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6.EM-Tline-Antenna

6.EM-Tline-Antenna - E lect r omagnet ic Wave Waveguide T r...

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Electromagnetic Wave, Waveguide, Transmission Line, and Antenna
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Propagation Reflection and Scattering Refraction Interference 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 =
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Propagation in Air Ionosphere Ionized particles 80-300 km Ground Plane Modes Direct line of sight Earth curvature Ground wave Sky wave Space wave
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Sky Waves Long Wavelength Ground and ionosphere http://www.vlf.it/thierry/waveguide_propagation.html Short Wavelength
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Waveguide Metallic Waveguide Dielectric Waveguide Dielectric Media Cable Polyethylene Teflon PCB Rigid: Alumina, PTFE Flexible: Polyimide Dielectric constant Loss tangent εϖ σ δ - = tan
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Applications of Waveguides Long Haul Performance Loss, dispersion Networking Quick connect Termination Printed Circuit Board RF and microwave packaging
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Waveguide Analysis Wave Equation Periodic in time Helmholtz Equation Periodic in z Transverse Modal Equation Boundary Conditions Waveguide Theory http://www.fnrf.science.cm 0 2 2 = - E E γ 0 2 2 2 = - t E E με
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Modes Guided Modes Discrete; possibly multiple Radiation Modes Continuous Evanescent Field Exponentially decaying
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Waveguide Properties Polarization TEM TE, TM Hybrid modes Propagation Constant Loss Dispersion
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Dispersion Frequency Dependent Refractive Index Material dispersion Waveguide modal dispersion (single mode) Inter-modal dispersion (multimode) Pulse broadening www.lunatechnologies.com/files/24introchromatic dispersionweb.pdf
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Waveguide Devices Directional Coupler Multi hole Lumped element, stripline Frequency dependent Mini Circuits www. minicircuits.com/pages/appnote/do-it-yourself couplers.pdf
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New Developments Negative Index Materials http://www.ee.duke.edu/~drsmith/neg_ref_home.htm Photonic Bandgap Materials http://www.pbglink.com/
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Transmission Line Analysis Wavelength Versus Distance
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