Title :
Periodic Materials and Printed Structures for Miniature Antennas
Author :
Volakis, John L. ; Sertel, Kubilay ; Verweij, Henk
Author_Institution :
Dept. of Electr. & Comp. Eng., Ohio State Univ., Columbus, OH
Abstract :
Engineered materials, such as new composites, electromagnetic bandgap, and periodic structures have attracted considerable interest in recent years due to their remarkable and unique electromagnetic properties. Among this class of media are the magnetic photonic and degenerate bandgap crystals. These periodic media have the concurrent characteristics of wave slow-down and impedance matching at their dielectric interface. The first allows for miniaturization, and the latter is equivalent to radiation efficiency. Overall these properties are a consequence of the anisotropic nature of the periodic media, allowing for internal phase shifting that leads to ray collimation for best aperture utilization. To a degree, they emulate zero index materials, and thus (planar) layers of the material serve the same purpose as a reflector dish. This important property of the MPA and DBE structures are discussed at the meeting. The main focus of this work is two-fold: 1. The realization (in terms of material availability and fabrication) of the proposed periodic media, and their theoretical and measured performance for antenna applications. Specifically, we will pursue feed arrangements, impedance matching and metallizations/printings for maximum aperture efficiency. 2. Introduction of a concept that allows for emulation of the anisotropic properties of MPA/DBE media using a novel coupled line printed approach. This concept allows for the realization of the wave slow-down and impedance matching within a printed microwave structure, leading to new design methodologies for microwave components, including couplers, filters and printed antenna devices.
Keywords :
impedance matching; microstrip antennas; photonic band gap; photonic crystals; DBE; MPA; coupled line printed approach; degenerate bandgap crystals; dielectric interface; electromagnetic bandgap; electromagnetic properties; engineered materials; feed arrangements; impedance matching; internal phase shifting; magnetic photonic crystals; maximum aperture efficiency; miniature antennas; periodic materials; printed microwave structure; printed structures; radiation efficiency; ray collimation; wave slow-down; zero index materials; Anisotropic magnetoresistance; Apertures; Crystalline materials; Impedance matching; Magnetic materials; Microwave devices; Nonhomogeneous media; Periodic structures; Photonic band gap; Photonic crystals;
Conference_Titel :
Antenna Technology: Small and Smart Antennas Metamaterials and Applications, 2007. IWAT '07. International Workshop on
Conference_Location :
Cambridge
Print_ISBN :
1-4244-1088-6
Electronic_ISBN :
1-4244-1088-6
DOI :
10.1109/IWAT.2007.370073