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Crane Aerospace & Electronics used Flomerics' Flotherm thermal simulation software to develop an unusual heatsink that works in the vertical or horizontal orientation. The heatsink is for a DC power subsystem for a commercial airliner. Developing an entirely new heatsink geometry that would have met the performance requirements would...

A pioneering navigation device which can tune into different satellite networks around the world is being developed by researchers at De Montfort University (DMU) Leicester, UK, in partnership with Nottingham Scientific Ltd. (NSL). NSL specializes in the commercial exploitation of Global Navigation Satellite Systems (GNSS) technology. Satellite navigation receivers...

This editorial is directed on the surface toward the specific question of why a microwave engineer should join the IRE Professional Group on Microwave Theory and Techniques. It is impossible to answer this question unless the reader is convinced of the worth of professional societies in general. The writer...

In order to improve the simulation accuracy of microwave circuit designs, an accurate active device model plays an important role for circuit simulations. According to previous studies, the BSIM models can precisely predict the characteristics of deep sub-micron MOSFETs at operation frequencies below 1 GHz for digital and analog...

The wireless and satellite communications communities have always been looking for power efficient radios. However, the power efficiency is greatly dominated by the efficiency of the RF power amplifier (PA) in the transmitting path. Recently, most of the communication systems being deployed or to be deployed in the near...

Personal wireless communications have recently gained wide popularity. Presently, the trend is to provide a wireless link to every kind of electronic device. In particular, there is a specific need for greater capacities and transmission speeds, which, together with a growing demand from users for more complicated services, require...

Microwave power devices, widely used in modern wireless and communications systems, must operate in a nonlinear mode in order to operate efficiently. Nonlinear operation means that the only valid way to test them is under actual operating conditions of DC bias, RF power and impedance. Small-signal S-parameters are not...

The hybrid ring has been widely used in microwave systems, due to its simplicity and performance. Because of the long electrical length of the ring itself, size reduction is becoming a major design consideration for many practical applications. Furthermore, when designing a microwave system, how to effectively handle the...

Mismatch uncertainty is a very common and often underestimated source of error in microwave power measurements. It arises from an incomplete knowledge of the phase of the reflection coefficients of the source and load impedances, plus their interconnection, and is usually a large component of the overall measurement uncertainty...

Electromagnetic (EM) simulation provides accuracy at the expense of speed. In situations where accuracy is crucial and the problem size large, such as compacting an RFIC or complex RF board onto a small area to meet cost and size requirements, simulation times can be unbearably long. When each simulation...