Synthesis and Characterization of the Microwave Dielectric Properties of a (1-x) Li<sub>3</sub>MgNbO<sub>5</sub>–(x) Sr<sub>3</sub>V<sub>2</sub>O<sub>8</sub> Composite for Antenna Applicatio

This study investigates the fabrication of a cylindrical dielectric resonator antenna (CDRA) using ceramic microwave dielectric composites as a resonator. The composites (1-x) Li 3 MgNbO 5 -(x) Sr 3 V 2 O 8 (x=0.25-0.40) have been synthesized via the conventional solid-state reaction method, incorporating 1% B 2 O 3 to lower the sintering temperature. The 0.70-0.30 composite exhibited optimal microwave dielectric properties with a dielectric constant ( ε r ) of 19.20, a quality factor ( Q x f ) of 3738 GHz, and a temperature coefficient ( τ f )of -43 ppm/°C. These characteristics render the 0.70-0.30 composite suitable for CDRA applications. The experimentally obtained microwave dielectric parameters were used to simulate the CDRA design using the High-Frequency Structure Simulator design software. A single-feed cylindrical antenna has been fabricated using this composite material as a resonator with a radius × height of 5×6 mm 2 , mounted on an FR4 substrate measuring close to 25×25×1.6 mm 3 and Cu strip as a feed line. The simulated and experimentally measured parameters, including S11, voltage standing wave ratio, and radiation pattern, demonstrated excellent agreement, validating the composite's efficacy for antenna design.