tailieunhanh - Microstrip bộ lọc cho các ứng dụng lò vi sóng RF (P4)

Transmission Lines and Components In this chapter, basic concepts and design equations for microstrip lines, coupled microstrip lines, discontinuities, and components useful for design of filters are briefly described. Though comprehensive treatments of these topics can be found in the open literature, they are summarized here for easy reference. | Microstrip Filters for RF Microwave Applications. Jia-Sheng Hong M. J. Lancaster Copyright 2001 John Wiley Sons Inc. ISBNs 0-471-38877-7 Hardback 0-471-22161-9 Electronic CHAPTER 4 Transmission Lines and Components In this chapter basic concepts and design equations for microstrip lines coupled microstrip lines discontinuities and components useful for design of filters are briefly described. Though comprehensive treatments of these topics can be found in the open literature they are summarized here for easy reference. MICROSTRIP LINES Microstrip Structure The general structure of a microstrip is illustrated in Figure . A conducting strip microstrip line with a width W and a thickness t is on the top of a dielectric substrate that has a relative dielectric constant sr and a thickness h and the bottom of the substrate is a ground conducting plane. Waves in Microstrips The fields in the microstrip extend within two media air above and dielectric below so that the structure is inhomogeneous. Due to this inhomogeneous nature the microstrip does not support a pure TEM wave. This is because that a pure TEM wave has only transverse components and its propagation velocity depends only on the material properties namely the permittivity i and the permeability fi. However with the presence of the two guided-wave media the dielectric substrate and the air the waves in a microstrip line will have no vanished longitudinal components of electric and magnetic fields and their propagation velocities will depend not only on the material properties but also on the physical dimensions of the microstrip. 77 78 TRANSMISSION LINES AND COMPONENTS Quasi-TEM Approximation When the longitudinal components of the fields for the dominant mode of a microstrip line remain very much smaller than the transverse components they may be neglected. In this case the dominant mode then behaves like a TEM mode and the TEM transmission line theory is applicable for the microstrip

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• Bộ lọc Microstrip
• ứng dụng lò vi sóng
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