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Industry News

Transceiver Duplexer Design Considerations

The transceiver duplexer is a key element in avionics systems, radars, antenna arrays and wireless communication systems. The duplexer provides protection of the receiver and transmitter from unwanted parasitic signals. This article discusses several duplexer schematics, their development flow and a trade-off design. Duplexer Schematics An RF transceiver duplexer...
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Microwaves in Europe: Historical Milestones and Industry Update, Part II

Part I of this report last month focused on individual countries and their contributions and achievements related to the microwave industry. But the continent as a whole plays a key role in all sectors including industrial, biomedical, military, aerospace and emerging wireless technologies. Since there is such a broad...
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An Approach for Determining MOSFET Small-signal Circuit Model Parameters

A simple method for the extraction of the small-signal model parameters of a MOSFET is proposed. The intrinsic elements determined are described as functions of the extrinsic resistances. The parasitic elements are iteratively determined using the variance of the intrinsic elements as an optimization criterion. Good agreement is obtained...
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Wideband 400 W Pulsed Power GaN Amplifier

A 400 W pulsed output power GaN HEMT amplifier operating over the 2.9 to 3.5 GHz band (17 percent bandwidth) has been developed. Under pulsed RF drive, with 10 percent duty cycle and 100 µs pulse width, the amplifier delivers an output power in the ran...
The high power and wide bandwidth potential of GaN HEMT devices is well known. 1 RFMD has been developing high power amplifiers using GaN HEMTs for various applications. A 250 W amplifier in the 2.14 to 2.5 GHz band for wireless infrastructure applications in the WCDMA and WiMAX bands...
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Low Frequency 3-D Electromagnetic Analysis of Anechoic Chamber Performance

The advantages of anechoic chambers utilized for antenna measurements, as compared with conventional outdoor antenna test ranges, such as security, interference-free radiation and immunity to weather, are well known. Typical anechoic chambers comprise a shielded enclosure with the internal metallic surfaces covered by absorbing materials, a source antenna to...
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A Compact CPW-fed Rectangle-trapezoid-rectangle Shaped Monopole Antenna for Ultra-wideband Systems

A novel CPW-fed rectangle-trapezoid-rectangle shaped monopole antenna composed of a trapezoid and two rectangles is presented. In this context, the flat monopole structure improves the impedance bandwidth and reduces the size of the antenna dramatically. The ultra-wideband (UWB) antenna design plays a role as a filter. The coplanar waveguide...
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Mimix SmartSets: Complete QFN Chipset Solution

Sustained growth in wireless communications and greater demands for bandwidth place tremendous pressure on component manufacturers to provide high performance, surface-mount technology (SMT) packaged products. The market is seeking low-cost, standard SMT components for high volume printed circuit board (PCB) assembly flow, in particular for applications such as point-to-point...
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