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Industry News

Design of Linear S-band Power Amplifiers with High Power-added Efficiency

In wireless communications, linearization of the PA is sometimes required to ensure high quality of the modulated signal and maintain good PAE. PA linearization using a feed-forward technique 1–4 can be very tedious and time consuming. Without PA linearization, an approach to achieve high power and good PAE is...
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A Four-channel Full-duplex T/R Module for Multi-frequency Phased Array Applications

This article presents a broadband transmit/receive module for multi-frequency phased array applications. The T/R module transmits at 10 and 19 GHz and receives at 12 and 21 GHz. The module consists of two novel harmonic-suppressed microstrip multiplexe...
Rapid progress in telecommunication and radar technology is placing increasing demands on wireless system performance. Such demands include high information capacity and the ability to track multiple mobile targets or users. 1–3 Military research programs in particular are placing heavy emphasis on Network Centric Warfare, a wireless network concept...
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A Unified Theory for Nonlinear Distortion Characteristics in Different Amplifier Technologies

This article presents a unified theory of power amplifier nonlinear distortion characteristics under small- and large-signal regimes for a wide range of active device technologies. It shows that some handy interactions between mild and strongly nonline...
RF power amplifiers (PA) are the last active blocks in any wireless transmitter system, handling the highest levels of RF signal and supply power. Linearization enforcing techniques relying on either adding external circuitry to the PA, or simply improving its design, 1 are thus necessary. However, since the first...
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Northrop Grumman Demonstrates Moving Target Engagement

Northrop Grumman Corp. recently performed successful high speed captive flight tests of its multi-mode, air-to-ground terminal guidance seeker during moving-target engagement exercises at Eglin Air Force Base. The exercises, conducted by the US Air Force Research Laboratory, in cooperation with Northrop Grumman, the Boeing Co. and Rockwell Collins, successfully...
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