Main Content


Voltage standing wave ratio of antenna



vswr(antenna,frequency,z0) calculates and plots the voltage standing wave ratio of an antenna, over specified frequency range, and given reference impedance, z0.


vswrant = vswr(antenna,frequency,z0) returns the vswr of the antenna.


collapse all

Plot vswr (voltage standing wave ratio) of a circular loop antenna.

h = loopCircular;

Figure contains an axes. The axes with title VSWR contains an object of type line.

Calculate vswr (voltage standing wave ratio) of a helix antenna.

h = helix;
hvswr = vswr(h,2e9:1e9:4e9,50)
hvswr = 1×3

    3.5730    6.7043    3.3598

Input Arguments

collapse all

Antenna object, specified as a scalar handle.

Frequency range used to calculate VSWR, specified as a vector in Hz. The minimum value of frequency must be 1 kHz.

Example: 50e6:1e6:100e6

Data Types: double

Reference impedance, specified as a scalar in ohms.

Output Arguments

collapse all

Voltage standing wave ratio, returned as a vector in dB.

See Also

Introduced in R2015a