Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8044873 | Antennas with periodic shunt inductors An antenna may be formed from conductive regions that define a gap that is bridged by shunt inductors. The inductors may have equal inductances and may be located equidistant from each other to form a scatter-type antenna structure. The inductors may also have unequ... | 10/25/2011 |
| 7705795 | Antennas with periodic shunt inductors An antenna may be formed from conductive regions that define a gap that is bridged by shunt inductors. The inductors may have equal inductances and may be located equidistant from each other to form a scatter-type antenna structure. The inductors may also have unequ... | 04/27/2010 |
| 7439924 | Offset overlapping slot line antenna apparatus An offset overlapping slot line comprises a first metallization on a first side of a dielectric substrate and a second metallization on a second side of a dielectric substrate cooperating to yield a transmission line. By overlapping the first and second metallizatio... | 10/21/2008 |
| 7403170 | Differential-feed slot antenna With a differential feed line 103c, slot resonators 601, 603, 605, and 607 are allowed to operate in pair, a slot length of each resonator corresponding to a ½ effective wavelength during operation. Slot resonators which are excited out-... | 07/22/2008 |
| 7397440 | Extended phase center tapered slot antenna A Extended Phase Center Tapered Slot Antenna (NC#97529). The apparatus includes a first antenna element capable of transmitting and receiving radio frequency energy; a second antenna element capable of transmitting and receiving radio frequency energy, wherein the f... | 07/08/2008 |
| 7388552 | Multibeam antenna The present invention has been made to reduce the size and thickness of a multibeam antenna capable of switching the directivity in multi directions. The present invention provides a multibeam antenna including an antenna element array including one or more feed ele... | 06/17/2008 |
| 7358915 | Phase shifter module whose linear polarization and resonant length are varied by means of MEMS switches A phase shifter module (CD), dedicated to a reflectarray antenna, is defined by a characteristic resonant length and, in at least one chosen place, has an MEMS type device (DC, DC′) able to be placed in at least two different states respectively permitting and pro... | 04/15/2008 |
| 7348928 | Slot antenna having a MEMS varactor for resonance frequency tuning Briefly, in accordance with one embodiment of the invention, a slot antenna may include a primary slot and one or more secondary slots. The size of the antenna may be reduced by adding one or more of the secondary slots which may add additional inductance to the ant... | 03/25/2008 |
| 7339541 | Wideband cavity-backed antenna An antenna system is disclosed that includes a mast, waveguides positioned about the mast, and a feed system positioned external to the mast and between adjacent waveguides, such the feed system can be easily serviced. The waveguides include radiator elements that a... | 03/04/2008 |
| 7336233 | Radiation diversity antennas The present invention relates to a radiation diversity antenna consisting of radiating elements of the slot-line type coupled electromagnetically to a feed line, in which the radiating elements have a tree structure, each radiating element having a length equal to k... | 02/26/2008 |
| 7305935 | Slotted antenna waveguide plasma source A high density plasma generated by microwave injection using a windowless electrodeless rectangular slotted antenna waveguide plasma source has been demonstrated. Plasma probe measurements indicate that the source could be applicable for low power ion thruster appli... | 12/11/2007 |
| 7277060 | Antenna In an antenna to be used for UWB communication, a taper slot is formed in a rectangular conductive plate, a vertical slit for separating the conductive pate is formed at the top of the taper slot, a feeding point part and a grounding point part are formed at the con... | 10/02/2007 |
| 7271778 | Antenna device and radar device using the same An antenna device having a primary radiator that includes a transmission portion formed of a cylindrical waveguide extending in a direction parallel to the frontward direction of the antenna device, and a radiation portion of a rectangular horn shape, extending in a... | 09/18/2007 |
| 7262740 | Small planar antenna with enhanced bandwidth and small rectenna for RFID and wireless sensor transponder A small planar antenna with an enhanced bandwidth and a small rectenna for RFID (Radio Frequency Identification) and wireless sensor transponder are provided. The small planar antenna includes a dielectric substrate, a metal layer formed on an upper part of the diel... | 08/28/2007 |
| 7233297 | Steerable radial line slot antenna A steerable antenna comprising an array of T-shaped slots. The location of the slots is moved to define an array of ring- or spiral-patterned phase constant regions. Distortions or contractions of the pattern occur by repositioning some or all of the slots forming t... | 06/19/2007 |
| 7224685 | Method of detection of signals using an adaptive antenna in a peer-to-peer network An adaptive antenna signal identification process to provide increased interference rejection in a wireless data network such as a wireless Local Area Network (LAN). The adaptive antenna is located at an access point and can be steered to various angle of arrival or... | 05/29/2007 |
| 7202831 | Multi-band frequency loop-slot antenna A loop-slot antenna defined by a conductive plate includes a first slot and a second slot. The first slot and the second slot divide the conductive plate into a first strip, a second strip and a patch element. The first slot is an L-shaped slot and includes a transv... | 04/10/2007 |
| 7191507 | Method of producing a wireless communication device A method for manufacturing wireless communication devices for use in tracking or identifying other items comprises a number of cutting techniques that allow the size of the antenna for the wireless communication device. Further, the chip for the wireless communicati... | 03/20/2007 |
| 7187339 | Antenna apparatus In order to have an antenna apparatus small in size and capable of switching its directivity pattern without degrading its antenna efficiency, the present invention provides an antenna apparatus having a driven element formed at an approximately center position of a... | 03/06/2007 |
| 7187337 | Planar antenna with slot line A slot-line planar antenna has a substrate, an outer conductor disposed on one principal surface of the substrate and having an opening defined therein, an inner conductor disposed on the one principal surface of the substrate and positioned within the opening, the ... | 03/06/2007 |
| 7148855 | Concave tapered slot antenna A concave tapered slot antenna. The antenna includes a first antenna element, a second antenna element and a concave dielectric lens. The first and second antenna elements are situated in a tapered slot antenna configuration. The concave dielectric lens is situated ... | 12/12/2006 |
| 7136025 | Dual-band antenna with low profile A dual-band antenna can be used in wireless communications under Bluetooth and IEEE 802.11a/b/g standards includes a rectangular base (1) forming a transverse bar (5) and a grounding bar (41) extending therefrom in a same direction, a radiating ... | 11/14/2006 |
| 7123200 | Sea surface antenna A sea surface antenna comprises a cylindrical tube of metallic material 13 on a dielectric former. The tube has a longitudinal slot shorted at each end and coupled at its midpoint to a coaxial feed. The slot is bridged by two groups of capacitances each group being ... | 10/17/2006 |
| 7123204 | Energy source communication employing slot antenna The invention relates to a wireless communication device that is coupled to an energy source, such as a battery, capacitor, or solar cell. The wireless communication device is coupled to a slot in the energy source to form a slot antenna for wireless communication. ... | 10/17/2006 |
| 7091919 | Apparatus and method to increase apparent resonant slot length in a slotted coaxial antenna An oblique angle defining the slot face opposing a coupler in a slotted coaxial antenna increases the apparent slot length and therewith the capacitance of the driven element. The altered slot angle, in concert with a flattened facing surface on the associated coupl... | 08/15/2006 |
| 7079081 | Slotted cylinder antenna An antenna (100) for RF communications. The antenna includes a radiating member (102) which is substantially tubular so as to define a cavity (104) therein. The radiating member (102) is made of a conductive material having a non-conducti... | 07/18/2006 |
| 7064723 | Spectral control antenna apparatus and method A spectral control antenna apparatus includes a feed region or feed gap and a surrounding space or medium. A signal path between a feed region and a surrounding space or medium is characterized by a length dependent impedance with a plurality of extrema whereby the ... | 06/20/2006 |
| 6995724 | Waveguide slot type radiator having construction to facilitate manufacture A waveguide portion has a waveguide with a rectangular section surrounded by a pair of narrow side plates opposed to each other, a pair of broad side plates extending along lengthwise directions of the pair of narrow side plates. A radiation portion is provided on o... | 02/07/2006 |
| 6985119 | Multiple feed point slot antenna A wireless communication device and method for identifying a container, or communication information about a container using a slot in the container as an antenna. The device includes a wireless communication device for transmitting information regarding the contain... | 01/10/2006 |
| 6965343 | System and method for antenna tracking A method for antenna tracking includes providing a central feed element in an antenna focal region with additional feed elements in an azimuth coordinate to provide a multitude of feed elements that each have a static beam position, and varying ratios of amplitudes ... | 11/15/2005 |
| 6963314 | Dynamically variable beamwidth and variable azimuth scanning antenna A dynamically variable beamwidth and/or variable azimuth scanning antenna includes a plurality of active radiating columns and a plurality of continuously adjustable mechanical phase shifters. The columns define a beam having a beamwidth and an azimuth scan angle. E... | 11/08/2005 |
| 6954176 | Device and method for an antenna array with switchable wide-angle coverage In order in simple manner to switchably cover a wide angle in sectors using an antenna array with broad main lobe, an antenna elements are so arranged, that the elements can be individually selected, so that some elements of the array can be operated in-phase and ot... | 10/11/2005 |
| 6906677 | Antenna, antenna device, and radio equipment An antenna has a conductive bottom member; a conductive side member; and a conductive member arranged in a space surrounded by the bottom member and the side member, wherein the conductive member i... | 06/14/2005 |
| 6879296 | Horizontally polarized slot antenna with omni-directional and sectorial radiation patterns A slot antenna comprising: a first and second boards each having an edge attached to respective opposite edges of a center board to form an essentially C-shaped open-ended channel having an inner surface and an outer surface; the center board having a slot for radia... | 04/12/2005 |
| 6864848 | RF MEMs-tuned slot antenna and a method of making same A slot antenna for receiving and/or transmitting a RF signal at a desired one of a plurality of different frequencies. The slot antenna includes at least one conductive sheet having a slot defined therein, the slot being longer than it is wide and having at least on... | 03/08/2005 |
| 6853344 | Radial line slot antenna In an RLS antenna, the present invention allows adjusting the optimum positional relationship between the feeder section of the feeder disk and the feeder section of the antenna disk, simply, quickly and at high accuracy by a visual check, so that mass production be... | 02/08/2005 |
| 6847332 | Switching device for apparatuses for receiving and/or transmitting electromagnetic waves The present invention relates to a device for receiving and/or transmitting signals comprising an assembly of n means for receiving and/or transmitting waves with longitudinal radiation of the printed slot-antenna type, where n is an integer greater than or equal to... | 01/25/2005 |
| 6781554 | Compact wide scan periodically loaded edge slot waveguide array A unit element of a periodically loaded edge slot array includes a reduced-height waveguide section having top and bottom walls and opposed first and second sidewalls defining a waveguide space. A slot is formed in the first side wall at an angle with respect to a w... | 08/24/2004 |
| 6703984 | Common aperture UHF/VHF high band slotted coaxial antenna A slotted coaxial antenna design that accomplishes simultaneous DTV and NTSC broadcast with minimal tower windloading is disclosed. In a preferred embodiment, the antenna design includes a VHF slotted coaxial antenna that acts as a framework to house mult... | 03/09/2004 |
| 6703983 | Slot antenna having irregular geometric shape A slot antenna (1) for an electronic device includes an antenna body (10) with a slot (11) defined therein and a coaxial feeder cable (2) electrically connected to the antenna body. The antenna body has variously shaped notches and holes cut near the slot... | 03/09/2004 |
