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JUNE 2004 | |
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June 2004 - In This Issue [Cover Story] Low-Noise VCOs Conquer Wide Bands Bandwidth and phase noise are two of the leading requirements for signal-generating components in modern communications equipment. Voltage-controlled oscillators (VCOs) have been the frequency source of choice for many wired-, wireless-, and... — Ajay Kumar Poddar , et al. [News] Narda Microwave Celebrates 50 Years Fifty years ago, Narda Microwave became a corporation. What began as a self-funded experiment in starting a business between three engineers and a businessman has transformed over time into one of the most trusted names in the microwave industry. Very... — Jack Browne [News] Meeting The Needs Of Homeland Security Homeland security has been on the minds of most Americans since the terrorist destruction of New York's World Trade Center on September 11, 2001. Although terrorism was a source of fear in Europe and the Far East long before that tragic day, the... — Jack Browne [Design Features] Antenna Snares GPS/WLAN Signals High gain is not usually associated with a compact antenna. For satellite-communications applications, however, an antenna design must be small and light, yet provide pattern shaping, wide bandwidth, and polarization purity. In developing an antenna... — Dr. Jamal S. Izadian [Design Features] Refined I/Q Imbalance Measurements Phase modulation is the basis for many modern mobile telecommunications formats, including IS-136 and GSM. Using in-phase (I) and quadrature (Q) signal components, modulation is commonly generated by means of an analog I/Q modulator. Since variations... — Gabor Zoka [Design Features] Design Considerations For Microwave RF Repeaters Microwave on-frequency RF repeaters are commonly used by telecommunications system operators to reliably and cost-effectively relay radio signals at remote locations, typically mountaintops and when bypassing obstructed paths. Understanding the use of... — Edward R. Johnson [Product Technology] Fast Synthesizers Switch 5 MHz To 20.48 GHz Speed and silence are the trademarks of a high-quality microwave frequency synthesizer, and two of the outstanding attributes of the Series DS frequency synthesizers from Herley Communications Techniques, Inc. (Whippany, NJ). The single-enclosure... — Adrian Lalicata [Product Technology] Comparator Measures Frequency And Phase Measurement of fractional differences in frequency and phase is often useful for evaluating sets of oscillators, precise lengths of cables, and other sets of high-frequency components. The model A7-X is an improved version of a proven frequency/phase... — Jack Browne [Editorial] MEMS Make Noise At MTT-S "Experimental" technologies are often slow to gain ground among high-frequency engineers. For example, high-electron-mobility-transistor (HEMT) devices, which are commonplace today, were used by only the most courageous of engineers during the early... — Jack Browne |
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