bandwidth

R2026b

Calculate absolute bandwidth of AI-based antenna

Since R2024a

Syntax

bandwidth(aiant)

[absBW,fL,fU,matching] = bandwidth(aiant)

Description

bandwidth(aiant) calculates and returns the absolute bandwidth of the AI-based antenna model.

[absBW,fL,fU,matching] = bandwidth(aiant) calculates and returns the absolute bandwidth, its lower and upper frequency bound, and impedance matching status of the AI-based antenna model.

Examples

Create and Analyze AI-Based Microstrip Patch Antenna

Create an AI-based microstrip patch antenna with a Teflon substrate operating at a frequency of 1.67 GHz.

d = dielectric("Teflon");
pAI = design(patchMicrostrip(Substrate=d),1.67e9,ForAI=true)

pAI = 
  AIAntenna with properties:

   Antenna Info
               AntennaType: 'patchMicrostrip'
    InitialDesignFrequency: 1.6700e+09

   Tunable Parameters
                    Length: 0.0601
                     Width: 0.0774
                    Height: 0.0012
         SubstrateEpsilonR: 2.1000

Show read-only properties

Use the tunableRanges function to get the tunable ranges of the antenna properties.

tunableRanges(pAI)

ans = 4×4 table
                                Length                  Width                  Height            SubstrateEpsilonR
                         ____________________    ___________________    _____________________    _________________

                           min         max         min        max         min          max        min      max 
                         ________    ________    _______    ________    ________    _________    _____    _____
                                                                                                                  
    resonantFrequency    0.051069    0.069093    0.06581    0.089037    0.001053    0.0014246     1.785    2.415  
    bandwidth            0.051069    0.069093    0.06581    0.089037    0.001053    0.0014246     1.785    2.415  
    beamwidth            0.051069    0.069093    0.06581    0.089037    0.001053    0.0014246     1.785    2.415  
    peakRadiation        0.051069    0.069093    0.06581    0.089037    0.001053    0.0014246     1.785    2.415  

Set the length and width of the antenna to values within the tunable range.

pAI.Length = 0.06;
pAI.Width = 0.078;

Calculate the absolute bandwidth of the antenna and its lower and upper bounds.

[absBW,fL,fU,matchingStatus] = bandwidth(pAI)

absBW = 
1.4642e+07

fL = 
1.6791e+09

fU = 
1.6938e+09

matchingStatus = categorical
     Matched 

Calculate the resonant frequency of the antenna.

fR = resonantFrequency(pAI)

fR = 
1.6856e+09

Convert the AI-based microstrip patch antenna to a standard microstrip patch antenna.

pm = exportAntenna(pAI)

pm = 
  patchMicrostrip with properties:

               Length: 0.0600
                Width: 0.0780
               Height: 0.0012
            Substrate: [1×1 dielectric]
    GroundPlaneLength: 0.1239
     GroundPlaneWidth: 0.1239
    PatchCenterOffset: [0 0]
           FeedOffset: [0.0126 0]
            Conductor: [1×1 metal]
                 Tilt: 0
             TiltAxis: [1 0 0]
                 Load: [1×1 lumpedElement]

Input Arguments

aiant — AI-based antenna

AIAntenna object

AI-based antenna, specified as an AIAntenna object created using the design function.

Output Arguments

absBW — Absolute bandwidth

positive scalar

Absolute bandwidth of the specified AI-based antenna in Hz, returned as a positive scalar.

Example: 2.3422e7

Data Types: double

fL — Lower frequency bound of bandwidth

positive scalar

Lower frequency bound of the bandwidth in Hz, returned as a positive scalar.

Example: 1.6679e9

Data Types: double

fU — Upper frequency bound of bandwidth

positive scalar

Upper frequency bound of bandwidth in Hz, returned as positive scalar.

Example: 1.6913e9

Data Types: double

matching — Impedance match to 50 ohms

"Matched" | "Almost" | "Not Matched"

Impedance match to 50 ohms, returned as "Matched", "Almost", or "Not Matched". When the value is:

• "Matched" — The antenna S11 dips below –10 dB.

• "Almost" — The antenna S11 dip is around –8 dB to –10 dB.

• "Not Matched" — The antenna S11 dip is around –8 dB or higher (closer to zero).

Data Types: categorical

Version History

Introduced in R2024a