เกื้อทวีกุ เทพ. “Bandwidth Enhancement Techniques of Slot Antenna CPW-Fed for Wireless Communication Systems”. Frontiers in Engineering Innovation Research 1 (June 30, 2015): 43–54. accessed February 18, 2025. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242055.