Main Content


Calculate current at feed for antenna or array



i = feedCurrent(obj,frequency) calculates and returns the complex current in Ampere at the feed for an antenna or array object at a specified frequency. The feed current when multiplied by the antenna impedance gives the voltage across the antenna.


collapse all

Excite a monopole antenna using plane wave. Calculate the feed current at 75 MHz.

h = planeWaveExcitation('Element',monopole, 'Direction',[1 0 0])
h = 
  planeWaveExcitation with properties:

         Element: [1x1 monopole]
       Direction: [1 0 0]
    Polarization: [0 0 1]
      SolverType: 'MoM'

cur = feedCurrent(h,75e6)
cur = -0.0138 + 0.0135i

Calculate the feed current of a rounded-bowtie designed for operation at 2.4 GHz.

b  = design(bowtieRounded,2.4e9);
If = feedCurrent(b,2.4e9)
If = 0.0297 - 0.0003i

Calculate the feed current of a dipole antenna designed for operation at 70 MHz and 75 MHz.

feedCurrent(dipole, [75e6, 70e6])
ans = 1×2 complex

   0.0137 + 0.0001i   0.0089 - 0.0035i

Input Arguments

collapse all

Antenna or array object, specified as an object.

Frequency to calculate feed current, specified as a scalar integer in Hz or a vector with each element specified in Hz.

Output Argument

collapse all

Complex current, returned as a 1-by-n vector in A. This value is calculated at the feed point of an antenna or array.

Version History

Introduced in R2017a

See Also