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| Number | Title | Issue Date |
| 7414533 | System for placing radio frequency identification (RFID) antennas, tags and interrogators A system and method for optimally placing radio frequency identification (RFID) antennas. The system varies the placement of RFID tag and interrogator antennas with respect to each other and a stationary object or objects. A signal generator sends a known reference ... | 08/19/2008 |
| 7132948 | System for optimally placing radio frequency identification (RFID) antennas, tags, and interrogators A system and method for optimally placing radio frequency identification (RFID) antennas. The system varies the placement of RFID tag and interrogator antennas with respect to each other and a stationary object or objects. A signal generator sends a known reference ... | 11/07/2006 |
| 6919854 | Variable inclination continuous transverse stub array An antenna array employing continuous transverse stubs as radiating elements is disclosed. In an exemplary embodiment, the array includes an upper conductive plate structure comprising a set of continuous transverse stubs, and a lower conductive plate structure disp... | 07/19/2005 |
| 6486839 | Relative elevation detection for aircraft pilot warning system An elevation angle detection device uses signals from first and second of oppositely pointing antennas to determine an elevation angle of an emitting source. The signal from the second antenna is inverted and phase-compared with the direct signal from the... | 11/26/2002 |
| 6411264 | Two-element driven array with improved tuning and matching A two-element driven array with improved tuning and matching. First and second elongate conductive elements are provided having respective feed point gaps disposed substantially at their centers, the second elongate element being substantially coplanar an... | 06/25/2002 |
| 6313800 | Adjustable broadband antenna An adjustable antenna for receiving broadband signals. The antenna includes a first elongated antenna rod that is held next to a second elongated antenna rod in a parallel orientation to the first elongated antenna rod. The antenna rods are supported by a... | 11/06/2001 |
| 6314275 | Hand-held transmitting and/or receiving apparatus A hand-held transmitting and/or receiving apparatus has an elongated housing, an electric circuit inside the housing, an earphone at one side and one end of the housing, an electric ground plane at the other side of the housing opposite to the earphone, a... | 11/06/2001 |
| 6275192 | Planar antenna A small planar antenna combined with a printed circuit board (PCB). The planar antenna includes: a dielectric layer with a predetermined thickness; first and second ground layers formed on top and bottom surfaces of the dielectric layer, respectively, cor... | 08/14/2001 |
| 6218991 | Compact planar inverted F antenna A compact planar inverted F antenna suited for remote wireless metering includes a circuit element, a ground plane and a feed probe. The circuit element has a planar portion with a reactance window, and a narrowed tab that extends transverse to the planar... | 04/17/2001 |
| 6069587 | Multiband millimeterwave reconfigurable antenna using RF mem switches A multiband millimeterwave antenna system for communicating signals in multiple frequency bands is disclosed. A main antenna body is connected to antenna extensions by micro-electro-mechanical switches. By opening and closing the switches, the length of t... | 05/30/2000 |
| 5977917 | Antenna apparatus capable of producing desirable antenna radiation patterns without modifying antenna structure A portable communication system includes a first metal housing for containing a high frequency circuit unit such as a transmitting circuit and a receiving circuit, a second metal housing for containing a low frequency circuit unit such as a control circui... | 11/02/1999 |
| 5394164 | Human-equivalent antenna for electromagnetic fields An antenna for use in measuring current induced in a human body from exposure to radio frequency, electromagnetic fields approximates the impedance the human body over a wide frequency band of operation. The antenna includes an elongated resistive strip s... | 02/28/1995 |
| 4814751 | Patient tracking system A patient tracking system is employed to determine when an occupant leaves the confines of a nursing home or similar institution. Each patient has a transmitter strapped to his or her wrist which emits a signal having a distinctive radio frequency. The co... | 03/21/1989 |
| 4209790 | Vertical antenna with stub cancellation means Vertical antenna including a vertical radiator having a height of three-half wavelengths, a cancellation stub electrically connected to the vertical radiator three-quarters wavelength upward from a feed point at the base of the vertical radiator and exten... | 06/24/1980 |
| 4125840 | Broad band dipole antenna A dipole antenna consisting of a number of sub-elements, each sub-element comprising a plurality of thin electric conductors or strips of wires arranged on the surface of an insulating cylinder. The conductors in each sub-element have the same length and ... | 11/14/1978 |
| 3932875 | Directional antenna A single element directional antenna consisting of a cylindrical element of such a size compared to the wavelength of the received signal that measurable difference on phase are detectable at spaced output points around the circumferential edge of the ele... | 01/13/1976 |
