Vivaldi Antenna Arrays Application to Focal Plane Arrayrfisher/FAworkshop/Schaubert.pdfAntenna Lab...

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Vivaldi Antenna ArraysApplication to Focal Plane Array

Dan SchaubertAnatoliy Boryssenko

University of Massachusetts Amherst 413-545-2530

[email protected]

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Two Designs for THEA

Substrate Thickness = 3.15 mm Substrate Thickness = 1.6 mm

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THEA Demonstration

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Element Configurations

Metallic Fins

Ground Plane

Dielectric

Stripline Feed

Metallic Fin

Microstrip Feed

Dielectric

E

Ground Plane

E

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Tapered Slot Antenna Array Simulation

Time Domain

Frequency Domain

Infinite Arrays

Semi-Infinite Arrays

Elements and Finite Arrays

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UMass TDIE MoM-MOT code

1 2

3 4

5 6

7 8

8

16

64

48

56

40

32

24

5x1 TSA Array

8x8 TSA Array

References:[1] A. O. Boryssenko, Phased-array workshop, Eindhoven, June 11 2001. [2] A. O. Boryssenko, D. H. Schaubert, Predicted Performance of Small Arrays of Dielectric-Free Tapered Slot Antennas, in: Antenna App. Symp. Digest (Monticello, IL, 2001), pp. 250-279.[3] --, Time-Domain Integral-Equation-Based Solver for Transient and Broadband Problems in Electromagnetics, Presented at AMEREM 2002 Conf., To be published in UWB-6,(Annapolis, MR, 2002), pp. 1-11.

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Vias Suppress Dielectric Region Resonance

Without ViasExample – Three Scan Angles

With Vias

H-Plane Scan

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Element Pattern in Infinite Phased ArrayDielectric-Free Antenna

Active Gain - 0.8 GHz

-20

-15

-10

-5

0

0 15 30 45 60 75 90

Theta

Rel

ativ

e dB G(0)

G(45)G(90) G(90)


-20

-15

-10

-5

0

0 15 30 45 60 75 90

Theta

Rla

tive

dB G(0)G(45)

e


-20

-15

-10

-5

0

0 15 30 45 60 75 90

ThetaR

elat

ive

dB G(0)G(45)G(90)


-20

-14

-8

-2

4

0 15 30 45 60 75 90

Theta

Rel

ativ

e dB G(0)

G(45)G(90)

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Element Pattern in Infinite Phased Arrayεr = 2

Active Element Gain - 1.7 GHz

-20

-15

-10

-5

0

0 15 30 45 60 75 90

Theta

dB

Phi=0Phi=45Phi=90


-20

-15

-10

-5

0

0 15 30 45 60 75 90

Theta

dB

Phi=0Phi=45Phi=90


-20

-15

-10

-5

0

0 15 30 45 60 75 90

ThetadB

Phi=0Phi=45Phi=90


-20

-15

-10

-5

0

0 15 30 45 60 75 90

Theta

dB

Phi=0Phi=45Phi=90

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Spin Linear Radiation Patterns

H-PlaneE-Plane D-Plane

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Configurations for Dual Polarization

On sides of box - phase centers not coincident

Crossed at corners of box - difficult to feed at back of slot

Pair of slots forms element - reduced bandwidth and potential anomalies

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Circular Polarization Performance with Imperfect Elements

Element Patterns CP Patterns with Amp + Phase Control

This antenna is not optimized for performance

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Wideband Scan Range

E-Plane H-Plane

This antenna is not optimized for performance

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THEA Prototype Array

• Designed and fabricated at UMass Antenna Lab, 1999

• 1 - 5 GHz

• Approx 25cm x 25cm x 10cm

• Measured central element patterns and S parameters

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Central Element Patterns - 2.8 GHz

E-Plane H-Plane

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E-Plane H-Plane

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Central Element Patterns - D-Plane

3.6 GHz 5.4 GHz

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Central Element Gain

Broadside

500 E-Plane 500 H-Plane

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8-by-Infinite Element Patterns

From Craeye, Boryssenko and Schaubert, ICAP 03

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Mutual Coupling to Central Element – 3 GHz

Co-Polarized Cross-Polarized

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H-Plane Coupling Magnitude

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8x8 phased TSA array: geometry & mesh

0 0.1 0.2 0.3 0

0.1

0.2

0.3

0.4

0.5

0.6

m

m

1 2

3 4

5 6

7 8

8

16

64

48

56

40

32

24

704 triangles & 916 RWG modes

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8x8 phased TSA array: 10:1 band VSWR

Broadside beam

45-deg diagonal plane scanning

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8-by-Infinite Array Impedance

Active impedances for broadside scan

From Craeye, Boryssenko and Schaubert, ICAP 03

Infinite in H-plane

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Self Admittances for 6x6 Array

Isolated Element

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Mutual Admittance for 6x6 Array

Isolated Element

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Radiation Patterns of Small Arrays - 0.8 GHz

Antenna Performance has not been optimized

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Variation with Opening Rate

εr = 4 εr = 1

eRaz

D=32 cm

Dsl=2 cmRa = 0.1, 0.2 0.3

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Variation with Antenna Depth

e0.1z

D=24, 32 40 cm

Dsl=2 cm

εr = 4 εr = 1

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Variation with Cavity Size

e0.1z

D=40 cm

Dsl=1.5, 2, 2.5 cm

εr = 4 εr = 1

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Summary

Can treat many cases of interest with existing analysis / simulation tools

Large arrays extensively studied - reasonable level of understanding

Small finite arrays - some study and understanding

Focal plane imaging behavior - very little study

Vivaldi Antenna Arrays Application to Focal Plane Arrayrfisher/FAworkshop/Schaubert.pdfAntenna Lab...

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