Research on dual-polarisation printed dipole antenna for spherical near-field measurements

Abstract

Here a dual-polarisation printed dipole antenna for spherical near-field measurements is proposed. The printed dipole employs double-layered structure to obtain low cross-polarisation and uses irregular patch to get wide bandwidth. Two such dipoles are cross arranged to form a dual-polarisation dipole antenna. Simulated results show that the bandwidth is over 72% when VSWR is less than 3, the cross-polarisation ratio is better than 30 dB, the port isolation between two dipoles is better than −26 dB, while good radiation performance is also obtained. All the results above prove that the crossed arrangement structure will not affect the performance of the printed dipole, and the strength of mutual coupling between probes can be neglected.

Keywords

• electromagnetic wave polarisation
• microstrip antennas
• antenna radiation patterns
• dipole antennas
• microwave measurement
• crossed arrangement structure
• dual-polarisation printed dipole antenna
• cross-polarisation ratio
• spherical near-field measurements
• double-layered structure
• irregular patch
• VSWR
• port isolation
• radiation performance
• mutual coupling strength