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Optimization of a Dual Band Slot Antenna using ANSYS HFSS and optiSLang, Exercises of Microwave Engineering and Acoustics

Information on the optimization of a dual band slot antenna using ansys high frequency structure simulator (hfss) and optislang. The challenges in antenna design, simulation setup, and solution process in hfss. It also includes details on optimizing the antenna design to minimize return loss at both frequencies. From the prace autumn school 2013 held at the university of ljubljana.

Typology: Exercises

2014/2015

Uploaded on 05/08/2015

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Optimization of a Dual Band
Slot Antenna using ANSYS®
HFSS and optiSLang®
Christian Römelsberger
PRACE Autumn School 2013 - Industry Oriented HPC Simulations, September
21-27, University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana,
Slovenia
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Download Optimization of a Dual Band Slot Antenna using ANSYS HFSS and optiSLang and more Exercises Microwave Engineering and Acoustics in PDF only on Docsity!

Optimization of a Dual Band

Slot Antenna using ANSYS

HFSS and optiSLang

Christian Römelsberger

PRACE Autumn School 2013 - Industry Oriented HPC Simulations, September

21-27, University of Ljubljana, Faculty of Mechanical Engineering, Ljubljana,

Slovenia

© 2013 CADFEM GmbH

Antenna Simulation

  • 1 -

 Tricky business to adjust antennas:

 Minimize return loss  Radiation pattern: Main lobe, side lobes  Polarization  Band width  Several bands  Impedance matching: Smooth transition from 50Ω to 377Ω

 Use simulation to

 Validate that antenna design meets requirements.  Gain understanding of the design.  Optimize the design.

© 2013 CADFEM GmbH

HFSS – High Frequency Structure Simulator

  • 3 -

 3D Field Solver

 3D Finite Element Method (FEM)  Boundary Integral (IE)  Mesh Process: Adaptive

 Advanced Boundary Types

 Radiation and Perfectly Matched Layers  Symmetry, Finite Conductivity, Infinite Planes, RLC, and Layered Impedance

 Advanced Material Types

 Frequency dependent  Anisotropic

 Post Processing and Report Type

 SYZ parameters  Field display  Near Field/Far Field

  • 4 - © 2013 CADFEM GmbH

Antennas: Solution Process in HFSS

Create Initial Mesh

Solve fields using the Finite Element Method

Max(|DS|)<goal? Calculate local Solution error

Generate New Mesh

Calculate broad band S-parameters (if desired)

no

yes

Start

First Pass only

Any variable may be

used to define solution

convergence.

Max(|DX|)<goal?

Directivity

Realized Gain

Peak | E |

Stored energy

etc…

mesh refined where

field gradients are largest!

  • 6 - © 2013 CADFEM GmbH

Optimization of a Dual Band Slot Antenna

 Goal: minimize the return loss at both frequencies

  • 7 - © 2013 CADFEM GmbH

Optimization of a Dual Band Slot Antenna

 Set up region

 Set up the simulation for a single design point:

 Boundaries  Radiation on the boundary of the region  Finite conductivity at metalized surfaces  Excitation  Lumped port at the end of the microstrip  Analysis Setup  5.8GHz  2.4GHz with mesh linked to the 5.8GHz setup  Frequency sweep 1.5GHz – 7GHz

 Solve

 Postprocessing

 Return Loss  Currents  Gain

© 2013 CADFEM GmbH

Optimization of a Dual Band Slot Antenna

  • 9 -

 Do a validation check

 Much improved Return Loss

-22.501.00 2.00 3.00 (^) Freq [GHz]4.00 5.00 6.00 7.

-20.

-17.

-15.

-12.

-10.

-7.

-5.

-2.

dB(St(Feed_T1,Feed_T1))

XY Plot 1^ HFSSDesign

m m

Name m1 m2 (^) 2.43005.6900X (^) -19.3580-21.1131Y Setup1 : Sw eep dB(St(Feed_T1,Feed_T1)) Curve Info

  • 10 - © 2013 CADFEM GmbH

Optimization of a Dual Band Slot Antenna

 Resonances