Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines
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 constant...
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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2011
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| Online Access: | https://hdl.handle.net/10356/43328 |
| _version_ | 1824454574280278016 |
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| author | Amir Khurrum Rashid |
| author2 | Shen Zhongxiang |
| author_facet | Shen Zhongxiang Amir Khurrum Rashid |
| author_sort | Amir Khurrum Rashid |
| collection | NTU |
| description | 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. |
| first_indexed | 2025-02-19T03:24:28Z |
| format | Thesis |
| id | ntu-10356/43328 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:24:28Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/433282023-07-04T17:37:27Z Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines Amir Khurrum Rashid Shen Zhongxiang School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio 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. DOCTOR OF PHILOSOPHY (EEE) 2011-03-09T07:40:20Z 2011-03-09T07:40:20Z 2011 2011 Thesis 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. https://hdl.handle.net/10356/43328 10.32657/10356/43328 en 174 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio Amir Khurrum Rashid Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title | Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title_full | Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title_fullStr | Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title_full_unstemmed | Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title_short | Novel frequency selective structures based on a two-dimensional periodic array of vertical microstrip lines |
| title_sort | novel frequency selective structures based on a two dimensional periodic array of vertical microstrip lines |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Antennas, wave guides, microwaves, radar, radio |
| url | https://hdl.handle.net/10356/43328 |
| work_keys_str_mv | AT amirkhurrumrashid novelfrequencyselectivestructuresbasedonatwodimensionalperiodicarrayofverticalmicrostriplines |