Test and Measurement Channel

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With the continually increasing complexity of digital modulation techniques employed in wireless and satellite communications systems, instruments that accurately generate and maintain a set level of bit energy-to-noise density ratio (E b /N o ) have become valued tools in optimizing bit-error rate (BER) performance. These instruments have been...

The humble signal generator has come out of its modest, functional shell and taken on a streamlined, compact, state-of-the-art persona with the development of the 3410 series. This family of digital RF signal generators has evolved in response to the worldwide growth of second- and third-generation wireless communications systems...

Test applications that require microwave power from 1 to 18 GHz are usually addressed by two amplifiers, a solid-state unit to cover the low frequency range and a traveling-wave tube amplifier (TWTA) for the higher range. The input signal must be switched between the two amplifiers and, if there...

Voltage-controlled surface acoustic wave (SAW) oscillators (VCSO) have been used for many years in both commercial and military applications. The low phase noise allows frequency multiplication to higher frequencies for use as sources, such as local oscillators in radar and other microwave systems. The excellent tuning linearity provides outstanding...

As the complexity of wireless systems grows and requirements become more demanding, the task facing analog/RF engineers is not getting any easier. In today's rapid-paced working environment, time-to-market demands accurate and fast results from device simulations. To meet these demands for the effective management and analysis of design data...

CST MICROWAVE STUDIO® Version 4 (CST MWS) is a major new release of the company's flagship 3D EM microwave modeling and design package. Over 1400 changes, enhancements and new features have been added to make this already powerful tool truly comprehensive and an invaluable resource. The microwave design engineer...

Noise is a limiting factor for sensitive reception. In recent communication receivers, noise, along with many external factors, including intermodulation, reciprocal mixing and spurious response, may disturb the sensitive reception of the desired signal. Thus, much consideration for the noise and other factors that disturb the signal reception and...

Microwave sensors are increasingly finding commercial applications, particularly in the automotive industry. Here, advanced features are used to distinguish vehicles, while safety is a major consideration in new car purchases. Therefore, it is not surprising that radar technology has been adopted and implemented in adaptive cruise control (ACC) systems....

Technical Feature Q- and V-band MMIC Low Noise Amplifiers This article describes MMIC low noise amplifiers for millimeter-wave applications using 0.15 µ m pHEMT technology. The design emphasis is on the active device model. The deficiency of conventional device models is identified. A distributed device model has been adapted...

Technical Feature A 2.4 GHz Polarization-diversity Planar Printed Dipole Antenna for WLAN and Wireless Communication Applications This article presents the design simulation, fabrication and measured performance of a 2.4 GHz polarization-diversity printed dipole antenna for wireless communication applications. Two orthogonal printed dipole antennas, each with a microstrip via-hole balun...