High performance planar sleeve dipole array antenna with directional radiation

Abstract

A planar sleeve dipole array antenna is analyzed and successfully implemented. The proposed antenna is designed for operating at 1800/1900MHz band of basic station applications. To achieve suffcient bandwidth for the requirement of the PCS 1800MHz band (1710-1880 MHz) and 1900MHz band (1880-1930 MHz) for DECT (Digital Enhanced Cordless Telecommunications), the proposed antenna comprises of a 1 × 5 coplanar back-to-back sleeve dipole elements, and the microstrip line to balanced transmission line feeding technique was adopted in this design. This structure is easily constructed by being printed on both sides of a dielectric (FR4) substrate. The measured - 10 dB S11 (VSWR 2: 1) impedance bandwidth is around 13.2% (1690-1930 MHz). A reflector is put behind the dipole array to obtain directional radiation and high gain, and the measured antenna gain for operating frequencies across the 1800/1900MHz band is about 7.2-9.1 dBi. The measured results of radiation effciency, radiation pattern, antenna gain and S11 show that the sleeve dipole array antenna has a good performance.