ORTHOMODE TRANSDUCERS

Transcription

1 ORTHOMODE TRANSDUCERS & A POSSIBLE PLANAR SOLUTION FOR BOLOMETRIC INTERFEROMETRY Adnan GHRIBI Frederic Dauplayn, Frederique Gadot, Benoit Belier, Nathanael Bleurvacq, Mario Zannoni APC, IEF, LERMA, Univ. Bicocca

2 SUMMARY I. ORTHOMODE TRANSDUCER II. A POSSIBLE PLANAR SOLUTION 18/06/2008 2

3 OMT INTRODUCTION Return loss - GHz A. Navarrini and R.L. Plambeck, A Turnstile Junction Waveguide Orthomode Transducer, IEEE TMTT, vol 54, n. 1, Jan 2006; C. Groppi et al., Broadband Finline Orthomode Transducer for GHz Band, Proc. ISSTT, pp , /06/2008 3

4 OMT INTRODUCTION Engargiola and Plambeck 2003, Rev Sci Instr, 74, 1380 P. K. Grimes, O.G. King, G. Yassin,, M.E. Jones, Compact broadand planar orthomode transducer Electronic Letters, /06/2008 4

5 OMT SIMULATION PARAMETERS CST Microwave Studio Simulation parameters : Waveguide shape? Planar antenna shape Backshort Substrate? To be optimized 280µm Silcon + 2µm membrane(sio/si3n4/sio) 18/06/2008 5

6 OMT SIMULATION PARAMETERS CST Microwave Studio Simulation parameters : Waveguide shape? Planar antenna shape Backshort Substrate? To be optimized 280µm Silcon + 2µm membrane(sio/si3n4/sio) 18/06/2008 6

7 OMT SIMULATION PARAMETERS CST Microwave Studio Simulation parameters : Waveguide shape? Planar antenna shape Backshort Substrate? To be optimized 280µm Silcon + 2µm membrane(sio/si3n4/sio) Waveguide and antenna considered shapes Radial shape antenna seems to be the best one (according to optimisations) So let s compare the selected candidates 18/06/2008 7

8 S parameters OMT SIMULATION PARAMETERS Waveguide shapes Return loss Crosspolarization 18/06/2008 8

9 S parameters OMT SIMULATION PARAMETERS Waveguide shapes Without Return loss Crosspolarization With supporting membrane 18/06/2008 9

10 S parameters Transmitted Power S parameters OMT SIMULATION PARAMETERS Waveguide shapes Without Return loss Crosspolarization With supporting membrane Without Crosspolarization With supporting membrane 18/06/

11 S parameters Transmitted Power S parameters Transmitted Power OMT SIMULATION PARAMETERS Waveguide shapes SQUARE WAVEGUIDE WINS! Crosspolarization 18/06/

12 S parameters Transmitted Power OMT SIMULATION PARAMETERS Waveguide shapes SO : SQUARE WAVEGUIDE! And what about the circular to square transition? Crosspolarization 18/06/

13 Crosspolarization db Transmitted Power % OMT SIMULATION PARAMETERS Circular to square transition With Transition Without Transition Crosspolarization and transmitted power for a 5mm longsquare waveguide with 10mm circular to rectangular transition and 10mm long circular waveguide, and with 25mm long square waveguide. Si substrate (280µm), SiO/Si3N4/SiO membrane (2µm). 18/06/

14 Return loss db Crosspolarization db OMT SIMULATION PARAMETERS µstrip to SSL (3) (2) (1) -60dB Crosspolarization Return loss and crosspolarization for different microstrip to SSL transitions 18/06/

15 OMT SIMULATION PARAMETERS Finally! 18/06/2008 Transmitted power and crosspolarization simulated with CST MWS. 15

16 OMT BOLOMETRIC CHARACTERIZATION Very sensitive measurements (TES) Necessary for the last measurements but not as a first approach. We can not characterize in precise way Costly 18/06/

17 OMT VNA CHARACTERIZATION Stable and fast to do Not very costly Can be used to charachterize other components Not very sensitive measurements 18/06/

18 OMT Mechanical Structure CHARACTERIZATION STRUCTURE 30 cm Copper made structure 5 ports Circular waveguide input port 18/06/

19 OMT CHARACTERIZATION STRUCTURE Masks Benoit Belier IEF, Orsay Centale de technologie Minerve 18/06/

20 OMT CHARACTERIZATION Mechanical Structure WR10 Waveguide 18/06/

21 OMT CHARACTERIZATION Mechanical Structure Same electrical lengths as the OMT structure TRL cryogenic calibration Precise characterization of active and passive superconducting planar devices ( filters, phase shifters, couplers, 18/06/

22 OMT CRYOGENIC CHARACTERIZATION SETUP Use of an AGILENT MVNA. Cryogenic TRL calibration. Stable environment (1 day). Muliple windows for multiple measurements in the some environment. AND READY TO USE! Cryogenic characterization system, Radio group, University of Bicocca, Milano 18/06/

23 OMT CRYOGENIC CHARACTERIZATION SETUP WR10 Waveguides. FAST measurements. 4 waveguides cane being designed for simple baseline calibration. BUT Not very precise measurements. Not stable environment. Cryogenic cane, N. Bleurvack, Paris. 18/06/

24 A POSSIBLE PLANAR SOLUTION? Principle Horn Antennas Orthomode Transducers Phase shifters + filters Power combiner Bolometers Working principle of a planar architecture for additive bolometric interferometry. 18/06/

25 A POSSIBLE PLANAR SOLUTION? Layout 27 cm Full Power Combiner 4x4 Array Possible planar architecture for a 4x4 array. Horn array box, N. Bleurvack. 18/06/

26 A POSSIBLE PLANAR SOLUTION? Components OMT Filters Phase Shifters See Yassin s Revue Full power combiner What is it? Input Output 18/06/

27 A POSSIBLE PLANAR SOLUTION? Components - Full Power Combiner 3 Branches Hybrid Coupler Simulated S parameters phase and magnitude of a 3 branches hybrid coupler. Thèse C. Dall Omo, «Contribution à l étude d antennes à pointage électronique 18/06/2008 enmillimétrique, conception et réalisation de différentes matrices de Buttler». 27

28 A POSSIBLE PLANAR SOLUTION? Components - Full Power Combiner 0 db Coupler Transmission : -0.5 db Isolation : -35 db Simulated S parameters magnitude of a 0 db coupler. Thèse C. Dall Omo, «Contribution à l étude d antennes à pointage électronique en millimétrique, conception et réalisation de différentes matrices de Buttler. 18/06/

29 A POSSIBLE PLANAR SOLUTION? 4 Ports Combiner n ports combiner Parameters extraction Efficient phase shifting sequence (See Charlassier et al) 18/06/

30 A POSSIBLE PLANAR SOLUTION? REQUIREMENTS: Transmission > 90% Bandwidth > 30% Compacity, POSSIBLE SOLUTION : Bandwidth Enhancement and 0 propagation Planar Metamaterials can be a good Resonance, 0 phase propagation. 18/06/

31 A POSSIBLE PLANAR SOLUTION? Metamaterial Application Phase shifter The phase responses of one, four and eight-stage 0 phase shifting lines compared to a conventional transmission line at 0.9 GHz : the dashed line is the measured data; the solid line is from an agilent ADS simulation. Enabling RF/microwave devices using negative-refractive-index transmissionline (NRI-TL) metamaterials, Eleftheriades, G.V., Antenna and Propagation Magazine, IEEE, April /06/

32 A POSSIBLE PLANAR SOLUTION? Metamaterial Application Hybrid Coupler Measured and simulated isolation and coupled power with normal coupled lines and LHM transmission line. Enabling RF/microwave devices using negative-refractive-index transmission-line (NRI-TL) metamaterials, Eleftheriades, G.V., Antenna and Propagation Magazine, IEEE, April /06/

33 CONCLUSIONS OMT first tests sheduled for September The structure for the VNA cryogenic characterization will be ready in September Studies of Planar metamaterial structures in progress. Development of associated superconducting planar devices in progress. BSD Collaboration (B-mode Superconducting Detectors) See Michel Piat s talk. Full planar architectures can be a solution for future satellite missions but still have to gain maturity. Beyond cosmology, the challenging technology have it s own interest..and. National and international efforts are gathered but still need BRAINS and HANDS!!! 18/06/

34 Thank you 18/06/

35 THE REASONS Niobium is a good candidate 700 GHz Nb RF loss of microstrip lines made with several different materials. Low loss NbTiN films for Thz SIS mixer tuning circuits, Kooi et al, International Journal of Infrared and 18/06/2008 Millimeter Waves, Vol. 19, No. 3,

36 COLLABORATIONS B S D B-mode Superconducting Detectors APC Paris LERMA - Paris IEF Orsay L2E Evry CSNSM Orsay B R A I N / M B I B-mode Radiation Interferometer France (APC, CSNSM, CESR, IAS) Italy (Milano Bicocca, La Sapienza) UK USA Ireland 17/06/