Workshop Rectangular Patch Antenna
Introduction to ANSYS HFSS
Demo - Rectangular Patch Antenna Simulation
Principle :Design A micro-strip patch antenna for 5.2 GHz application and study s-parameter, Gain and field animations
Problem Statement : Micro-strip patch antenna of solution frequency F0 with FR4 Epoxy material as substrate.
Ansys HFSS is used for the simulation
Find the value of return loss for a given frequency range. Why it is minimum at the designed frequency?
Create the E-Field and J-Surface plots and Animate. Study the Fringing field effect of the antenna by using field
animations.
Plot the Radiation pattern in 2D and 3D format and find the peak gain, Directivity , efficiency, and Half power beam
width of the antenna.
Design a micro-strip patch antenna at 2.4 GHz with the same FR4 Epoxy substrate and calculate the parameters
mentioned above.
Analytical Approach- Design Equations
The Performance of the microstrip patch antenna depends on its resonant
frequency, dimension. Depending on the dimension, the operating frequency,
radiation efficiency, directivity, return loss are influenced. For an efficient
radiation, the practical width of the patch can be calculated by using the
following.
And the length (L) of the antenna becomes,
where
Where is the wave length, fr is the resonant frequency, L and W are the length and width of the patch element respectively and
r is the dielectric constant.
Analytical Approach- Design Equations
Characteristic impedance of the patch can be found by
Impedance of transition section:
Width of transition line WT:
Length of transition line:
Width of 50 microstrip transmission line:
Where Z0= 50
Length of the microstrip transmission line
Width of Edge Feed
Width of Feed Line
Length of Edge Feed
Length of Feed Line
Rectangular Patch Antenna Geometry
Creating the Design
Opening a New Project
In HFSS Desktop, click the On the Standard toolbar, or
select the menu item File > New.
From the Project menu, select Insert HFSS Design.
Set Solution Type
Select the menu item HFSS > Solution Type
Choose Driven Terminal
Choose Network Analysis
Click the OK button
Set Model Units
Select the menu item Modeler > Units
Select Units: mm
Click the OK button
Substrate Creation
Dielectric substrate material
Attribute Option
Creating the Patch Geometry
Creating the patch
Patch
Create Feed line & Edge feed
Edge Feed
Feed line
Creating the Ground Geometry
Uniting the Patch, Feed line and Edge feed
Note: The resulting united object name will depend on the order selected
(i.e. if patch is selected first, the final name will be patch)
Select Patch, Feed and Edge feed
Assigning Boundary Conditions: Perfect ESelect the objects named: patch (or feed), ground
Note: Your object names may differ depending on the order they
were selected in the previous unite operation. Select the object feed
or patch
Create Air Box
Assigning Boundary Condition -Radiation
ExcitationsPort Definitions
Wave Port
Represents 2D Cross Section of a transmission line
Can handle multiple modes or terminals
Defined on planar surface or face
Must encompass all fields that impact transmission line behavior
Computes these TL quantities
Characteristic Impedance
Propagation Constant
Field Configurations
Simulation Setup: Driven Modal, Driven Terminal
Lumped Port
Represents a voltage source placed between conductors
Can only handle a single TEM mode or terminal
Defined on planar surface or face
Must be placed between conductor
User must specify Characteristic Impedance
Simulation Setup: Driven Modal, Driven Terminal
Port SetupCreate Rectangle Used for Lumped Port
Set the Drawing Grid Plane
Select the menu item Modeler > Grid Plane > ZX
Dimensions of Lumped portPort Name: 1
Conductor: ground
Use as Reference:
Checked
Highlight Selected
conductors: Checked
Click the OK button
Analysis Setup
Adaptive Frequency
Basis Order
Iterative Solver
Note : -
The Solution Frequency sets:
The frequency used to create the adaptive mesh.
Defines the spatial resolution of the mesh through the
Lambda Refinement step
Lambda Refinement is wavelength dependant.
Determines the frequency used to evaluate the meshs
convergence.
Typically choose the highest frequency of interest or for
resonant antennas, the resonant frequency
Analysis Setup
Add Sweep
HFSS Frequency Sweep Type: Overview
Discrete Solves using adaptive mesh at every frequency
Matrix Data and Fields at every frequency in sweep
Fast - ALPS
Matrix Data and Fields at every frequency in sweep
Interpolating Adaptively determines discrete solve
points using the adaptive mesh
Matrix Data at every frequency in sweeps
Fields at last adaptive solution
Adding a Frequency Sweep
Analyze
Model Validation
Select the menu item HFSS > Validation Check
Click the Close button
Note: To view any errors or warning messages, use the Message Manager.
Analyze
Select the menu item HFSS > Analyze All
ValidateAnalyze All
Post Processing: 2D Rectangular Plot, S-Parameters
Minimum Return loss at 5.2GHz
Generate the Report
Post Processing Field Overlay, E-Field
Fringing field
Select the FaceRight Click
Generate the Report
Post Processing: 3D Radiation Pattern, Gain
Create a Radiation Setup
Post Processing: 2D Radiation Pattern, GainFor selecting E-Plane and H-Plane pattern
THANK YOU
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