1- A one-meter long wire antenna is center fed by a source with frequency 30 MHz

Question

1- A one-meter long wire antenna is center fed by a source with frequency 30 MHz :

i- find the wavelength and the current distribution along the antenna .
ii- find the radiation resistance.
iii- if the source is now replaced by another with frequency = 150 MHz , find the new current distribution & the radiation resistance
iv- compare between the results for the two sources above and comment.

2- consider a 3/4 linear wire antenna which is fed at the center,find :

i- the current distribution on the wire.
ii- for the input current of .7 Amp, find the loop current (I0) , and the maximum radiated E at r = 1000 m
iii- given that the radiation resistance of this antenna is 190 ohm (referred to I0), what is the maximum directivity ?

Explanation / Answer

This might be helpful. http://cas.ee.ic.ac.uk/people/dario/files/E22/PS4Q.pdf

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