由於5G的興起，越來越多人占用低頻的信號，導致干擾增加，因此越來越多研究開始轉往高頻信號，本論文所選擇的頻段即為24 GHz，已減少信號在傳送過程中環境的干擾。另外在高頻的應用上，若沒有較高的增益，傳送端TX之信號較難以將信號發送到指定位置，透過陣列天線能比一般天線有較高的增益，同時也會具有高指向性的特性，以增加信號偵測的完整性，所以本篇論文所選用的天線為陣列天線。
另外在系統設計方面，分成兩大部分，第一部分是以微控制器（MCU, Micro Control Unit）做為數位控制板，提供發射端訊號和接收所發射出去的信號，另一部分則是程式設計，做為類比信號接收及發射控制之用途，透過數位控制板控制類比射頻收發板，經由天線將發送信號打出，碰到目標偵測物時，將電磁波反射由天線RX端接收，傳送至類比積體電路，再將收進來的資料轉為數位訊號傳送至微控制器（MCU,Micro Control Unit）並回傳電腦，以做為信號分析，並利用頻率調變連續波雷達(FMCW radar, Frequency modulated continuous waveform radar)之原理，觀察發送信號及接收信號之時間差距，來判斷目標偵測物的所在位置，並透過圖形使用者介面(GUI, Graphical User Interface)，將結果顯示出來。

Because of 5G more popular, lots of frequency are already use for some communication system, so more and more people change to use high frequency signal. For this paper we selected frequency band is 24 GHz, for reduced interference in the signal transmission process environment. About the application of high frequency, if there is no higher gain then the transmitter TX signal is more difficult to send the signal to the specified location, through the array antenna can get highest gain then the others and also with high directional characteristics to increase the integrity of signal detection, so the design of this paper use array antenna as antenna design.

In addition, in the system design, divided into two parts, the first part is the MCU as a digital control panel, to provide the transmitter signal and receive the signal sent out, the other part is programming as Analogue signal reception and transmission purposes, through the digital control panel control analog radio frequency transceiver board, through the antenna will send the signal to hit, hit the target detection object, the electromagnetic wave reflected by the antenna RX receiver, sent to the analog IC, The incoming data is transferred to the MCU for signal analysis and the FMCW radar is used to observe the time difference between the transmitted signal and the received signal, then show on GUI.

[1] M.Klotz, H. Rohling, “24GHz radar sensors for automotive applications,” Microwaves, Radar, and Wireless Communications.2000. MIKON-2000.13th International Conference on, Volune:1, pp.359-362,2000.
[2] Inomata, K., Noda, S., Okazaki, K., Watanabe, K., Fukae, T., and Matsuoka, K., “24 GHz side-looking radar for vehicular applications,” Signals, Systems and Computers, 2000. Conference Record of the 34th Asilomar Conference on, Volume:2, pp. 1131-1134, 2000.
[3] 黃泓偉，24 GHz 頻率調變連續波雷達系統之前端電路設計與整合，國立交
[4] Yeo H, Ryu S, Lee Y, et al. A 940 MHz-bandwidth 28.8 μs-period 8.9 GHz chirp frequency synthesizer PLL in 65 nm CMOS for X band FMCW radar applications. IEEE International Solid-State Circuits Conference (ISSCC) Digital Technical Papers; 2016. p. 238–239.
[5] TI “Digital Signal Controllers (DSCs)” June 2007–Revised August 2012
[6] C. A. Balanis, Antenna Theory: Analysis and Design, 3nd Ed., John Wiley & Sons Inc, New York, 2005.
[7] C. M. Butler, "Analysis of a coax-fed circular microstrip antenna", Proc. Workshop Printed Circuit Antenna Tech., pp. 13/1-17, 1979-Oct.
[8] Watkins J, “Circular resonant structures in microstrip,” Electronics Letters., Vol. 5, NO. 21, pp. 524-525, Oct. 1969.
[9] Chen, S. Otto, "A taper optimization for pattern synthesis of microstrip series-fed patch array antennas", Proc. of IEEE EuWIT Conf., 2009, pp 160-163.
[10] C. Wang, R. Qian, M.-H. Yang, Y. Sun, J.-Z. Gu, and X.-W Sun, "A low cost 24-GHz FMCW radar for automobile application," in Proc. IEEE Eur. Microw. Coni, Oct. 2005, vol. 3, pp. 4-6.
[11] M. Milijić, A. Nešić, B. Milovanović, "Side Lobe Suppression of Printed Antenna Array with Perpendicular Reflector", in Proc. 7th Int. Conf. Telecommun. Modern Satellite, Cable and Broadcasting Services, pp. 517–520, Nis, Serbia, Oct. 16–19, 2013.
[12] Yuan S.; Schumacher H.: 56 GHz Bandwidth FMCW Radar Sensor with On-Chip Antennas in SiGe BiCMOS. IEEE MTT-S Int. Microwave Symp. Digest (IMS), Tampa, USA, 2014.
[13] W. J. Wilson, S. H. Yueh, S. J. Dinardo, S. L. Chazanoff, A.Kitiyakara, F. K. Li, Y. Rahmat-Sarnii, "Passive Active Land 5 Band (PALS) Microwave Sensor for Ocean Salinity and Soil Moisture Measurements," IEEE Transactions on Geoscience and Remote Sensing, 39, 5, May 2001, pp. 1039- 1048.
[14] M. Slović, B. Jokanović, B. Kolundzija, "High Efficiency Patch Antenna for 24 GHz Anticollision Radar", in Proc. 7th Int. Conf. Telecommun. Modern Satellite, Cable and Broadcasting Services, pp. 20–23, Nis, Serbia, Sept. pp. 28–30, 2005.