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In late June this year, the US Department of Defense (DoD) announced that fatalities from roadside bomb attacks in Iraq had dropped by nearly 90 percent over the previous year. In May of this year, improvised explosive devices (IED) claimed the lives of 11 US troops. Compared to the...
This article briefly outlines the research and development activities in radar absorbing materials. First, the structure and working mechanism of traditional radar absorbing architectures such as the Salisbury screen and the adaptive radar absorber are introduced. Second, the major breakthroughs, including the successful fabrication of dynamically radar absorbing materials,...
Modern radars using frequency chirp modulation present many measurement challenges to the designer and system engineer. Complex test systems involving many instruments have traditionally been required to validate radar performance. Automatic measurements in a single instrument can be the key to simplifying radar test and improving test reproducibility. This...
Many forms of data transmission utilize various forms of Automatic Repeat reQuest (ARQ), where data which has not been received or correctly decoded is automatically requested. This guarantees delivery of the full packet of data, for instance to make sure that the whole web page is displayed. When data...
I. INTRODUCTION The availability of low-cost, high performance amplifiers is crucial to the continued development of mm-wave commercial applications from 17 to 40 GHz. Typical applications include wireless data links such as Local Multipoint Distribution Service (LMDS) and point-to-point microwave radio as well as automotive 24GHz, instrumentation, and VSAT...
1. INTRODUCTION CDMA (IS-95) has a multiple access scheme based on spread spectrum technology, which has been applied to digital cellular mobile communications since the early 1990s. The number of traffic channels used depends on the number of users in the cell. Thus the output signal of the IS-95...
The intense pressure on wireless service providers to reduce cost at every level while maintaining or even increasing performance has produced some notable achievements. One of the most impressive is in LDMOS RF power transistors, which today deliver higher RF power, gain and efficiency than their predecessors. Although perhaps...
In response to increased X-band communications requirements, Locus Microwave has developed a 5 or 10 W miniature Block Upconverter (BUC). The UB61000-037/-040 provides a cost-effective, compact and rugged solution for a variety of X-band communications needs including commercial, military and military Manpack SATCOM systems. This unit features an L-band...
During World War II, RF and microwave systems proved to be of major importance for both communication and radar. Consequently, intensive research was conducted in this field, resulting in major breakthroughs. The introduction of novel communication and sensing equipment continued after the war for both military and civilian applications....
One of the scarcest commodities in this country today is space in the radio spectrum. The increasing requirement for broadcasting services, public and private communications, aircraft guidance, military applications and a thousand other uses of the radio spectrum has created a demand for available frequencies that far exceeds the...
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