impedance

Input impedance of antenna; scan impedance of array

Syntax

impedance(antenna,frequency)
z = impedance(antenna,frequency)
impedance(array,frequency,elementnumber)
z = impedance(array,frequency,elementnumber)

Description

example

impedance(antenna,frequency) calculates the input impedance of an antenna object and plots the resistance and reactance over a specified frequency.

example

z = impedance(antenna,frequency) returns the impedance of the antenna object, over a specified frequency.

impedance(array,frequency,elementnumber) calculates and plots the scan impedance of a specified antenna element in an array.

z = impedance(array,frequency,elementnumber) returns the scan impedance of a specified antenna element in an array.

Examples

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Calculate and plot the impedance of a planar dipole antenna over a frequency range of 50MHz - 100MHz.

h = dipole;
impedance (h,50e6:1e6:100e6);

Calculate scan impedance of default linear array over a frequency range of 50MHz to 100MHz.

h = linearArray;
z = impedance(h,50e6:1e6:100e6)
z = 51×2 complex
102 ×

   0.2887 - 1.7446i   0.2887 - 1.7446i
   0.2999 - 1.6634i   0.2999 - 1.6634i
   0.3114 - 1.5838i   0.3114 - 1.5838i
   0.3231 - 1.5059i   0.3231 - 1.5059i
   0.3351 - 1.4293i   0.3351 - 1.4293i
   0.3474 - 1.3541i   0.3474 - 1.3541i
   0.3599 - 1.2800i   0.3599 - 1.2800i
   0.3728 - 1.2069i   0.3728 - 1.2069i
   0.3860 - 1.1346i   0.3860 - 1.1346i
   0.3995 - 1.0631i   0.3995 - 1.0631i
      ⋮

Input Arguments

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Antenna object, specified as a scalar handle.

Array object, specified as a scalar handle.

Frequency range to calculate impedance, specified as a vector in Hz.

Example: 50e6:1e6:100e6

Data Types: double

Antenna element number in array, specified as a scalar.

Example: 1

Data Types: double

Output Arguments

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Input impedance of antenna or scan impedance of array, returned as a complex number in ohms. The real part of the complex number indicates the resistance. The imaginary part of the complex number indicates the reactance.

Note

Antenna Toolbox™ caches the impedance values while running for the first time so that the subsequent runs are faster.

See Also

Introduced in R2015a