theoretical maximum value of the antenna gain is 19.5 dB. The gain of the patch antenna with metamaterial structure is already very close to the theoretical maximum value of antenna with the same size and operating frequency.
CONCLUSIONA new patch antenna with a metamaterial cover has been designed. Then, the radiation characteristics of a patch antenna with and without metamaterial structure are measured. The measured results show an about 10 dB addition in the antenna gain in comparison with the conventional antenna, thus the radiation characteristics of antenna with metamaterial structure are remarkably improved. Since, the ring aperture lattice is insensitive to the direction of arrival wave and independent to the wave polarization, this structure is much more useful than some kinds of EBG covers in some specific applications.
REFERENCES
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