Change the resonance frequency of a monopole.

I want to design a monopole whose resonance frequency is 2477 MHz. I need the following dimensions:

• Height = 10 cm.
• Width = 0.00192 cm.
• Ground plane = 10X10cm.

Initially, modifying this conditions, if I plot the S11 parameter the resonance frequency is approximately 2200 MHz.

I am trying to cancel the reactive component of the impedance, but I can't move the frequency until 2477 MHz. I have tried to design a specific capacitor with the same purpose, but I have obtained the same result.

Can anyone help me? Thank you.

clear all; clc; close all; format long;

%% Simulation parameters
freq = 2477e6;                             
freqRange = 1500e6:1e6:3500e6;             
speedOfLight = physconst('lightspeed');    
lambda = speedOfLight/freq;                

%% Antenna parameters.
ant = monopole;
ant.Height = 0.1;                          
ant.Width = 0.00192;                       
ant.GroundPlaneLength = 0.1;              
ant.GroundPlaneWidth = 0.1;                

%% Impedance
Z0 = 50;                                   
ZL = impedance(ant,freq);                  
ZL_norm = ZL/Z0;                           
RL = real(ZL);                             
XL = imag(ZL);                            

%%
%Initial S11 parameter
figure('Name','Initial S11 parameter');
S = sparameters(ant,freqRange); 
rfplot(S) 

%% Reactive part cancellation.
RL_load = RL;
XL_load = 0;
load = lumpedElement('Impedance', complex(RL_load, XL_load), 'Location', [0 0 0]);
ant.Load = load;
figure('Name', 'S11 parameter after reactive part cancellation')
S = sparameters(ant,freqRange); 
rfplot(S) 

Answer 1

[Shashwat Bajpai]

To design an antenna at a particular frequency I would suggest using the design function. It auto populates the values of the dimensions of the antenna.

The link to documentation of design is provided below:

https://www.mathworks.com/help/antenna/ref/design.html?searchHighlight=design&s_tid=doc_srchtitle