เกื้อทวีกุ เ. Bandwidth Enhancement Techniques of Slot Antenna CPW-Fed for Wireless Communication Systems. Front Eng Innov Res. [internet]. 2015 Jun. 30 [cited 2026 Sep. 3];1:43-54. available from: https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242055