Omnidirectional Circularly Polarized Antenna for 5G Communication and Millimeter-wave Antenna Array Design

• Main Authors: Guan-Yi Li, 李冠毅
• Other Authors: Tzyh-Ghuang Ma
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/4u5q43

碩士 === 國立臺灣科技大學 === 電機工程系 === 106 === This thesis consists of two independent researches. In the first part, A circularly polarization omnidirectional antenna which is applied to 5G communication is proposed and demonstrated. The essence of this research is combining two different kinds of antenna in order to achieve the characteristic of omnidirectional radiation pattern and circularly polarization. Two kinds of antenna are dipole and zeroth-order resonator respectively. Because both of them are linear polarization and omnidirectional radiation pattern, the the characteristic of omnidirectional radiation pattern and circularly polarization can be achieved as long as they are combined in physical space with 90 degree. This research is especially applied to 5G small base station in the future. Secondly, a design of millimeter wave antenna array is studied. This part includes two kinds of antenna array which are both designed at 24.15 GHz. One antenna is called series-fed combline microstrip patch fed at the center. Compared with traditional microstrip patch antenna, combline array has much higher gain and wider beamwidth due to boundary condition and polarization. With this characteristic, the antenna can detect much farther and wider object in the front. The other antenna is also called series-fed combline microstrip patch but fed from the side. Because this type of antenna has much wider beamwidth and satisfy the request that the phase difference between two receivers in FMCW radar system must be linearly descending, it serves as receiver part rather than transceiver part. This thesis includes design idea, RF circuits simulated and measured results. The simulation and measurement results show good agreement.