A novel dielectric resonator antenna with very high dielectric constant

In this paper a novel dielectric resonator antenna (DRA) is presented which uses a commercially available block of dielectric of size 52×52×10 mm³. The dielectric constant ε_r of the dielectric is 194 with a loss tangent of 0.00077. The DRA works in two configurations; in the first configuration, it is placed over a 1×1 m² metal ground plane whereas in the second configuration, a square patch artificial magnetic conductor (AMC) of size 0.3×0.3 m² and thickness 1.28 mm loaded with lumped capacitors and acting as a high impedance surface is inserted between the DRA and the large metal ground plane. In both cases, the DRA is fed with a probe of length 11.5 mm. In both configurations, the antenna resonates in the FM range (88-108 MHz) at 96.5 MHz and it is found through simulations that putting the DRA over the AMC increases the gain by upto 1.5 dBi.