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hi, I have this dual band antenna at 2.44 GHz and 5.6 GHz, I want to add two more resonances to it at 6 GHz and 6.8 GHz, without affecting other resonances...is there any optimal way..? how and where to do that....??any paper or technical reference ?
Predicting a single resonance in an antenna shape like this (without using an EM simulator), is harder than winning a jackpot.
As you see from the current distribution for the two existing resonances, the layout use two "ringlets", one for each resonant frequency.
Perhaps you need adding another two ringlets, both shorter than the one made for 5.6GHz, and tune them using an EM simulator for the two new frequencies. For sure the existing resonance (2.44GHz and 5.6GHz) will change also, but you have to do a compromise making all four elements to resonate.
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