip capacitor, the signals of...
5864322 Dynamic plasma driven antenna  
An electronic scan antenna for generating an electrically scanned RF beam in response to an incident RF beam having at least one operating frequency band associated therewith includes a ground...
5861860 Protector for one or more electromagnetic sensors  
A frequency-selective surface designed to transmit (allow to pass through) electromagnetic radiation around one or more predetermined transmission frequencies. The frequency-selective surface...
5859615 Omnidirectional isotropic antenna  
An omnidirectional isotropic antenna employing a tubular waveguide 12, a dielectric insert 18 which includes a lens 20 and a depending stem 22. The lens 20 is an elliptoid generated by rotating an...
5828344 Radiation sensor  
A radiation sensor for the microwave and millimeter-wave regions incorporates a lens having two parallel focal planes, these being defined by a polarization-selective reflector grid within the...
5815121 Flatplate array antenna with polarizer lens  
An improved flatplate array antenna has a polarizer lens positioned adjacent the array. The polarizer lens is made of at least one dielectric sheet having an upper half and a lower half. Each half...
5767789 Communication channels through electrically conducting enclosures via frequency selective windows  
Communication of information between the inside and the outside of an electrically conducting enclosure is performed through the use of a frequency selective surface on the electrically conducting...
5757323 Antenna arrangements  
A microstrip patch or slot radiating element is coupled to a dielectric rod antenna by way of a tapered tubular dielectric guide formed integrally with the rod. An array of radiating elements may...
5739796 Ultra-wideband photonic band gap crystal having selectable and controllable bad gaps and methods for achieving photonic band gaps  
The present invention provides multidimensional stacked photonic band gap crystal structures improving the performance of current planar monolithic antennas and RF filters by forbidding radiation...
5736966 Adjustable microwave antenna  
The invention relates to a microwave antenna for the generation of a beam with adjustable parameters. Use is made of a reflective Fresnel zone plate that is written into a thin layer of silicon by...
5712648 Dielectric filter and antenna duplexer  
A dielectric filter includes a dielectric block on which an external conductor is formed except for areas surrounding input and output terminals, a plurality of resonator holes of the same axial...
5689275 Electromagnetic antenna and transmission line utilizing photonic bandgap material  
A photonic bandgap antenna (PBA) (10') utilizes a periodic bandgap material (PBM), which is essentially a dielectric, to transmit, receive, or communicate electromagnetic radiation encoded with...
5679604 Wire diamond lattice structure for phased array side lobe suppression and fabrication method  
A diamond matrix metallic mesh suppresses RF energy, and particularly side lobe energy, in a phased array antenna, while passing main beam energy. The metal mesh emulates the structure of the bond...
5673056 Identical surface shaped reflectors in semi-tandem arrangement  
A pair of dual-gridded shaped reflectors (10) and (20) are arranged one behind the other for transmitting and receiving orthogonally polarized energy waves. A front reflector (10) has a first...
5670965 Compact antenna test range  
A compact antenna test range for performing antenna and radar cross-section measurements has a transmitter for transmitting an electromagnetic wavefront and at least one radio frequency hologram...
5661499 Spherical dielectric lens with variable refractive index  
The spherical dielectric lens with variable refractive index contains modules (1, 4, 7, 9, 12) connected with one another and made from homogeneous dielectric materials with various .di-elect cons....
5652631 Dual frequency radome  
A dual frequency antenna and radome system, including a dual frequency antenna system for operation at a first, higher frequency band and at a second lower frequency band. The antenna system...
5650249 Method for making precision radomes  
Radomes having complexly curved, frequency selective surfaces are made with a high degree of precision to assure part-to-part uniformity in electrical performance using a three-dimensional...
5621423 Electromagnetic energy shield  
A radome for providing a relatively wide-band operation which in a preferred embodiment uses at least a pair of panel means mounted adjacent each other, each having a plurality of discontinuous...
5606335 Periodic surfaces for selectively modifying the properties of reflected electromagnetic waves  
To reduce strong diffractive fields at the baseline edge of a metal body which is reflective of electromagnetic radiation, a substrate substantially transparent to the radiation is placed...
5600325 Ferro-electric frequency selective surface radome  
Ferro-electric frequency selective surface radomes that have dielectric layers that comprise voltage controlled material, and the electrical properties of the dielectric layers are voltage...
5600342 Diamond lattice void structure for wideband antenna systems  
A diamond lattice structure is employed as a ground plane in an array antenna system. The ground plane structure reflects incident energy radiated by the antenna radiating elements. The structure...
5598172 Dual-polarization microwave lens and its application to a phased-array antenna  
A microwave lens of the type described in the French patent No. 2,469,808 is adapted to operate with two crossed polarizations. To this end, each of the phase-shifting channels of the lens is...
5592186 Sectional filter assembly  
A frequency selective device that consists of two or more frequency selective surfaces that are separately manufactured to exacting engineering tolerances. The two or more frequency selective...
5589845 Tuneable electric antenna apparatus including ferroelectric material  
The disclosure relates to ferroelectric and superconducting thin films used in combination to produce low-loss passive microwave and millimeter wave devices which are frequency tuneable. Various...
5581267 Gaussian-beam antenna  
A Gaussian-beam antenna invention comprises a transmitting circuit or a receiving circuit, a resonator consisting of a pair of reflecting mirrors, which consist of a spherical mirror and a planar...
5576721 Composite multi-beam and shaped beam antenna system  
A composite antenna for use in satellite communication provides both the functions of multiple beams and a shaped beam radiated from a single radiating aperture. The radiating aperture may employ a...
5563614 Low noise dual polarization electromagnetic power reception and conversion system  
A low noise dual polarization electromagnetic power reception and conversion system is disclosed. It comprises a first plurality of conducting elements performing a bandpass function on incident...
5563617 Doppler microwave sensor  
A Doppler microwave sensor for a vehicle alarm employs a mixer stage and a signal-processing stage on a printed circuit board, the printed circuit board having a ground plane containing a slot...
5557292 Multiple band folding antenna  
An antenna has one feed for an S-band electromagnetic signal, and a second feed constructed as an array of radiators to service two C-band signal channels. A subreflector having a microwave...
5554999 Collapsible flat antenna reflector  
The reflector consists of a ground plane, enclosed in a ground plane frame, and a phasing plane, enclosed in a phasing plane frame. Spacers maintain the planes in connected, spaced relationship....
5543809 Reflectarray antenna for communication satellite frequency re-use applications  
A dual-polarized antenna includes a planar line or surface array of reradiating elements of two different polarizations. Each reradiating element in one embodiment is a short-circuited vertical or...
5543815 Shielding screen for integration of multiple antennas  
A shielding screen for use in an integrated antenna system that includes at least two antennas that emit interfering signals that interfere with each other and at least one antenna that emits a...
5528249 Anti-ice radome  
An anti-ice radome having a frequency selective surface and a plurality of resistive heating elements is disclosed. The frequency selective surface prevents the resistive heating elements from...
5497169 Wide angle, single screen, gridded square-loop frequency selective surface for diplexing two closely separated frequency bands  
The design and performance of a wide angle, single screen, frequency selective surface (FSS) with gridded square-loop path elements are described for diplexing closely separated signal bands, for...
5497168 Radiator bandwidth enhancement using dielectrics with inverse frequency dependence  
A dielectric material having a dielectric constant which varies inversely with frequency, and preferably with the second power of frequency, fills the space between a radiator and a reflecting...
5486950 Phase correcting zone plate  
A zone plate focusing radiation comprises a plurality of surface portions (20a, 20b, 20c, 20d, 30) corresponding to zones of the zone plate. The surface portions are positioned in a plurality P of...
5486399 Self-supporting convex cover for spacecraft  
A self-supporting convex cover for spacecraft hardware is described. In the preferred embodiment, the cover is made of a laminated material. Strips of material are inserted into the laminate in a...
Matches 251 - 300 out of 566 < 1 2 3 4 5 6 7 8 9 10 11 12 >