Abstract
This work presents the design and experimental validation of a multilayer antenna for signal transmission and reception applications in the 2 to 20 GHz range, with a special focus on FM communication. We developed the design in Ansys HFSS using an eight-layer structure (copper, FR4, copper, air, FR4, air, copper, and FR4) optimized for stable performance across the proposed bandwidth. We fabricated and evaluated the prototype in a semi-anechoic chamber, where it served as the receiving antenna against a double-crested pyramidal horn antenna as the transmitting antenna. We measured radiation patterns at 2.6, 4.7, and 8.7 GHz, with recorded powers ranging from -60 to -82 dB, over a sweep angle of 0° to 180° in 10° steps, at a test distance of 2.5 meters. Additionally, we implemented a test system using a USRP and GNU Radio to transmit and receive FM signals within the same frequency range. The measurements yielded powers ranging from -18 to -74 dBm, from which we calculated the radiation patterns and verified proper system operation. The results confirm the antenna’s performance under real-world conditions and its viability for spread-spectrum wireless communication applications.