應用於2.45GHz頻段之雙圓極化,多波束之相位陣列天線設計

Design of Phased Array Antennas with a Dual-Circular Polarization and Multi-Beam Operation

張正義(Cheng-I Chang)

指導教授 ： 周錫增

元智大學/電機通訊學院/通訊工程學系/碩士(2012年)

摘要

本研究主要希望透過陣列天線之間，位置相位差的方式來建置圓極化天線，並使其在有限的設計空間內可達到左旋圓極化及右旋圓極化以及多波束的設計，再透過與後端電路整合及增加陣列天線的方式來得到良好的天線增益，使之為一實用的陣列天線系統。
在規劃中，希望能建置一具有三個左旋圓極化及三個右旋圓極化的天線，並且各自朝不同的方向輻射。故在規劃時係以2X2 之陣列天線來組成一個圓極化天線，此四個天線之間位置皆相差90度，並希望能夠以Power Divider之電路架構，來使各個天線單元的功率是均等的，且在設計其電路時把四個天線單元所需要的相位偏移加上，使四個天線皆可以在想要輻射的方向得到同相位，以得到2X2之陣列最大的天線增益。而為了補償電路上的能量損失，利用增加一組2X2之陣列天線的方式使其天線增益維持在一定的效能。另外在相同面積下往上再多設計六組2X4的陣列天線，此種結構有助於在維持相同面積的條件下而達成雙圓極化及多波束之天線設計。

關鍵字

多波束 ； 雙圓極化 ； 相位陣列

並列摘要

The research intended to design a dual-circular polarization and multi-beam operation phase array antenna in limited size by phase adjusting and space displacing of antenna elements. It was integrated with front end RF circuit and multi-layer architecture to accomplish good antenna gain for establishing a practical antenna array system.
This research was planned to build up a multi-beam operation phase array with three left-hand and three right-hand circular polarizations. The circular polarization antenna is accomplished with 2*2 array. Every elements of this array is 90 degree space displacing, and the power divider is used for equalizing the input power. In order to get the maximum antenna gain, the phase requirements are considered in power divider circuit to implement the in-phase design in required radiation direction. Another 2*2 array is added in identical plane for covering the loss of power divider circuit to keep antenna efficiency. Six layers 2*4 array design is helpful to achieve dual-circular polarization and multi-beam phase array in limited design area.

並列關鍵字

Multi-Beam ； Dual-Circular Polarization ； Phased Array

參考文獻

Circular Polarization Antennas”,逢甲大學,2010.

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