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|Title:||Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines||Authors:||Amir Khurrum Rashid||Keywords:||DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio||Issue Date:||2011||Source:||Amir, K. R. (2011). Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines.Doctoral thesis, Nanyang Technological University, Singapore.||Abstract:||A novel frequency selective structure (FSS) consisting of a two-dimensional (2-D) periodic array of vertical microstrip lines has been proposed. Under plane wave incidence whose polarization is perpendicular to the strips, this array supports two quasi-TEM modes. Controlling the propagation constants and the coupling of these modes with air, it is possible to obtain a quasi-elliptic filtering response. Further, due the existence of quasi-TEM modes, it is easy to use the unit-cells of sub-wavelength size, which leads to stable performance under large variation of the angle of incidence. This FSS has been investigated using an efficient full-wave mode-matching method. The analysis comprises two parts. First, the propagation characteristics of the 2-D array are studied by solving a unit-cell of this structure, which is sandwiched between two periodic boundaries. In the second part, an air-to-array discontinuity is solved using Floquet modes in the air-region. Based on the full-wave analysis, a number of FSSs have been fabricated, which exhibit stable quasi-elliptic filtering response under a large variation of the angle of incidence. Results of the full-wave analysis are in excellent agreement with those obtained from measurements and CST Microwave Studio. Further, a wideband circuit analogue microwave absorber has also been proposed which is based on a similar structure, and exhibits more than 110% bandwidth.||URI:||http://hdl.handle.net/10356/43328||Fulltext Permission:||open||Fulltext Availability:||With Fulltext|
|Appears in Collections:||EEE Theses|
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