Dual-band broadside radiation antenna via near-field electric and magnetic couplings of nested metamaterial resonators

摘要

In this paper, we propose a method of designing broadside radiation antennas using metamaterial resonators. The antenna consists of a feeding probe and a nested metamaterial resonator (MR), where the latter is located in the near-field zone of the former and both of them stand on the metallic ground. The nested MR, where a finite-length comb structure (CS) is circled by a broadside-coupled split-ring resonator (BC-SRR), is used as the radiator. Excited by the tilted electric fields around the feeding probe, even-mode spoof surface plasmon polaritons (SSPPs) can be excited on the comb structure, forming standing wave, and leading to broadside radiation at the half-wavelength frequency. The BC-SRR is excited by the magnetic fields penetrating through it, leading to broadside radiation at its resonant frequency. A prototype working at 5.4 GHz and 7.0 GHz was designed, fabricated and measured. The measured and simulated results agree well and verify our design.