MATLAB: How does ANTENNA DESIGNER APP calculate the Dipole length

antenna designer appAntenna Toolboxdipole length

How does ANTENNA DESIGNER APP calculate the Dipole length?

Best Answer

From the documentation:

Length — Dipole length

2 (default) | scalar

Dipole length, specified as a scalar in meters. By default, the length is chosen for an operating frequency of 75 MHz.

There are also references on bottom of the page for dipole

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MATLAB: Dipole antenna far-field pattern

Hi Vinci, power is proportional to the square of the electric field, so if you use

E2 = abs((cos(B*L/2*cos(t))-cos(B*L/2))./sin(t)).^2;
figure()
polar(t,E2)

the correct figure should pop up.

MATLAB: Need to plot 10 db return loss fractional bandwidth of a dipole antenna

I am assuming that the value of resonant frequency is 72 MHz instead of 72 Hz since the range of frequencies specified is from 20 MHz to 120 MHz. Here are a few pointers which may be able of help in solving the above problem:

The return loss of the dipole antenna can be calculated by using the function “returnLoss()” which takes the antenna, frequency range and the reference impedance as arguments. The syntax given below may be used to calculate the return loss:

antennaLoss = returnLoss(d, 20e6:1e6:120e6,75);

Antenna bandwidth is the range of frequencies over which the value of “antennaLoss” variable is greater than 10dB. Fractional bandwidth is computed as Antenna bandwidth divided by center frequency(or resonant frequency)

Please make use of the following code snippet for your reference

clear;
d = dipole;
freqRange = 20e6:1e6:120e6;
resonantFreq = 72e6;
%impedance(d,20e6:1e6:120e6);
antennaLoss = returnLoss(d,freqRange,75);
%rfplot(S)
antennaBW = freqRange(antennaLoss>10);
fracBW = (antennaBW(end) - antennaBW(1))/resonantFreq;

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Related Solutions

MATLAB: Dipole antenna far-field pattern

MATLAB: Need to plot 10 db return loss fractional bandwidth of a dipole antenna

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