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| Number | Title | Issue Date |
| 7010335 | Apparatus and method to provide antenna diversity Briefly, in accordance with an embodiment of the invention, an apparatus and method to provide antenna diversity to reduce multipath effects is provided. The apparatus may include a primary antenna and a secondary antenna, wherein the antenna gain of the secondary a... | 03/07/2006 |
| 6999042 | Low visual impact monopole tower for wireless communications An antenna system incorporating at least two antennas circumferentially arranged with a side-by-side relationship about a monopole tower. The main beam direction of the radiation pattern emanating from each antenna may be remotely adjusted in elevation and/or azimut... | 02/14/2006 |
| 6920315 | Multiple antenna impedance optimization A multiple antenna mobile communication device, such as a cellular telephone, having multiple radios and multiple antennas located in close proximity to each other uses a parallel tuning circuit to optimize the isolation between the antennas. The parallel tuning cir... | 07/19/2005 |
| 6842141 | Fourpoint antenna Wideband antennas with omnidirectional coverage have both military and commercial applications. In one embodiment, the Planar Inverted Cone Antenna (PICA) is composed of a single flat element vertically mounted above a ground plane. A geometry of Planar Inverted Con... | 01/11/2005 |
| 6518934 | Parasitically driven dipole array A steerable dipole array including a plurality of end loaded electrically short dipole antenna sections arranged along a common longitudinal axis. The antenna sections include active transmit/receive modules with a common DC power line used to power the m... | 02/11/2003 |
| 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 |
| 6201511 | Composite antenna for duplexer-free duplex operation terminals and method An antenna assembly includes a receiving antenna and a separate transmitting antenna with an isolation circuit disposed in between to thereby isolate the Tx and Rx signals and provide a sufficient amount of attenuation outside the desired frequency band. ... | 03/13/2001 |
| 6005530 | Switched gain antenna for enhanced system performance A switched gain antenna array comprising a plurality of dipole elements disposed in series with a phasing stub coupled between adjacent ones of the dipole elements. An antenna feed line is coupled to a first one of the dipole elements to couple the RF sig... | 12/21/1999 |
| 5600339 | Antenna An antenna comprising a first conductive element having a first end and a second end. The antenna is also comprised of a second conductive element having a first end and a second end. The second conductive element is adjacent and essentially in parallel t... | 02/04/1997 |
| 5481271 | Two-wave antenna for telephones used in vehicles A two-wave antenna for telephones used in vehicles which includes two radiating elements in which one end of each of the two radiating elements is respectively connected to one end of a single phase coil and the effective radiating lengths of the two radi... | 01/02/1996 |
| 5024447 | Transmitter in arrow An arrow incorporating a radio signal transmitting device allows a hunter to find a lost arrow. The arrow includes a hollow aluminum shaft which acts as the primary transmitting antenna. A braded metal cable inside the hollow shaft acts as a secondary ant... | 06/18/1991 |
| 4872021 | Collinear dipole array with inductive and capacitive phasing The antenna represents colinearly arranged half-wave dipoles. On the side of each final half-wave dipole is a quarter-wave dipole. The connection between the dipoles is alternately capacitive and inductive each providing a phase shift within the range of ... | 10/03/1989 |
| 4574290 | High gain vertically polarized antenna structure A high gain vertically polarized antenna section includes a hollow conductive central cylinder which is used to encase feed lines and power dividers used for feeding the antenna section. The cylinder is surrounded by an array of symmetrically disposed ver... | 03/04/1986 |
| 4220956 | Collinear series-fed radio frequency antenna array A collinear series-fed antenna array formed from two spaced-apart electrical conductors extending parallel to one another in a longitudinal direction and having regularly spaced complementary changes in transverse dimensions along the longitudinal directi... | 09/02/1980 |
| 4101902 | Electronic scanning antenna There is described an electronic scanning antenna comprising a multiplicity of elementary radiators arranged for example in a vertical plane and constituting an array designed for simultaneous surveillance and tracking, the array being fed by two parallel... | 07/18/1978 |
