Confocal Ellipsoidal Reflectors with Phased Array Vivaldi Antenna Source for Imaging Systems
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911037709615104 |
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| author | Ghamsari, Mohammad Hossein Koohi Pashaki, Mahyar Mehri Ahmadi-Boroujeni, Mehdi |
| author_facet | Ghamsari, Mohammad Hossein Koohi Pashaki, Mahyar Mehri Ahmadi-Boroujeni, Mehdi |
| contents | In this paper, an on-axis dual-reflector confocal ellipsoidal structure is presented for near-field imaging systems. In the proposed structure, the backscattered electromagnetic wave problem, known as the blockage effect, is reduced considerably using an elaborate design of the sub-reflector and precise alignment of the reflectors. The proposed geometry is analyzed, followed by a design example for the stand-off distance of 2 m. The blockage reduction characteristic is verified using ray-tracing simulation. Next, the scanning performance of the structure is investigated utilizing a Vivaldi phased array antenna as the source designed at the central frequency of 28 GHz. The full-wave simulations proved a field-of-view (FoV) of approximately 40 cm. Furthermore, tuning the proposed reflectors configuration standoff distance is examined with a point source. The ray-tracing simulations showed that stand-off distance can be easily changed up to tens of centimeters with just a few centimeters of source point lateral displacement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_15997 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Confocal Ellipsoidal Reflectors with Phased Array Vivaldi Antenna Source for Imaging Systems Ghamsari, Mohammad Hossein Koohi Pashaki, Mahyar Mehri Ahmadi-Boroujeni, Mehdi Optics In this paper, an on-axis dual-reflector confocal ellipsoidal structure is presented for near-field imaging systems. In the proposed structure, the backscattered electromagnetic wave problem, known as the blockage effect, is reduced considerably using an elaborate design of the sub-reflector and precise alignment of the reflectors. The proposed geometry is analyzed, followed by a design example for the stand-off distance of 2 m. The blockage reduction characteristic is verified using ray-tracing simulation. Next, the scanning performance of the structure is investigated utilizing a Vivaldi phased array antenna as the source designed at the central frequency of 28 GHz. The full-wave simulations proved a field-of-view (FoV) of approximately 40 cm. Furthermore, tuning the proposed reflectors configuration standoff distance is examined with a point source. The ray-tracing simulations showed that stand-off distance can be easily changed up to tens of centimeters with just a few centimeters of source point lateral displacement. |
| title | Confocal Ellipsoidal Reflectors with Phased Array Vivaldi Antenna Source for Imaging Systems |
| topic | Optics |
| url | https://arxiv.org/abs/2501.15997 |