Patent
Voltage tunable laminated dielectric materials for microwave applications
Luna H. Chiu,Yongfei Zhu,Xubai Zhang,Steven C. Stowell,Andrey Kozyrev,Somnath Sengupta,Louise C. Sengupta +6 more
TLDR
A tunable dielectric structure as discussed by the authors consists of a first layer, a second layer, and electrodes for applying a controllable voltage across the first layer of dielectrics, where at least one of the electrodes is positioned between the first and second layers.Abstract:
A tunable dielectric structure includes a first layer of dielectric material, a second layer of dielectric material positioned adjacent to the first layer of dielectric material, with the second layer of dielectric material having a dielectric constant that is less than the dielectric constant of the first layer of dielectric material, and electrodes for applying a controllable voltage across the first dielectric material, thereby controlling a dielectric constant of the first dielectric material, wherein at least one of the electrodes is positioned between the first and second layers of dielectric material. The dielectric materials can be formed in various shapes and assembled in various orientations with respect to each other. The tunable dielectric structure is used in various devices including coaxial cables, cavity antennas, microstrip lines, coplanar lines, and waveguides.read more
Citations
More filters
Patent
Tunable microwave devices with auto-adjusting matching circuit
TL;DR: In this article, an impedance matching circuit includes a conductor line having an input port and an output port, a ground conductor, a tunable dielectric material positioned between a first section of the conductor line and the ground conductor and means for applying a DC voltage between the ground and the strip conductor.
Patent
Adaptively tunable antennas incorporating an external probe to monitor radiated power
TL;DR: In this paper, the authors present an apparatus, comprising an adaptively-tuned antenna including a variable reactance network connected to the antenna and an RF field probe located near the antenna, an RF detector to sense voltage from the field probe, a controller that monitors the RF voltage and supplies control signals to a driver circuit.
Patent
Tracking apparatus, system and method
TL;DR: In this paper, the authors present an apparatus capable of tracking a target, comprising at least one near-field focused antenna comprising an array of elements and a phase shifter to form multiple fixed beams in the near field, a sensor capable of sensing the location of the target, and a controller capable of accepting position information and capable of activating the proper fixed beam along a course.
Patent
Method and apparatus for tuning a communication device
TL;DR: In this paper, a non-transitory computer-readable storage medium including computer instructions to obtain at least one operational parameter associated with a communication device and adjust a steerable antenna of the communication device when the device does not satisfy an impedance threshold, where the satisfying of the impedance threshold is determined based on the at least operational parameter.
Patent
Antenna system and method
TL;DR: In this paper, the authors present an antenna system, comprising a plurality of non-uniformly spaced antenna elements arranged substantially linearly, a power divider for dividing transmit power thereby coupling signals to the plurality of antenna elements, a phase shifter capable of phase shifting the signals between the power dividers and the antenna elements such that radiated signals from each antenna element add coherently such that the radiated electromagnetic energy may be focused at a focal point in the near field region or in the Fresnel region of the antenna system.
References
More filters
Patent
Ceramic ferroelectric composite material - BSTO-MgO
TL;DR: In this article, a novel ceramic ferroelectric material having a low dielectric constant, extremely low loss and high tunability was proposed, which is a composite consisting of Barium Strontium Titanate (BSTO) and a ceramic material.
Patent
Multilayered ferroelectric composite waveguides
TL;DR: In this article, a multi-layer Ferroelectric composite waveguide is proposed to reduce the effective dielectric constant of the waveguide while maintaining tunability, where bias plates are placed perpendicular to the laminate direction on direction of film deposition to maintain tunability.
Patent
Tuneable microwave devices including fringe effect capacitor incorporating ferroelectric films
TL;DR: In this paper, a tuneable fringe effect capacitor for conducting radio frequency energy is proposed, which includes a thin film of ferroelectric material, a pair of films of a conductive material deposited on the ferro-electric film with a gap between the films, and a substrate for the material and the conductive films.
Journal ArticleDOI
Voltage-controlled ferroelectric lens phased arrays
J. Rao,D.P. Patel,V. Krichevsky +2 more
TL;DR: In this paper, a voltage-controlled ferroelectric lens was proposed to reduce the number of phase shifters from (n/spl times/m) to (n+m).
Patent
Ceramic ferroelectric composite material-BSTO-magnesium based compound
TL;DR: In this article, a composite material consisting of Barium Strontium Titanate (BSTO) and a magnesia compound selected from the group consisting, MgZrO 3, MgAl 2 O 4, and MgTiO 3 is presented.