A Miniaturized Dual-Band Stacked Structure Antenna Design

Abstract

This letter describes the construction of a dual circularly polarized satellite navigation microstrip antenna that operates in the B2b and L bands of BDS. The unit is a double-fed double-layer laminated structure, with miniaturization achieved through high dielectric constant and thick dielectric thickness; the isolation between the ports is improved by fitting a ring of metal holes surrounding the probes leading to the top patch; impedance matching is accomplished through the inclusion of a C-shaped slot loaded in the top patch. The simulation results show the isolation between the ports is ${S_{21}\,<\, - 26dB}$ (1.196~1.217GHz) and ${S_{21}\,<\, - 20.2dB}$ (1.611~1.627GHz); At 1.207 and 1.62GHz, RHCP gain of 5.12 dB and LHCP gain of 5.92 dB are also observed.