In one of the paper, the patch antenna was designed at 2.45 GHz resonant frequency without metasurface. The dimensions of the antenna were W=40 mm and L=29 mm. After CSRR loading the resonant frequency was shifted to 2.35 GHz. The new dimensions of reduced sized antenna were W=18.6 mm and L=14 mm. That means more than 50% size reduction, they achieved. But as per Patch antenna design equations of W and L at 2.35 GHz the dimensions are W=38.36 mm and L=30.31 mm since frequency scaling ratio is 0.959. I couln't follow the approach of author as to how they are getting more than 50% size reduction. What is the exact method of size reduction?
I am not sure what is in this paper since you did not cite it. In general, if you load a patch antenna with higher permittivity, it will let you reduce the size of the antenna because you have slowed the wave and reduced wavelength. The price is a worse impedance match and maybe other things. Perhaps in the paper the patch was simply impedance loaded to slow the wave and reduce size.
Thanks Sir. I am sharing the paper with you personally. My question is shuould I use the equation [fr(new)/fr(original)]= [initial width/reduced width] to calculate the reduced dimensions or should I opt for optimetrics analysis of software like HFSS? Obviously, the answers will vary.
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