Can Any body tell me how to calculate antena poles length and thickness for different frequency for cellular /microwave use with out going through long calculations etc.and also the material selection .
The Ham radio guys sometimes do it. I have seen a aerial design fixed by tying different lengths of solder to it until the result was satisfactorily. Only to find out later that the design was OK but the fault was in their testing equipment.
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The theory says that, in order to have a maximum transfer of power from the transmitter to the air, the length of the antenna should be a multiple of quarters of wave length. So, if you use 2.5 GHz transmitter, the length of the antenna should be:
lambda[meter] = 300/frequency[MHz]
L=300/2500=12cm. L/4=3cm
Therefore, your antenna should be 3cm. Now, the impedance that this antenna presents to the transmitter should be matched with the calculated load for your transmitter. Thus avoiding reflected waves that might even destroy your transmitter. There are some correction coefficients but this is what the guys were mentioning about trial and error.
The antenna could be even shorter, as a compromise that the designer choses, but his work in matching the impedances is harder and, of coarse, the power is less than the theoretical one in a quarter lambda.
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Microwave antenna design
Re: Microwave antenna design
