Dielectric Embedded ESPAR (DE-ESPAR) Antenna Array for Wireless Communications

Abstract

A novel dielectric embedded electronically steerable passive array radiator (ESPAR) (DE-ESPAR) antenna array for mobile wireless communication terminal is developed by finite element method based numerical modeling technique. The size reduction of the seven-element monopole antenna was accomplished by embedding the array in a cylindrical rod of FIK ceramic complex with a relative permittivity around$varepsilon _r =4.5$. Dielectric embedded prototypes of a seven-element ESPAR antenna array were modeled and experimentally characterized. Experimental and numerical results are in good agreement. The optimized antenna produced a horizontal directivity of 5.1 dBi and return loss of$19~ dB$at 2.48 GHz. An overall volume reduction of 80% and footprint reduction of 50% were achieved.