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December 2007 [Components] Estimate Microstrip Substrate Relative Dielectric Constant Firas Mohammed Ali Al-Raie Department Head The Polytechnic Higher Institute of Yefren, Libya, Department of Electronic Engineering, e-mail: firas@ieee.org Microstrip lines are commonly used in microwave circuits, although their performance is subject to the type of substrate material selected for a printed-circuit board (PCB). One of the more important material parameters for the substrate is the... October 2006 [Components] Practical Approach Yields Class C PA Broadband Class C power amplifiers (PAs) are useful in certain communications bands. Although now integrated into the Advanced Design System (ADS) simulation software from Agilent-EEsof (www.agilent.com), the Touchstone simulation software at one time was a powerful tool for developing and optimizing impedance matching networks for such amplifiers. What follows is a design approach to show how to extract the optimum... |
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