feedCurrent

Calculate current at feed for antenna or array

Syntax

i = feedCurrent(object,frequency)

Description

i = feedCurrent(object,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.

Examples

Feed Current of Monopole Antenna Excited By Plane Wave

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 = 
-0.0135 + 0.0135i

Feed Current of Rounded-Bowtie Antenna

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 = 
0.0298 + 0.0010i

Feed Current of Dipole Antenna

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 + 0.0000i   0.0089 - 0.0036i

Input Arguments

object — Antenna or array

antenna object | array object | custom 2-D mesh or geometry object | custom 2-D and 3-D antenna object | pcbStack object | installedAntenna object | planeWaveExcitation object | wireStack object

Antenna or array to calculate the current at its feed, specified as one of these options:

• Antenna object from the antenna catalog.

• Array object from the array catalog.

• Custom 2-D mesh or geometry object.

• Custom 2-D and 3-D antenna object.

• pcbStack object.

• installedAntenna object.

• planeWaveExcitation object.

• wireStack object.

Note

feedCurrent function does not calculate feed current for the infiniteArray object.

Example: planeWaveExcitation

frequency — Frequency to calculate feed current

positive scalar | positive vector

Frequency to calculate the feed current, specified as a scalar for a single frequency or a vector for a frequency range in Hertz.

Example: 70e6

Data Types: double

Output Argument

i — Complex current

1-by-n vector in A

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

Example: 0.0182 - 0.0032i

Data Types: double
Complex Number Support: Yes

Version History

Introduced in R2017a