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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 = 
   1.0e+02 *

   0.2752 - 1.6569i   0.2752 - 1.6569i
   0.2864 - 1.5805i   0.2864 - 1.5805i
   0.2979 - 1.5058i   0.2979 - 1.5058i
   0.3097 - 1.4325i   0.3097 - 1.4325i
   0.3219 - 1.3605i   0.3219 - 1.3605i
   0.3343 - 1.2896i   0.3343 - 1.2896i
   0.3471 - 1.2197i   0.3471 - 1.2197i
   0.3603 - 1.1507i   0.3603 - 1.1507i
   0.3739 - 1.0825i   0.3739 - 1.0825i
   0.3880 - 1.0149i   0.3880 - 1.0149i
   0.4025 - 0.9477i   0.4025 - 0.9477i
   0.4176 - 0.8810i   0.4176 - 0.8810i
   0.4332 - 0.8145i   0.4332 - 0.8145i
   0.4495 - 0.7481i   0.4495 - 0.7481i
   0.4664 - 0.6817i   0.4664 - 0.6817i
   0.4841 - 0.6152i   0.4841 - 0.6152i
   0.5027 - 0.5484i   0.5027 - 0.5484i
   0.5221 - 0.4812i   0.5221 - 0.4812i
   0.5426 - 0.4135i   0.5426 - 0.4135i
   0.5642 - 0.3451i   0.5642 - 0.3451i
   0.5871 - 0.2759i   0.5871 - 0.2759i
   0.6114 - 0.2058i   0.6114 - 0.2058i
   0.6372 - 0.1345i   0.6372 - 0.1345i
   0.6648 - 0.0620i   0.6648 - 0.0620i
   0.6944 + 0.0120i   0.6944 + 0.0120i
   0.7261 + 0.0875i   0.7261 + 0.0875i
   0.7604 + 0.1649i   0.7604 + 0.1649i
   0.7973 + 0.2442i   0.7973 + 0.2442i
   0.8374 + 0.3257i   0.8374 + 0.3257i
   0.8811 + 0.4095i   0.8811 + 0.4095i
   0.9287 + 0.4958i   0.9287 + 0.4958i
   0.9808 + 0.5848i   0.9808 + 0.5848i
   1.0381 + 0.6767i   1.0381 + 0.6767i
   1.1013 + 0.7716i   1.1013 + 0.7716i
   1.1711 + 0.8698i   1.1711 + 0.8698i
   1.2486 + 0.9712i   1.2486 + 0.9712i
   1.3348 + 1.0759i   1.3348 + 1.0759i
   1.4311 + 1.1840i   1.4311 + 1.1840i
   1.5390 + 1.2952i   1.5390 + 1.2952i
   1.6602 + 1.4092i   1.6602 + 1.4092i
   1.7968 + 1.5254i   1.7968 + 1.5254i
   1.9511 + 1.6430i   1.9511 + 1.6430i
   2.1257 + 1.7606i   2.1257 + 1.7606i
   2.3237 + 1.8762i   2.3237 + 1.8762i
   2.5484 + 1.9872i   2.5484 + 1.9872i
   2.8034 + 2.0895i   2.8034 + 2.0895i
   3.0921 + 2.1778i   3.0921 + 2.1778i
   3.4179 + 2.2452i   3.4179 + 2.2452i
   3.7831 + 2.2822i   3.7831 + 2.2822i
   4.1884 + 2.2770i   4.1884 + 2.2770i
   4.6313 + 2.2153i   4.6313 + 2.2153i

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.

See Also

Introduced in R2015a

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