An approach for small omnidirectional microstrip antennas based on the backward waves of double negative metamaterials

作者：Wu M F^*; Meng F Y; Wu Q; Wu J; Lee C

来源：Applied Physics A-Materials Science & Processing, 2007, 87(2): 193-198.

DOI：10.1007/s00339-006-3818-3

In this paper, a small omnidirectional microstrip antenna (MSA) is proposed based on a compact double negative (DNG) metamaterial, which is constructed by modified split ring resonators (MSRRs) and metal strips. First, the backward wave property of the DNG slab is investigated and illustrated by full-wave simulations. It is shown that the slab can exhibit double negative parameters and support backward wave in a broadband of 8.45 GHz similar to 11.05 GHz, so the existence of the DNG band is proven. Then the DNG unit cells are stacked and embedded into a host substrate to construct a phase-compensating substrate for the small MSA. By using the modified transmission line model (MTLM) and 3D full-wave simulation, a small MSA is modeled and characterized. Results show that the presence of the DNG fillings can indeed greatly reduce the physical dimensions from 0.5 lambda to 0.17 lambda, while its farfield pattern is significantly different from that of a conventional half-wave-length MSA. Lastly, the E-field distributions of the small MSA and a conventional half-wave-length MSA are contrasted and discussed to explain the functional mechanism of the small omnidirectional SMA.

• 出版日期2007-5
• 单位哈尔滨工业大学