臺灣博碩士論文加值系統

在本論文，我們設計與製作兩個寬頻的緩變槽線天線(Tapered Slot Antennas)，其各以不同的結構來激發，其中一個是用鰭線(Finline)傳輸線作激發，並且能操作在整個毫米波的Ka頻段，於中心頻率35GHz，本天線的增益為16.6dBi。另外一個天線是利用一種新的共平面波導(CPW)轉共平面帶線(CPS)轉接器當作饋入機構，此天線具有非常大的頻寬，從2GHz 到18GHz都能運用。此外，還介紹以皺摺邊緣(Corrugated Edges)結構來改善較高頻帶的幅射場型。最後，我們建立漏波模的幅射模型，並且，在較高的頻率能與實際量測結果相吻合。

In this thesis, we designed and fabricated two wide-band tapered slot antennas (TSA) which were fed by different structures. One was fed by finline transmission lines and operated in the full Ka-band (26.5~40.0GHz). The measured gain is 16.6dBi at the center frequency 35GHz. The other antenna was fed by a new coplanar waveguide (CPW) to coplanar strip (CPS) balun. This antenna has a very wide bandwidth from 2 to 18GHz. In addition, a corrugated-edge structure was introduced to improve the radiation patterns in the higher frequency band. Finally, a leaky-wave radiation model was established and the computed radiation patterns corresponded with the measured results in the higher frequency band.

Abstract (Chinese) …………………………………………................................… i
Abstract (English) ……………………………………………................................ ii
Acknowledgements …………………………………...............................………. iii
Contents ……………………………………………………................................ iv
List of Table ………………………………………………...............................… vi
List of Figures ……………………………………………...............................… vii
Chapter 1 Introduction ………………………………….......................................... 1
Chapter 2 Analytical Methods ……………...................................………………… 3
2.1 Stepped Approximation Method for the Tapered Slot Antennas …….……..…… 3
2.2 Analysis of Uniform Slotline with Finite Conductor by the Spectral
Domain Approach ……………………………………………………......….. 3
2.2.1 Green's Function …………………………………………………………. 3
2.2.2 Current Basis Assumptions ………………………………………………. 4
Chapter 3 Finline Feed for the Ka-band Tapered Slot Antennas ……………………. 6
3.1 Characteristics of Finlines …………………………………………………….. 6
3.2 Tapered Finline Transition Design ……………………………………………. 6
3.3 Antennas Design Considerations ……………………………...……………… 7
3.3.1 Effect of Dielectric Thickness and Constant ………………………………... 8
3.3.2 Effect of Tapered Angle ………………………………………………...... 8
3.3.3 Effect of Length …………………………………………………………... 8
3.4 Measurement of Antenna Radiation Patterns …………………………………. 9
Chapter 4 Design of a Broadband Tapered Slot Antenna ……………………..…... 21
4.1 A New Broadband Balun …………………………………………...………. 21
4.2 Measured Results of the Antenna …………………………....………………. 22
4.3 Improved Radiation Patterns by Corrugated Edges ……………..……………. 22
Chapter 5 Calculation of Radiation Pattern …………...........................................…. 28
Chapter 6 Conclusions …………..………………………..................................... 33
References ……………………………..…………………….............................. 34
Appendix …………………………………………………............................…. 36

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