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Design of a concept Planar Array for
the Biomass Space Mission
Relatore:
Prof. Gaetano Marrocco
Guido Casati
Correlatore:
...
BIOMASS Mission

Earth Explorer 7 Mission

Biomass Mapping

Enhancement of carbon cycle model

P-band (435 MHz)

SAR ...

Operating Frequency: 435 MHz (λ=69 cm) Dual-Pol

Bandwidth: 10 MHz (2.3 %)

About 4 m diameter to get required RCS

H...
Process Flow
Prototyping:
Measurements
Advanced array:
Enhancement of the radiating element
Enhancement of the array desig...

61 dual polarised Sub-Array

4 linearly polarised elements per Sub-Array

244 linearly polarised radiating elements

...

fo = 435 MHz

L = λo4

Do = 3 dBi

B(Γ=-10dB) = 4.5 %
Preliminary design: PIFA
Planar Inverted-F Antenna
ADF-EMS/3DAM...
Preliminary design: PIFA
sub-array
ADF-EMS/3DAM
L=166 mm,
W=172 mm
h = 20 mm
Preliminary design: Array

Spacing: 535 mm (~480mm)

Diameter: >5m (~4 m)

SL < -40 dB at the horizon (<-45dB)

XPD > ...
Improvement of performance
Critical points:

Radiation Pattern

Coupling among active and passive elements

Spacing

A...
Advanced Design: Folded PIFA
λ/8λ/4
from “Development and Analysis of a Folded
Shorted-Patch Antenna With Reduced Size”
di...
Do = 4 dBi
Advanced Design: Folded PIFA

L = W = 86 mm, h = 22 mm

Lg = Wg = 220 mm

Inductive Zin (Xin>0)

Γ = -17 dB...

Tukey Illumination Law with 5% tapering

Spacing: 480 mm

Diameter of Sub-array: 330 mm

Overall Diameter: 4.16 m (~4...

SL < - 45 dB ( < 45 dB )

XPD > 45 dB ( > 40 dB )

Do = 23 dBi

BW3db = 13°

B(Γ = -20 dB)= 3 MHz
Advanced Design: A...

91 sub-array (364 radiating elements)

Diameter: 5 m (~4 m)

Tukey Illumination Law with
2.5 % tapering (9 levels, DR=...
Optimisations: spacing
d=440 mm d=480 mm
θ=90°
Optimum for d=440 mm
Analytically:

Copper patch (height 0.25 mm)

Copper ground plane filled with duroid (height 2 mm)

Copper pin (diameter 2 mm) welded...

ESTEC's CATR: 4 – 110 GHz

300 – 500 MHz, 250 KHz step

Γ = -13 dB a f = 411 MHz

StarLab: Γ = -19 dB a f = 417.5 MHz...
Sensitivity analysis
Tilt angle

High sensitivity to small changes of
the tilt angle of the patches
+
-
+
-
Lower patch
U...

MVI's StarLab: 800 MHz - 18 GHz

NF / FF method

Do = 4.3 dBi, Go = 3.9 dB (e=98.7%)

BW = 120° (H-cut) / 110° (E-cut...
Outcome:

Design of a Planar Array that meet the requirements.

Data about several assessed layouts

Design and prototy...
THANK YOU FOR YOUR ATTENTION.
Info: Guido.casati89 [at] gmail.com
Q&A
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Design of a concept Planar Array for the Biomass Space Mission

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Presentation for the final discussion of my MSc thesis focused on the "Design of a concept Planar Array for the Biomass Space Mission".

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Design of a concept Planar Array for the Biomass Space Mission

  1. 1. Design of a concept Planar Array for the Biomass Space Mission Relatore: Prof. Gaetano Marrocco Guido Casati Correlatore: Ing. Marco Sabbadini
  2. 2. BIOMASS Mission  Earth Explorer 7 Mission  Biomass Mapping  Enhancement of carbon cycle model  P-band (435 MHz)  SAR quad-POL (HH, VV, VH, HV)  External calibration through active ground Transponder
  3. 3.  Operating Frequency: 435 MHz (λ=69 cm) Dual-Pol  Bandwidth: 10 MHz (2.3 %)  About 4 m diameter to get required RCS  High Directivity: ~25 dBi Broadside  Very low Back-Radiation and Side Lobe levels: SL< -45 dB  Negligible Cross-Talk: XPD > 40 dB Calibration Transponder Requirements of a concept Planar Array Solution: Planar Array Geometry: Hexagonal Spacing: 0.48 m Illumination law: Tukey
  4. 4. Process Flow Prototyping: Measurements Advanced array: Enhancement of the radiating element Enhancement of the array design Preliminary Design Design and assessment of the radiating element Performance of different array layouts
  5. 5.  61 dual polarised Sub-Array  4 linearly polarised elements per Sub-Array  244 linearly polarised radiating elements  7 excitation levels, 26 dB dynamic range Preliminary Design Central area: Uniform Illumination Tukey Illumination Law 5% tapering
  6. 6.  fo = 435 MHz  L = λo4  Do = 3 dBi  B(Γ=-10dB) = 4.5 % Preliminary design: PIFA Planar Inverted-F Antenna ADF-EMS/3DAM h L z yx PEC w
  7. 7. Preliminary design: PIFA sub-array ADF-EMS/3DAM L=166 mm, W=172 mm h = 20 mm
  8. 8. Preliminary design: Array  Spacing: 535 mm (~480mm)  Diameter: >5m (~4 m)  SL < -40 dB at the horizon (<-45dB)  XPD > 25 dB (>40dB) SL SL
  9. 9. Improvement of performance Critical points:  Radiation Pattern  Coupling among active and passive elements  Spacing  Array size Solution:  Reduce the volume of the Radiating Element
  10. 10. Advanced Design: Folded PIFA λ/8λ/4 from “Development and Analysis of a Folded Shorted-Patch Antenna With Reduced Size” di M. M. Tentzeris
  11. 11. Do = 4 dBi Advanced Design: Folded PIFA  L = W = 86 mm, h = 22 mm  Lg = Wg = 220 mm  Inductive Zin (Xin>0)  Γ = -17 dB  B(Γ=-10dB) = 6.5 MHz (1.5 %)
  12. 12.  Tukey Illumination Law with 5% tapering  Spacing: 480 mm  Diameter of Sub-array: 330 mm  Overall Diameter: 4.16 m (~4 m) Advanced Design: Array x y
  13. 13.  SL < - 45 dB ( < 45 dB )  XPD > 45 dB ( > 40 dB )  Do = 23 dBi  BW3db = 13°  B(Γ = -20 dB)= 3 MHz Advanced Design: Array V-POL H-POL
  14. 14.  91 sub-array (364 radiating elements)  Diameter: 5 m (~4 m)  Tukey Illumination Law with 2.5 % tapering (9 levels, DR=32 dB)  Do = 25 dBi  SL < -55 dB (<-45 dB)  XPD > 50 dB (>40 dB) Optimisations: 5 Rings Array
  15. 15. Optimisations: spacing d=440 mm d=480 mm θ=90° Optimum for d=440 mm Analytically:
  16. 16.  Copper patch (height 0.25 mm)  Copper ground plane filled with duroid (height 2 mm)  Copper pin (diameter 2 mm) welded to SMA connector Prototyping
  17. 17.  ESTEC's CATR: 4 – 110 GHz  300 – 500 MHz, 250 KHz step  Γ = -13 dB a f = 411 MHz  StarLab: Γ = -19 dB a f = 417.5 MHz  B(Γ = -10 dB) = 7 MHz Measurements: Return Loss IFFT Filtering FFT
  18. 18. Sensitivity analysis Tilt angle  High sensitivity to small changes of the tilt angle of the patches + - + - Lower patch Upper patch
  19. 19.  MVI's StarLab: 800 MHz - 18 GHz  NF / FF method  Do = 4.3 dBi, Go = 3.9 dB (e=98.7%)  BW = 120° (H-cut) / 110° (E-cut) Measurements: radiation pattern Directivity H-Cut E-Cut
  20. 20. Outcome:  Design of a Planar Array that meet the requirements.  Data about several assessed layouts  Design and prototype of a miniaturised radiating element Critical points:  Sensitivity of the radiating element  Bandwidth  Complexity of the feeding network Evolution:  Array-Metasurface solution Conclusions
  21. 21. THANK YOU FOR YOUR ATTENTION. Info: Guido.casati89 [at] gmail.com Q&A

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