lumpedElement

Create a resistor with 50 Ohms of impedance. Any pure resistive load has a nonvariable impedance when the frequency changes.

le = lumpedElement(Impedance=50);

Create a dipole antenna. Calculate the impedance of the antenna without loading the antenna.

d = dipole;
i1 = impedance(d,70e6)

i1 = 
73.0370 - 0.4188i

Load the antenna using a frequency-independent resistor. Calculate the impedance of the antenna.

d.Load = le;
i1e1 = impedance(d,70e6)

i1e1 = 
1.2304e+02 - 4.1883e-01i

Change the frequency to 85 MHz and calculate the impedance of the antenna.

ile2 = impedance(d,85e6)

ile2 = 
2.2377e+02 + 1.1341e+02i

Create a dipole antenna using one load at the antenna feed and one load at a location above the antenna feed.

Create a dipole antenna.

d = dipole;

Create two lumped elements to load the dipole antenna.

One lumped element of impedance, 50 Ohms, loads the antenna at the feed.

l1 = lumpedElement(Impedance=complex(50,-20),Location="feed");

The second lumped element of complex impedance, 50 + j*20 Ohms, loads the antenna at the top. Locate the load half distance from the feed.

l2 = lumpedElement(Impedance=complex(50,-20),Location=[0 0 0.5]);

Add the two loads to the dipole antenna.

 d.Load = [l1, l2];

View the dipole antenna.

show(d);