微波是波長介於1毫米和1米之間的電磁波，或者以300 MHz和300 GHz之間的頻率表示。有許多使用微波的應用，為了實現微波應用所需的特性，有必要運用共模雜訊濾波器(CMF)以減少來自共模(CM)雜訊的干擾。雷達為使用微波的應用，有許多使用雷達的應用案例，包括測量人體生命體徵的應用。
在簡介之後，本文的第一部分，考慮一個單頻帶共模雜訊濾波器，提出了一種單波段串聯吸收共模濾波器（ACMF），ACMF嵌入在四層印刷電路板(PCB)中，並且由三部分組成：反射共模濾波器(RCMF)、匹配電路和吸收器。RCMF採用蘑菇型設計，匹配電路採用曲折線設計以減小濾波器尺寸，吸收器是一個串聯電阻。設計工作頻率為 2.45 GHz，從模擬來看，其測量結果如下：CM（Scc21）在2.61 GHz頻率下的插入損耗為-22.49 dB，Scc11在2.5 GHz頻率下為-18.62 dB，差模（DM）信號在0 - 8 GHz頻率範圍內，可通過-1 dB的非常小的插入損耗(Sdd21)保持完整性，在2.54 GHz頻率範圍內實現的吸收效率(AE)為93%，提出的ACMF尺寸為10.3 mm x 4.6 mm。比例頻寬為19 %。製作的測量結果與模擬結果相差不大，分別為：Scc21在2.31GHz頻率下為-17.87dB，Scc11在2.38GHz頻率下為-20.87dB，Sdd21在2.38GHz頻率下為-2.8dB在0–8 GHz的頻率範圍內，2.32 GHz 頻率的吸收效率為97 %，比率頻寬為17 %。這意味著設計的模擬可以實現接近設計計算的結果。
在本文的第二部分，我們考慮了一個雙頻帶共模雜訊濾波器，解釋了一種具有寬頻抑制和雙頻帶高吸收共模濾波器的共模雜訊濾波器，稱為吸收式共模濾波器（ACMF）。該濾波器由反射型共模濾波器(RCMF)、相位匹配器和吸收器構成。它由三層組成，尺寸為14.98 mm × 9.585 mm，通過設定多個傳輸零點可以實現寬頻共模雜訊抑制，通過使用雙波段相位匹配和吸收器，可以實現雙波段吸收。頻率分別在2.4 GHz至2.5 GHz 和5.17 GHz至5.33 GHz範圍內，在這些頻率處的傳輸零點和吸收點的設定導致高吸收效率。模擬結果顯示，低於-10 dB的共模抑制範圍為2 GHz至11 GHz，比率頻寬為 138%，差模(DM)信號在DC至12 GHz範圍內保持完整性，兩個頻率段的吸收效率分別為97%和96%，實驗結果與模擬結果僅略有不同。
在本文的第三部分，我們討論了調頻連續波雷達，敏感皮膚患者的心跳頻率和呼吸頻率的測量，例如燒傷皮膚，是非常困難的，尤其是在患者人數眾多且醫務人員有限的情況下。因此，本研究旨在通過提出一種可以同時測量幾個人的生命體徵，尤其是心跳率和呼吸率的設備，從而為這個問題提出一個初步的解決方案，而無需將感測器連接到他們的皮膚上。這是使用工作在77-81 GHz的FMCW（調頻連續波）雷達完成的。FMCW 雷達向多個目標的胸部發射電磁波並擷取反射波。然後，對這些反射波進行信號處理，就可以得到每個目標的心跳頻率和呼吸頻率，我們的實驗成功地對四個目標進行了同時檢測。實驗結果是每分鐘心跳頻率為52至82次，四個目標的呼吸頻率為每分鐘10至35次。這些結果符合正常的心跳頻率和正常的呼吸頻率；因此，我們的研究成功地提出了該問題的初步解決方案。

Microwaves are electromagnetic waves with wavelengths ranging between one millimeter and one meter or if expressed in terms of frequencies ranging between 300 MHz and 300 GHz. There are many applications that use the microwave. In order to achieve the desired characteristics of microwave applications, it is necessary to include a common-mode noise filter (CMF) to reduce interference from common-mode (CM) noise. One example of an application that uses a microwave is radar. There are many applications that use radar, including applications to measure human vital signs.
In the first part of this dissertation, after the Introduction, we consider a Single Band Common Mode Noise Filter. A Single-band Series Absorptive Common Mode Filter (ACMF) is proposed. The ACMF is embedded in a four-layer printed circuit board (PCB). The ACMF consists of three parts: a Reflective Common Mode Filter (RCMF), a matching circuit, and an absorber. The RCMF is designed using mushroom type. The matching circuits are designed using meander lines to reduce the size of the filter dimensions. The absorber is a series resistor. The designed operating frequency is 2.45 GHz. From the simulation, the results of measurements are as follows: Scc21 is -22.49 dB in the frequency of 2.61 GHz, Scc11 is -18.62 dB in the frequency of 2.5 GHz, the Differential Mode (DM) signals integrity can be maintained with a very small Sdd21 of -1 dB in the frequency range of 0 - 8 GHz, and the achieved Absorption Efficiency (AE) is 93 % in the frequency of 2.54 GHz. The proposed ACMF dimension is 10.3 mm x 4.6 mm. The fractional bandwidth is 19 %. The measurement results of the fabrication are not much different from the simulation results, they are as follows: Scc21 is -17.87 dB in the frequency of 2.31 GHz, Scc11 is -20.87 dB in the frequency of 2.38 GHz, Sdd21 is -2.8 dB in the frequency range of 0 – 8 GHz, the Absorption Efficiency is 97 % in the frequency of 2.32 GHz, and the fractional bandwidth is 17 %. This means that the designed simulation can be implemented with results that are close to the design calculations.
In the second part of this dissertation, we consider a Dual Band Common Mode Noise Filter. A common-mode noise filter with a wideband suppressing and dual-band high absorbing common mode filter, which is called absorptive common-mode filter (ACMF), is explained. The filter is constructed by a reflective-type common-mode filter (RCMF), a phase matching, and an absorber. It is composed of three layers with dimensions of 14.98 mm × 9.585 mm. The broadband common-mode noise suppression can be achieved by positioning multiple transmission zeros. By using dual-band phase matching and an absorber, the dual-band absorption can be realized. The frequencies are in the range of 2.4 GHz to 2.5 GHz and 5.17 GHz to 5.33 GHz respectively. The positioning of transmission zeros and absorption points at those frequencies leads to a high absorption efficiency. The simulation result shows that the common-mode suppression, which is below -10 dB, is from 2 GHz to 11 GHz. The fractional bandwidth is 138 %. The differential-mode (DM) signal keeps integrity in the range from DC to 12 GHz. The absorption efficiencies in two frequency sections are 97 % and 96 % respectively. The experiment results show only slight differences from the simulation results.
In the third part of this dissertation, we discuss the Frequency Modulated Continuous Wave Radar. The measurement of heartbeat rate and breathing rate for patients with sensitive skin, such as skin with burns, is very difficult to do, especially if the number of patients is large and medical personnel is limited. Therefore, this study seeks to propose a preliminary solution to this problem by proposing a device that can measure the vital signs of several people concurrently, especially the heartbeat rate and breathing rate, without attaching sensors to their skin. This is done using an FMCW (frequency-modulated continuous wave) radar that operates at 77–81 GHz. FMCW radar emits electromagnetic waves towards the chest of several targets and picks up the reflected waves. Then, using signal processing of these reflected waves, each target’s heartbeat rate and breathing rate can be obtained. Our experiment succeeded in performing concurrent detection for four targets. The experimental results are between 52 and 82 beats per minute for the heartbeat rates and between 10 and 35 breaths per minute for the breathing rates of four targets. These results are in accordance with the normal heartbeat rate and normal breathing rate; thus, our research succeeded in proposing a preliminary solution to this problem.

[1] D. M. Pozar, Microwave Engineering, 4th ed.; John Wiley & Sons, Inc: Hoboken, New Jersey, USA, 2012; pp. 1.

[2] Z. Chen and G. Katopis, “A comparison of performance potentials of single ended vs. differential signaling,” in Electrical Performance of Electronic Packaging - 2004, pp. 185–188, 2004.

[3] D. G. Kam, H. Lee, J. Kim, and J. Kim, “A new twisted differential line structure on high-speed printed circuit boards to enhance immunity to crosstalk and external noise,” IEEE Microwave and Wireless Components Letters, vol. 13, no. 9, pp. 411– 413, 2003.

[4] E. Bogatin, Signal and Power Integrity, Simplified. Prentice Hall, 3rd ed., 2018.

[5] W. T. Liu, C. H. Tsai, T. W. Han, and T. L. Wu, “An Embedded Common-Mode Suppression Filter for GHz Differential Signals Using Periodic Defected Ground Plane,” IEEE Microwave and Wireless Components Letters, vol. 18, no. 4, pp. 248– 250, 2008.

[6] F. de Paulis, L. Raimondo, S. Connor, B. Archambeault, and A. Orlandi, “Compact Configuration for Common Mode Filter Design based on Planar Electromag- netic Bandgap Structures,” IEEE Transactions on Electromagnetic Compatibility, vol. 54, no. 3, pp. 646–654, 2012.

[7] S. J. Wu, C. H. Tsai, T. L. Wu, and T. Itoh, “A Novel Wideband Common-Mode Suppression Filter for Gigahertz Differential Signals Using Coupled Patterned Ground Structure,” IEEE Transactions on Microwave Theory and Techniques, vol. 57, no. 4, pp. 848–855, 2009.

[8] K. Yanagisawa, F. Zhang, T. Sato, K. Yamasawa, and Y. Miura, “A new wideband common-mode noise filter consisting of Mn-Zn ferrite core and copper/polyimide tape wound coil,” IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3571–3573, 2005.

[9] B. F. Su and T. G. Ma, “Miniaturized Common-Mode Filter Using Coupled Synthesized Lines and Mushroom Resonators for High-Speed Differential Signals,” IEEE Microwave and Wireless Components Letters, vol. 25, no. 2, pp. 112–114, 2015.

[10] T. Adiprabowo, D. B. Lin, Y. H. Zheng, Y. H. Chen, C. Y. Zhuang, and B. H. Tsai, “Dual-Band High Absorbing and Broadband Suppressing Common-Mode Noise Filter,” IEEE Transactions on Electromagnetic Compatibility, pp. 1–10, 2021.

[11] “IEEE Standard for Information Technology — Telecommunications and information exchange between systems Local and metropolitan area networks—Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications,” IEEE Std 802.11-2016 (Revision of IEEE Std 802.11-2012), pp. 1–3534, 2016.

[12] C. H. Wu, C. H. Wang, and C. H. Chen, “Novel Balanced Coupled-Line Bandpass Filters With Common-Mode Noise Suppression,” IEEE Transactions on Microwave Theory and Techniques, vol. 55, no. 2, pp. 287–295, 2007.

[13] C. H. Tsai and T. L. Wu, “A Broadband and Miniaturized Common-Mode Filter for Gigahertz Differential Signals Based on Negative-Permittivity Metamaterials,” IEEE Transactions on Microwave Theory and Techniques, vol. 58, no. 1, pp. 195– 202, 2010.

[14] X. H. Wu and Q. X. Chu, “Compact Differential Ultra-Wideband Bandpass Filter With Common-Mode Suppression,” IEEE Microwave and Wireless Components Letters, vol. 22, no. 9, pp. 456–458, 2012.

[15] P. J. Li, Y. C. Tseng, C. H. Cheng, and T. L. Wu, “A Novel Absorptive Common- Mode Filter for Cable Radiation Reduction,” IEEE Transactions on Components, Packaging and Manufacturing Technology, vol. 7, no. 4, pp. 511–518, 2017.

[16] Z. Chen, and G. Katopis, “A comparison of performance potentials of single ended vs. differential signaling,” in Proc. 13th, Electrical Performance of Electronic Packaging Conference, 2004, pp.185-188.

[17] D. G. Kam, H. Lee, J. Kim, and J. Kim, “A new twisted differential line structure on high-speed printed circuit boards to enhance immunity to crosstalk and external noise,” IEEE Microwave and Wireless Components Letters, vol 13, pp. 411-413, Sept. 2003.

[18] E. Bogatin, Signal Integrity – Simplified, N.J.: Prentice Hall, 2004.

[19] “Differential (Normal) Mode Noise and Common Mode Noise－Causes and Measures,” Tech Web, March. 08, 2018. [Online]. Available: https://techweb.rohm.com/knowledge/emc/s-emc/01-s-emc/6899.

[20] W. T. Liu, C. H. Tsai, T. W. Han, and T. L. Wu, “An embedded common-mode suppression filter for G-Hz differential signals using periodic defected ground plane,” IEEE Microwave and Wireless Components Letters, vol. 18, no. 4, April 2008.

[21] F. Paulis, L. Raimondo, S. Connor, B. Archambeault, and A. Orlandi,” Compact configuration for common mode filter design based on planar electromagnetic bandgap structures,” IEEE Transactions on Electromagnetic Compatibility, vol. 54, no. 3, June 2012.

[22] S. J. Wu, C. H. Tsai, and T. L. Wu, “A novel wideband common-mode suppression filter for GHz differential signals using coupled patterned ground structure,” IEEE Transaction on Microwave Theory and Techniques, vol. 57, no. 4, pp.848–855, Apr. 2009.

[23] K. Yanagisawa, F. Zhang, T. Sato, K. Yamasawa, and Y. Miura, “A new wideband common-mode noise filter consisting of Mn-Zn ferrite core and copper/polyimide tape wound coil,” IEEE Transactions on Magnetics, vol. 41, no. 10, pp. 3571–3573, Oct. 2005.

[24] B. F. Su and T. G. Ma, “Miniaturized common-mode filter using coupled synthesized lines and mushroom resonators for high-speed differential signals,” IEEE Microwave and Wireless Component Letters, vol. 25, no. 2, pp. 112–114, Feb. 2015.

[25] P. J. Li, Y. C. Tseng, C. H. Cheng, and T. L. Wu, “A Novel Absorptive Common-Mode Filter for Cable Radiation Reduction,” IEEE Transactions on Component, Packaging and Manufacturing Technology, vol. 7, no 4, April 2017.

[26] P. J. Li and T. L. Wu, “Synthesized Method of Dual-Band Common-Mode Noise Absorption Circuits,” IEEE Transactions on Microwave Theory and Techniques, vol. 67, no 4, April 2019.

[27] C. Y. Hsiao, C. H. Tsai, C. N. Chiu, and T. L. Wu, “Radiation suppression for cable-attached packages utilizing a compact embedded common-mode filter,” IEEE Trans. on Components, Packaging and Manufacturing Technology, vol. 2, no. 10, pp. 1696–1703, Oct. 2012.

[28] G. H. Shiue, C. M. Hsu, C. L. Yeh, and C. F. Hsu ,“A Comprehensive Investigation of a Common-Mode Filter for Gigahertz Differential Signals Using Quarter-Wavelength Resonators,” IEEE Trans. on Components, Packaging and Manufacturing Technology, vol. 4, no. 1, January. 2014.

[29] J. Naqui, A. F. Prieto, M. D. Sindreu, F. Mesa, J. Martel, F. Medina, and F. Martin, “Common-mode suppression in microstrip differential lines by means of complementary split ring resonators: theory and applications,” IEEE Transactions on Microwave Theory and Techniques, vol. 60, no.10, October 2012.

[30] C. H. Hung, C. Y. Hsiao, and T. L. Wu, “A novel common-mode filter (CMF) design based on signal interference technique,” in 2014 IEEE Electrical Design of Advanced Packaging & Systems Symposium (EDAPS), Bangalore, India, December 14-16, 2014.

[31] T. W. Weng, C. H. Tsai, C. H. Chen, D. H. Han, and T. L. Wu, ”Synthesis Model and Design of a Common-Mode Bandstop Filter (CM-BSF) With an All-Pass Characteristic for High-Speed Differential Signals,” IEEE Trans. on Components, Packaging and Manufacturing Technology, vol. 62, no 8, August 2014.

[32] P. J. Li, C. H. Cheng, Y. C. Tseng, and T. L. Wu, “Novel Absorptive Design of Common-Mode Filter at Desired Frequency Band,” in 2016 IEEE 20th Workshop on Signal and Power Integrity (SPI), Turin, Italy, May 8-11, 2016.

[33] Z. Li, D. Pommerenke, and Y. Shimoshio, “Common-mode and Differential-mode Analysis of Common Mode Chokes”, in 2003 IEEE Symposium on Electromagnetic Compatibility, Boston, 2003, pp. 384-387.

[34] W. Lv, W. He, X. Lin, and J. Miao, Non-Contact Monitoring of Human Vital Signs Using FMCW Millimeter Wave Radar in the 120 GHz Band. Sensors 2021, 21, 2732.

[35] X. Yang, X. Zhang, Y. Ding, and L. Zhang, Indoor Activity and Vital Sign Monitoring for Moving People with Multiple Radar Data Fusion. Remote. Sens. 2021, 13, 3791

[36] G. Sacco, E. Piuzzi, E. Pitella, and S. Pisa, An FMCW Radar for Localization and Vital Signs Measurement for Different Chest Orientations. Sensors 2020, 20, 3489.

[37] Texas Instruments. Available online: http://www.ti.com/lit/ds/symlink/iwr1443.pdf (accessed on 12 October 2021).

[38] A. Ahmad, J. C. Roh, D. Wang, and A. Dubey, Vital Signs Monitoring of Multiple People using a FMCW Millimeter-Wave Sensor. In Proceedings of 2018 IEEE Radar Conference, Oklahoma City, OK, USA, 23–27 April 2018; IEEE: Piscataway, New Jersey, USA, 2018. https://doi.org/10.1109/RADAR.2018.8378778.

[39] M. Alizadeh, G. Shaker, J. C. M. D. Almeida, P. P. Morita, and S. S. Naeini, Remote Monitoring of Human Vital Signs Using mm-Wave FMCW Radar. IEEE Access 2019, 7, 54958–54968. https://doi.org/10.1109/ACCESS.2019.2912956.

[40] Y. Yuan, C. Lu, A. Y. K. Chen, C. H. Tseng, and C. T. M. Wu, Noncontact Multi-Target Vital Sign Detection using Self-Injection-Locked Radar Sensor based on Metamaterial Leaky Wave Antenna. In Proceedings of 2019 IEEE MTT-S International Microwave Symposium, Boston, MA, USA, 2–7 June 2019; IEEE: 2019. https://doi.org/10.1109/MWSYM.2019.8700861.

[41] L. Liu, and S. Liu, Remote Detection of Human Vital Sign with Stepped-Frequency Continuous Wave Radar. IEEE JSTARS 2014, 7, 775–782. https://doi.org/10.1109/JSTARS.2014.2306995.

[42] Medscape. Available online: https://emedicine.medscape.com/article/2172054-overview#a3 (accessed on 12 October 2021).

[43] UpBeat. Available online: https://upbeat.org/early-warning-signs/slow-heartbeat (accessed on 12 October 2021).

[44] A. D. Droitcour, Non-Contact Measurement of Heart and Respiration Rates with Single-Chip Microwave Doppler Radar. Ph.D. Thesis, Stanford University, Stanford, CA, USA, June 2006.

[45] G. M. Brooker, Understanding Millimetre Wave FMCW Radars. In Proceedings of 1st International Conference on Sensing Technology, Palmerston North, New Zealand, 21–23 November 2005.

[46] L. Su, H. S. Wu, and C. K. C. Tzuang, 2-D FFT and time-frequency analysis techniques for multi-target recognition of FMCW radar signal. In Proceedings of Asia-Pacific Microwave Conference 2011, Melbourne, Australia, 5–8 December 2011; IEEE: 2011.

[47] Introduction to Mmwave Sensing: FMCW Radars. Available online: https://training.ti.com/sites/default/files/docs/mmwaveSensing-FMCW-offlineviewing_0.pdf (accessed on 12 October 2021).

[48] Q. Lv, L. Chen, K. An, J. Wang, H. Li, D. Ye, J. Huangfu, C. Li, and L. Ran, Doppler Vital Signs Detection in the Presence of Large-Scale Random Body Movements. IEEE TMTT 2018, 66, 4261–4270. https://doi.org/10.1109/TMTT.2018.2852625.

[49] J. Tu, T. Hwang, and J. Lin, Respiration Rate Measurement Under 1-D Body Motion Using Single Continuous-Wave Doppler Radar Vital Sign Detection System. IEEE TMTT 2016, 64, 1937–1946. https://doi.org/10.1109/TMTT.2016.2560159.

[50] W. F. Chang, K. W. Chen, and C. L. Yang, Noise Tolerable Vital Sign Detection Using Phase Accumulated Demodulation for FMCW Radar System. In Proceedings of 2018 IEEE International Microwave Biomedical Conference, Philadelphia, PA, USA, 14–15 June 2018; IEEE: 2018. https://doi.org/10.1109/IMBIOC.2018.8428908.

[51] Q. Guoqing, High accuracy range estimation of FMCW level radar based on the phase of the zero-padded FFT. In Proceedings 7th International Conference on Signal Processing, Beijing, China, 31 August–4 September 2004; IEEE: 2004. https://doi.org/10.1109/ICOSP.2004.1442185.

[52] Driver Vital Signs—Developer’s Guide; Texas Instruments: Dallas, Texas, USA, 2017; pp. 1–30.

[53] S. Wang, A. Pohl, T. Jaeschke, M. Czaplik, M. Kony, S. Leonhardt, and N. Pohl, A Novel Ultra-Wideband 80 GHz FMCW Radar System for Contactless Monitoring of Vital Signs. In Proceedings of 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, Milan, Italy, 25–29 August 2015; IEEE: 2015. https://doi.org/10.1109/EMBC.2015.7319509.

[54] J. Svensson, High Resolution Frequency Estimation in an FMCW Radar Application. Master’s Thesis, Linköping University, Linköping, Sweden, May 2018.

[55] Cython. Available online: https://cython.readthedocs.io/en/latest/src/tutorial/cython_tutorial.html (accessed on 12 October 2021).

[56] Python. Available online: https://docs.python.org/3/extending/building.html (accessed on 12 October 2021).

[57] Tutorialspoint. Available online: https://www.tutorialspoint.com/pyqt/index.htm (accessed on 12 October 2021).

[58] Computer Hope. Available online: https://www.computerhope.com/jargon/g/gui.htm (accessed on 12 October 2021).

[59] C95.1 Edition-1999—IEEE Standard for Safety Levels with Respect to Human Exposure to Radio Frequency Electromagnetic Fields, 3 kHz to 300 GHz. Available online: https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=757105 (accessed on 12 October 2021). https://doi.org/10.1109/IEEESTD.1999.89423.

[60] R. C. Johnson, Antenna Engineering Handbook, 3rd ed.; McGraw-Hill, Inc: Atlanta, Georgia, USA, 1993; pp. 1.4–1.5.

[61] Texas Instruments IWR1443BOOST User Manual. Available online: https://www.manualslib.com/manual/1976384/Texas-Instruments-Iwr1443boost.html (accessed on 14 December 2021).

[62] Using a Complex-Baseband Architecture in FMCW Radar Systems. Available online: https://www.ti.com/lit/pdf/spyy007 (accessed on 12 October 2021).

[63] S. Machado, and S. Mancheno, Automotive FMCW Radar Development and Verification Methods. Master’s thesis, Chalmers University of Technology, University of Gothenburg, Gothenburg, Sweden, 2018.

[64] A. T. Purnomo, D. B. Lin, T. Adiprabowo, and W. F. Hendria, Non-Contact Monitoring and Classification of Breathing Pattern for the Supervision of People Infected by COVID-19. Sensors 2021, 21, 3172.

[65] S. K. Tseng, C. N. Chiu, Y. C. Tsao, and Y. P. Chiou, “ A Novel Ultrawideband Absorptive Common-Mode Filter Design Using a Miniaturized and Resistive Defected Ground Structure,” IEEE Transactions on Electromagnetic Compatibility, vol. 63, no 1, February 2021.

[66] P. J. Li, C. H. Cheng, and T. L. Wu, “ A Resistor-Free Absorptive Common-Mode Filter Using Gap-Coupled Resonator,” IEEE Microwave and Wireless Component Letters, vol. 28, no 10, October 2018.