Hrl Laboratories, LLC

National University of Singapore

Dreamcore Technologies Sdn Bhd

Grant Andrew Ellis

Miroslav Micovic

Keh-Chung Wang

JeongSun Moon

Jeong-sun Moon

Ara K Kurdoghlian

Chin Soon Teoh

Saxon Sean Ian Liw

A human identifier system capable of distinguishing between multiple known people includes a first antenna and a second antenna. Particularly, the second antenna is operably selects the distance between to allow multiple people to walk, run or move between the antenna pairs. Additionally, the system also includes a radio frequency transmitter for generating multiple radio signals and a radio frequency receiver for receiving the transmitted radio signals. The system also includes a data processor operably connected to the radio frequency receiver with a processing means for processing the received signals from radio frequency receiver to provide output signals to identify a person walking, running or moving between the first antenna and the second antenna.

System and method for detecting, monitoring and identifying human beings

A post-distortion method for cascading amplifier stages in a two-stage microwave power amplifier and a dynamic biasing method using back-end processing for correcting nonlinearity in the power amplifier output. A first or driver stage biased in a near-A region with low distortion is cascaded with a second or power stage biased in a near-C region with high efficiency. The amplitude and phase responses of the two stages compensate another to yield a more linear overall gain for the overall power amplifier. The dynamic biasing scheme modulates the source to drain voltages of the transistors used in the amplifier stages based on the harmonics in amplifier output in order to minimize the harmonics and correct non-linearity in the output.

High efficiency linear microwave power amplifier

A compact amplifier output bias circuit is used as a broadband harmonic termination. The bias circuit is adapted as a harmonic termination circuit to produce an effective low impedance or act as a load at the signal harmonic frequencies while having the capability of supplying DC power to the amplifier stage, optionally, if needed. A pi network is coupled to an active device output and provides a low impedance at frequency bands above a frequency band of operation while allowing DC bias to be appliable to the active device output.

Harmonic termination circuit for medium bandwidth microwave power amplifiers

A compact amplifier output bias circuit is used as a broadband harmonic termination. The bias circuit is adapted as a harmonic termination circuit to produce an effective low impedance at the signal harmonic frequencies while having the capability of supplying DC power to the amplifier stage, optionally, if needed. A pi network is coupled to an active device output through a predetermined length of transmission line tuned for optimum power added efficiency in the frequency band of operation and provides a low impedance at frequency bands above the frequency band of operation while allowing DC bias to be appliable to the active device output.

A planar inverted-F antenna (PIFA) to facilitate communications within a plurality of frequency bands is disclosed. The top plate of the PIFA is placed at a predetermined height above a ground plane and shorting pins are placed in contact between the top plate and the ground plane. The feed pin is placed a predetermined distance away from each of the shorting pins within the interior area of the top plate. The shorting pins provide the ability to tune the PIFA to achieve either class-F or inverse class-F impedances over a wide range of frequencies. Also disclosed is an offset top loaded monopole (TLM) in which the feed pin connected to the top plate is offset from the centre of the top plate to provide a desired impedance.

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Seattle, WA, United States of America

Grant Andrew Ellis