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July 2006 [Commercial] Stripline Crossover Board Facilitates Planar High-Frequency Microwave Subassemblies One of the challenges in the layout of multifunction microwave assemblies is the crossing of microwave transmission lines while maintaining isolation requirements. In designs of limited complexity, this crossing-over has been done using a vertical transition. The transition comprises RF feedthroughs that are used to route signals to the backside of the housing and back up again in order to maintain the high isolation between signal paths. Although this design ... — Raymond Kaarsberg , et al. July 2006 [Commercial] Advanced Oscillator Technology Conquers Reference Degradation Due To Dynamic Environments The Problem: The sophisticated military electronic systems aboard helicopters, missiles, and unmanned aerial vehicles (UAVs) must provide superior performance while being subjected to severe environmental conditions. The greatest impact on high performance comes from dynamic environments—those that induce degradations while the military platform is in motion accomplishing its intended mission. Of these mobile disturbances, vibration, acceleration, and shock have ... — Olie Mancini July 2006 [Commercial] Microwave Synthesizers Aid Aircraft Tracking Significant advances have been made in Laser Detection and Ranging (LADAR) systems, which also are known as Light Detection and Ranging (LIDAR). These advances provide for a broad range of target imaging and tracking applications. LADAR provides significant advantages over conventional RF RADAR in image resolution, as much shorter wavelengths of the electromagnetic spectrum are used (typically in the ultraviolet, visible, or near infrared). Because image resolution... — Ken Positeri July 2006 [Commercial] SMD Port Discontinuities Are Conquered It was a pesky problem: the highaccuracy EM analysis of circuits with ports placed internal to the circuit (instead of on the edge). These internal ports would be used to connect surface-mount devices (SMDs) or include transistors inside an RF IC. Much of the time, uncalibrated internal port results are "good enough." When measured and calculated, they line up reasonably close. But there was that pesky little bit of difference that occasionally became large and design-disabling. ... — James B. Rautio July 2006 [Commercial] Quick ACPR Analysis Performs Necessary PA Simulations Traditionally, power amplifiers for communication systems have been designed to meet specifications like 1-dB gain-compression output power or third-order intercept point. Such tests can be made with one or two sinusoidal input tones. In reality, however, these power amplifiers are usually required to meet a certain adjacent-channel-power-ratio (ACPR) specification or satisfy a spectral mask at a particular output power. These results may not be obtained by using... — Andy Howard July 2006 [Commercial] Connectors Raise Density And Reduce Footprint A major defense contractor wanted to eliminate the use of cable assemblies for its in-the-box applications. The contractor gave W.L. Gore & Associates the challenge of developing low-profile boardto-board interconnects for its Common Radar Module (CRM) architecture. The requirements for a super-density, push-on interconnect series included the following: center-to-center spacing of 0.085 in. maximum, printed-circuit-board (PCB) -to-PCB stack height of 0.110 in. maximum, lowest possible... — Paul A. Czikora July 2006 [Commercial] Making The Case For Well-Rounded Devices In today's competitive wireless market, success is measured by providing solutions for customers rather than simply delivering " unprecedented performance" in a single area. For example, a new performance benchmark set by an RF power transistor will make great headlines. But it will accomplish little else if it isn't accompanied by attributes that let customers put that performance to work. To be truly useful in a particular system, it must offer more than impressive P1dB or Psat "numbers."... — John McCaffrey |
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