Hi, I want to clarify some notiona in an antenna. The major components of an antenna are a generator, transmission line and an antenna (dipole). Let's say the whole system has a perfect matche, i.e. the dipole is about 70 ohms as the transmission line. If my generator ,the output voltage, is an impulse which has a duration in a micro second ( let's say 1 micro sec). So, the frequency of this generator is 1 Mhz? If the impluse is a square, the main fundamental frequency is 1 MHz and also , with others harmonics, I means if I do the Fourier Transformation am I right? Thanks, Mica
A square wave is composed of odd integer harmonics. The third, fifth, seventh, and higher order odd harmonics all have power in them. - Warren
How can I determined these odd integer harmonics ? and if is another wave form ? And the calculation of the power of these harmonics ? Thanks, Mica
http://mathworld.wolfram.com/FourierSeriesSquareWave.html Look at equation 6. The third harmonic has a frequency three times that of fundamental, and has an amplitude one-third that of the fundamental. The fifth harmonic has a frequency five times that of the fundamental and an amplitude one-fifth that of the fundamental. - Warren
Thanks for the information. So, for my dipole radited efficiently, I just match the right frequency output of the generator ? I mean like if my dipole resonances at 1 GHz so, my impluse (voltage source) duration will be 1/1 GHz ( 1 nano second) independent of the wave form? Mica