Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7369831 | Radio wave receive, radio wave reception integrated circuit, wave clock, and repeater An SW control circuit turns ON and OFF a switch circuit provided between a reception antenna and an RF amplifier circuit, based on a noise removal control signal which is generated by a timing generation circuit and has a constant pulse width and a constant pulse in... | 05/06/2008 |
| 7177341 | Ultra wide bandwidth noise cancellation mechanism and method A mechanism and method are provided for self-canceling noise generated in a UWB receiver and for providing multi-mode operation for the receiver. Noise is canceled by generating a first set of wavelets in a same phase as an incoming signal, and a second set of wavel... | 02/13/2007 |
| 6980772 | Wireless communications system utilizing directional wireless communication device A system for wireless communications is provided. The system includes a hand-held wireless communications device, such as a cell phone. An antenna is connected to the cell phone. The antenna radiates radio waves over an area of less than 360 degrees of arc, such as ... | 12/27/2005 |
| 6922574 | Mobile wireless communication devices with internal antennas and replaceable housings A wireless communication handset and system having improved antenna performance. The system includes a handset body (300) and multiple housing portions with different antenna loading characteristics, for example different materials or shapes, interchangeably ... | 07/26/2005 |
| 6882836 | GAIT antenna interface with special isolation mode A system and method for suppressing spurious signal leakage in a mobile terminal antenna interface without degrading switch linearity or system insertion loss is disclosed. The antenna interface includes an antenna port, a receive port, a transmit port, and a plural... | 04/19/2005 |
| 6507728 | Radio transceiver and a method of preventing transmission spurious response In a radio transceiver operating in a time division duplex system, a cancellation use transmission signal which is reverse in phase and equal in amplitude to a leakage transmission signal from an antenna in the signal transmission is supplied to an input ... | 01/14/2003 |
| 6496149 | Recessed aperture-coupled patch antenna with multiple dielectrics for wireless applications The present invention provides an aperture-fed patch antenna assembly that is recessed into a conductive surface of an external shell of an electronic device. In one embodiment, an antenna feed attached to a removable core of the electronic device may be ... | 12/17/2002 |
| 6122494 | Radio frequency antenna with current controlled sensitivity An antenna circuit configured for use in a radio frequency data communications device has an antenna constructed and arranged to transfer electromagnetic waves, the electromagnetic waves corresponding to a signal carried by the antenna and generated from ... | 09/19/2000 |
| 5970398 | Radio frequency antenna with current controlled sensitivity An antenna circuit configured for use in a radio frequency data communications device has an antenna constructed and arranged to transfer electromagnetic waves, the electromagnetic waves corresponding to a signal carried by the antenna and generated from ... | 10/19/1999 |
| 5930689 | Apparatus and method for producing a plurality of output signals with fixed phase relationships therebetween An apparatus and method produce a plurality of output signals (917-921) with fixed phase relationships therebetween. The apparatus (900) includes a first signal generator (901), a second signal generator (903), and a signal processor (907). The first sign... | 07/27/1999 |
| 5317329 | Microwave detector and horn antenna structure therefor A microwave detector arranged in such a manner that a horn antenna element is fastened to the surface of a microstrip plate having a ground plate on its reverse side. The horn antenna element and the ground plate constitute a microwave receiving antenna s... | 05/31/1994 |
| 5193220 | Device for mounting an electronic part A battery pack mounting device for portable radio equipment having a built-in antenna. The device determines a position of a battery pack, which powers the equipment, inserted in a battery pack accommodating portion provided in the equipment. Various cons... | 03/09/1993 |
| 4571593 | Horn antenna and mixer construction for microwave radar detectors A horn antenna construction, particularly for use in microwave radar detector circuits, comprises a molded horn element that is open at its bottom side, with a ridge molded into its flared top surface, and being electrically conductive at least at microwa... | 02/18/1986 |
| 3939423 | Automobile active receiving antenna An automobile active receiving broadcast band antenna having a bandpass filter input circuit capacitor formed by a metal member insulated from the automobile body and arranged in close vicinity to the windshield and by an automobile body structural elemen... | 02/17/1976 |
