A Novel Miniature Microstrip Patch Antenna for UWB Applications

Abstract

Microstrip antennas have become integral to modern communication systems, supporting applications such as radar, satellite navigation, telemetry, RFIDs, and transponder tracking. Their popularity stems from features like compact size, ease of fabrication, and planar configuration. However, traditional microstrip antennas are often constrained by narrow bandwidth and limited gain, which restrict their performance in high-demand wireless systems. This research presents an innovative miniaturized microstrip antenna design including a square patch and a defective ground structure (DGS) to overcome these restrictions. The suggested antenna is constructed and simulated with the High-Frequency Structure Simulator (HFSS) at a central frequency of 4 GHz. The concept employs a FR-4 substrate—a economical, readily accessible material—with an average thickness of 1.6 mm. The antenna structure includes a primary rectangular patch of dimensions 20 × 7 mm² and a dual-ground configuration: a conventional ground plane on the back side with dimensions of 26.2 × 6.25 mm² and two defected ground sections of 10.6 × 8 mm² located on either side of the patch plane. Simulation results confirm that the antenna achieves a return loss below -10 dB and a wide bandwidth of approximately 11 GHz, effectively covering the range required for Ultra-Wideband (UWB) applications. The incorporation of the DGS not only enhances bandwidth but also contributes to improved radiation characteristics and gain. These performance benefits position the proposed design as a strong candidate for next-generation compact and high-efficiency wireless communication systems.