Design and Simulation on a New Dual-Polarized Antenna Fed by SICL

A novel scheme of dual-polarized antenna fed by the substrate integrated coaxial line (SICL) was proposed. The design can enlarge the impedance band of the dual-polarized antenna and realize the direct assembling of two orthogonal printed circuits. A SICL feeding structure based on multiple layer substrates was designed. For this SICL feeder, a wide band Balun from SICL to non-coplanar was introduced, which realized the transforming of un-balanced SICL port to balanced non-coplanar strip line. A wide band tapered impedance matching circuit from SICL to microstrip line was designed. Within the frequency range of 2.2 GHz to 2.8 GHz, the simulated isolation degree between two polarization ports is higher than 20 dB, the wide angle coverage pattern at each port is achieved, the cross polarization level at the boresight is lower than -20 dB, and the high radiation efficiency is realized. The measured result of the fabricated antenna is close to the simulation result, which verifies the feasibility of the scheme.