應用於X頻段與Ka頻段系統之圓極化天線陣列設計;Design of Circular Polarization Antenna Array for X-band and Ka-band Systems

NCUIR > College of Electrical Engineering & Computer Science > Graduate Institute of Electrical Engineering > Electronic Thesis & Dissertation > Item 987654321/77629

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/77629

Title:	應用於X頻段與Ka頻段系統之圓極化天線陣列設計;Design of Circular Polarization Antenna Array for X-band and Ka-band Systems
Authors:	林儀禎;Lin, Yi-Chen
Contributors:	電機工程學系
Keywords:	圓極化陣列;28GHz
Date:	2018-07-20
Issue Date:	2018-08-31 14:50:41 (UTC+8)
Publisher:	國立中央大學
Abstract:	第五代行動通訊將會使用較高之頻段，其有高資料率、天線面積小等優點。但在高頻傳播時空氣損耗也會比較大，因此可以使用天線陣列提高增益，減少損耗造成的影響。通常天線陣列中陣列因子在每個天線單元功率平均分布時會有最大方向性。本論文利用等效電路，估算若利用傳輸線調整輸入天線功率使其平均分佈會造成之損耗，評估功率平均分布之可行性。本論文實現一線極化網格天線陣列以及圓極化貼片天線陣列，網格天線陣列傳統上具有匹配電阻，本論文將電阻拔除改由天線取代。圓極化貼片天線陣列則是將線極化輻射單元更改為右手圓形偏極化貼片天線設計而成，此陣列使用循序旋轉技術將部份天線旋轉增加軸比頻寬。28 GHz版本使用使用國家晶片系統設計中心提供之RO-FR4複合四層板製程製作，10 GHz版本使用RO5880板材製作。量測結果28 GHz及10 GHz線極化陣列天線量測頻寬分別為5.5% 和1.8%，而增益分別為7.2 dBi和12.9 dBi。28 GHz及10 GHz圓極化天線陣列量測頻寬分別為2.7% 和2.6%，軸比頻寬為1.1% 和2.3%，增益為7.3 dBic和13.6 dBic。 ;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.
Appears in Collections:	[Graduate Institute of Electrical Engineering] Electronic Thesis & Dissertation

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