CST – Computer Simulation Technology

Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates

Title:
Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates
Author(s):
Per-Simon Kildal, Fellow, E. Alfonso, A. Valero-Nogueira, Eva Rajo-Iglesias
Source:
IEEE Antennas and Wireless Propagation Letters
Vol./Issue/Date:
Volume: 8, 2009
Year:
2009
Page(s):
84-87
Keywords:
Gap waveguides, metamaterials, millimeter waves, submillimeter waves, waveguides
Abstract:
This letter presents a new metamaterial-based waveguide technology referred to as ridge gap waveguides. The main advantages of the ridge gap waveguides compared to hollowwaveguides are that they are planar and much cheaper to manufacture, in particular at high frequencies such as for millimeter and submillimeter waves. The latter is due to the fact that there are no mechanical joints across which electric currents must float. The gap waveguides have lower losses than microstrip lines, and they are completely shielded by metal so no additional packaging is needed, in contrast to the severe packaging problems associated with microstrip circuits. The gap waveguides are realized in a narrow gap between two parallel metal plates by using a texture or multilayer structure on one of the surfaces. The waves follow metal ridges in the textured surface. All wave propagation in other directions is prohibited (in cutoff) by realizing a high surface impedance (ideally a perfect magnetic conductor) in the textured surface at both sides of all ridges. Thereby, cavity resonances do not appear either within the band of operation. The present letter introduces the gap waveguide and presents some initial simulated results.
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