Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications
This paper presents a design methodology of three-dimensional (3-D) passive metallic waveguide-array lens antenna (MWALA) by implementing the Rotman lens concept (RLC) for collinear multi-beam radiations on the same angular plane. The RLC methodology extends the original concept of two-dimensional (...
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| Format: | Article |
| Language: | English |
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IEEE
2019-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/8854795/ |
| _version_ | 1818603159895932928 |
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| author | Hsi-Tseng Chou Zong-Chen Tsai Siddhartha Panigrahi |
| author_facet | Hsi-Tseng Chou Zong-Chen Tsai Siddhartha Panigrahi |
| author_sort | Hsi-Tseng Chou |
| collection | DOAJ |
| description | This paper presents a design methodology of three-dimensional (3-D) passive metallic waveguide-array lens antenna (MWALA) by implementing the Rotman lens concept (RLC) for collinear multi-beam radiations on the same angular plane. The RLC methodology extends the original concept of two-dimensional (2-D) tri-focal Rotman lens into a 3-D one in free space. Thus, the MWALA has a planar aperture facing to the radiation boresight to resemble a planar phased array of waveguide antennas and also has a curved focal surface profile (CFSP) on the opposite side to receive the illumination by the radiations of feed antennas. The three co-planar focal points are specified to define a circular focal arc (CFA) for multiple feed placement to radiate multi-beams through this MWALA. The boundary formed by the CFSP and CFA resembles the shape of Rotman lens equivalently realized in free space. In addition, the shortage of freedoms in conventional MWALA design limited to dual-focus configurations and resulting in narrow scan angles, is relaxed by adopting the phase velocities inside the waveguides as an additional freedom to realize a tri-focal configuration and broaden the scan angles of multi-beam radiation. Theoretical foundation and design guidelines are summarized with numerical and experimental examples presented to validate the feasibility. |
| first_indexed | 2024-12-16T13:18:45Z |
| format | Article |
| id | doaj.art-a5a1fa1f084e4cf38ae29a46f0609f24 |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-16T13:18:45Z |
| publishDate | 2019-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-a5a1fa1f084e4cf38ae29a46f0609f242022-12-21T22:30:25ZengIEEEIEEE Access2169-35362019-01-01714452414453510.1109/ACCESS.2019.29450478854795Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam ApplicationsHsi-Tseng Chou0https://orcid.org/0000-0002-1883-9782Zong-Chen Tsai1Siddhartha Panigrahi2Graduate Institute of Communications Engineering, National Taiwan University, Taipei, TaiwanGraduate Institute of Communications Engineering, National Taiwan University, Taipei, TaiwanGraduate Institute of Communications Engineering, National Taiwan University, Taipei, TaiwanThis paper presents a design methodology of three-dimensional (3-D) passive metallic waveguide-array lens antenna (MWALA) by implementing the Rotman lens concept (RLC) for collinear multi-beam radiations on the same angular plane. The RLC methodology extends the original concept of two-dimensional (2-D) tri-focal Rotman lens into a 3-D one in free space. Thus, the MWALA has a planar aperture facing to the radiation boresight to resemble a planar phased array of waveguide antennas and also has a curved focal surface profile (CFSP) on the opposite side to receive the illumination by the radiations of feed antennas. The three co-planar focal points are specified to define a circular focal arc (CFA) for multiple feed placement to radiate multi-beams through this MWALA. The boundary formed by the CFSP and CFA resembles the shape of Rotman lens equivalently realized in free space. In addition, the shortage of freedoms in conventional MWALA design limited to dual-focus configurations and resulting in narrow scan angles, is relaxed by adopting the phase velocities inside the waveguides as an additional freedom to realize a tri-focal configuration and broaden the scan angles of multi-beam radiation. Theoretical foundation and design guidelines are summarized with numerical and experimental examples presented to validate the feasibility.https://ieeexplore.ieee.org/document/8854795/Antenna radiationmulti-beam radiationRotman lenswaveguide array lens antenna |
| spellingShingle | Hsi-Tseng Chou Zong-Chen Tsai Siddhartha Panigrahi Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications IEEE Access Antenna radiation multi-beam radiation Rotman lens waveguide array lens antenna |
| title | Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications |
| title_full | Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications |
| title_fullStr | Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications |
| title_full_unstemmed | Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications |
| title_short | Tri-Focal Configuration of Three-Dimensional Metallic Waveguide-Array Lens Antennas of Rotman Lens Concept for Multi-Beam Applications |
| title_sort | tri focal configuration of three dimensional metallic waveguide array lens antennas of rotman lens concept for multi beam applications |
| topic | Antenna radiation multi-beam radiation Rotman lens waveguide array lens antenna |
| url | https://ieeexplore.ieee.org/document/8854795/ |
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