Inverted-F Antenna Radiation Efficiency Enhancement based on a Slotted Ground

This paper presents a compact and highly-efficient inverted-F antenna (IFA) suitable for Internet of Things (IoT) applications. A slotted ground is applied to significantly improve the antenna radiation efficiency. Compared to a conventional IFA on a solid ground plane, the proposed structure enhances radiation efficiency approximately 100%, from 14% to 27%, at 750 MHz. Simulated and measured results are in an excellent agreement, fully validating the IFA response.