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Crossing the bridge – Ponte 25 de Abril

This is from my recent trip to Lisbon, Portugal. I was able to catch the evening commuter train to the other side of the Targus River. A beautiful city that deserves more time to spend. var _gaq = _gaq || []; _gaq.push([‘_setAccount’, ‘UA-24872537-1’]); _gaq.push([‘_trackPageview’]); (function() { var ga = document.createElement(‘script’); ga.type = ‘text/javascript’; ga.async =… Continue reading Crossing the bridge – Ponte 25 de Abril

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Periodic Band Gap (PGB) Waveguide and Propagation – FDTD Simulation

Inspired by the following video:http://www.youtube.com/watch?v=O-6l0bvAda0 Guiding EM waves via periodic structure. The frequency of operation is 11.085 GHz. The relative dielectric permittivity of the square blocks are 11.56 and the ambient medium is air. Each block is 3.5 mm x 3.5 mm. The main reference is the below dissertation:Marcelo Bruno Dias, “Estudo da Propagação de… Continue reading Periodic Band Gap (PGB) Waveguide and Propagation – FDTD Simulation

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Linear, Circular and Elliptical Polarization Animation in a Single Shot

The total electric field components of plane waves with various polarizations traveling in the +z direction. Specifically, linear, right hand circular and elliptical polarizations are shown. Also see below:Oblique Plane Wave Reflection From Half SpaceRadiation from a Circularly Tapered Dielectric WaveguideRight Hand Circular Polarization (RHCP) AnimationLinear Polarization AnimationLeft Hand Elliptical Polarization (LHEP) AnimationStanding Wave Pattern… Continue reading Linear, Circular and Elliptical Polarization Animation in a Single Shot

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Linear Polarization Animation

Uniform plane wave traveling in the +z direction. The x and y component of the electric fields are in phase thus the polarization of the electric field is constant over all space (linearly polarized). Also see below:Oblique Plane Wave Reflection From Half SpaceRadiation from a Circularly Tapered Dielectric WaveguideRight Hand Circular Polarization (RHCP) AnimationLinear Polarization… Continue reading Linear Polarization Animation

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Left Hand Elliptical Polarization (LHEP) Animation

Uniform plane wave traveling in the +z direction. The x and y component of the electric fields have a phase shift with results in a elliptically rotating polarization in the left hand direction. Also see below:Oblique Plane Wave Reflection From Half SpaceRadiation from a Circularly Tapered Dielectric WaveguideRight Hand Circular Polarization (RHCP) AnimationLinear Polarization AnimationLeft… Continue reading Left Hand Elliptical Polarization (LHEP) Animation