الفهرس 
chapter 1Only 14 pages are availabe for public view
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Abstract
Materials with simultaneously negative permittivity and permeability over a certain frequency band have recently been explored. Such materials are called left-handed metamaterials. Metrunaterial is a modem term used to describe engineered materials composed of electrically small elements. Left-handed metamaterials are usually made by embedding specific inclusions in a specified host medium. If the material is designed correctly then it is possible to produce materials with negative refractive index. A comprehensive review on the properties, design, applications and the state of the lilt of metamaterials is presented. In this thesis a new particle called complementary omega-like structure (COLS) is proposed. As a host medium, a conventional microstrip transmission line is considered. It has been shown that the particles can be successfully excited by the electromagnetic field generated by the microstrip line. Three structures are introduced based on the proposed particle. Simulated frequency dependent forms for the refractive index, permittivity, and permeability have been presented. Achieving negative parameters as well as negative refractive index to our proposed structures are confirmed. The proposed structures are fabricated and tested. The measured results agree well with that obtained by simulation. The effect of the particle dimensions on the negative refractive index band is studied. The effect of the separation distance between two complementary omega-like particles loaded microstrip line on the transmission characteristics is also presented. A super compact microstrip boad stop filter using only one particle has been proposed.