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Urgent Fundamental Questions, pls help as soon as possible

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Ho Wong

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Dear all,

Why 2 times of the wavelength of its centre frequency * 2 times of the wavelength of its centre frequency is chosen as the dimensions of the antenna ground plane?

Why does some antennas have rectangular ground planes. Thanks a lot.

Ho Wong
 

i think its a rule of thumb but im not sure, i assume you are asking about whip antennas, anyway even a wire works(and turns your whip into a dipole. in any case what you should watch is the input impedance vs ground plane.
 

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