Near Field Models of Spatially-Fed Planar Arrays and Their Application to Multi-Frequency Direct Layout Optimization for mm-Wave 5G New Radio Indoor Network Coverage
Abstract
:1. Introduction
2. Statement of the Problem
3. Near Field Models of Reflectarray and Transmitarray Antennas
3.1. Field at the Aperture
3.2. Near Field from the Radiation Equations
3.3. Near Field as Superposition of Far Field Contributions
3.4. Change of Coordinates
3.5. Comparison of the Near Field Models
4. Wideband near Field Shaping with Application to Indoor Femtocell Coverage
4.1. Scenario Definition and Antenna Specifications
4.2. Unit Cell Characterization
4.3. Phase-Only Synthesis at 28 GHz
4.4. Multi-Frequency Optimization of the Near Field
4.5. Discussion
5. Conclusions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Abbreviations
5G NR | Fifth generation new radio |
ACS | Array coordinate system |
DLO | Direct layout optimization |
DoF | Degrees of freedom |
FF | Far field |
FFT | Fast Fourier transform |
FR | Frequency Range |
GIA | Generalized intersection approach |
MoM-LP | Method of moments based on local periodicity |
NF | Near field |
NFCS | Near field coordinate system |
POS | Phase-only synthesis |
Appendix A
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FF contributions | 2.22% | 2.21% | 3.20% | 0.22% | 0.22% | 0.32% |
NF () | 0.09% | 0.33% | 3.10% | 0.06% | 0.14% | 0.15% |
NF () | 0.01% | 0.02% | 0.18% | 0.00% | 0.01% | 0.01% |
Model | Time (s) |
---|---|
FF contributions | 1.40 |
NF () | 24.65 |
NF () | 168.45 |
NF () | 455.89 |
Frequency (GHz) | Polarization X | Polarization Y | ||||||
---|---|---|---|---|---|---|---|---|
Ripple (dB) | 1 dB (%) | 2 dB (%) | 3 dB (%) | Ripple (dB) | 1 dB (%) | 2 dB (%) | 3 dB (%) | |
26.5 | 5.34 | 42.45 | 63.35 | 82.03 | 5.92 | 30.40 | 58.80 | 78.97 |
27.0 | 3.79 | 47.17 | 71.23 | 98.79 | 3.97 | 43.83 | 73.20 | 98.45 |
27.5 | 2.53 | 43.63 | 93.75 | 100 | 2.53 | 48.57 | 89.96 | 100 |
28.0 | 2.66 | 51.28 | 96.44 | 100 | 2.48 | 45.14 | 99.10 | 100 |
28.5 | 3.74 | 58.82 | 86.04 | 96.40 | 3.58 | 52.70 | 90.61 | 98.49 |
29.0 | 6.39 | 33.76 | 54.02 | 81.71 | 5.03 | 54.69 | 81.71 | 89.96 |
29.5 | 9.19 | 26.42 | 44.32 | 57.55 | 7.37 | 37.15 | 63.18 | 77.81 |
Frequency (GHz) | Polarization X | Polarization Y | ||||||
---|---|---|---|---|---|---|---|---|
Ripple (dB) | 1 dB (%) | 2 dB (%) | 3 dB (%) | Ripple (dB) | 1 dB (%) | 2 dB (%) | 3 dB (%) | |
26.5 | 1.30 | 80.89 | 100 | 100 | 0.82 | 100 | 100 | 100 |
27.0 | 1.03 | 99.63 | 100 | 100 | 0.84 | 100 | 100 | 100 |
27.5 | 1.08 | 95.63 | 100 | 100 | 0.96 | 100 | 100 | 100 |
28.0 | 1.23 | 84.90 | 100 | 100 | 0.96 | 100 | 100 | 100 |
28.5 | 1.26 | 76.73 | 100 | 100 | 1.02 | 99.07 | 100 | 100 |
29.0 | 1.25 | 96.72 | 100 | 100 | 1.16 | 93.67 | 100 | 100 |
29.5 | 1.50 | 89.05 | 100 | 100 | 1.49 | 90.52 | 100 | 100 |
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Prado, D.R. Near Field Models of Spatially-Fed Planar Arrays and Their Application to Multi-Frequency Direct Layout Optimization for mm-Wave 5G New Radio Indoor Network Coverage. Sensors 2022, 22, 8925. https://doi.org/10.3390/s22228925
Prado DR. Near Field Models of Spatially-Fed Planar Arrays and Their Application to Multi-Frequency Direct Layout Optimization for mm-Wave 5G New Radio Indoor Network Coverage. Sensors. 2022; 22(22):8925. https://doi.org/10.3390/s22228925
Chicago/Turabian StylePrado, Daniel R. 2022. "Near Field Models of Spatially-Fed Planar Arrays and Their Application to Multi-Frequency Direct Layout Optimization for mm-Wave 5G New Radio Indoor Network Coverage" Sensors 22, no. 22: 8925. https://doi.org/10.3390/s22228925