Any reflective surface of the dielectric material increases the gain of patch antenna, but when metamaterial is used as a superstrate layer on the patch antenna why the gain is improved more? What is the difference between any reflective surface and metasurface in the case of patch antenna?
I'm not sure, but the patch may act as a feed to the metamaterial resulting in a larger aperture in the metamaterial layer than the area of the patch. The metamaterial may have the property of evening out the phase over the larger aperture, which is needed for increased gain. For flat phase, larger area equates to higher gain.
Greetings.
Please have a look at the following attached papers. Hope this helps you.
Thanks
Thank you Shipra Bhatia and Malcolm White sir for your valuable time, but I went through these papers. It doesn't actually explain that any reflective surface as a superstrate can increase the
gain of the patch antenna then why we need metamaterial as superstrate?
A metamaterial is not just, or perhaps not even, a reflective surface. It can have lots of special properties, like having equal phase across its surface, which would increase gain considerably.
Hi
Actually, the metamaterial layer harvests energy. For a better description, it is worked as a lense layer for concentrating electromagnetic field.
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