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calculation of RF antenna height

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prasannabalaji

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why is height for important rf antenna

hi,

i want to know how to calculate the height of an RF antenna which will transmit the signal in 915mhz can u tell the calculation how to calculate the height of RF antenna
 

It depends on the tpye of your antenna ( spiral, log periodic, dipole, parabolic) for dipole antennas lambda/2 is enough lambda=C/f where c is the speed of light and f is the frequency you do the calculation by yourself
 

if you want to use a monopole antenna, such as a whip antenna, for the best performance, you need to set the antenna height to 1/4 wavelength, i have attached a picture of monopole antenna and the link to antenna length calculator below.
**broken link removed**
here is a RF module external antenna design guide and height calculator.
 

At UHF the radio waves travel in approximate straight lines. To find out your ultimate range plot the topological cross section working on the basis of 4/3 X the earths radius, then finding edge of your service area, you then can find out what your aerial height has to be.
Frank
 

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