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Where To Find This Example

AWR Version 14


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Understanding AWR .emz Files

AWR Version 13


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Understanding AWR .emz Files

AWR Utilities

Design Notes

Coax Fed Patch Antenna with Waveport at Different Location

This example demonstrates the use of a coaxial probe-fed rectangular microstrip patch antenna.  Analyst’s finite element wave ports are used to drive the antenna and radiation patterns and feed return loss and input impedance are calculated.

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This project does not include the datasets, therefore simulating this project will take approximately twenty minutes. However this example is available with datasets at : http://kb.awr.com/display/Examples/Coax_Fed_Patch_Antenna

Overview

The design is a coaxial probe-fed rectangular microstrip patch antenna on a finite dielectric substrate and a finite ground plane.  Perfectly Matched Layer (PML) boundary conditions are used on the 3D enclosure except for a circular region through which the coax line feeds the antenna.  Principal plane radiation patterns at Phi equals 0 and 90 degrees are plotted at 7.8 GHz along with the feed return loss and input impedance.

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This example also demonstrates how the finite dielectric substrate is setup in the 2.5D layout environment in Microwave Office. This is done by mapping the drawing layer “+LAY_3_SubFinite_COND” with a dielectric material “SubFinite”. It should also be noted that the finite ground is drawn with a circular hole. Move the “Coaxial_Feed” in 2D layout view to see the hole. Without this hole, the Coax feed would be short circuited.

Understanding Analyst Wave Port Calculations in the EM Structures

“ExtendedCoax” - this is the structure where the wave port solution includes only the cross-section of the coax line with its TEM mode.  Since the lower boundary of the 3D structure is a PML the radiating fields fringe around the bottom face resulting in a significant back lobe in the radiation pattern graph.

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The “ExtendedCoax” setup is therefore a better real-world arrangement, whereas the “TouchingBoundary” document shows the behavior of Analyst’s wave port solution.

Radiation pattern measurements

The total power far field radiation pattern measurement is found under Electromagnetic > Antenna > Sweep Theta > PPC_TPwr. Phi=0 gives the XZ plane cut, and Phi=90 gives the YZ plane cut. The graphes show the directivity patterns as none of the two options for including losses is checked.

EM Structure - ExtendedCoax

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EM Structure 3D - ExtendedCoax

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Graph - Return Loss in dB

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Graph - Principal Plane Phi at 0 degrees

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