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| Number | Title | Issue Date |
| 7907926 | Method and system for utilizing an antenna for frequency modulation (FM) communication, near field communication (NFC) and radio frequency identification (RFID) Aspects of a method and system for utilizing a frequency modulation (FM) antenna for near field communication (NFC) and radio frequency identification (RFID) are presented. Aspects of a system for utilizing an FM antenna for NFC and RFID may include a tuning control... | 03/15/2011 |
| 7792512 | System and method for dynamic impedance tuning to minimize return loss A system for tuning an impedance at a node comprises a first component associated with a first impedance when the first component is operating and a second impedance when the first component is not operating. The system further comprises a second component coupled t... | 09/07/2010 |
| 7376407 | System and method for dynamic impedance tuning to minimize return loss A system for tuning an impedance at a node comprises a first component associated with a first impedance when the first component is operating and a second impedance when the first component is not operating. The system further comprises a second component coupled t... | 05/20/2008 |
| 7333790 | Method and apparatus for generating arbitrary phase shift using a phase shifter based on adding two perpendicular vectors with variable gains A radio frequency (RF) phase shifter having an RC-CR circuit that includes a first capacitor having a first capacitor node and a second capacitor node and a first resistor coupled between the first capacitor node and a ground. The RC-CR circuit also includes a secon... | 02/19/2008 |
| 7239858 | Integrated switching device for routing radio frequency signals An RFID reader accessible thorough a personal computer and includes a PC card interface and a controller both operating according to clock signals from a crystal oscillator. The RFID reader further includes a linearized power amplifier modulator in a transmit path, ... | 07/03/2007 |
| 7184731 | Variable attenuator system and method A variable attenuator comprising a first attenuator for attenuating a RF signal according to a fixed voltage, a second attenuator connected in parallel to the first attenuator and attenuating the RF signal according to a control voltage for determining an attenuatio... | 02/27/2007 |
| 7181183 | Telecommunication system incorporating a vanadium redox battery energy storage system A telecommunication system incorporates a vanadium redox battery energy storage system. The vanadium redox battery energy storage system receives and is charged by DC power. Upon power interruption, telecommunication equipment relies on the vanadium redox battery en... | 02/20/2007 |
| 7142833 | Matching unit A matching unit includes a switching means for switching an inductance of a first inductor. This switching means sets an inductance such that a first inductor shows an inductance property to both of the VHF low-band and high-band, and shows a capacitance property to... | 11/28/2006 |
| 7110729 | Apparatus and method for generating a temperature insensitive reference current A constant current source for generating a constant reference current that is relatively temperature insensitive. The constant current source comprises: i) first circuitry for generating a first output current that increases with increases in temperature; ii) second... | 09/19/2006 |
| 7072698 | Directional antenna for hand-held wireless communications 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 ... | 07/04/2006 |
| 7065328 | Superregenerative AM demodulator An AM receiver incorporates an antenna, a transistor, a current source, and a power supply. The antenna is connected to a gate electrode of the transistor and through a link to a signal earth. In operation, the antenna receives radiation and generates a correspondin... | 06/20/2006 |
| 6996389 | Power supply for a satellite receiver A power supply for a satellite receiver system includes a dual input supply voltage arrangement. When a higher output voltage is selected, a source of a lower supply input voltage is coupled to an input main current conducting terminal of a series pass transistor. O... | 02/07/2006 |
| 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 |
| 6944437 | Electronically programmable multimode circuit An electronically programmable multimode circuit is described. More particularly, the present invention is an electronically programmable multimode circuit that includes a first path and a second path wherein a mode and a signal directional flow direction is control... | 09/13/2005 |
| 6909885 | RF modulator and switch having high antenna isolation An RF modulator/switch selectably couples a locally generated and conducted RF signal or an antenna RF signal to a broadcast radio receiver. A local RF input receives the conducted RF signal. An antenna RF input receives the antenna RF signal in response to a radiat... | 06/21/2005 |
| 6748197 | Single antenna for receipt of signals from multiple communications systems A method and device for using a single antenna for simultaneously receiving radio frequency signals in different L-band and GPS data band radio frequency bands embodied by example in a circuit having a directional coupler configured to direct a signal input at a fir... | 06/08/2004 |
| 6738650 | Radiation shielding tri-band antenna adapted to provide dual band polarizations A radiation shielding apparatus for a wireless communication device operable in at least two cellular frequency spectrums includes a multi-band antenna operably associated with an electromagnetic radiation shield that extends along a length of the antenna. The shiel... | 05/18/2004 |
| 6553216 | RF tunable filter arrangement with tunable image trap A tuner includes a tunable filter for selecting a desired RF signal in response to a tuning control signal and a tunable image trap for rejecting the undesired image signal corresponding to the desired RF signal responsive to the tuning control signal cou... | 04/22/2003 |
| 6253070 | Diode amplifier bypass circuit RF circuit includes an amplifier and a shunt. The shunt is controlled to provide a path around the amplifier for avoiding intermodulation distortion caused by overdriving the amplifier. The shunt is formed by a diode with capacitors that match to the RF c... | 06/26/2001 |
| 5754141 | Wireless communication device having a reconfigurable matching circuit A wireless communication device (20) provides a matching state between a radio circuit (28) and an antenna assembly (26) in both its retracted and extended positions, and does so with an elegant design that increases reliability and manufacturability by r... | 05/19/1998 |
| 5749046 | Signal level measuring apparatus for directing an antenna toward a satellite A signal level measuring apparatus measures a level of a satellite signal from a geostationary satellite as received by a receiving antenna and provides an output to determine whether the antenna is correctly directed to the satellite. The apparatus is di... | 05/05/1998 |
| 5697087 | Semiconductor device with a filter formed of 3-element series-and-parallel resonators A 3-element series parallel resonator, which performs series resonance and parallel resonance at a predetermined frequency by a combination of three elements including an inductor and a capacitor of concentrated constants, is used as a filter. This design... | 12/09/1997 |
| 5678198 | System for controlling signal level at both ends of a transmission link, based upon a detected value The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, characterized as either an analog or digital link. The system includes a pre-processing unit, provided at a first location, that... | 10/14/1997 |
| 5678219 | Integrated electronic warfare antenna receiver An RF antenna and an associated receiver are proximately located in an integrated antenna/receiver unit thereby eliminating the need for baluns and inter-component cabling characteristic of prior designs. Integration of the receiver with the antenna provi... | 10/14/1997 |
| 5678202 | Combined antenna apparatus and method for receiving and transmitting radio frequency signals An antenna system and method for use in a portable unit of a wireless telephone headset, wireless telephone headset adapter, or other telecommunication device combines a capacitive coupling antenna with an electric field sensitive antenna. The electric fi... | 10/14/1997 |
| 5634203 | Adaptive multi-receiver shared antenna matching system and method An adaptive multi-receiver shared antenna matching system and corresponding method includes an antenna (101). A plurality receiver devices (103) are operably coupled to the antenna (101). Degree of coupling between each of the receiver devices (103) and t... | 05/27/1997 |
| 5613234 | Receive filter using frequency translation for or in cellular telephony base station A device for filtering wide-band signals at radio frequencies is usable either in a base station cellular telephony system or separately. The wide-band signal occupies a total frequency band comprising frequency bands allocated to that signal and a centra... | 03/18/1997 |
| 5542106 | Electronic device having an RF circuit integrated into a movable housing element When a radio frequency (RF) circuit is integrated into a movable housing element of an electronic device one must consider the affects of the surrounding area when the RF circuit is in a functioning position. A preferred embodiment is a radiotelephone (10... | 07/30/1996 |
| 5517686 | Diversity receiver for FM stereo utilizing a pilot tone multiple for phase alignment of received signals An FM stereo receiving system and a method for aligning phases of RF signals received by multiple antennas. The FM stereo receiving system includes two antennas for receiving RF signals having a common frequency but potentially different phases. The syste... | 05/14/1996 |
| 5507010 | Arrangement for measuring at frequencies actually used for signalling, the condition of a receiving antenna positioned apart from other base station equipment at a base station of a radio system An arrangement for measuring the condition of a receiver antenna at a base station, utilizing an antenna amplifier positioned in connection with an antenna apart from other base station equipments, e.g., at a mast. A measuring signal is generated in conne... | 04/09/1996 |
| 5483662 | Spade signal receiving station In an earth-based receiving station for receiving radio signals transmitted from a satellite relay station, a common first frequency converter and at least two receivers are provided. One of the receivers is used as a control receiver to receive a CSC car... | 01/09/1996 |
| 5483693 | Combining antenna element signals A vehicle radio receiver circuit includes two antennas for mounting on the vehicle. The antennas are significantly less than one quarter of a wavelength in length at the desired frequency of operation, and the outputs of the antenna elements are coupled t... | 01/09/1996 |
| 5457811 | System for controlling signal level at both ends of a transmission sink based on a detected value The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, and also to a process for increasing the dynamic range of a transmission link. An instruction setting process is also provided f... | 10/10/1995 |
| 5355103 | Fast settling, wide dynamic range vector modulator A fast settling, wide dynamic range vector modulator for use in an interference cancellation system or the like includes a quadrature hybrid which receives an RF signal and divides the signal into a primary in-phase component signal and a primary quadratu... | 10/11/1994 |
| 5335368 | Portable radio apparatus having variable impedance matching circuit between antenna and radio circuit A portable radio apparatus having a casing thereof keeps a matching state of an antenna thereof in the call waiting state and in the operating state of the apparatus. The casing is foldable and expandable and accommodates therein a transmitting and receiv... | 08/02/1994 |
| 5321849 | System for controlling signal level at both ends of a transmission link based on a detected valve The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, and also to a process for increasing the dynamic range of a transmission link. An instruction setting process is also provided f... | 06/14/1994 |
| 5301358 | Automatic antenna tuning method and apparatus A wristwatch paging receiver is provided with an antenna matching network that automatically retunes the network at the beginning of a listening interval. During the retuning operation, a control signal is applied to a variable tuning element in the match... | 04/05/1994 |
| 5276920 | Antenna selection switch for a diversity antenna The invention relates to a circuitry by means of which it is possible to switch to a mobile telephone that antenna out of two or more antennae which has the best signal, without substantial alterations in the mobile telephone itself. According to the inve... | 01/04/1994 |
| 5257405 | Method and system for setting up LOS-radio communication between mobile or stationary remote stations For setting up LOS radio links between mobile calling transmitting/receiving stations and other mobile or stationary remote transmitting/receiving stations in a predetermined operating area, especially in the frequency range above 1 GHz, every mobile stat... | 10/26/1993 |
| 5201072 | Tuner for diversity reception having a fixed antenna and a retractive antenna A radio tuner for diversity reception, wherein a fixed antenna and a retractive antenna are installed as a receiving antenna and whichever the antenna at the stronger electric field strength is selectively switched to receive a radio signal in response to... | 04/06/1993 |
