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Class Information
Number: 342/448
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Directive > Beacon or receiver > Direction-finding receiver only > Having a coil or loop type antenna
Description: Subject matter wherein the direction finding receiver is coupled to an antenna which consists of one or more loops of wire.

Patents under this class:

Patent Number Title Of Patent Date Issued
8450997 Electromagnetic position and orientation sensing system May. 28, 2013
8204319 Image compression apparatus and image compression method Jun. 19, 2012
7936852 Antenna diversity system for radio reception for motor vehicles May. 3, 2011
7843386 System and method for determining the beam center location of an antenna Nov. 30, 2010
7724191 Apparatus and method for tracing position and direction of target object through RF signal May. 25, 2010
7640106 Hybrid tracker Dec. 29, 2009
7555330 Intrabody navigation system for medical applications Jun. 30, 2009
7193561 Phase controlled antennae for data transmission between mobile devices Mar. 20, 2007
6928383 Three-dimensional information detecting system, three-dimensional information detecting device and input device for three-dimensional information detecting system Aug. 9, 2005
6882953 Stylus with position signal transmission Apr. 19, 2005
6850738 Method and antenna arrangement for coupling external antennas to a communication unit Feb. 1, 2005
6833814 Intrabody navigation system for medical applications Dec. 21, 2004
6768457 Diversity systems for receiving digital terrestrial and/or satellite radio signals for motor vehicles Jul. 27, 2004
6720921 Position location and tracking method and system employing low frequency radio signal processing Apr. 13, 2004
6693557 Vehicular traffic sensor Feb. 17, 2004
6624785 Receiver designed to pick up an electromagnetic signal and system using such a receiver Sep. 23, 2003
6593884 Intrabody navigation system for medical applications Jul. 15, 2003
6519550 Object scanner Feb. 11, 2003
6188355 Wireless six-degree-of-freedom locator Feb. 13, 2001
6147480 Detection of metal disturbance Nov. 14, 2000
6075498 Surface wave directional detection system and method Jun. 13, 2000
6035951 System for tracking and/or guiding an underground boring tool Mar. 14, 2000
5796366 Method of and apparatus for position location and tracking of a vehicle or the like by the reception at the vehicle of pulsed radio navigation signals as of the Loran-OC type and the like, wit Aug. 18, 1998
5719550 Arrangement for identification of a movable object having a transponder Feb. 17, 1998
5640170 Position and orientation measuring system having anti-distortion source configuration Jun. 17, 1997
5600330 Device for measuring position and orientation using non-dipole magnet IC fields Feb. 4, 1997
5495129 Electronic device for multiplexing several loads excited by alternating current Feb. 27, 1996
5347289 Method and device for measuring the position and orientation of objects in the presence of interfering metals Sep. 13, 1994
5323167 Antenna configuration and system for determining the direction of a radio frequency signal Jun. 21, 1994
5315308 Method for eletromagnetic source localization May. 24, 1994
5307072 Non-concentricity compensation in position and orientation measurement systems Apr. 26, 1994
5124711 Device for auto-adaptive direction and polarization filtering of radio waves received on a network of aerials coupled to a receiver Jun. 23, 1992
5070462 Device for locating a boring machine Dec. 3, 1991
4845503 Electromagnetic digitizer Jul. 4, 1989
4809007 Navigation method Feb. 28, 1989
4742356 Method and apparatus for determining remote object orientation and position May. 3, 1988
4737794 Method and apparatus for determining remote object orientation and position Apr. 12, 1988
4688037 Electromagnetic communications and switching system Aug. 18, 1987
4675683 Spent hunting arrow locating means Jun. 23, 1987
4613866 Three dimensional digitizer with electromagnetic coupling Sep. 23, 1986
4573053 Automatic direction finder Feb. 25, 1986
4314252 Preamplifier for ADF loop antenna Feb. 2, 1982
4207572 Sky wave DF antenna system Jun. 10, 1980
4158843 Automatic direction finder antenna preamplifier processor Jun. 19, 1979
4054881 Remote object position locater Oct. 18, 1977
4040058 Direction finder Aug. 2, 1977

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