6.EM-Tline-Antenna

6.EM-Tline-Antenna - Electromagnetic Wave Waveguide Transmission Line and Antenna Propagation • Ref lection and Scatt er ing • Refraction • I

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Unformatted text preview: Electromagnetic Wave, Waveguide, Transmission Line, and Antenna Propagation • Ref lection and Scatt er ing • Refraction • I nt er ference – Multipath • Path loss • http://www.cisco.com/univercd/cc/td/doc/product/wireless/bbfw/ptop/p2 pspg02/spg02ch2.htm 2 ) 4 ( λ π D L p = Propagation in Air • I onosphere – I onized particles 80-300 km • Ground Plane • Modes – Direct line of sight • Earth curvature – Ground wave – Sky wave – Space wave Sky Waves • Long Wavelength – Ground and ionosphere • http://www.vlf.it/thierry/waveguide_propagation.html • Short Wavelength Waveguide • Metallic Waveguide • Dielectr ic Waveguide • Dielectr ic Media – Cable • Polyethylene • Tef lon – PCB • Rigid: Alumina, PTFE • Flexible: Polyimide – Dielectr ic constant – Loss tangent εϖ σ δ- = tan Applications of Waveguides • Long Haul – Per for mance • Loss, dispersion • Networking – Quick connect – Ter mination • Pr int ed Circuit Board – RF and microwave packaging Waveguide Analysis • Wave Equation – Per iodic in time • Helmholtz Equation – Per iodic in z • Transverse Modal Equation • Boundar y Conditions • Waveguide Theor y – http://www.fnr f.science.cm 2 2 =- ∇ E E γ 2 2 2 = ∂ ∂- ∇ t E E με Modes • Guided Modes – Discrete; possibly multiple • Radiation Modes – Continuous • Evanescent Field – Exponentially decaying Waveguide Properties • Polarization – TEM – TE, TM – Hybrid modes • Propagation Constant • Loss • Dispersion Dispersion • Frequency Dependent Refractive I ndex – Material dispersion – Waveguide modal dispersion (single mode) – I nter-modal dispersion (multimode) • Pulse broadening – www.lunatechnologies.com/files/24introchromatic disper sionweb.pdf Waveguide Devices • Directional Coupler – Multi hole – Lumped element, stripline – Frequency dependent – Mini Circuits • www. minicir cuits.com/pages/appnote/do-it-your self coupler s.pdf New Developments • Negative I ndex Materials – http://www.ee.duke.edu/~drsmith/neg_ref_home.htm • Photonic Bandgap Materials – http://www.pbglink.com/ Transmission Line Analysis...
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This note was uploaded on 02/24/2011 for the course EE 513 taught by Professor Dr.paololiu during the Spring '11 term at SUNY Buffalo.

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6.EM-Tline-Antenna - Electromagnetic Wave Waveguide Transmission Line and Antenna Propagation • Ref lection and Scatt er ing • Refraction • I

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