Viasat, Inc.

The University of North Carolina at Charlotte

Konrad Miehle

Dean Lawrence Cook

David E Pettit

Alberto Rodriguez

Fonzie K Sanders

Thomas Paul Weldon

Bobby D Anderson, Ii

Ryan S Adams

Bobby D Andersen, Ii

Bobby D Anderson Ii

The present disclosure describes systems and devices for gain slope equalization in a radio frequency (RF) amplifier. The RF amplifier may include an input stage for receiving an RF signal. In conjunction with the input stage, the RF amplifier may incorporate an amplification stage to amplify the RF signal. Coupled with the amplification stage may be a transformer including a first winding to receive the amplified RF signal, a second winding providing an RF output signal, and a resonator including a third winding that is coupled to the first and second windings. The resonator may be coupled to a circuit network which may be tuned to affect the resonance frequency and the gain slope of the RF output signal.

Amplifier with integrated gain slope equalizer

Systems and methods are provided for implementing a phased array antenna having a boresight direction. A scan angle within a defined range of scan angles is selected for the phased array antenna such that the selected scan angle is different from a scan angle associated with the boresight direction. An antenna port impedance associated with each of a plurality of antenna elements comprising the phased array antenna varies with the scan angle of the phased array antenna. A plurality of amplifiers are each coupled to an antenna port of one of the plurality of antenna elements. Each of the plurality of amplifiers is configured such that a maximum value for a performance characteristic of the plurality of amplifiers is achieved when an impedance at the antenna port corresponds to the selected scan angle.

Phased array antenna system

The present disclosure describes systems and devices for gain slope equalization in a radio frequency (RF) amplifier (). The RF amplifier () may include an input stage () for receiving an RF signal. In conjunction with the input stage (), the RF amplifier () may incorporate an amplification stage () to amplify the RF signal. Coupled with the amplification stage () may be a transformer () including a first winding to receive the amplified RF signal, a second winding providing an RF output signal, and a resonator including a third winding that is coupled to the first and second windings. The resonator may be coupled to a circuit network which may be tuned to affect the resonance frequency and the gain slope of the RF output signal.

A metamaterial simultaneously exhibiting a relative effective permeability and a relative effective permittivity below unity over a wide bandwidth, including: one of a two-dimensional and a three-dimensional arrangement of unit cells, wherein each of the unit cells has a magnetic dipole moment and an electric dipole moment that are dependent upon one or more of an incident magnetic field and an incident electric field; and a coupling mechanism operable for coupling one or more of the incident magnetic field and the incident electric field to one or more devices. Optionally, the coupling mechanism includes one or more of a split ring and a pair of parallel plates coupled by one of a rod and a wire. The one or more devices are non-Foster elements.

Wideband negative-permittivity and negative-permeability metamaterials utilizing non-foster elements

The present disclosure, for example, relates to one or more techniques for linearizing a signal in a communications system. An input signal may be obtained at a beginning of a signal path of a radio frequency (RF) communication device. The RF communication device may estimate subsequent distortion of the input signal due to the signal path. The estimated distortion may include estimated phase distortion and estimated amplitude distortion of the input signal. The RF communication device may adjust phase and amplitude within the signal path to compensate for the estimated phase distortion and the estimated amplitude distortion to produce an adjusted signal. The phase within the signal path of the input signal may be adjusted separately from the amplitude within the signal path of the input signal. The RF communication device may generate a linearized signal at an end of the signal path based at least in part on the adjusted signal.

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Mesa, AZ, United States of America

Konrad Miehle