Construction and Calculation of Conformal Antennas CST 2008 vs ...
Construction and Calculation of Conformal Antennas CST 2008 vs ...
Construction and Calculation of Conformal Antennas CST 2008 vs ...
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<strong>Construction</strong> <strong>and</strong> <strong>Calculation</strong><br />
<strong>of</strong> <strong>Conformal</strong> <strong>Antennas</strong><br />
<strong>CST</strong> <strong>2008</strong> <strong>vs</strong>. <strong>CST</strong> 2009<br />
Yishai Brill, IAI - MLM<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
XXXX-(GD)08
The conformal antenna<br />
Useful in many applications:<br />
On flexible substrates<br />
“Hidden” antennas<br />
Very low pr<strong>of</strong>ile<br />
The Difficulties in Modeling<br />
The Body might have several faces<br />
Conductors have to be perfectly tangent to the shape<br />
<strong>of</strong> the body<br />
Even more difficult if the conductors have bends,<br />
slots, perturbations etc.<br />
Usually, we need the assistance <strong>of</strong> an experienced<br />
mechanical engineer, importing his model, <strong>and</strong><br />
working with non-editable solids<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Modeling a simple patch antenna on a cylinder<br />
We’d like to calculate the performance <strong>of</strong> a simple<br />
s-b<strong>and</strong> patch antenna on a sector <strong>of</strong> a cylinder<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Modeling in <strong>CST</strong> <strong>2008</strong><br />
Even a relatively simple structure<br />
is complex to build<br />
One has to use dummy solids<br />
<strong>and</strong> perform many Boolean<br />
operations<br />
In the case <strong>of</strong> a cylinder one<br />
must calculate the relative angle<br />
to cut out from the whole shape:<br />
length<br />
Perimeter<br />
0<br />
360<br />
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reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Modeling in <strong>CST</strong> <strong>2008</strong> (Continued)<br />
Cutting out the feeding<br />
microstrip line<br />
Slicing the conductor to mesh<br />
the microstrip <strong>and</strong> the patch<br />
separately<br />
Final model<br />
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reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Antenna performance (<strong>CST</strong> <strong>2008</strong>)<br />
<strong>Calculation</strong> Settings:<br />
Open boundaries (Add Space)<br />
Energy criterion -40dB<br />
Specific mesh settings to each solid<br />
Adaptive Mesh Refinement – Energy Based<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Modeling in <strong>CST</strong> 2009<br />
Added new Bend Sheet feature (Objects -> Bend<br />
Sheet)<br />
Simple <strong>and</strong> straight forward<br />
Applies only for sheets <strong>and</strong> not solids<br />
Sheet must touch the face it bends on<br />
Objects -> Bend Sheet<br />
Duplicating the sheets,<br />
<strong>of</strong>fsetting <strong>and</strong> l<strong>of</strong>ting to<br />
realize conformal solids<br />
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reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Antenna performance (<strong>CST</strong> 2009)<br />
<strong>Calculation</strong> Settings:<br />
Open boundaries (Add Space)<br />
Energy criterion -40dB<br />
Specific mesh settings to each solid<br />
Adaptive Mesh Refinement – Energy Based<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Comparison <strong>of</strong> Results<br />
•Identical radiation<br />
patterns<br />
•Final no. <strong>of</strong> mesh cells<br />
after adaptive meshing in<br />
<strong>CST</strong> 2009 is slightly higher<br />
than in <strong>CST</strong> <strong>2008</strong><br />
•Almost identical S11<br />
results<br />
<strong>CST</strong> <strong>2008</strong><br />
<strong>CST</strong> 2009<br />
<strong>CST</strong> <strong>2008</strong><br />
<strong>CST</strong> 2009<br />
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This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Solver Time<br />
<strong>CST</strong> <strong>2008</strong><br />
<strong>CST</strong> 2009<br />
Computer<br />
Specs:<br />
CPU<br />
Type:DualCo<br />
re Intel Core<br />
2 Duo<br />
E6600, 3433<br />
MHz<br />
4GB RAM<br />
Windows XP<br />
64Bit<br />
Performance<br />
improvement is<br />
clearly noticed<br />
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reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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A more complex example<br />
Notches <strong>and</strong> other perturbations are <strong>of</strong>ten used for<br />
matching <strong>and</strong> b<strong>and</strong> broadening<br />
A laborious task without the bending sheet feature<br />
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reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Summary<br />
<strong>Construction</strong> <strong>of</strong> conformal antennas is<br />
easier now with the bend sheet feature<br />
It is possible to use complex sheets<br />
Getting the same accuracy as before<br />
Almost the same amount <strong>of</strong> mesh cells is<br />
generated<br />
Solver time is ~25% shorter<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
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Thank You<br />
Unclassified<br />
This document contains proprietary information <strong>of</strong> Israel Aerospace Industries Ltd. <strong>and</strong> may not be<br />
reproduced, copied, disclosed or utilized in any way in whole or in part, without the prior written consent <strong>of</strong><br />
Israel Aerospace Industries Ltd<br />
XXXX-(GD)08
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