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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...

The current drive for increased bandwidth will ultimately pressure the wireless community to exploit higher operational frequencies beyond 20 GHz. A major obstacle associated with high frequency operation is signal distortion which can be the result of nonlinear effects, typically introduced by active devices. Signal distortion resides on the...

Building on its strong background in the development and production of Helix travelling wave tubes (TWT) for military airborne applications, e2v has developed a ‘new generation’ of TWTs that expands upon established airborne decoy applications and anticipates future system requirements. Over the past 20 years the company has manufactured...

The third generation partnership project (3GPP) responsible for the universal mobile telecommunication systems (UMTS) 3G system has defined the high-level requirements for the next generation of cellular telecommunications services. These requirements include reduced cost per bit, increased service provisioning, flexible use of existing and new frequency bands, simplified architecture...

THE FIRST SYMPOSIUM sponsored and financed by, and designated as the Annual Meeting of the Professional Group on Microwave Theory and Techniques of the Institute of Radio Engineers, was held at the Western Union Auditorium in New York City on May 9 and 10, 1957. However, from the formation...

Modern complex modulation schemes have the disadvantage of requiring linear power amplification characteristics, which compromises overall system efficiency because RF power amplifiers (RFPA) are much less efficient when operating in the linear region than they are at maximum power. The power amplifier and its associated components consume up to...

The following booth numbers are complete as of April 8, 2008. Heavy Wall Waveguide A-Alpha Waveguide offers heavy wall WR62, WR75, WR90, WR137, WR159, 6061 aluminum waveguide tube as well as WR62, WR75, WR90, WR112, WR137, WR187 heavy wall OFHC copper waveguide tube. These sizes along with all standard...