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impedance

Input impedance of antenna; scan impedance of array

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);

Figure contains an axes object. The axes object with title Impedance contains 2 objects of type line. These objects represent Resistance, Reactance.

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 ×

   0.2976 - 1.7632i   0.2976 - 1.7632i
   0.3089 - 1.6801i   0.3089 - 1.6801i
   0.3204 - 1.5989i   0.3204 - 1.5989i
   0.3322 - 1.5193i   0.3322 - 1.5193i
   0.3441 - 1.4411i   0.3441 - 1.4411i
   0.3564 - 1.3643i   0.3564 - 1.3643i
   0.3689 - 1.2887i   0.3689 - 1.2887i
   0.3816 - 1.2142i   0.3816 - 1.2142i
   0.3947 - 1.1406i   0.3947 - 1.1406i
   0.4081 - 1.0678i   0.4081 - 1.0678i
      ⋮

Input Arguments

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Antenna object, specified as a scalar.

Array object, specified as a scalar.

Frequency range to calculate impedance, specified as a scalar in hertz or a vector with each element unit 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.

Version History

Introduced in R2015a

See Also