| dc.description.abstract | The fifth-generation mobile communication is likely to use higher frequency bands which have advantages such as high data rate and small antenna size. Nevertheless, the path-loss during high-frequency propagation will also be relatively large. Therefore, the antenna array can be used to increase the gain and reduce the impact of the loss.
The array factor in the antenna array will have a maximum value of directivity when antenna is excited uniformly. This thesis uses the equivalent circuit to estimate the loss of the transmission line to adjust the input antenna power to achieve uniform-distributed elements. To evaluate the feasibility of the average power distribution. In this thesis, a linearly polarized grid antenna array and a circularly polarized patch antenna array are realized. Grid antenna arrays traditionally have matching resistor. In this thesis, the resistance is replaced by an antenna. The circularly polarized patch antenna array is designed by changing the linearly polarized radiation element to a right-hand circularly polarized patch antenna. This array uses sequential rotation technology to rotate some of antennas and increase the axial ratio bandwidth. The 28-GHz antenna arrays use the RO-FR4 composite four-layer board process provided by the National Chip Implementation Center. The 10-GHz version uses RO5880 PCB.
The measured bandwidths of the 28-GHz and 10-GHz linearly polarized array antennas are 5.5% and 1.8%, respectively, and the gains are 7.2 and 12.9 dBi, respectively. The measured bandwidths of the 28-GHz and 10-GHz circularly polarized antenna arrays are 1.8% and 2.6%, respectively, the axial ratio bandwidths are 1.1% and 2.3%, and the gains are 7.3 and 13.6 dBic respectively.
The fifth-generation mobile communication is likely to use higher frequency bands which have advantages such as high data rate and small antenna size. Nevertheless, the path-loss during high-frequency propagation will also be relatively large. Therefore, the antenna array can be used to increase the gain and reduce the impact of the loss.
The array factor in the antenna array will have a maximum value of directivity when antenna is excited uniformly. This thesis uses the equivalent circuit to estimate the loss of the transmission line to adjust the input antenna power to achieve uniform-distributed elements. To evaluate the feasibility of the average power distribution. In this thesis, a linearly polarized grid antenna array and a circularly polarized patch antenna array are realized. Grid antenna arrays traditionally have matching resistor. In this thesis, the resistance is replaced by an antenna. The circularly polarized patch antenna array is designed by changing the linearly polarized radiation element to a right-hand circularly polarized patch antenna. This array uses sequential rotation technology to rotate some of antennas and increase the axial ratio bandwidth. The 28-GHz antenna arrays use the RO-FR4 composite four-layer board process provided by the National Chip Implementation Center. The 10-GHz version uses RO5880 PCB.
The measured bandwidths of the 28-GHz and 10-GHz linearly polarized array antennas are 5.5% and 1.8%, respectively, and the gains are 7.2 and 12.9 dBi, respectively. The measured bandwidths of the 28-GHz and 10-GHz circularly polarized antenna arrays are 1.8% and 2.6%, respectively, the axial ratio bandwidths are 1.1% and 2.3%, and the gains are 7.3 and 13.6 dBic respectively. | en_US |