CPW Design Fundamentals
| Autor: | Terry C. Edwards, Michael B. Steer |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Foundations for Microstrip Circuit Design ISBN: 9781118936160 Foundations of Interconnect and Microstrip Design, Third Edition |
| DOI: | 10.1002/9781118936160.ch14 |
| Popis: | Quite unlike a microstrip, a coplanar waveguide (CPW) has its principal grounding in the form of wide strips adjacent to the active conductor. Thus, the signal characteristics are almost entirely governed by laterally defined dimensions. The chapter shows how various like quantities effective permittivity, propagation constant, and phase velocity can be defined for basic CPW. CPW exhibits two distinct transmission loss mechanisms: dielectric losses and also ohmic or conductor losses. Radiation losses can also become noticeable with CPW, but this is much lower than with microstrip. CPW is also to some extent dispersive, that is, the transmission phase constant varies non‐linearly with frequency. The chapter also describes some passive circuit elements that can be formed using the CPW medium. Air bridges are traditionally necessary in order to maintain the dominant mode in CPW. Significant alternatives to the air bridges are the top and bottom metal shields. |
| Databáze: | OpenAIRE |
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