Using zero refractive index materials to improve the directivity of horn antenna
Zhao Feng，Huang Runsheng*
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School of Physics，Nanjing University，Nanjing，210093，China
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Published
2017-08-02
Issue Date
2017-08-02
Abstract
In this paper，a kind of zero refractive index material(ZRM)based on metal wire array model was designed and manufactured.A simulation experiment was carried out to get the S parameter of this material and then an S parameter retrieved method was used to retrieve the effective index of refraction of the material.It turns out that at 9.40 GHz the real part of effective index of refraction of the material is 0.05，the imaginary part of effective index of refraction of the material is 0.019，which is very close to zero.A waveguide simulation experiment was performed to test whether the material had the characteristic of zero refractive index material at 9.40 GHz，and its result shows that the material do have the characteristic of zero refractive index material at that frequency.Zero refractive index material flat slab can be seen as a directional filter which can only allow normal light to pass，so this characteristic can be used to improve the directivity of horn antenna.A horn antenna model was built and the zero refractive index material was added on the horn mouth.After simulation，the result turned out to be that the zero refractive index material has improvement in directivity of horn antenna.The antenna’s E－plan half power beam width has decreased from 18.0° to 17.6°，E－plan side lobe has decreased from －8.6 dB to －19.5 dB，H－plan half power beam width has decreased from 18.1° to 13.4°，E－plan side lobe has decreased from －26.0 dB to －27.1 dB，gain has increased from 19.7 dB to 21.1 dB，and the waveform of electromagnetic wave which exited from horn antenna approximates plan wave.Then Printed circuit method was used to manufacture the zero refractive index material and the material was added on the horn antenna which had the same size of the horn antenna built before.A simple electromagnetic measuring device was used to carry out a contrast experiment.The result of the contrast experiment showed that the zero refractive index material do have improvement in directivity of horn antenna.
Zhao Feng，Huang Runsheng*.
Using zero refractive index materials to improve the directivity of horn antenna[J]. Journal of Nanjing University(Natural Sciences), 2017, 53(4): 700
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