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Design and Optimization of an Antenna using CST Microwave Studio and modeFRONTIER

Design and Optimization of an Antenna using CST Microwave Studio and modeFRONTIER

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Design and Optimization of an Antenna using CST Microwave Studio and modeFRONTIER

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  1. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Design and Optimization of an Antenna using CST Microwave Studio and modeFRONTIER ESTECO UM2010 , Trieste 27-28 May 2010 Y. Kaldor - Rafael, S. Poles, F. Bernasconi – EnginSoft , E. Leroux – CST 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 1

  2. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Overview The following slides describe the design process of a small antenna located on a large platform. The platform dimensions are : 13λ x 3λ x 3λ ( λ is the wavelength of the antenna) 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 2

  3. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Requirements The Antenna is required to perform over a 30% Frequency Bandwidth. Matching Specification – over the full Bandwidth: Return Loss : -8 dB max VSWR 2.2:1 max Difficulties Tight Space – therefore required small antenna dimensions The environmental conditions under which the antenna is required to perform are harsh. 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 3

  4. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. The Solution The antenna chosen as a solution is a combination of a Slot Antenna and Travelling Wave Antenna. The Antenna was modeled and simulated using CST Microwave Studio for return loss and radiation pattern performance. 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 4

  5. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Initial Simulation Results Matching over the full frequency range was nearly impossible due to dimension constraints and coupling from the platform Specification Optimization design Goal Simulated Return loss was initially very poor. Sufficient performance was obtained over 6% bandwidth only. 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 5

  6. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. The parameterized CST model Initially the parameters which mostly effect the matching performance were identified. r p h The CST model was regenerated using these parameters. H L Input port 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 6

  7. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. modeFRONTIER - Optimization Workflow Input Variables slot_length stub r_stub pin_dist partstub slot_h Design Objective Output Variables Design Constraint R_loss_f_low R_loss_f_cen R_loss_f_high Minimize(maximum) Maximum < -10 dB 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 7

  8. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. mF - Design Space Post Processing Bubble Chart 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 8

  9. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. mF - Design Space Post Processing Parallel Coordinate Chart 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 9

  10. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. modeFRONTIER - Design Space post processing charts The various post processing charts help us understand the physics of the problem. In this sense the design space charts are valuable decision making tools. The various charts depict the full design space, the history of the optimization an its progress towards the optimal solution Optimization using modeFRONTIER allows Robust Design 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 10

  11. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Before Optimization Return Loss and VSWR Performance Specification Optimization Goal Flow Fcenter Fhigh ohm 50 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 11

  12. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. After Optimization Return Loss and VSWR Performance Specification Optimization Goal Flow Fcenter Fhigh ohm 50 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 12

  13. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Summary and Results Return loss and VSWR performance were highly improved using the optimization process. 34% bandwidth was obtained!! The optimization process was automatic Few hundred runs were made, several times. 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 13

  14. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Summary and Results cont... The antenna was manufactured and measured. Results are presented on the next slide 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 14

  15. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Comparison of Measured vs. Simulated Return Loss Performance Specification Simulated Measured Flow Fcenter Fhigh 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 15

  16. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. The Next Step….. The next step is making a multidisciplinary optimization using modeFRONTIER The optimization model will include: – ProE node – Ansys node – CST node 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 16

  17. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. The Model….. 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 17

  18. unclassified Missiles & NCW Division R & D and Engineering Directorate ADVANCED DEFENCE SYSTEMS Ltd. Thank You 20 May 2010 RAF#3030180 UNC/8/30783/10 Proprietary of Rafael - Armament Development Authority Ltd 18

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