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Remote sensing is a multi-disciplinary activity that deals with the inventory, monitoring and assessment of natural resources, following the analysis of data obtained through observations from a remote platform. This technology, under development since the early 1960s, has shown great promise in improving the information collection regarding the world’s...

The requirement for increased data rates in modern radio systems has led to higher order modulation schemes which, in turn, demand oscillators with lower phase noise. Meanwhile, manufacturers must also deliver low cost solutions covering many different frequency bands. These two criteria have generally been incompatible, since an improvement...

Industry News Teledyne Technologies Inc. and Celeritek Inc. jointly announced that Teledyne, through its subsidiary Teledyne Wireless Inc., has completed the acquisition of Celeritek’s defense electronics business for $33 M in cash. Celeritek’s shareholders approved the asset sale at the company’s annual meeting. Wireless Telecom Group Inc. (WTT) announced...

Installation of WLAN data links has become commonplace whether within an industrial site, commercial establishment, or home use in both the 2.4 and 5 GHz bands involving 802.11 a, b, and g. Bantam Instruments’ Model 425A wireless LAN spectrum analyzer pushes the limits in frequency range, price and performance...

Tunable notch and bandpass filters can be very cost-effective in high frequency measurement and communications applications, especially when it is necessary to frequently change notch or bandpass frequencies. The alternative is to have available a large number of filters for discrete frequencies that must be manually swapped in and...

Microwave signals play an important role in modern communication architectures and radar applications. Used as carriers and signals for up and down conversion they have to comply with certain quality standards. The most important two are frequency drift, which is a measure of the long-term frequency stability, and phase...

Low power wireless sensors are receiving considerable attention due to their multiple applications in the commercial and military scenarios. Wireless networks of “power aware” smart sensors are being developed that are deployed and forgotten, 1 as well as the sensor elements themselves. Transducers integrated with radio transceivers and networking...

The fast growing demand for microwave communication technologies, such as broadband wireless and satellite communication, point-to-point radio links, as well as a variety of radar systems, brings up stringent requirements to modern microwave filter design techniques aimed at minimization of electromagnetic interference, cross talks and jamming. The most critical...

High efficiency microwave amplifiers with low supply voltages are required for mobile telecommunications services, such as GSM or DCS1800 systems. Theoretically, class-F power amplifiers (PA) can achieve 100 percent drain efficiency by maximally flattening the voltage and current waveforms of the active device. 1 By increasing the efficiency of...

As discussed in part one of this article, the measurement of very good VCOs at large frequency offsets is limited by the spectrum analyzer’s dynamic range. This limitation can be overcome by using carrier filtering and selective amplification of noise at the offset frequency of interest. The bandpass filter...