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SWAN ™ - A fast and accurate CAD tool for slotted waveguide arrays www.swan-soft.com.

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Presentation on theme: "SWAN ™ - A fast and accurate CAD tool for slotted waveguide arrays www.swan-soft.com."— Presentation transcript:

1 SWAN ™ - A fast and accurate CAD tool for slotted waveguide arrays

2 Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions Outline

3 Slotted waveguide arrays: - radar systems - communication systems - mobile satellite terminals - satellite broadcast/coverage Dielectric-filled waveguides 0 /2 Wide scanning angle in the plane x-y x y Typical dimensions: hundreds of slots Full-wave methods not suitable for design ( Complex excitation is necessary ) Footprint pattern Introduction

4 Design of large arrays made of hundreds or thousands of radiating elements Computation unaffordable by any full-wave simulator Equivalent circuit of the radiating element extracted with an accurate full-wave analysis Mutual couplings lumped in the model using the “active impedance” concept Simplified approach based on:Introduction Fast and accurate analysis and design of large arrays Final test with full-wave CST simulation is possible

5 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

6 SWAN ™ is a new CAD tool for the design and analysis of large slotted waveguide arrays (thousands of slots). Its main features are: User-friendly intuitive graphical interface Customizable waveguide dimensions Dielectric filling of the waveguides Resonant and traveling wave slotted waveguide arrays Mutual coupling and wedge diffraction effects considered Dielectric and metal losses considered Beam-scanning arrays analysis and design Shaped beam synthesis (complex excitation coefficients) Feeding network and input transitions can be considered SWAN ™ Software

7 s l Y(s,l,f) Z(s,l,f) Wide band rigorous equivalent model, computed with a full-wave analysis in order to account for a number of details: dielectric filling of the waveguide, waveguide wall thickness, rounded edge of the slot, presence of a radome, etc. Design and analysis make use of this equivalent circuit, rigorously taking into account slot mutual couplings by means of the active impedance concept. l/ 0 s/a Real(Y) l/ 0 s/a Imag(Y) l/ 0 s/a Imag(Z) SWAN ™ Software: Slot Model

8 Active slot admittance Includes mutual coupling effects Equivalent circuit of the slotted WG d … d short short circuit

9 The “Active Impedance” concept “Active” slot impedance: Isolated slot Mutual coupling term Impedance matrix of the array Mutual impedance Self impedance

10 Antenna requirements Slotted waveguide array design DESIGN MODULE Slotted waveguide array analysis ANALYSIS MODULE Slot model extraction SLOT MODULE SWAN ™ Software workflow

11 SWAN ™ Software: The GUI Design ModuleAnalysis Module COMPUTATION PARAMETERS EXPORT LAYOUT (DXF) DESIGN PARAMETERS SLOT PARAMETERS FEEDING CONFIGURATIONS ANALYSIS PARAMETERS

12 SWAN ™ – CST Integration SLOT MODULE SINGLE SLOT CST SIMULATIONS SLOT MODULE EXTRACTION DESIGN MODULE DXF EXPORT FINAL CST ANALYSIS

13 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

14 Ku-band slotted WG phased array Ku-band slotted SIW phased array Beam Steering Slotted Waveguide Arrays for Ku-Band Satellite Communications Fast Design & Best Performance

15 Beam Steering Slotted Waveguide Arrays for Ku-Band Satellite Communications Received signal power spectrum from 11 to 12 GHz when the antenna is pointed at Eutelsat Hot Bird 13E Receiving slotted SIW array made of 32×32 slots, approx. size 40×80×3 cm

16 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

17 SLR H =-28dB Low Side Lobe Slotted Waveguide Arrays low side lobe X-band slotted wg array -10 dB > 520 MHz Accurate Synthesys & Short Time to Market

18 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

19 SWAN ™ – CPU time ( 2.5 GHz ) Design = 48 sec Analysis = 21 sec/freq. point Ampl. Phase H-plane / degrees Gain (dB) - f = 9.4 GHz 97.5 cm 25.4 cm WG Matched Load  Array 10  36 traveling wave  f 0 = 9.4 GHz  Taylor excitation Array for Radar X-band Fully Automated Optimization

20 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

21 Large Arrays Beam Shaping (Complex Excitation) Amplitude Phase H-Plane excitation 12  24 slots planar array on WR90 H-plane: Cosec 2 Pattern (90°  115°) E-plane: Taylor Pattern SLR = -35 dB Frequency / GHz |S 11 | (dB) - all subarrays = 470 MHz (5 %) H-plane / degrees Gain (dB) - f = GHz Shaped beam in the H-Plane E-plane / degrees Gain (dB) - f = GHz Low Side Lobes in the E-Plane SWAN ™ – CPU time ( 2.5 GHz ) Design = 93 sec Analysis = 15 sec/freq. point Satisfying your requirements

22 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

23 Monopulse Antenna Key Elements  4-quadrant slotted waveguide array (SWAN)  Single quadrant waveguide BFN (SWAN)  Magic T (or hybrid coupler) (CST)  T-junction (CST)  Waveguide bends (CST)

24 BFN Schematic Matched Load A+CB+D A-CB-D Δ el Δ az Σ

25 Σ ΔEΔE Final Layout ΔHΔH

26 Sigma

27 Delta E-plane

28 Delta H-plane

29 Design Example Using CST

30 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

31 Arbitrary Subarray Geometry (1) NEW FEATURE!

32 Arbitrary Subarray Geometry (2)

33 Arbitrary Subarray Geometry (3)

34 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

35 SLR H =-28dB Comparison with CST MWS (1) -10 dB > 520 MHz Very good agreement with Full-Wave simulator CST MWS

36  Cosec 2 radiation pattern  16-slots linear array on WR90 CST -45dB 30° Comparison with CST MWS (2)

37  18-slots linear array on WR90  Extremely low sidelobes (-35dB)  Beam shaping (deep nulls) SLR=35dB Deep null region Comparison with CST MWS (3)

38 Comparison with CST MWS (4)

39 Outline Introduction The software SWAN ™ : main features Slotted waveguide antennas design examples: Beam Steering Array Low Side Lobe Fixed Beam Array Traveling Wave Array Shaped Beam Synthesis Monopulse Antenna Design & Analysis Arbitrary Subarray Geometry Comparisons with CST MWS Conclusions

40 SWAN ™ - The best choice for Slotted Waveguide Arrays SWAN ™ is fast, as it makes use of a rigorous equivalent circuit for the single slot obtained with an accurate full-wave analysis. The design and analysis of large arrays with thousands of slots can be easily carried out. SWAN ™ is accurate, as mutual coupling effects and their dependence on frequency and scanning angle as well as dielectric and metal losses are rigorously taken into account. Feeding network and input transitions can also be considered. SWAN ™ is flexible, as it allows for customizable waveguide dimensions, dielectric filling of the waveguides, many different feeding configurations, beam scanning optimizations, shaped beam synthesis, etc.

41 References [1] R. Vincenti Gatti, R. Sorrentino, P. Mezzanotte, L. Roselli and F. Alimenti, “Accurate design of Ka-band flat scanning antennas for mobile satellite terminals,” 31 st EuMC, European Microwave Conference, London, England, Sept [2] R. Vincenti Gatti, R. Sorrentino, M. Dionigi, “Equivalent circuit of radiating longitudinal slots in dielectric filled rectangular waveguides obtained with FDTD method,” IEEE MTT-S, International Microwave Symposium, Seattle, Washington, USA, 2-7 June 2002, vol. 2, pp [3] R. Vincenti Gatti, R. Sorrentino, “A Ka-band active scanning array for mobile satellite terminals using slotted waveguide technology,“ 25th ESA Antenna Workshop on Satellite Antenna Technology, ESTEC, Noordwijk, The Netherlands, Sept [4] R. Vincenti Gatti, R. Sorrentino, M. Dionigi, “Fast and accurate analysis of scanning slotted waveguide arrays,” 32 nd EuMC, European Microwave Conference, Milan, Italy, Sept [5] R. Sorrentino, R. Vincenti Gatti, “Design of low-cost flat-profile active scanning antennas for mobile satellite terminals in Ka-band,” Invited paper at MMS’2003, Mediterranean Microwave Symposium, Cairo, Egypt, 6-8 May [6] R. Vincenti Gatti, R. Sorrentino, “Low-cost flat-profile active scanning antenna for mobile satellite terminals in Ka-band,” 3rd ESA Workshop on Millimetre Wave Technology and Applications, Espoo, Finland, May [7] R. Vincenti Gatti, R. Sorrentino, M. Dionigi, “Low cost active scanning antenna for mobile satellite terminals,” IEEE AP-S, International Symposium on Antennas and Propagation 2003, Columbus, Ohio, USA, June [8] R. Vincenti Gatti, L. Marcaccioli, R. Sorrentino, “A novel phase-only method for shaped beam synthesis and adaptive nulling,” 33 rd EuMC, European Microwave Conference, Munich, Germany, 6-10 Oct [9] L. Marcaccioli, R. Vincenti Gatti, R. Sorrentino, “Series expansion method for phase-only shaped beam synthesis and adaptive nulling,” URSI 2004, International Symposium on Electromagnetic Theory, Pisa, Italy, May [10] R. Vincenti Gatti, R. Sorrentino, “Shaped beam synthesis method for slotted waveguide arrays,” MMS’2004, Mediterranean Microwave Symposium, Marseille, France, 1-3 June [11] R. Vincenti Gatti, L. Marcaccioli, R. Sorrentino, “Design of slotted waveguide arrays with arbitrary complex slot voltage distribution,” IEEE AP-S, International Symposium on Antennas and Propagation 2004, Monterey, California, USA, Jun [12] R. Sorrentino, R. Vincenti Gatti, “Slotted waveguide active phased arrays for mobile satellite terminals,” Invited paper at ISSSE 2004, International Symposium on Signals, Systems and Electronics, Linz, Austria, Aug [13] R. Vincenti Gatti, R. Sorrentino, “A fast and accurate CAD tool for slotted waveguide arrays for radar applications,” 1 st EuRAD, European Radar Conference, Amsterdam, The Netherlands, Oct [14] R. Vincenti Gatti, R. Sorrentino, “Slotted waveguide antennas with arbitrary radiation pattern,” 34 th EuMC, European Microwave Conference, Amsterdam, The Netherlands, Oct [15] D. Trincia, L. Marcaccioli, R. Vincenti Gatti, R. Sorrentino, “Modified projection method for array pattern synthesis,” 34 th EuMC, European Microwave Conference, Amsterdam, The Netherlands, Oct [16] R. Vincenti Gatti, R. Sorrentino, “A fast and accurate CAD tool for slotted waveguide arrays,“ 28th ESA Antenna Workshop on Satellite Antenna Technology, ESTEC, Noordwijk, The Netherlands, 31 May - 3 June [17] R. Vincenti Gatti, R. Sorrentino, V. Schena, G. Losquadro, “Flat-profile active scanning antenna for satellite terminals in Ku-band operating on new fast trains generation,“ 28th ESA Antenna Workshop on Satellite Antenna Technology, ESTEC, Noordwijk, The Netherlands, 31 May - 3 June [18] R. Sorrentino, R. Vincenti Gatti, “Slotted waveguide active phased arrays for mobile satellite terminals,” Invited paper at MRRS 2005, International Workshop on Microwaves, Radar and Remote Sensing, Kiev, Ukraine, Sept [19] R. Vincenti Gatti, L. Marcaccioli, E. Sbarra and R. Sorrentino, “Flat Array Antennas for Ku-Band Mobile Satellite Terminals,” 30th ESA Antenna Workshop on Antennas for Earth Observation, Science, Telecommunications and Navigation Space Missions, ESA/ESTEC Noordwijk, The Netherlands, May [20] R. Vincenti Gatti, R. Sorrentino, “A Fast and Accurate CAD Tool for Slotted Waveguide Arrays,” IEEE COMCAS 2009, Tel Aviv, Israel, 9-11 Nov [21] R. Vincenti Gatti, L. Marcaccioli, E. Sbarra, R. Sorrentino, “Flat Array Antenna for Ku-band Mobile Satellite Terminals”, European Conference on Antennas and Propagation 2011, April 2011, Rome. [22] R. Vincenti Gatti, S. Calzuola, R. Sorrentino, “Compact Short Circuit for Slotted Waveguide Array BFNs”, 41 st EuMC, European Microwave Conference, Manchester, UK, 9-14 Oct [23]

42 SWAN SWAN Copyright  2012 Roberto Vincenti Gatti. All Rights Reserved. S lotted W aveguide AN tennas™ ANALYSIS AND DESIGN ANALYSIS AND DESIGN


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