臺灣博碩士論文加值系統

　　在本論文中，我們提出兩種可應用於24ＧＨｚ汽車防撞雷達(Automotive Collision-Avoidance Radar)之前端天線，並對汽車防撞雷達系統的基本需求予以說明。本論文所提出的天線皆為微帶洩漏波天線，具有結構簡單、低成本，且高增益、高輻射效率等優點。
　　本論文所提出的天線結構，其基本形式皆為微帶洩漏波天線，利用槽孔耦合方式激發第一高階模，以多段微帶線輻射及波合成的方式來達成符合汽車防撞雷達前端天線的場型需求，此外，並利用波導模型予以計算天線輻射場型。
　　第一種類型之天線，是由微帶線中央饋入，產生雙波束場型，並與1×8洩漏波陣列組成三個波瓣，並利用微帶線的差異，可得到兩種涵蓋範圍不同的天線﹔第二種類型，是利用多段微帶線輻射的方式，以達成兩個固定角度且寬波瓣的波束，其兩波束的夾角且約為90∘，增益為13.2 dBi。

　　In this thesis, we propose two kinds of antenna array to apply to automotive collision-avoidance radar at 24 GHz, and provide the illustration of the basic system requirements for automotive collision-avoidance radar. The foundations of all proposed antennas in this thesis are microstrip leaky-wave antennas with low profile, low cost, high directivity, and high radiation efficiency.
　　The structure of all proposed antennas in this thesis are microstrip leaky-wave antenna with aperture-coupled feed, operating in first higher order mode. We can obtain the radiation patterns conformed with the system requirements for automotive collision-avoidance radar by use of wave-composed and multi-section radiation. Besides, the waveguide model is used to calculate the radiation pattern.
The first kind of antennas are fed from the center of microstrip line produce dual-beam, composing with 1×8 leaky-wave array, and we can obtain three beam pattern. Besides, we can change the structure of microstrip line to obtain antennas with different radiation pattern﹔The second is dual-beam with fixed beam and broad-beamwidth by use of multi-section microstrip line, whose included angle between the dual-beam is about 90°, and peak-gain is about 13.2 dBi at 24 GHz.

目　錄
第一章 序論…………………………………………………………1
1.1　工作動機…………………………………………………………1
1.2　章節介紹…………………………………………………………3
第二章 基本原理及特性……………………………………………4
2.1　洩漏波天線的一般及其特性……………………………………4
　　　　2.2　槽孔耦合饋入的原理及特性…………………………6
　　　　2.3　微帶洩漏波天線的應用………………………………7
第三章 前向汽車防撞雷達前端天線之設計………………………8
3.1　前言………………………………………………………………8
3.2　設計流程………………………………………………10
3.2.1　1×8洩漏波天線陣列之設計…………………….11
3.2.2 雙埠三波束天線之設計……………………………………14
3.2.3 影響天線輻射場型的因素…………………………………24
3.3　天線陣列設計…………………………………………25
　　　　　3.3.1　饋入網路之設計…………………………………25
3.3.2 量測結果比較………………………………………………27
3.3.3 1×4天線陣列與單一天線量測結果比較………………….32
第四章 側向汽車防撞雷達前端天線之設計……………………….33
4.1　前言……………………………………………………33
4.2　設計流程………………………………………………34
4.2.1　單一天線設計……………………………………36
4.2.2 1×4天線陣列設計……………………………….39
第五章　結論………………………………………………………….43
參考文獻……………………………………………………………….44

參 考 文 獻
[1] Porter, B.G.; Gearhart, S.S.,” 77 GHz dual polarized slot-coupled patches on Duroid with Teflon lenses for automotive radar systems,” Antennas and Propagation Society International Symposium, 1998. IEEE, Volume: 1, 21-26 Jun 1998 , vol.1,pp. 332 -335
[2] Kolak, F.; Eswarappa, C.,” A low profile 77 GHz three beam antenna for automotive radar,” Microwave Symposium Digest, 2001 IEEE MTT-S International, Volume: 2 , 2001, vol.2,pp. 1107 -1110
[3] Luxey, C.; Latheurte, J.-M.,” Simple design of dual-beam leaky-wave antennas in microstrips,” Microwaves, Antennas and Propagation, IEE Proceedings , Volume: 144 Issue: 6 , Dec 1997 ,pp. 397 —402
[4] Rohling, H.; Meinecke, M.-M.; Mott, K.; Urs, L.,” Research activities in automotive radar,” Physics and Engineering of Millimeter and Sub-Millimeter Waves, 2001. The Fourth International Kharkov Symposium on, Volume: 1 , 2001, vol.1,pp. 48 -51
[5] Reed, J.C.,” Side zone automotive radar,” Radar Conference, 1997., IEEE National , 13-15 May 1997,pp. 186 —190
[6] Denisenko, V.V.; Shubov, A.G.; Majorov, A.V.; Egorov, E.N.; Kashaev, N.K.,” Millimeter-wave printed circuit antenna system for automotive applications,” Microwave Symposium Digest, 2001 IEEE MTT-S International, Volume: 3 , 2001, vol.3,pp. 2247 -2250
[7] K. Inomata, S. Noda, K. Okazaki, M. Watanabe, T. Fukae, K. Matsuoka, “24GHz Side-looking radar for vehicular applications,” Signals, Systems and Computers, 2000. Conference Record of the Thirty-Fourth Asilomar Conference on, Volume: 2, pp. 1131-1134, 2000.
[8] S. D. Thompson, “A microwave radar for vehicular applications,” IEEE 1996 Microwave and Millimeter-wave monolithic circuits symposium, pp7-9.
[9] Si, D.D.; Luo, S.C.; Pero, C.; Xiaodong Wu; Knox, R,” Millimeter-wave FMCW/monopulse radar front-end for automotive applications,”Microwave Symposium Digest, 1999 IEEE MTT-S International, Volume: 1 , 1999, vol.1,pp.
277 -280
[10] W. Menzel, “A new travelling-wave antenna in microstrip, “ Arch. Electron. Ubertrag. Tech., 33,pp137-140,1979.
[11] A. A. Oliner and K. S. Lee, “The nature of the leakage from higher-order modes on microstrip line,” in 1986 IEEE MTT-S Int. Microwave Symp. Dig., Baltimore, 1986, pp. 57-60.
[12] D. M. Pozar, “A microstrip antenna aperture coupled to a microstrip line,”Elcetron. Lett., vol.21, pp.49-50, Jan. 17,1985
[13] Munson, R.,” Conformal microstrip antennas and microstrip phased arrays,” Antennas and Propagation, IEEE Transactions on [legacy, pre - 1988], Volume: 22 Issue: 1 , Jan 1974 ,pp. 74 -78
[14] T.-L. Chen and Y.-D. Lin, “A K-band aperture-coupled microstrip leaky-wave
antenna,” 1999 July IEICE Trans. on Electronics, pp. 1236-1241.
[15] J. M. Lin and G. J. Chou, C.-K.C. Tzuang, S. Su , “Short leaky-wave antennas
of sum and difference patterns,” Electronic Letters, vol.32 no.14, pp. 1247-1249
July 1996.
[16] Tsai-Pi Hung; Tzuang, C.K.C,” 38 GHz high-directivity planar leaky-mode
antenna array,”Microwave Conference, 2001. APMC 2001. 2001 Asia-Pacific ,
2001 , vol.2,pp. 962 -965
[17] Carrez, F.; Vindevoghel, J.,” Compact two-port microstrip antenna,”
Electronics Letters , Volume: 32 Issue: 15 , 18 Jul 1996 ,pp. 1337 —1338
[18] Wen-Jen Tseng; Shyh-Jong Chung,” Analysis and application of a two-port
aperture-coupled microstrip antenna,” Microwave Theory and Techniques, IEEE
Transactions on , Volume: 46 Issue: 5 , May 1998 ,pp. 530 —535
[19] W. Hong, Tai-Lee Chen, J.-W. Sheen, Y.-D. Lin and C.-Y. Chang, ” Broadband
tapered microstrip leaky-wave antenna ,” revised for IEEE Trans. on Antennas and propagation.
[20] Tai-Lee Chen, Shih-Hung Wang, and Yu-De Lin,” Microstrip Leaky-Wave Antenna for Automotive Radar Applications,” to be published in 2003 TSMMW.