Answer added in Microwave Engineering6 Designing PIFAs (Planar Inverted F Antennas)By Aarti Gehani · Nirma UniversitySaiful Islam · ESEO Group1. The impedance of the PIFA can be controlled via the distance of the feed to the short pin . The closer the feed is to the shorting pin, the impedan... [more]1. The impedance of the PIFA can be controlled via the distance of the feed to the short pin . The closer the feed is to the shorting pin, the impedance will decrease; the impedance can be increased by moving it farther from the short edge. The PIFA can have it's impedance tuned with this parameter. You there if you don’t have impedance matching problem. :) 2. (up to you , try with FR4 cheapest one) 3. Possible, but why do you want that? 3. width of the pin is considered equal to that of the patch (maximum radiation efficiency) short is just a pin (or assume W << L2) in this case antenna length+ width = λ/4 i.e. smaller size. Why does the resonant length of the PIFA depend on the shorting pin length W? Intuitively, think about how a quarter-wavelength patch antenna radiates. It needs a quarter-wavelength of space between the edge and the shorting area. If W=L2, then the distance from one edge to the short is simply L1= λ/4 What about when W=0? Since it is the fringing fields along the edge that give rise to radiation in microstrip antennas, we see that the length from the open-circuited radiating edge to the shorting pin is on average equal to L1+L2 = λ/4. Be lucky...Following
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