US Government As Represented by the Secretary of the Army

Radio Frequency Systems, Inc.

Other

William C Drach

Thomas E Koscica

Richard W Babbitt

Arthur Tauber

Steven C Tidrow

Donald W Eckart

William D Wilber

Robert D Finnegan

Andrew M Singer

Dale M DiDomenico

Dale M Didomenico

Michael Tadross

Mark Bates

Rare earth metal containing compounds of the formula SrYbSbOhave been prepared with high critical temperature thin film superconductor structures, and can be fabricated into a superconductor insulator superconductor step edge Josephson junction, as well as being used in other ferroelectrics, pyroelectrics, and hybrid device structures.

Rare earth metal compounds for use in high critical temperature Josephson junctions

Rare earth metal containing compounds of the formula SrLuSbOand SrLaSbOhave been prepared as high critical temperature thin film superconductor structures, and can be used in other ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.

Rare earth metal compounds for use in high critical temperature thin film super-conductors

Rare earth metal containing compounds of the general formula SrRESbO, wherein RE is a rare earth metal, have been prepared as dielectric substrates and buffer layers in thin film superconductor structures, and can be used in other ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.

Rare earth metal compounds for use in high critical temperature thin film structures for super-conductors, ferroelectrics, pyroelectrics, piezoelectrics, and hybrids

Rare earth metal containing compounds of the formula SrLuSbOhave been prepared with high critical temperature thin film superconductor structures, and can be fabricated into an antenna, as well as being used in other ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.

Rare earth metal compounds for use in high critical temperature thin film super-conducting antennas

Burnout resistance ferroelectric material is used in the feedback path of a microwave oscillator as a frequency control element. The ferractor has rapid broadband frequency tuning capabilities limited only by the speed of an external DC source.

Voltage tuned ferroelectric resonant oscillator

Rare earth metal containing compounds of the general formula Sr RESbO , wherein RE is a rare earth metal, have been prepared with high critical temperature thin film superconductor strucutures, and can be used in other ferroelectrics, pyroelectrics, piezoelectrics, and hybrid device structures.

Rare earth metal compounds for use in high critical temperature thin film super-conductors, ferroelectrics, pyroelectrics, piezoelectrics, and hybrids

An antenna control system is connected to an antenna in order to control the position of the antenna. The system includes a motor connected to the antenna for adjusting the position or vertical tilt angle of the antenna. A driver is provided for operating the motor. A sensor is also provided to detect the position of the antenna. In addition, an antenna controller is connected to an antenna memory, the driver, and the sensor, for reading the detected position of the antenna and for controlling the driver to adjust the antenna's position. A main controller is connected to the antenna controller for sending commands to and reading data from the antenna controller. In this manner, the main controller can interface with any number of antennas at a base station and control the position or down-tilt of each antenna. According to one embodiment of the control system, a user interface is also provided for entering commands to and reading data from the main controller. The interface can be provided at the base station or tower or at a remote location via, for example, modem. According to one embodiment of the invention the user interface is a laptop computer. A user or technician can then enter commands and monitor the position of the antennas from a remote location.

Remote tilt antenna system

A radar system has a transceiver and a ferroelectric phased array antenna. The antenna includes a plurality of radiating elements each connected to a ferroelectric phase shifter. The transceiver and the phase shifters are coupled for conveyance of radio frequency signals therebetween. A beam control computer calculates phase shifter control voltages which are applied to a beam correction computer. A temperature sensor is coupled to each phase shifter to provide feedback temperature values to the beam correction computer. A data table in the beam correction computer provides phase shifter correction voltages as a function of control voltage amplitudes and temperature values. The beam correction computer uses the data table in determining temperature corrected phase shifter control voltages which are applied to the associated phase shifters.

Radar system having a ferroelectric phased array antenna operating with accurate, automatic environment-calibrated, electronic beam steering

A phase shifter for electrically adjusting the down-tilt of an antenna, based on rotating at least one phase wheel having a specially shaped dielectric. Each phase wheel is rotatably mounted between a stripline and the metallic ground plane of a feed system for an RF signal communicating the RF signal between each element of the antenna and a common terminal. The dielectric distributed on each phase wheel is shaped so that as the phase wheel is turned mechanically, the amount of dielectric directly beneath the stripline and above the metallic ground plane either increases or decreases in some proportion to the amount (angular displacement) the wheel is turned. All the phase wheels used in a system can be arranged, oriented, and tractively coupled so as to rotate in synchrony under the action of a single drive, which may itself be driven by a stepper motor for accurate, fine control. The phase wheels provide for continuous adjustment of the down-tilt of an antenna without having to convert between rotational and linear motion in moving dielectric into or out of position between the stripline and metallic ground plane.

Continuously variable phase-shifter for electrically down-tilting an

Telecommunication systems and methods for driving a phased-array antenna ing a plurality of spaced antenna elements that radiate and receive a beam of radio frequency signals. Each of a plurality of ferroelectric phase shifters connect to a different one of the antenna elements. A signal processor system, having a receiver and a frequency synthesizer communicates with the phase shifters under the control of a data processor system. A joystick connects to the data processor system for permitting manual input of beam steering information thereto. The data processor system responds to the joystick inputs by controlling the relative phase shifts of the signals propagating in the ferroelectric phase shifters. The system further includes a temperature sensor circuit for sensing the temperature of each of the ferroelectric phase shifters. This temperature sensor circuit connects to the data processor system for inputting temperature information that the data processor system uses to calculate calibration error factors. The data processor system uses the joystick inputs and the calibration error factors to apply concurrent calibrated analog control voltages to the ferroelectric phase shifters for controlling their relative phase shifts. The joystick permits an operator to manually control the position of the beam in real time, or to effect automatic beam scanning and control the scanning rate.

Temperature calibration system for a ferroelectric phase shifting array

A ferroelectric phase shifting antenna array consists of a plurality of lrally spaced antenna patches which have respective ferroelectric components abutting an edge of each patch at a near central location on the edge to provide impedance matching. DC control power lines are connected to the center voltage null position of the resonant mode of the antenna patch. An Rf source is connected to the other ends of the ferroelectric components through quarter wave coupled lines which provides simultaneous impedance matching and DC isolation.

Ferroelectric phase shifting antenna array

A phase shifter having a single or monolithic ferroelectric material and a lurality of ferroelectric transmission lines formed thereon, each having a different effective physical length and associated delay or phase shift. The plurality of different lengths of ferroelectric transmission lines has a voltage source associated therewith for applying a predetermined bias voltage, resulting in a change in permitivity in the ferroelectric substrate material. The different lengths of ferroelectric transmission line formed on the single substrate have a predetermined relationship between their effective physical linear lengths. By selectively activating the different lengths of ferroelectric transmission line by applying a bias voltage in different combinations, a desired or predetermined phase shift is obtained. The single or monolithic ferroelectric substrate used greatly reduces the overall length of the ferroelectric phase shifter. Additionally, less complex drive circuits are needed relative to analog type ferroelectric phase shifters.

Single substrate planar digital ferroelectric phase shifter

A high voltage direct current power supply having feedback control and a tection circuit for maintaining a controlled, stabilized output voltage. An oscillator is coupled to a transformer which in turn is coupled to a voltage multiplier. A feedback control is coupled to the transformer and the voltage multiplier which provides feedback to the transformer for maintaining an accurate, stable output voltage. Coupled to the feedback control is a protection circuit which prevents the output voltage from exceeding a predetermined output voltage. Additionally, the protection circuit shuts down the power supply if a short circuit occurs at the output. In one embodiment, the voltage multiplier is comprised of a plurality of voltage doubler diode and capacitor pairs. The feedback control is comprised of a comparitor and a buffer which drives a transistor coupled to the primary of the transformer, which acts as a feedback loop. The protection circuit includes a J-K flip-flop.

High voltage direct current power supply with feedback control and

A system that provides an automated simultaneous measurement of the electal characteristics of a ferromagnetic material as a function of temperature and electric potential. The system utilizes a personal computer that interfaces with a DUT fixture through an interface measuring circuit that provides a means for remote control of the measurement process and insures a more timely and less manually intensive measuring process. The interface measuring circuit is composed of a temperature measuring circuit for measuring the temperature applied to the DUT, a capacitor measuring circuit for measuring the electric potential applied to the DUT, a high voltage power supply, a temperature plate power supply, a high voltage power supply driver, a digital voltage meter (DVM), and a DVM multiplexer. The system can utilize a humidity-free 'dry' chamber (i.e. a desiccation chamber) to insure that the measurements of the DUT are reliable and accurate.

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Tinton Falls, NJ, United States of America

William C Drach