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Amplifier Filter Design Software

Texas Instruments (Dallas, TX) has introduced the FilterProTM v3.0 design tool with an improved user interface and a more accurate and robust filter design engine. It can adjust passive element tolerances and view response variations, scale passive component values, and view and export filter performance data to Excel. The tool allows designers to create and edit designs using the Filter Design Wizard. Users can design multiple feedback (MFB), Sallen-Key, low-pass, high-pass, band-pass, and bandstop filters using voltage feedback op amps. The software supports Bessell, Butterworth, Chebychev, Gaussian, and linear phase filter response types, and can be used to design filters from one to ten poles.

Posted in: Products, RF & Microwave Technology, RFM Catchall, RF & Microwave Electronics
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Wireless RF Remote Controller

Southco® (Concordville, PA) offers the EA-R01 wireless RF remote controller that controls access to multiple locked compartments from distances up to 100 feet. It features a waterproof potted construction and two sequenced 30-amp output channels to minimize load on the battery, while operating multiple latch points. Additional features include a light/horn output, simple transmitter programming, and labeled connections for system configuration. It is able to withstand vibration and temperature variations from -29 to 82 °C. The controller supports multiple electronic locks and up to four transmitters that can be added or deleted with a pushbutton learn feature designed into the receiver.

Posted in: Products, RF & Microwave Technology, RFM Catchall, RF & Microwave Electronics
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Adaptor Bracket

Times Microwave Systems (Wallingford, CT) offers the LP-BFDN-CW bulkhead-to-flange universal mounting and grounding adaptor bracket for its Times-Protect™ line of RF lightning and surge protection products. The adaptor is made of copper with white bronze plating. It accommodates both N- and DIN-type protectors, and allows for multiple protector installation and grounding options where bulkhead provisions are not available. It can be mounted on a flat, grounded surface; provision is also available for two-hole 1" and 5/8" grounding lugs for grounding protectors where a suspended installation is required.

Posted in: Products, RF & Microwave Technology, RFM Catchall, RF & Microwave Electronics
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Microwave Energy Transmission for Aircraft

Unmanned aerial vehicles, or UAVs, are used in many applications to gather intelligence without risking human lives. These aircraft, however, have limited flight time because of their reconnaissance payload requirements coupled with their limited scale. A microwave-powered flight vehicle would be able to perform a reconnaissance mission continuously.

Posted in: Articles, RF & Microwave Technology, RFM Catchall, RF & Microwave Electronics, Antennas, Data exchange, Radar, Unmanned aerial vehicles
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Outdoor Synthetic Aperture Acoustic Ground Target Measurements

A novel outdoor synthetic aperture acoustic (SAA) system consists of a microphone and loudspeaker traveling along a 6.3-meter rail system. This is an extension of a prior indoor laboratory measurement system in which selected targets were insonified while suspended in air. Here, the loudspeaker and microphone are aimed perpendicular to their direction of travel along the rail. The area next to the rail is insonified and the microphone records the reflected acoustic signal, while the travel of the transceiver along the rail creates a synthetic aperture allowing imaging of the scene.

Posted in: Briefs, Physical Sciences, Measurements, Acoustics, Test equipment and instrumentation
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Portable, Rapid-Test Fuel Tank Leak Detection System

In 1988, the EPA issued Underground Storage Tank (UST) regulations for fuel storage in order to implement monthly monitoring and annual tightness testing. Monthly monitoring requires that the leak detection system be certified for a leak rate of 0.2 gallons per hour (GPH), and annual tightness testing requires a certified leak rate of 0.1 GPH, both with a probability of detection of at least 95%, and a probability of false alarm of no more than 5%. The DoD owns and operates hundreds of underground storage tanks that are less than 100,000 gallons. These tanks, commonly operating at base fuel farms, must comply with EPA, state, and local regulations, and require that either an annual tightness test with monthly inventory reconciliation or monthly monitoring tests be conducted in accordance with published performance standards. Existing technologies either cannot meet performance standards for the large 50-K to 100-K gallon USTs or do not provide a cost-effective solution. The Portable Rapid Test (PRT) is designed and recommended for testing tanks containing lower-volatile, heavier-type fuels such as diesel, JP-5, JP-8, etc.

Posted in: Briefs, Physical Sciences, Defense industry, Fuel tanks, Certification, Inspections, Test procedures
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Ballistic Filter for GPS and Accelerometer Measurements

Ballistic filtering describes the dynamic equations that can be used to form Extended Kalman Filters (EKF) for the estimation of a projectile’s trajectory. The steps associated with initialization and implementing an EKF are demonstrated through a specific task. The performance of an EKF processing Global Positioning System (GPS) observation is compared to the performance of an EKF processing both GPS and axial accelerometer observations. Hit point prediction error is used as the measure of effectiveness. Both filters use the same dynamics for state and covariance propagation.

Posted in: Briefs, Information Technology, Trajectory control, Mathematical models, Measurements, Global positioning systems, Global positioning systems (GPS), Military vehicles and equipment
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Procedure to Determine and Correct for Transmission Line Resistances for Direct-Current, On-Wafer Measurements

Resistances of tenths of ohms to several ohms in transmission lines have been measured in laboratory systems from the power supply to the device under test (DUT). High-current semiconductor devices may draw currents of several amps. In cases such as these, the voltage drop in the transmission lines may rise up to several volts. In order to properly characterize the DUT, the losses in the transmission line and the voltage drop across the line must be measured and accounted for. A procedure for measuring the transmission line resistances is described. Once these values are known, it is necessary to apply a transform to the raw measured data in order to determine the actual voltages on the device of interest. A simple MATLAB code for determining the DUT current and voltage behavior is presented when the raw IV data and the transmission line resistances are known.

Posted in: Briefs, Electronics & Computers, CAD / CAM / CAE, Measurements, Wiring, Semiconductors
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Channel Field Effect Transistors

Narrow bandgap semiconductors offer high carrier mobilities and low contact resistances, while wide bandgap semiconductors offer high breakdown voltages. A series of heterojunction transistors has been investigated and proved to be effective for improving both speed and power output. These devices include double heterostructure InP/InGaAs/InP bipolar transistors and composite-channel InAlAs/InGaAs/lnP/InAlAs high-electron-mobility transistors (HEMTs), which have taken full advantage of the matched lattice constant (or pseudomorphic growth).

Posted in: Briefs, Electronics & Computers, Architecture, Transistors, Semiconductors, Performance tests
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Self-Aware Computing

This project performed an initial exploration of a new concept for computer system design called Self-Aware Computing. A self-aware computer leverages a variety of hardware and software techniques to automatically adapt and optimize its behavior according to a set of high-level goals and its current environment. The heart of a complete self-aware system is a new “organic” operating system (OOS). The OOS acts as the ringleader, monitoring applications and making adjustments to hardware and software to increase performance, efficiency, and reliability automatically.

Posted in: Briefs, Electronics & Computers, Artificial intelligence, Computer software / hardware, Product development, Research and development
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