FIDA3 ( F G- I GN D ifferential A ctive A ntenna A rray) Luis - - PowerPoint PPT Presentation

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FIDA3 ( F G- I GN D ifferential A ctive A ntenna A rray) Luis - - PowerPoint PPT Presentation

May 26, 2023 201 likes •446 views

FIDA3 ( F G- I GN D ifferential A ctive A ntenna A rray) Luis Enrique Garca-Muoz, Vicente Gonzlez-Posadas, Jos Antonio Lpez-Fernndez 1 , Daniel Segovia-Vargas Departamento de Teora de la Seal y Comunicaciones Universidad Carlos

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SLIDE 1

FIDA3 (FG-IGN Differential Active Antenna Array)

Luis Enrique García-Muñoz, Vicente González-Posadas, José Antonio López-Fernández1, Daniel Segovia-Vargas Departamento de Teoría de la Señal y Comunicaciones Universidad Carlos III de Madrid (TSC-UC3M)

1Observatorio Astronómico Nacional

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SLIDE 2

FIDA3

State Of The Art

EMBRACE

Single ended technology (microstrip feeding

balun printed in a different board).

Single polarization (soon dual polarization). Elements Etched in FR4 substrate. Band: 300-1500 MHz. (-45º to 45º scan). 1 m2 tile = 64 antennas per polarization

(antenna pitch = 125 mm).

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SLIDE 3

FIDA3

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SLIDE 4

FIDA3

State Of The Art II

VALARRAY

Single ended technology (microstrip feeding

balun printed in a different board).

Dual polarization. Elements made in aluminum material. Band: 600-1500 MHz. (limited scan). 1 m2 tile* = 56 antennas per polarization

(antenna pitch = 118 mm - element spacing = 125 mm).

* 64 elements is feasible.

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SLIDE 5

FIDA3

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SLIDE 6

FIDA3

State Of The Art III

FLOWPAD3*

Differential technology. Dual polarization. Elements entirely built in one layer of a thin

substrate (polyester) and located in a polypropylene foam lattice.

Band: 300-1000 MHz. (-45º to 45º scan). 1 tile = 32 antennas per polarization (antenna

pitch = 165 mm). 1 m2 of array: 36.75 antennas per polarization.

* Simulated

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SLIDE 7

FIDA3

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SLIDE 8

FIDA3

FIDA3

<73.5? 73.5 128** 128 LNAs/m2

300-1000

  • MHz. (-45º to

45º scan)? 300-1000

  • MHz. (-45º to

45º scan)* 600-1500

  • MHz. (limited

scan). 300-1500

  • MHz. (-45º to

45º scan)

Band

  • Substrate?
  • Bridge
  • Extra board
  • Ground plane
  • Extra board
  • FR4 needed
  • Ground plane

Fabric. issues Diff. Diff. Single Single Tech.

FIDA3 FLOWPAD3 VALARRAY EMBRACE

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SLIDE 9

FIDA3

FIDA3

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SLIDE 10

FIDA3

FIDA3 antenna elements I

Bunny-Ears antenna

Pitch = 176 mm 64 LNAs/m2

0.2 0.4 0.6 0.8 1 1.2 1.4 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8

VSWR at Broadside for a 2 POL array of Bunny Ears

Freq [GHz] VSWR CST HFSS

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SLIDE 11

FIDA3

FIDA3 antenna elements II

Scanning results

0.2 0.4 0.6 0.8 1 1.2 1.4 1 2 3 4 5 6 7

Scanning a 2 POL array of Bunny Ears

Freq [GHz] VSWR H plane 45.8º E plane 45.8º H plane 22.9º E plane 22.9º

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SLIDE 12

FIDA3

FIDA3 WITH GND

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SLIDE 13

FIDA3

FIDA3 WITH GND

ODD MODE

  • NO SCAN BLINDNESS

EVEN MODE

  • SCAN BLINDNESS
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SLIDE 14

FIDA3

FIDA3 WITH GND

INTRODUCING RESISTORS IN AN ODD CONFIGURATION

  • EVEN CURRENTS ARE BEING REMOVED
  • ODD MODE IS STILL PRESENT
  • NO SCAN BLINDNESS
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SLIDE 15

FIDA3

FIDA3 WITH GND

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SLIDE 16

FIDA3

FIDA3 Preliminar Noise Study

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SLIDE 17

FIDA3

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 0.5 1 1.5 2 2.5 3 3.5 4 Freq [GHz] VSWR

R

FIDA3 Preliminar Noise Study

WARNING: INCREASING R, STRONG MISTMATCH APPEARS

  • COMPROMISE SOLUTION
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SLIDE 18

FIDA3

FIDA3 Final Design

H PLANE E PLANE

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SLIDE 19

FIDA3

FIDA3 feeding network I

Two

  • utputs

per tile (combining 8*8 elements for each polarization)

  • Only broadside
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SLIDE 20

FIDA3

‘Modular’

design

  • Subarrays inside the

tile

  • access to 16

subarrays

  • f

4 elements, 4 subarrays

  • f 4 elements and

also single output (all cases with two polarizations) Versatile and 2D scanning.

FIDA3 feeding network II

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SLIDE 21

FIDA3

Technology:

Coaxial

cables and commercial power splitters

Mixed feeding schemes:

microstrip technology & commercial elements Key aspects:

  • Bandwidth:
  • Commercial

power splitters

  • Wilkinson/T-

junction based solutions

  • Losses
  • Low noise

solution

FIDA3 feeding network III

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SLIDE 22

FIDA3

FIDA3 LNAs

Balanced DA

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SLIDE 23

FIDA3

FIDA3 CONCLUSIONS

64 73.5 128** 128 LNAs/m2

300-1000

  • MHz. (-45º to

45º scan) 300-1000

  • MHz. (-45º to

45º scan)* 600-1500

  • MHz. (limited

scan). 300-1500

  • MHz. (-45º to

45º scan)

Band

NO SUBSTRATE

  • Bridge
  • Extra board
  • Ground plane
  • Extra board
  • FR4 needed
  • Ground plane

Fabric. issues Diff. Diff. Single Single Tech.

FIDA3 FLOWPAD3 VALARRAY EMBRACE