1.    Chatchai Chokchai, Kuakul Jantawas and Phuwanad Hadjamnung “Automatic Plastic Neck Filling Machine for Mushroom Bag using Pneumatic System with Internet of Thing” 10th ECTI-CARD-2018, Phitsanulok, Thailand, 26-29 July 2018.

2.    Chatchai Chokchai, Natdanai  Romjai, and Kittisak    Hansakchai “Low Cost RFID System Based on Internet of Thing for Mini Marathon” 10th ECTI-CARD-2018, Phitsanulok, Thailand, 26-29 July 2018.

3.    Chatchai Chokchai, and Thanan Rueankhong “Semi-Automatic Mushroom Bag Filling Machine for Smart Mushroom Farm” Proceedings of the 10^th NPRU National Academic Conference “Fostering the King's Philosophy in Research and Sustainability Regional Development”, 29 - 30 March 2018.

4.    Chatchai Chokchai, and Thanan Rueankhong “A Study of the Light-Emitting Diodes Responses to Transmit the Voice Signals for Visible Light Communication Systems” Proceedings of the 10th NPRU National Academic Conference “Fostering the King's Philosophy in Research and Sustainability Regional Development”, 29 - 30 March  2018.

5.    Chatchai  Chokchai, Nattapong  Duangrit, and Prayoot Akkaekthalin “Monopole Decagon Fractal Patch Resonator with Defected Ground Plane for WLAN MIMO Antenna,” International Symposium on Antennas and Propagation, Phuket, Thailand, 2017.

6.    Chatchai  Chokchai, Nattapong  Duangrit, and Prayoot Akkaekthalin “Monopole MIMO Antenna using Decagon Fractal Patch Resonator and Defected Ground Plane for WLAN application,” 5^th International Electrical Engineering Congress, Pattaya, Thailand, 8-10 March 2017.

7.    Nattapong  Duangrit,  Chatchai  Chokchai, and Prayoot Akkaekthalin “Monopole MIMO Antenna using Decagon Fractal Patch Resonator and Defected Ground Plane for WLAN Application,” Thailand-Japan MicroWave 2017 (TJMW2017), June. 2017.

8.    Chatchai  Chokchai, Nattapong  Duangrit, “Decagon Microstrip Antenna for 2.4 GHz and Wide Band Application,” ECTI-CARD 2016, July 2016.

9.    Chatchai Chokchai, Danudpong HoMdee, and Kwanchaya Kuerchim, “Multiple Input Multiple Output Antenna using Minkowski Fractal Patch with H-Shape Stub for WLAN Application,” Electrical Engineering Conference (EECON 38) Vol.2, pp. 541-544, Nov. 2015.

10.  Chatchai Chokchai, Watthanaphum rodruedi, and Kamron joywong, “Multiple Input

Multiple Output Antenna for WLAN Using Hybrid Fractal Patch and Defected Ground Plane,” ECTI-CARD 2015, July 2015.

11.  Chatchai Chokchai, Pisit Janpangngern, and Banpot Chaiyong, “Design of a

Miniature Dipole Tag Antenna by Koch Fractal Curve for UHF RFID Application,” ECTI-CARD 2015, July 2015.

12.  Pubet Sangmahamad, and Chatchai Chokchai, “Development of Optical Communication System using QPSK Modulation Technique,” ECTI-CARD 2015, July 2015.

13.  Chatchai Chokchai, Sarawuth Chaimool, and Prayoot Akkaekthalin, “Miniaturized

MIMO Antenna for WiFi USB Dongle using Modified Fractal Patch Monopole and Defected Ground Plane,” Thailand-Japan MicroWave 2014 (TJMW2014), Nov. 2014.

14.  Chatchai Chokchai, Sarawuth Chaimool, and Prayoot Akkaekthalin, “A small fractal

monopole antenna for WLAN USB Dongle,” in Proc. Electrical Engineering Conference (EECON 37), Vol.2, pp. 611-614, Nov. 2014.

15.  Prayoot Akkaraekthalin, Chatree Mahatthanajatuphat, Sarawuth Chaimool, Tanan

Hongnara, Norakamon Wongsin, and Chatchai Chokchai, “Design of Fractal Antennas at Wireless Communication Research Group, KMUTNB,” in Proc. Electrical Engineering Conference (EECON 37), Vol.2, pp. 567-570, Nov. 2014.

16.    Chatchai Chockchai, Sarawuth Chaimool, and Prayoot Akkaekthalin, “Miniaturized MIMO antenna for WiFi USB dongle using fractal loop and defected ground plane,”  in Proc.2013 Asia-Pacific Conference on Antennas and Propagation (APCAP-2013), pp. 75-76, Aug. 2013.

17.    Sarawuth Chaimool, Chatchai Chockchai, Tanan Hongnara, Tanaporn Pechrkool, and Prayoot Akkaekthalin, “MIMO antennas for UWB communications with notched bands,” in Proc.2013 Asia-Pacific Conference on Antennas and Propagation (APCAP-2013), pp. 77-78, Aug. 2013.

18.    Sarawuth Chaimool, Chatchai Chokchai, and Prayoot Akkaraekthalin, “Triple-band USB dongle antenna using fractal and shorted loops for WiFi and WiMAX applications,”  Microwave and Optical Technology Letters, Vol.55, No.4, pp. 863-866, April 2013.

19.   Chatchai Chokchai , Sarawuth Chaimool, and Prayoot Akkaraekthalin, “Miniaturized triple-band USB dongle antenna using loaded-fractal loop monopole with shorted loop and fractal loop resonator” in Proc. International Conference of Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON), 2012.

20. Sarawuth Chaimool, Chatchai Chokchai, and Prayoot Akkaraekthalin, “Multiband loaded fractal loop monopole antenna for USB dongle applications,” Electronics Letters. Vol. 48, No. 23, pp. 1446-1447, Nov. 2012.

21.   Sarawuth Chaimool, Tanan Hongnara, Chatchai Chokchai, and Pimsuree Uayporn “Performance of the current detectors in water,” in Proc. Engineering/Electronics, Computer, Telecommunications and Information Technology Conference on Application Research and Development (ECTI – CARD), Jun. 2012.

22.   Chatchai Chokchai, Sarawuth Chaimool, Prayoot Akkraekthalin, and Vech Vivek  “A dual-band small fractal loop antenna for wireless LAN 2.45/5.2 GHz applications,” in Proc. Electrical Engineering Conference (EE Conf 34), Vol. 2 pp. 681-684, Dec. 2011.

 23. Somchai Saleekaw  and Chatchai Chokchai, “A quadruple branch dual band monopole antenna for wireless LAN system application,” in Proc. Electrical Engineering Conference (EECON 33), Vol.2, pp. 1021-1024, Dec. 2010.

My current research is in antenna, microwave circuits, and electromagnetic engineering. A primary research thrust is antenna design. I use theory, simulations, and prototyping to validate research ideas. I am also interested in applied engineering mathematics to electromagnetic problems. Recently, I am developing wireless power transfer, MIMO antenna, RFID antenna, and visible light communication.

Research Topic of Interest: MIMO antenna, RFID antenna, IoT, LoRaWAN, millimeter wave, 5G Communication, precision agriculture, Phytomonitoring system, antenna for GPR