摘要(英) |
This thesis proposes a design of broadband dual-polarization patch antenna array for FR1 (Frequency Range 1) frequency band base station equipments, which provide 5G NR (New Radio) n77 to n79 frequency band (3.3 GHz-5.0 GHz) mobile communication applications. The proposed antenna was fed with crossed microstrip lines to obtain dual-polarization characteristics and was made of metal with slots to obtain broadband characteristics. Following the design of the single antenna, a 2 × 2 antenna array was also constructed with array spacing of 0.85 free-space wavelengths (0.85λ0) at the center frequency (4.2 GHz). The single base station antenna and antenna array were placed above a 160 × 276 × 1 mm3 reflector at a distance of 15 mm (0.21λ0) to achieve unidirectional radiation. There were two kinds of substrates used in the thesis: one was a low-cost FR4 substrate, and the other was an NGP-170DR substrate with a low dielectric loss. The feeding method is to use Wilkinson power dividers in both polarizations, with one feed in antenna array structure resulting in one polarization.
The proposed designs were realized with the antenna substrate of 32.5 × 32.5 × 0.8 mm3 (0.45λ0×0.45λ0×0.01λ0) in the base station of 160 × 276 × 16.8 mm3. The measurement results of the single antenna show that bandwidths of the two ports are 47.28 % and 46.66 %, the antenna gain in the broadside direction is 6.41~8.51 dBi, and the isolation is better than 16 dB in the required frequency band with high directivity. The measurement results of the antenna array (each antenna substrate size is 34.5×34.5×0.8 mm3 (0.48λ0×0.48λ0×0.01λ0)) show that the bandwidths of the two ports are 48.64 % and 51.39 %, the antenna gain in the broadside direction is 9.42~13.36 dBi, and the isolation is better than 16 dB in the required frequency band with high directivity. |
參考文獻 |
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