Affordable Thin Lens Using Single Polarized Disparate Filter Arrays for Beyond 5G toward 6G
2. Design of Single Polarized Thin Lens
2.1. Comparison of In-Plane Reactiance for Single/Dual Polarization
2.2. Single-Polarized Low-Pass and Band-pass Unit Cells
2.3. Feeder Design: 4 × 4 Patch Antenna Array
2.4. Lens Implementation Usnig Macro Design
- Step 1:
- The proposed lens is chosen to be located at a distance of 150 mm away from the 4 × 4 patch antenna array. The diameter of the selected aperture for the lens is chosen to be 150 mm. The value of f/D was chosen to be 1.0, where f is the distance between the feed antenna and the lens, and D is the diameter of the lens, to implement a compact and focused design. It should be noted that the target distance also determines the adjustable range of the phase shift.
- Step 2:
- The phase profile of the waves emitted from the 4 × 4 patch antenna array source is captured on the selected aperture at the distance of 150 mm. In this case, the phase profile is captured every 1.5 mm from the center of the lens considering the size of the unit cell, which is 1.5 mm.
- Step 3:
- The phase values needed for collimating radiated rays at all captured points are calculated and matched to the selected unit cells in Table 1. For the interval outside the range of tunable range from −280 to 0°, LP1 and BP5 are used as alternatives.
- Step 4:
- If the type of the unit cell at each point is the same as that at the next point, the area formed by these two points is grouped and classified as a zone.
- Step 5:
- It should be noted that variations in the ILs over the lens aperture might have the same effect as that of the non-uniform magnitude of feeds in a phased antenna array, leading to beam deformation related to beam width, side lobes, and so on [22,23]. Table 2 lists the numbered zones, the number of selected unit cells in each zone, the required phase shift at the center of each zone, and the selected unit cells in each zone. In Table 2, it is assumed that the change in the phase shift due to the different incident angles of the unit cells constituting the proposed lens is not significant.
- Step 6:
- Finally, a macro design of the proposed lens is completed, as shown in Figure 11 through the aforementioned steps. The first and third layers consist only of the capacitive strip unit cells proposed in Section 2.2. In the second layer, both of the capacitive and inductive strip unit elements are repeatedly arranged according to the zone classified in step 5.
3. Fabrication and Measurement
Conflicts of Interest
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|UC#||Filter Type||g1 (mm)||g2 (mm)||g3 (mm)||w (mm)||Insertion Loss (dB)||Phase Shift (°)|
|Zone #||Number of Cascaded Unit Cells||Required Phase Shift in the Middle of Each Zone (deg.)||Selected UC #||Zone #||Number of Cascaded Unit Cells||Required Phase Shift in the Middle of Each Zone (deg.)||Selected UC #|
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Yoon, I.; Oh, S.; Oh, J. Affordable Thin Lens Using Single Polarized Disparate Filter Arrays for Beyond 5G toward 6G. Sensors 2019, 19, 3982. https://doi.org/10.3390/s19183982
Yoon I, Oh S, Oh J. Affordable Thin Lens Using Single Polarized Disparate Filter Arrays for Beyond 5G toward 6G. Sensors. 2019; 19(18):3982. https://doi.org/10.3390/s19183982Chicago/Turabian Style
Yoon, Inseop, Seongwoog Oh, and Jungsuek Oh. 2019. "Affordable Thin Lens Using Single Polarized Disparate Filter Arrays for Beyond 5G toward 6G" Sensors 19, no. 18: 3982. https://doi.org/10.3390/s19183982