本研究以設計通訊系統前端之帶通濾波器為主，利用常用之共振器結構組合而成，總共完成三種不同功能之濾波器：三頻寬止帶、四頻、及超寬頻帶通濾波器。
在三頻寬止帶帶通濾波器設計中，電路之主結構為一對均勻阻抗共振器，並利用交錯式耦合與調整開路負載樁抑制混附波，縮小電路面積。本濾波器量測結果顯示通帶之中心頻率為1.6/3.5/5.2 GHz，插入損耗為0.24/0.32/0.71 dB，另外止帶寬度可達3.3 f0，對混附波的抑制效果大於20 dB。該電路可運用於衛星通信行動地球電臺(Mobile Earth Stations, MES)及WLAN頻段上。
在四頻帶通濾波器設計中，利用與三頻概念相同之設計，電路之主結構為一對非對稱均勻阻抗共振器與一對開路負載樁，利用開路負載樁與交錯式耦合原理抑制混附波及提供額外的傳輸零點，讓通帶間能有良好的隔離性，且具有緊湊之面積。本濾波器量測結果顯示通帶之中心頻率為1.8/3.4/5.1/6.0 GHz，插入損耗為0.54/0.59/1.11/2.0 dB。該電路可運用於LTE、WLAN、5G NR以及Wi-Fi 6頻段上。
在超寬頻帶通濾波器設計中，電路之主結構為非對稱步階阻抗共振器與缺陷接地結構，透過雙層結構可達到縮小電路面積的效果。本濾波器量測結果顯示通帶之中心頻率為7.1 GHz，插入損耗為0.4 dB，頻寬比為134.9 %，可實現符合FCC於通訊系統中超寬頻之應用規範。

In this study, a tri-band bandpass filter with a wide stopband, a quad-band bandpass filter and an ultra-wideband bandpass filter are designed and fabricated. The filters with various functionalities can be applied for the front-end module of the wireless communication system.
With respect to the tri-band bandpass filter with a wide stopband, a pair of uniform impedance resonators is employed as the main structure of the filter. Moreover, a cross-coupling arrangement and open stubs are used to suppress harmonic response and minimize the size of the filter. According to the experimental result, the proposed bandpass filter has center frequencies located at 1.6/3.5/5.2 GHz with respective to insertion losses of 0.24/0.32/0.7 dB. The stopband of the filter is extended up to 3.3 f0 with a rejection level better than 20 dB. The filter is designed to meet the Mobile Earth Stations (MES) and WLAN applications.
As for the quad-band bandpass filter, a pair of asymmetric uniform impedance resonators and a pair of open stubs are employed as the main structure of the filter. Moreover, a cross-coupling arrangement and open stubs are used to suppress harmonic response and to create transmission zeros close to each passband edge, resulting in high selectivity, good isolation, and compact size. According to the experimental result, the proposed bandpass filter has center frequencies located at 1.8/3.4/5.1/6.0 GHz with respective to insertion losses of 0.54/0.59/1.11/2.0 dB. The filter is designed to meet the LTE, WLAN, 5G NR and Wi-Fi 6 applications.
The ultra-wideband bandpass filter is designed based on one asymmetric stepped impedance resonator with defected-ground structure. A multilayer structure is able to, reduce circuit size. According to the experimental result, the proposed bandpass filter has a center frequency located at 7.1 GHz with an insertion loss of 0.4 dB, and the fractional bandwidth is 134.9%. The filter meets FCC’s ultra-wideband application specifications in communication systems.

中文摘要
Abstract
致謝
目錄
圖目錄
表目錄
第1章 序論
1.1 研究背景
1.2 射頻濾波器介紹
1.2.1 射頻濾波器種類
1.2.2 平面式微帶線濾波器
1.3 實驗室歷年研究成果
1.4 研究動機
1.5 論文架構
第2章 研究方法
2.1 濾波器製作流程
2.2 電路雕刻機製作電路
2.3 印刷電路板感光乾膜製程
2.4 向量網路分析儀量測
第3章 均勻阻抗共振器分析
3.1 序論
3.2 分析均勻阻抗共振器
3.3 耦合分析
3.3.1電耦合
3.3.2 磁耦合
3.3.3 混合式耦合
3.3.4 耦合係數分析
3.3.5 外部品質因素分析
3.4 傳輸零點
3.4.1 開路負載樁
3.4.2 多重傳輸路徑
第4章 具均勻阻抗共振器之多頻帶帶通濾波器
4.1 三頻寬止帶帶通濾波器
4.1.1 相關文獻回顧
4.1.2 介紹
4.1.3 三頻寬止帶帶通濾波器設計
4.1.4 耦合方式
4.1.5 濾波器電路
4.1.6 結果與討論
4.2 四頻帶通濾波器
4.2.1 相關文獻回顧
4.2.2 介紹
4.2.3 四頻帶通濾波器設計
4.2.4 濾波器電路
4.2.5 結果與討論
第5章 缺陷接地結構之超寬頻帶通濾波器
5.1 相關文獻回顧
5.2 介紹
5.3 缺陷接地結構之超寬頻帶通濾波器電路設計
5.3.1 濾波器電路
5.3.2 結果與討論
第6章 結論與未來工作
參考文獻

[1]P. A. Rizzi, Microwave Engineering: Passive Circuits, Prentice Hall, 1987.
[2]Sam Churchill, Wireless Recon Airplanes, Daily wireless, 2005.
[3]IEEE 802 Standard, http://www.ieee.org/, Accessed: Jul. 17, 2021.
[4]CDMA Develop Group, http://www.cdg.org/, Accessed: Jul. 17, 2021.
[5]Different Wi-Fi Protocols and Data Rates, https://www.intel.com.tw/, Accessed: Jul. 17, 2021.
[6]LTE frequency bands, https://en.wikipedia.org/, Accessed: Jul. 17, 2021.
[7]D. K. Cheng, Field and Wave Electromagnetics, Addison Wesley, 1989.
[8]Ultra-Wideband (UWB) Technology, http://park12.wakwak.com/, Accessed: Jul. 17, 2021.
[9]國家通訊傳播委員會，低功率射頻電機技術規範，https://www.ncc.gov.tw/，蒐尋日期：民110年7月17日。
[10]Characteristics impedance of symmetrical networks, constant k, low pass, high
pass, band pass, https://www.brainkart.com/, Accessed: Jul. 17, 2021.
[11]Q factor, https://en.wikipedia.org/wiki/Q_factor/, Accessed: Jul. 17, 2021.
[12]Planar transmission line, https://en.wikipedia.org/wiki/Planar_transmission_line/, Accessed: Jul. 17, 2021.
[13]M. Jiang, M. H. Wu, and J. T. Kuo, “Parallel-coupled microstrip filters with over-coupled stages for multispurious suppression,” IEEE MTT-S International Microwave Symposium Digest, pp. 687-690, Jun. 2005.
[14]翁敏航，射頻被動元件設計，東華書局股份有限公司，西元2007年3月。
[15]H. W. Liu, Y. Wang, X. M. Wang, J. H. Lei, W. Y. Xu, Y. L. Zhao, B. P. Ren, and X. H. Guan, “Compact and high selectivity tri-band bandpass filter using multimode stepped-impedance resonator,” IEEE Microwave and Wireless Components Letters, vol. 23, no. 10, 536-538, Oct. 2013.
[16]C. R. Chen, “Wide stopband single-band and multi-band bandpass filters using uniform impedance resonators,” Master Thesis, National Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan, 2015.
[17]X. Y. Zhang, J. X. Cheng, Q. Xue, and S. M. Li, “Dual-band bandpass filters using stub-loaded resonators,” IEEE Microwave and Wireless Components Letters, vol. 17, no. 8, pp. 583-585, Aug. 2007.
[18]R. H. Geschke, B. Jokanovic, and P. Meyer, “Filter parameter extraction for triple-band composite split ring resonators and filers,” IEEE Transactions on Microwave Theory and Techniques, vol. 59, no. 6, pp. 1500-1508, Jun. 2011.
[19]L. Y. Ren, “Tri-band bandpass filters based on dual-plane microstrip/DGS slot structure,” IEEE Microwave and Wireless Components Letters, vol. 20, no. 8, pp. 429-431, Aug. 2010.
[20]F. L. Zhao, M. H. Weng, C. Y. Tsai, R. Y. Yang, H. Z. Lai, and S. K. Liu, “A miniaturized high selectivity band-pass filter using a dual-mode patch resonator with two pairs of slots,” Microwave and Optical Technology Letters, vol. 62, no. 3, pp. 1145-1151, Mar. 2020.
[21]劉伊婷，超寬頻環型帶通濾波器及雙工器之研究，碩士論文，國立高雄科技大學光電與通訊研究所，高雄，2008。
[22]洪嘉和，多頻帶、多重混附波抑制與超寬頻帶通濾波器之研究，碩士論文，
國立高雄科技大學光電與通訊研究所，高雄，2010。
[23]鄭富中，使用步階阻抗樁負載共振器設計多頻與寬頻濾波器，碩士論文，國立高雄科技大學光電與通訊研究所，高雄，2011。
[24]鍾秉邑，使用非對稱式均勻阻抗負載樁共振器設計多頻帶通濾波器，碩士論 文，國立高雄科技大學光電與通訊研究所，高雄，2013。
[25]陳啓榮，使用均勻阻抗共振器設計單頻寬止帶以及多頻帶通濾波器，碩士論 文，國立高雄科技大學光電與通訊研究所，高雄，2015。
[26]劉佳鴻，適用於藍芽及WiMAX規格之寬止帶帶通濾波器，碩士論文，國立 高雄科技大學光電與通訊研究所，高雄，2015。
[27]林芳妤，使用均勻阻抗共振器設計用於通訊系統之多工器，碩士論文，國立高雄科技大學光電與通訊研究所，高雄，2015。
[28]楊騰毅，使用均勻阻抗共振器設計超寬頻及多頻帶通濾波器，碩士論文，國立高雄科技大學光電與通訊研究所，高雄，2016。
[29]蔡易成，使用均勻阻抗負載樁共振器設計多頻寬止帶帶通濾波器與雙工器， 碩士論文，國立高雄科技大學光電與通訊研究所，高雄，2017。
[30]賴宏政，基於共面波導結構之超寬頻帶通濾波器設計，碩士論文，國立高雄科技大學光電工程研究所，高雄，2020。
[31]M. H. Weng, F. Z. Zheng, H. Z. Lai, and S. K. Liu, “Compact ultra-wideband bandpass filters achieved by using a stub-loaded stepped impedance resonator,” Electronics, vol. 9, no. 2, p. 209, Jan. 2020.
[32]劉世崑、楊騰毅、劉佳鴻、林芳妤、陳啟榮，具均勻阻抗結構之超寬頻濾波器，中華民國發明專利第I569575號。
[33]K. W. Hsu and W. H. Tu, “Design of a compact wide stopband bandpass filter using meandering uniform-impedance resonators,” 2009 Asia-Pacific Microwave Conference Proceedings, pp. 2522-2525, 2009.
[34]C. W. Tang, C. H. Teng, and J. M. Sun, “Design of wide stopband microstrip bandpass filter with assistance of spur lines,” Electronics Letters, vol. 50, no. 15, pp. 1065-1067, Jul. 2014.
[35]S. J. Zeng, “Compact and high-isolation multiplexers using long feeding lines, Master Thesis,” National Central University, Taoyuan, Taiwan, 2010.
[36]P. Mondal and M. K. Mondal, “Design of dual-bandpass filters using stub-loaded open-loop resonators,” IEEE Transactions on Microwave Theory and Techniques, vol. 56, no. 1, pp. 150-155, Jan. 2008.
[37]X. Y. Zhang, J. X. Chen, Q. Xue, and S. M. Li, “Dual-bandpass filters using stub-loaded resonators,” IEEE Microwave and Wireless Components Letters, vol. 17, no. 8, pp. 583-585, Aug. 2007.
[38]L. Han, K. Wu, and X. Zhang, “Development of packaged ultra-wideband bandpass filter,” IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 1, pp. 220-228, Jan. 2010.
[39]J. S. Hong and M. J. Lancaster, Microstrip Filters for RF/Microwave Application, New York, Wiley, 2001.
[40]S. W. Lan, M. H. Weng, S. J. Chang, C.-Y. Hung, and S. K. Liu, “A tri-band bandpass filter with wide stopband using asymmetric stub-loaded resonators,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 1, pp. 19-21, Jan. 2015.
[41]Pan Geng, S. Yang, Zheng Xu, and Tao Chen, “Compact tri-mode microstrip filter with wide- stopband using asymmetric stub loaded resonators,” 2016 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications, pp. 1-3, Jul. 2016.
[42]Z. Zhao, S. Li, J. Zhu, M. Qu, and Y. Kang, “A tri-band bandpass filter with wide stop band based on quad-mode stub loaded resonator” 2017 IEEE 5th International Symposium on Electromagnetic Compatibility, pp. 1-4, Oct. 2017.
[43]N. Kumar and Y. K. Singh, “Compact tri-band bandpass filter using three stub-loaded open-loop resonator with wide stopband and improved bandwidth response,” Electronics Letters, vol. 50, no. 25, pp. 1950-1952, Dec. 2014.
[44]L. Wang and B. R. Guan, “Design of high selectivity tri-band bandpass filter with wide upper stopband,” International Journal of RF and Microwave Computer-Aided Engineering, vol. 23, no. 3, pp. 328-333. May, 2012.
[45]F. Wei, Y. J. Guo, X. W. Shi, and P. Y. Qin, “Design of multi-band bandpass filters based on stub loaded stepped-impedance resonator with defected microstrip structure,” IET Microwaves, Antennas & Propagation, vol. 10, no. 2, pp. 230-236, 2016.
[46]M. Yu, L. Bing, G. Zijun, Z. Renrong, W. Xiangyun, X. Wenqiang, and W. Yuting, “A compact quad-band bandpass filter with high skirt selectivity based on stub-loaded resonators and λ/4 resonators,” 2018 IEEE MTT-S International Wireless Symposium, pp. 1-4, May, 2018.
[47]B. S. Virdee, M. Farhat, and M. Riaz, “Compact quad-band bandpass filter based on stub-loaded resonators,” 2017 IEEE MTT-S International Microwave Symposium, pp. 1927-1929, Jun. 2017.
[48]J. Y. Wu and W. H. Tu, “Design of quad-band bandpass filter with multiple transmission zeros,” Electronics Letters, vol. 47, no. 8, pp. 502-503, Apr. 2011.
[49]K. W. Hsu and W. H. Tu, “Sharp-rejection quad-band bandpass filter using meandering structure,” Electronics Letters, vol. 48, no. 15, pp. 935-936, Jul. 2012.
[50]D. Bukuru, K. Song, F. Zhang, Y. Zhu, and M. Fan, “Compact quad-band bandpass filter using quad-mode stepped impedance resonator and multiple coupling circuits,” IEEE Transactions on Microwave Theory and Techniques, vol. 65, no. 3, pp. 783-791, Jul. 2017.
[51]J. Huang, J. Wen, and M. Huang, “Design of a compact planar UWB filter for wireless communication applications,” 2009 International Conference on Wireless Communications & Signal Processing, pp. 1-4, Nov. 2009.
[52]J. Lee and Y. Kim, “Ultra-wideband bandpass filter with improved upper stopband performance using defected ground structure,” IEEE Microwave and Wireless Components Letters, vol. 20, no. 6, pp. 316-318, Jun. 2010.
[53]L. Han, K. Wu, and X. P. Chen, “Compact ultra-wideband bandpass filter using stub-loaded resonator,” Electronics Letters, vol. 45, no. 10, pp. 504-505, May, 2010.
[54]M. Makimoto and S. Yamashita, “Bandpass filters using parallel coupled stripline stepped impedance resonators,” IEEE Transactions on Microwave Theory and Techniques, vol. 28, no. 12, pp. 1413-1417, Dec. 1980.
[55]A. Kamma, G. S. Ready, P. Suggisetti, and J. Mukherjee, “A novel and compact ultra-wide band (UWB) filter using modified split ring resonator (MSRR),” 2014 IEEE International Microwave and RF Conference, pp. 69-71, Dec. 2014.
[56]A. Taibi, M. Trabelsi, A. Slimane, M. T. Belaroussi, and J. Raskin, “A novel design method for compact UWB bandpass filters,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 1, pp. 4-6, Jan. 2015.
[57]M. H. Weng, C. S. Ye, Y. K. Su, and S. W. Lan, “A new compact quad-band bandpass filter using quad-mode stub loaded resonator,” Microwave and Optical Technology Letters, vol. 56, no. 7, pp. 1630-1632, Oct. 2014.
[58]K. A. Ansal, D. S. Jose, A. S. Kumar, and T. Shanmugantham, “A band pass coupled line filter with DGS for ultra-wide band application,” Procedia Computer Science, vol. 171, pp. 561-567, 2020.