可涵蓋X-band至Ka-band 平面式指向陣列天線設計

Design of planar End-fire Array Antenna Covering X-Band to Ka-Band.

尤士瑋(Shi-Wei You)

指導教授 ： 許恒通

元智大學/電機通訊學院/通訊工程學系/碩士(2012年)

摘要

本研究主要利用兩種不同頻率元件之Vivaldi寬頻天線，去改善單一Vivaldi天線之場型主波束集中的缺失。天線頻段整合X-band至Ka-band頻帶，由於設計於微波高頻帶，在實作上使用Rogers RO4003、εr=3.38、 thickness=0.508mm的平面基板實現之。論文中也討論了如何分析Vivaldi天線最佳化設計，以及對數週期偶極天線(Logic Periodic Dipole Antenna)設計寬頻概念。利用週期性結構其電氣長度不一的偶極子作結合，取得寬頻的阻抗匹配同時也可兼顧均勻的增益與高效率的主波束輻射。再以兩組不同頻段的Vivaldi天線利用對數週期偶極天線陣列概念將其組合。元件以低頻 為間距，適當相位補償、最後再以一個寬頻的饋入網路相結合，使全頻段之輻射場型均有指向性效果。對於之後的實際應用將有極大效益，其中相關細節將於本論文分析與討論。

關鍵字

共面式槽線天線 ； 對數週期偶極天線

並列摘要

In this research, we use two Vivaldi antenna elements operating at different frequencies to solve the problem of the split in main beam of the radiation pattern for single antenna case. Such configuration also exhibits a very wideband performance covering X- to Ka-band with good impedance match, moderate gain and highly directive beam in the end-fire direction. The antenna prototype was built on RO 4003 substrate with dielectric constant of 3.38 and thickness of 0.508 mm. The discussions on the optimal design of single Vivaldi antenna element together with the operating principle of Log-Periodic antennas to achieve wideband performance are also included. Combination of the design concept of Log-Periodic antennas with wideband antenna element was adopted in the design of two-element end-fire array from X- to Ka-band. Detailed design procedures including the phase compensation and feeding network design are covered in the thesis.

並列關鍵字

Vivaldi antenna ； log-periodic dipole antenna

參考文獻

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