RF & Microwave Industry News

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Performance, cost and size are key to mobile phone design. Improved performance, lower cost and ever-shrinking module size parameters are universal challenges in the competitive world of mobile phone manufacturing. Over the past four years steady improvements have been made in power amplifier efficiency. Prices have likewise dropped. Yet...

Filtronic Compound Semiconductor has created a new line of power PHEMT devices designed for infrastructure applications. These devices are useable at frequencies from 900 MHz cellular through 3.5 GHz WLL applications. The use of PHEMT technology results in power FETs with superior performance in ACPR and efficiency, both critical...

Power, efficiency, linearity: pick any three — such a choice just about summarizes the challenges presented to the power amplifier (PA) designer in 2005. As wireless systems pack more data into limited bandwidths, power amplifiers carry a bigger burden but are still required to be efficient. Simultaneously, in order...

There are some fundamental basics on two-port network models. Microwave amplifiers, like the one depicted in the block diagram of Figure 1 , have been traditionally designed with scattering parameters with a goal of power gain over some prescribed bandwidth. This model format is justified because, at high frequencies,...

High power broadband amplifiers are a crucial element for a variety of defense electronics and telecommunication systems. However, the product of power and bandwidth is fixed for a specific amplifying device, that is, the broader the bandwidth, the less the output power. Hence, a variety of broadband power combining...

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...

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...

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...

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...

Raytheon Co. has been awarded a $151.3 M contract from the US Army Aviation and Missile Command to provide engineering services support to the Patriot air and missile defense program. The award to Raytheon’s Integrated Defense Systems (IDS) provides funding for the first of four, one-year options, to last...