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vswr

Voltage standing wave ratio of antenna

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Syntax

vswr(antenna,frequency,z0)
vswrant = vswr(antenna,frequency,z0)

Description

example

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

example

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

Examples

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Open Live Script

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

h = loopCircular;
vswr(h,50e6:1e6:100e6,50)

Figure contains an axes object. The axes object with title VSWR, xlabel Frequency (MHz), ylabel Magnitude contains an object of type line.

Open Live Script

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

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

    3.5836    6.7163    3.3699

Input Arguments

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Antenna object, specified as a scalar.

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

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

Version History

Introduced in R2015a

See Also