Laser Texas AampM University, College Station, TX激光德克萨斯amp；M大学，学院站，德克萨斯州.pptVIP

Thank You * * * * * * * * * * * The Fundamental Physics of Directive Beaming at Microwave and Optical Frequencies in Terms of Leaky Waves Saman Kabiri, Master’s Student Dept. of Electrical and Computer Engineering Texas AM University Course: Laser Spectroscopy Instructor: Dr. Hans Schuessler Monday, November 26th, 2012 Outline - Introduction and Motivation - Definition of Antenna’s Parameters - Antennas Based on a PRS - Directive Beaming at Optical Frequencies * Outline - Introduction and Motivation - Definition of Antenna’s Parameters - Antennas Based on a PRS - Directive Beaming at Optical Frequencies * Introduction Directive beaming occurs in antenna design where a narrow beam is desirable by using fairly simple planar structure excited by a single source. This topic is fairly rich, and extending from the 1950s until the present time. Several applications: 1- Construction of novel highly directive antenna 2- Optical effect such as narrow beaming of light from a subwavelength aperture 3- Enhanced transmission of light from a subwavelength aperture The purpose of this talk is to give a common explanation of the directive-beaming phenomenon in terms of leaky wave. Leaky-wave theory is used to present simple design formulas. * Introduction Three main structures are used as highly directive antenna. * Three main structures Fabry-Perot cavity Metamaterial structures Directive beaming at optical frequencies Introduction Three main structures are used as highly directive antenna. * Three main structures Fabry-Perot cavity Metamaterial structures Directive beaming at optical frequencies Outline - Introduction and Motivation - Definition of Antenna’s Parameters - Antennas Based on a PRS - Directive Beaming at Optical Frequenci