Industry News

A Software Suite to Aid Workflow

All companies need to see increasing income year on year to please investors and to fund their growth. A mounting need for microwave design, combined with skilled worker shortages, make seamless growth challenging. As a result, engineers in rapidly growing companies are faced with increased workloads, more diverse work...
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Improvements to Desktop Circuit Board Prototyping

Desktop milling machines for prototyping circuit boards have long been particularly helpful to microwave engineering development teams. Often a circuit or a critical part (filter, amplifier, coupler, etc.) needs to be designed quickly to keep the entire project on schedule. In many cases the desktop milling system can create...
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High Density RF Interconnect

With system space ever at a premium and operating frequencies constantly on the rise today’s RF/microwave interconnection cables must follow suit and be smaller and higher performance. One of the limiting factors to this progression has always been the cable connector. Its pin/socket-type male and female interconnect system adds...
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An Improved Thermal Design for
III-N HEMTs on Silicon Substrates

Thermal design is a primary concern for enabling electronic devices to reach their potential to operate at high power densities. Heat must be removed efficiently in order to keep the channel temperature below a desired limit. Elevated operating tempera...
The power density of large periphery III-N HEMTs can be as high as 5 W/mm, 1–3 much greater than GaAs (1 W/mm) and Si LDMOS (0.8 W/mm). These devices can generate more power per unit area of chip, or equivalent power in a much smaller package. All power that...
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Improvements in Band Rejection Characteristics
of a Wideband Antenna Using Resonant Slots

This article presents a method to improve and control the band rejection characteristics of wideband bow-tie patch antennas by using two notch slots. The two-pole band rejection characteristics were obtained by adjusting the mutual coupling values, as ...
In recent applications of telecommunications and remote sensing at microwave frequencies, the exploitation of UWB antennas is steadily growing. 1 UWB radio can use the frequency band from 3.1 to 10.6 GHz. UWB systems also need to be compatible with other already existing standards. 2 To allow such a...
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A Sub-harmonic Quadrature Mixer
Using APDPs for UWB Systems

This article presents an ultra-wideband (UWB) sub-harmonic mixer comprising anti-parallel diode pairs (APDP), a miniaturized bandpass filter (BPF) and a wideband 45° Wilkinson power divider. The proposed UWB mixer operates over the 3.1 to 4.8 GHz band ...
A great deal of attention has recently been paid to ultra-wideband (UWB) technologies for short-range and high data-rate wireless personal area networks (WPAN). By supporting data rates up to several hundred megabits per second (Mbps), these technologies are expected to be used in multimedia consumer electronic products in the...
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Applications and Antenna Selection in the 4.9 GHz Band

This article will begin with a review of various applications and uses for the 4.9 GHz band (4.40 to 4.99 GHz) and then focus on applications and antenna selection for the “new” 4.940 to 4.990 GHz public safety band allocated by the Federal Communicati...
A variety of commercial, governmental and military applications utilize the 4.40 to 4.99 GHz band. In the US and NATO countries, the 4.4 to 4.5 GHz band is designated for military fixed and mobile communications such as point-to-point microwave links and telemetry applications such as unmanned aerial vehicles (UAV),...
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A Highly Efficient 7 to 14 GHz Monolithic
Class-E Power Amplifier

This article describes the design and fabrication of a highly efficient broadband monolithic class-E power amplifier utilizing a new distributed class-E load topology. The amplifier maintains a simultaneous high power-added efficiency (PAE) and output ...
Highly efficient monolithic power amplifiers, such as those operating under switching-mode conditions, that is class-E, -F, are suitable for the realization of large-scale phased-array radar systems. 1 In these systems, the number of radiators can easily reach 100,000 or more. Such large-scale arrays are ideal for applications in space...
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