Can any one offer a qualitative solution as to why partial grounding helps in enhancing bandwidths in patch antenna?
The ground plane is also resonant - usually at much lower frequencies than the patch. Making the ground plane smaller or making holes in it can move the resonance to the working band and can be used to improve the bandwidth.
Partial ground planes and ground planes with specially designed slots play a key role in obtaining UWB behavior. Basically, partial grounds reduce the energy stored in the substrates. The reduction of energy storage in the substrates causes to decrease in Quality factor. As Q factor decreases, bandwidth increases. Partial ground plane means back radiation. Therefore, more radiation loss. hence, Q factor decreases and as a result of that, bandwidth increases.
this dcreases the surface wave, and it acts as HIS. you should read the basic theory of AMC structurs.
Due to use of partial ground plane, stored energy (Wt) reduces, hence, Qt reduces. therefore, BW increases. I'm afraid that Surface wave may not come for conventional patch antenna.
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