| 摘要(英) |
A design of circularly polarized grid antenna array with double series-fed configuration for millimeter-wave applications will be proposed in the thesis. In the design, two linearly-polarized grid antenna arrays are combined to form a circularly polarized grid antenna array with double series-fed configuration. In the fifth-generation wireless systems, a higher frequency band will be used. Due to the path loss will be larger in high-frequency propagation, the antenna gain is often increased in the form of an antenna array. The proposed design will accommodate the frequency band 26.5GHz-28.9GHz of the fifth-generation wireless systems, mainly used in South Korea.
In the past, the design of circularly polarized antennas were mostly irregular patch-shaped, and most of their parameters were coupled together. It is not easy to fine-tune these parameters. The size of the antenna is reduced in the millimeter wave. The error in the manufacturing process will seriously affect the antenna characteristics, so this paper proposed a relatively simple antenna array design. First, we designed two linearly polarized antenna arrays, and then arranged the antennas in orthogonal directions. We fed the arrays with the same amplitude and 90 degree phase difference by using a power divider, so that the array has circular polarization characteristics.
The measured bandwidth of the circularly polarized grid antenna array with double series-fed configuration is 20.9%, the axial ratio bandwidth is 9.9%, and the gain is 5.4dBic. The measured bandwidth of the circularly polarized grid antenna array with double series-fed configuration is 18.1%, the axial ratio bandwidth is 2%,1.2%, and the gain is 9.79 dBic. |
| 參考文獻 |
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[11] H-L,Jian, “Design of Switch Antenna Array for X-Band and Ka-Band Systems ”, Master dissertation ,National Central University,2015. |
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