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Information Technology

What is Pulse Shaping?

Pulse shaping, as it is done today, is an effort to fix fidelity issues caused by the transmitting amplifier and is accomplished by a combination of imperfect methods, most external to the amplifier. This article...

Briefs
Sensors/Data Acquisition

Ka-Band Front-End Monolithic Microwave Integrated Circuits (MMICs) and Transmit/Receive (T/R) Modules Testing

Gallium nitride monolithic microwave integrated circuit (MMIC) technology has superior performance in power amplifier applications.

Articles
Electronics & Computers

90° Hybrid Coupled Power Amplifier – Pros and Cons

Wireless communications is a broad market and PAs fill a wide array of those applications.

Articles
Communications

Solid-State Microwave Power Module

The MPM has uses in military aerospace applications.

Articles
Defense

Broadband 1.2- and 2.4-mm Gallium Nitride (GaN) Power Amplifier Designs

The US Army Research Laboratory (ARL) has been working with Raytheon to design efficient, broadband, linear, high-power amplifiers and robust, broadband, low-noise...

Articles
Aerospace

Compact Power Amplifier Solution for Electronic Warfare

Wolfspeed, a Cree company, provides field-tested silicon carbide (SiC) and gallium nitride (GaN) power and RF solutions. As a leader in wide-bandgap semiconductor technology, Wolfspeed...

Articles
Aerospace

GaN Breaks Barriers

The increasing demand for higher data rates in telecommunications and higher resolution in industrial systems is pushing the frequency of operation higher for the electronics that support them. Many of these systems...

Briefs
Photonics/Optics

High-Power Broadband Multispectral Source on a Hybrid Silicon Chip

For applications in manufacturing, remote sensing, medicine, military, and fundamental science, an ideal laser would have high output power and a diffraction-limited beam....

Briefs
Photonics/Optics

Stimulated Brillouin Scattering (SBS) Suppression and Long Delivery Fibers at the Multikilowatt Level with Chirped Seed Lasers

One obstacle in the scaling of high-power fiber lasers arises because of nonlinear effects (e.g., stimulated...

Articles
Defense

Cassini Stays in Touch with NASA's Radio Science Subsystem

After almost 20 years in space, NASA's Cassini spacecraft begins the final chapter of its remarkable story of exploration. From now until September, Cassini will undertake a set of...

Briefs
Photonics/Optics

Development of Photoacoustic Sensing Platforms

In recent years, photoacoustic spectroscopy (PAS) has emerged as an attractive and powerful technique well suited for sensing applications. The development of high-power radiation sources and...

Briefs
Test & Measurement

Angular Random Walk Estimation of a Time-Domain Switching Micromachined Gyroscope

The primary metrics that prohibit the use of microelectromechanical systems (MEMS) gyroscopes for navigation-grade inertial navigation units (IMUs) are angle...

Articles
RF & Microwave Electronics

Curled RF MEMS Switches For On-Chip Design

Microelectromechanical system (MEMS) switches are active components in most electronic equipment. Radio frequency (RF) MEMS are used in wireless personal communication devices, satellite...

Articles
RF & Microwave Electronics

Making AESA Radar More Flexible

A modular, building-block approach brings greater design flexibility to Active Electronically Scanned Array (AESA) radar technology, simplifying system integration, and permitting rapid first-line repair with no...

Articles
RF & Microwave Electronics

Enhance EMC Testing with Digital IF

Modern electromagnetic interference (EMI) receivers and spectrum analyzers used for compliance and precompliance testing employ digital intermediate-frequency (digital IF) processing technology for signal...

Articles
Defense

Unmanned Ground Vehicle Communications Relays

The need for a high-bandwidth communication link to carry multiple video channels from a mobile robot (unmanned ground vehicle, or UGV) back to a control station requires using high-frequency RF...

Articles
Defense

Solutions for RF Power Amplifier Test

As wireless mobile devices grow in capability and complexity, the associated growth in power demand is driving new approaches to battery utilization and power efficiency. One of the single largest power...

Articles
Defense

Electronic Warfare Technology

Military electronic warfare (EW) systems including navigation, radar guidance, terrain mapping and others, require lightweight compact components, with radio frequency (RF) output power levels to several...

Articles
Aerospace

New RF Strategies for Software Radio

Software defined radio system engineers can now exploit new technology to perform digital signal processing much closer to the antenna than ever before. Various strategies include the latest wideband data...

Articles
Defense

Optimizing DSP Techniques for Antenna Site Software Radio

Many applications can benefit from pushing software radio functions up the mast to the antenna as a viable alternative to traditional rack-mounted receiver systems. New technology...

Articles
RF & Microwave Electronics

RF FPGAs for Multi-Function Systems

A dynamically reconfigurable, wideband programmable RF FPGA transceiver will provide reduced lifecycle cost, reduced redesign cost, and service for multiple DoD platforms, while maintaining near-optimal...

Articles
Test & Measurement

Testing Modern Radios

Several techniques are now being employed to ensure efficient communications across the chaotic radio spectrum. Chief among them is Software Defined Radio (SDR), which uses software to dynamically control communications...

Articles
Weapons Systems

A Fundamental Key to Next-Generation Directed-Energy Systems

Imagine an explosive ordnance disposal (EOD) unit on a routine scouting patrol deep in the notorious “Triangle of Death” south of Baghdad, where marines, sailors, and soldiers...

Articles
Photonics/Optics

Laser Detection System Technology

While most ordnance is now laserguided, there is still much work to be done on the defensive detection of laser designators. Hence the growing need for advanced laser-warning systems (LWS). While multiple...

Application Briefs
Test & Measurement

Measuring Radar Cross Section with Handheld VNAs

Radar cross section (RCS) is the measure of an object's ability to reflect radar signals in the direction of the radar receiver, i.e. it is the measure of the ratio of backscatter per...

Briefs
Electronics & Computers

Development and Test of a Medium-Voltage Converter for Ocean Observatories

A critical component in regional-scale undersea power systems is the medium-voltage converter (MVC). The MVC is a DC-DC converter in the primary network...

Briefs
Electronics & Computers

Differential Amplifier Circuits Based on Carbon Nanotube Field Effect Transistors (CNTFETs)

Since their discovery, carbon nanotubes (CNTs) have been extensively studied for their great potential in a variety of applications. Several desirable properties that CNTs possess include a high thermal conductivity, high electrical mobility, high...

Briefs
Photonics/Optics

Power Enhancement of a Rubidium Vapor Laser with a Master Oscillator Power Amplifier

The concept of alkali lasers was first suggested by Schalow and Townes in the late 1950s. In the 1970s, photo-dissociation of several of the alkali salts produced lasers with wavelengths ranging from the visible to the far infrared. Thirty years later,...

Application Briefs
RF & Microwave Electronics

Analysis of On-Chip Heat Distribution in the Design of RF Power Detectors and Transistor Arrays

The simulation of electromagnetic (EM) and thermal properties of semiconductor and substrate materials has been demonstrated to be particularly...