Bandwidth Enhancement of Microstrip Patch Antenna Using Jerusalem Cross-Shaped Frequency Selective Surfaces by Invasive Weed Optimization Approach
Bandwidth Enhancement of Microstrip Patch Antenna Using Jerusalem Cross-Shaped Frequency Selective Surfaces by Invasive Weed Optimization Approach
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DOI：
10.2528/pier11051305
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发表时间：
2011
影响因子：
6.7
通讯作者：
Fatemeh M. Monavar;N. Komjani
中科院分区：
文献类型：
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作者：
Fatemeh M. Monavar;N. Komjani
本文提出了一种利用耶路撒冷十字形频率选择面（jc - fss）作为人造磁地平面来提高微带贴片天线带宽的新方法。采用入侵杂草优化（IWO）算法推导出贴片天线和JC-FSS元件的最优尺寸，使整个结构在考虑增益的情况下工作在5.8GHz。对于最先进的设计，天线和FSS地平面一起优化，而不是作为单独的组件。仿真结果表明，这种最佳配置（微带贴片天线在人造磁地平面上）的带宽约为10.44%。当整个结构的厚度被限制在0.1时，获得了这个宽的带宽。此外，还成功地实现了该结构更理想的辐射特性。在整个带宽范围内，AMC天线组合的辐射电子效率大于85%。总的来说，通过引入这种新型的耶路撒冷交叉人工磁导体（JC-AMC）来代替传统的完美电导体（PEC）接平面，带宽提高了67%左右，而且设计更薄、重量更轻。制作了天线样品和EBG层，并进行了测试，验证了设计的正确性。结果表明，采用FSS接地面的贴片天线的仿真结果与实测结果基本一致。
In this paper, we present a novel approach for improving the bandwidth of a microstrip patch antenna using Jerusalem cross- shaped frequency selective surfaces (JC-FSSs) as an artiflcial magnetic ground plane. The invasive weed optimization (IWO) algorithm is employed to derive optimal dimensions of the patch antenna and JC-FSS element in order for the whole structure to work at 5.8GHz with consideration of gain. For the most e-cient design, the antenna and FSS ground plane are optimized together, rather than as separate components. Simulation results demonstrate that this optimum conflguration (the microstrip patch antenna over the artiflcial magnetic ground plane) have a broad bandwidth of about 10.44%. This wide bandwidth is obtained while the thickness of the whole structure is limited to 0.1‚. Further more desirable radiation characteristics have been successfully realized for this structure. The radiation e-ciency of the AMC antenna conflguration was found to be greater than 85% over the entire bandwidth. In general by introducing this novel Jerusalem cross artiflcial magnetic conductor (JC-AMC) in lieu of the conventional perfect electric conductor (PEC) ground plane, the bandwidth enhancement of about 67% and a thinner and lighter weight design has been obtained. Sample antenna and EBG layer are also fabricated and tested, to verify the designs. It is shown that the simulation data in general agree with the measurement results for the patch antennas implemented with FSS ground plane.