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August 2007 [Materials] Predict Resonances Of Shielded PCBs Shielded enclosures are commonly used as protection for microwave printed-circuit boards (PCBs). While the enclosure can guard a PCB from environmental effects, it can also alter the electrical performance of the circuit. Understanding the effects of the enclosure and how to predict them can improve the accuracy of most modern computeraided-engineering (CAE) simulation tools. As Part 1 of this two-part article series explored last month, the effects of the shielded... July 2007 [Components] Predict Resonances Of Shielded PCBs Microwave circuits are generally enclosed in rectangular shields before integration into a larger system. Unfortunately, when the shield cover goes on, it can cause unexpected results, such as the oscillation of "unconditionally stable" amplifiers, an increase in transmission-line losses, and unwanted coupling. Essentially, the presence of the shielded enclosure can throw off all those advanced computer-aided-engineering (CAE) predictions. And, because it is late in the design... |
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