Research activity of the Antenna Group at the Public University of Navarra

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1 Research activity of the Antenna Group at the Public University of Navarra Iñigo Ederra CST Workshop, Pamplona 2010/09/22 Antenna Group Created in 1999 Formed by: 6 Ph.D. 5 Ph.D. students 3 Researchers Collaborations with: 1

2 Research activity Horn antennas EBG resonator antennas Planar antennas on high ε substrates MTM Superstrates MTM for RCS reduction Imaging cameras EBG based THz receivers CORPS Ferromagnetic microwires Horn antennas Gaussian profiled horn antennas The Gaussian profile is defined by the free space propagation formula of a fundamental Gaussian beam High control of the radiation pattern ϖ ( z) = ϖ kϖ z ( z) = r kϖ 0 r 2 2z 2

3 Horn antennas Horn antennas that combine horizontal and vertical corrugations Discovered in 2002, Internationally patented technology Profiles combine two technologies: Horizontal or axial corrugations for throat region Vertical corrugations for flare region Main advantages: Shorter profiles, Easier manufacture processing Superb Gaussian beam efficiencies + IC Horn Astra 3B Horn antennas Very short profiles for a reasonable bandwidth and high performance This technology has been selected for: Satellite on board horn antennas Hispasat 1E and AG1 Amazonas 2 and 3 Horn antennas that combine horizontal and vertical corrugations Astra 3B Water Vapour radiometers Bern University, FZK, INGV, NRL Radio telescopes C band horn antenna (CAY) Conical corrugated horn 22 db directivity H & V corrugated horn 22 db directivity 3

4 Horn antennas Horn antennas that combine horizontal and vertical corrugations Horn antenna for water vapor radiometer at NRL, Washington Simulated and measured radiation patterns GHz GHz GHz S 11 and max. Crosspolarization simulated and measured results EBG resonator antennas EBG resonator to create high directivity 4 patches instead of 9 helixes Results comply with the specs. of the WAAS application Low mass solution Simpler feeding network Measured, Cut Phi= 0 deg. Predicted, Cut Phi= 0 deg. Specification Measured, Cut Phi= 0 deg. Predicted, Cut Phi= 0 deg. Directivity RHCP [dbi] Axial Ratio [db] Specification Elevation [deg] Elevation [deg] 4

5 Planar antennas on EBG high ε substrates ZZT substrate (ε=37) EBG structure eliminates substrate modes Arrays: no scan blindness MTM superstrates (Metasurfaces) Combination of wires an cut wires Pass band behaviour Metasurface Enhanced gain Dipole + Metasurface 5

6 MTM superstrates (Metasurfaces) Mutual coupling reduction Multi-frequency systems MTM for RCS reduction Chessboard structure Combination of AMC and PEC cells No specular reflection Low profile solution for RCS reduction Mushroom Monostatic RCS reduction on boresight, Landscape orientation RCS reduction [GHz] Chess PEC H-pol V-pol ,00 15,10 15,20 15,30 15,40 15,50 15,60 15,70 15,80 15,90 16,00 Frequency [GHz] 6

7 MTM for RCS reduction Dualband extension PEC -> AMC (working at different frequency) Possibility of broadband operation PEC Cells + AMC Cells Working frecuencies 0 AMC 1 Cells + AMC 2 Cells -5 Chessboard Metallic Plate Bistatic RCS [db] º at GHz 0º at 16.5 GHz Frequency [GHz] COherently Radiating Periodic Structures (CORPS) Based on the controlled coupling between antennas BFN for multibeam systems can be simplified 7

8 Glass-coated amorphous microwires Natural ferromagnetic resonance Scattering models have been developed Use in absorbers μ jk 0 μ = jk μ μ o σ ε = ε o j w Characterization in rectangular waveguide Analytical model Measurements Magnitude (db) R T A Magnitude (db) R T A Frequency (GHz) Frequency (GHz) EBG based THz heterodyne receivers Imaging array EBG material used as antenna substrate Higher directivity Reduced coupling Array of 7 dipoles (500 GHz) Performance at 500 GHz 8

9 EBG based THz heterodyne receivers Subharmonic mixer (250 GHz) Combines EBG + conventional Subharmonic mixer Possibility to use EBG substrate to inject LO signal Waveguides, cavities and horns are required RF RF LO input cavity LO RF cavity cavity LO EBG based THz heterodyne receivers EBG cavities EBG waveguide EBG antennas EBG waveguide EBG horn antennas 9

10 EBG based THz heterodyne receivers EBG based front end design Array of 4 subharmonic mixers Subharmonic LO injection Array elements separated E-Plane: 3 per. (1.5λ 0 ) H-Plane: 2 per. (λ 0 ) Imaging cameras QO system design Subharmonic mixer design 10

11 Imaging cameras THz material/substances characterisation Different materials/substances are being characterized in the THz range (f < 3.4 THz) Transmission/reflection analysis Applications: Food industry Viticulture Drying process of a leaf Facilities at UPNA Manufacturing LPFK Protolaser 200 Laser milling machine Spot size: 25 um TPT HB16 Thermosonic Wire Bonding Die Placing Disco DaD312 High precision cut machine 11

12 Facilities at UPNA Characterization Agilent PNA E8361C Teraview Spectra GHz OML Heads: & GHz THz More info. 12