Publication details
Wide-Angle Ceramic Retroreflective Luneburg Lens Based on quasi-Conformal Transformation Optics for Mm-Wave Indoor Localization
| Authors | |
|---|---|
| Year of publication | 2022 |
| Type | Article in Periodical |
| Magazine / Source | IEEE Access |
| MU Faculty or unit | |
| Citation | |
| Web | https://doi.org/10.1109/ACCESS.2022.3166509 |
| Doi | http://dx.doi.org/10.1109/ACCESS.2022.3166509 |
| Keywords | Transformation optics; Luneburg lens; impedance matching; lens antenna; retroreflector; ceramic 3D printing; indoor localization; mm-wave; artificial dielectrics; chipless RFID |
| Description | This paper presents a quasi-conformal transformation optics (QCTO) based three-dimensional (3D) retroreflective flattened Luneburg lens for wide-angle millimeter-wave radio-frequency indoor localization. The maximum detection angle and radar cross-section (RCS) are investigated, including an impedance matching layer (IML) between the lens antenna and the free-space environment. The 3D QCTO Luneburg lenses are fabricated in alumina by lithography-based ceramic manufacturing, a 3D printing process. The manufactured structures have a diameter of 29.9 mm (4 lambda(0)), showing a maximum realized gain of 16.51 dBi and beam steering angle of +/- 70 degrees at 40 GHz. The proposed QCTO Luneburg lens with a metallic reflective layer achieves a maximum RCS of -20.05 dBsqm at 40 GHz with a wide-angle response over +/- 37 degrees, while the structure with an IML between the lens and air improves these values to a maximum RCS of -15.78 dBsqm and operating angular response between +/- 50 degrees. |