Thi Lan TranQuoc Thuc NguyenThi Xuan DangThi Thu Thuy PhamVan Lam PhiRohani Bakar2026-10-122026-10-12202510.1109/ATC67618.2025.11268594https://dspace-cris.utar.edu.my/handle/123456789/11699This study proposes a compact dual-band printed inverted-F Antenna (PIFA) tailored for integration into miniaturized Internet of Things (IoT) devices. The antenna operates at 2.4 GHz and 5.5 GHz frequency bands, employing a structurally simple yet effective design strategy that introduces an additional resonant branch to achieve dual-frequency operation. A key design constraint assumes a smart-card-sized (53.98 × 85.6 mm2) IoT device, with the antenna confined to one-eighth of the total available area. Despite this spatial limitation, the antenna demonstrates notable performance, achieving realized gains of 2.48 dBi and 3.6 dBi at 2.4 GHz and 5.5 GHz, respectively, along with radiation efficiency exceeding 80% across the targeted bands. Owing to its compact, single-layer structure and efficient radiation characteristics, the proposed design presents a promising solution for space-constrained wireless applications in next-generation IoT systems. © 2025 IEEE.en-USCompact designDual-band antennaIoTPrinted Inverted-F AntennaSmart-card integrationDirectional patterns (antenna)Internet of thingsMicrowave antennasMobile antennasSmart cardsCards integrationCompact designsDesign strategiesDual BandDual band antennasDual frequency operationGHz frequenciesPrinted inverted-F antennaSimple++Microstrip antennastext::conference output::conference proceedings::conference paper