Construction and Calculation of Conformal Antennas CST 2008 vs. CST 2009

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Brianne Hunter
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1 Construction and Calculation of Conformal Antennas CST 2008 vs. CST 2009 Yishai Brill, IAI - MLM This document contains proprietary information of. and may not be

2 The conformal antenna Useful in many applications: On flexible substrates Hidden antennas Very low profile The Difficulties in Modeling The Body might have several faces Conductors have to be perfectly tangent to the shape of the body Even more difficult if the conductors have bends, slots, perturbations etc. Usually, we need the assistance of an experienced mechanical engineer, importing his model, and working with non-editable solids This document contains proprietary information of. and may not be

3 Modeling a simple patch antenna on a cylinder We d like to calculate the performance of a simple s-band patch antenna on a sector of a cylinder This document contains proprietary information of. and may not be

Modeling in CST 2008 Even a relatively simple structure is complex to build One has to use dummy solids and perform many Boolean operations In the case of a

4 Modeling in CST 2008 Even a relatively simple structure is complex to build One has to use dummy solids and perform many Boolean operations In the case of a cylinder one must calculate the relative angle to cut out from the whole shape: length Perimeter This document contains proprietary information of. and may not be

5 Modeling in CST 2008 (Continued) Cutting out the feeding microstrip line Slicing the conductor to mesh the microstrip and the patch separately Final model This document contains proprietary information of. and may not be

settings to each solid Adaptive Mesh Refinement Energy Based

6 Antenna performance (CST 2008) Calculation Settings: Open boundaries (Add Space) Energy criterion -40dB Specific mesh settings to each solid Adaptive Mesh Refinement Energy Based This document contains proprietary information of. and may not be

Modeling in CST 2009 Added new Bend Sheet feature (Objects -> Bend Sheet) Simple and straight forward Applies only for sheets and not solids Sheet must touch the face it

7 Modeling in CST 2009 Added new Bend Sheet feature (Objects -> Bend Sheet) Simple and straight forward Applies only for sheets and not solids Sheet must touch the face it bends on Objects -> Bend Sheet Duplicating the sheets, offsetting and lofting to realize conformal solids This document contains proprietary information of. and may not be

8 Antenna performance (CST 2009) Calculation Settings: Open boundaries (Add Space) Energy criterion -40dB Specific mesh settings to each solid Adaptive Mesh Refinement Energy Based This document contains proprietary information of. and may not be

9 Comparison of Results Identical radiation patterns Final no. of mesh cells after adaptive meshing in CST 2009 is slightly higher than in CST 2008 Almost identical S11 results CST 2008 CST 2009 CST 2008 CST 2009 This document contains proprietary information of. and may not be

10 Solver Time CST 2008 CST 2009 Computer Specs: CPU Type:DualCo re Intel Core 2 Duo E6600, 3433 MHz 4GB RAM Windows XP 64Bit Performance improvement is clearly noticed This document contains proprietary information of. and may not be

11 A more complex example Notches and other perturbations are often used for matching and band broadening A laborious task without the bending sheet feature This document contains proprietary information of. and may not be

Summary Construction of conformal antennas is easier now with the bend sheet feature It is possible to use complex sheets Getting the same accuracy as

12 Summary Construction of conformal antennas is easier now with the bend sheet feature It is possible to use complex sheets Getting the same accuracy as before Almost the same amount of mesh cells is generated Solver time is ~25% shorter This document contains proprietary information of. and may not be

13 Thank You This document contains proprietary information of. and may not be

Automotive Glass Antenna for Worldwide Cellular Phone Coverage

In cooperation with: Laboratorio Antenne e Microonde Automotive Glass Antenna for Worldwide Cellular Phone Coverage Author: M. Cerretelli, ASK Industries SpA & University of Florence (IT) Presenter: Simone