51
Terry M Schaffner: RF chirp signal propagation delay measurement. Digi International, Fogg & Powers, March 10, 2015: US08976060 (1 worldwide citation)

Distance between two radio frequency devices is estimated by receiving a plurality of spread spectrum chirp signals frequency offset from one another, and evaluating the received plurality of spread spectrum chirp signals for relative phase shifts between the plurality of spread spectrum chirp signa ...


52
Hua Cai, Yanzhao Pang, Wei Wang, Wei Xue: Method and apparatus for implementing digital baseband predistortion. Huawei Technologies, October 7, 2014: US08855233 (1 worldwide citation)

An apparatus for implementing digital baseband predistortion includes a transmission channel including a digital-to-analog converter, a modulator, an amplifier and a power amplifier, and further includes a feedback channel analog part including a diode detector, a filter and an analog-to-digital con ...


53
Sunil Dewan: Secure RFID packaging. First Data Corporation, Kilpatrick Townsend & Stockton, November 22, 2011: US08063781 (1 worldwide citation)

Methods and systems are provided for preparing radio-frequency devices for secure distribution. Multiple such radio-frequency devices are received. Each device has an embedded radio-frequency transponder. Each radio-frequency devices is moved sequentially to stations of a preparation device. At a fi ...


54
Vittorio Cavirani, Francesco Trotta, Luca Marcaccioli, Roberto Vincenti Gatti, Franco Manzini, Domenico Di Terlizzi: Radio frequency positioning system for vehicles. Elettric 80 S p A, Tutunjian & Bitetto P C, February 4, 2014: US08643536 (1 worldwide citation)

A positioning system for radio frequency devices includes a two-way radio antenna, for vehicles, having a transmitting and a receiving element. Reference antennas have retro-directive arrays which can shape the signal beams in elevation; polarize transmission and reception signals according to a cir ...


55
Timothy C Kuo, Mansour Keramat, Edward Wai Yeung Liu: In-situ gain calibration of radio frequency devices using thermal noise. NVIDIA Corporation, Cooley, April 23, 2013: US08428194 (1 worldwide citation)

An apparatus for calibrating gain of an radio frequency receiver (“Rx”) is disclosed to provide, among other things, a structure for performing in-situ gain calibration of an RF integrated circuit over time and/or over temperature without removing the RF integrated circuit from its operational confi ...


56
Brian Kean, Jennifer Larsen, David William Cully, James L Collette: Radio-frequency-device personalization. First Data Coporation, Townsend and Townsend and Crew, January 27, 2009: US07482908 (1 worldwide citation)

Radio-frequency devices that have internal radio-frequency chips are personalized. A radio-frequency device is inserted into a package. An identifier is read electromagnetically from the radio-frequency chip with a radio-frequency transceiver while the radio-frequency device is within the package. P ...


57
Martinez de Velasco Cortina Fr, Riezler Manfred: Selective metal removal process for metallized retro-reflective and holographic films and radio frequency devices made therewith. Neology, August 9, 2006: EP1688868-A2 (1 worldwide citation)

A method is disclosed of making a radio-frequency (RF) identification device comprising: forming an antenna on a base layer; and mounting a radio frequency (RF) chip on the base layer in electrical communication with the antenna to form an RF transponder; the antenna being formed by selective de-met ...


58
Kuo Timothy C, Liu Edward Wai Yeung, Keramat Mansour: Apparatus and method for in-situ gain calibration of radio frequency devices using thermal noise. Nvidia, November 22, 2006: EP1724953-A2 (1 worldwide citation)

An apparatus for calibrating gain of an radio frequency receiver ("Rx") is disclosed to provide, among other things, a structure for performing in-situ gain calibration of an RF integrated circuit over time and/or over temperature without removing the RF integrated circuit from its operational confi ...


59
Andrew Tye Hunt, Zhiyong Zhao, Yongdong Jiang, Xiaoyan Wang, Kwang Choi: Radio frequency devices with enhanced ground structure. nGimat Co, March 24, 2015: US08988169 (1 worldwide citation)

Tunable radio frequency (RF) devices, such as phase shifters and filters, are formed by depositing thin film layers on a substrate and patterning the thin film layers by various lithography techniques. A thin film metal layer is patterned to form a plurality of capacitors and inductors, leaving at l ...


60
Warren Anthony Robert: Improvements in or relating to radio frequency devices. Trak Microwave, May 1, 1968: GB1112304-A (1 worldwide citation)

1,112,304. Valve amplifying and oscillating circuits. TRAK MICROWAVE CORPORATION. 29 June, 1965, No. 27599/65. Headings H3F, H3R and H3W. [Also in Divisions H1 and H2] A radio frequency device having distributed constants for operation with an electron tube having anode 28, control grid 26 and catho ...



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