Directivity enhancement of fabry-perot antenna by using a stepped-dielectric slab superstrate

作者：Li Yanfei^*; Mittra Raj; Zeng Binghao; Lu Guizhen; Li Zengrui; Liu Jianbo; Chen Cheng Wei; Chang Dau Chyrh

来源：Microwave and Optical Technology Letters, 2012, 54(3): 711-715.

DOI：10.1002/mop.26614

• microstrip patch antenna
• directivity enhancement
• Fabry-Perot resonator
• stepped dielectric superstrate

A Fabry-Perot resonator excited by a microstrip patch antenna that has a superstrate with a stepped dielectric constant is designed to operate at 5.8 GHz. The antenna is fabricated and is shown to provide enhanced directivity over that achievable using uniform dielectric slabs, with either epsilon(r) = 4.4 or epsilon(r) = 10.2 as superstrates. The measured maximum gain of the patch antenna with a step-index dielectric constant superstrate with a dimension of 2 lambda(0) x 2 lambda(0) was found to be 13.44 dBi, whereas the corresponding values for the uniform dielectric superstrate are 11.25 (epsilon(r) = 4.4) and 12.44 dBi (epsilon(r) = 10.2). As shown in this article, the aperture efficiency of the step-index dielectric is also higher than those of the other two.

• 出版日期2012-3
• 单位中国传媒大学