2-140 GHz CAY Anechoic Chamber - wettzell.ifag.de · Agilent PNA E8364 NSI doubler 20-40 GHz out...
Transcript of 2-140 GHz CAY Anechoic Chamber - wettzell.ifag.de · Agilent PNA E8364 NSI doubler 20-40 GHz out...
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CAY
2-140 GHz CAY Anechoic Chamber
F. Tercero, T. Finn, JM. Serna, JA. López-Fernandez
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
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CAY
Overview of CAY AUT
� Frequency Range� 2 GHz-116 GHz
� Waveguide components� Polarisers and OMT
� Horn type antennasSingle feed antenna at room temperature
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Single feed antenna at room temperature
� Feed systems� Horn+Reflector (or dielectric lenses)
� Horn (and lenses) inside of cryostats
� FSS
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CAY
Types of measurements
� Far Field patterns (co & xp)� standard antenna verification
� Near Field patterns� Gaussian Beam Mode Propagation in feed
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Gaussian Beam Mode Propagation in feed system
� Axial ratio� verification of polarisers and OMTs measured
in free space
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CAY
Are all these kind of antennas similar for the measuring system?
� Directivity
� Hardness of movement (mechanical complexity)� More electrical criteria (Rx/Tx, active/passive, frequency conversion)
Far Field Range Near Field Range
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
WG.COMP HORNS CRYOSTATS SYSTEMS
LOW DIRECTIVITY HIGH DIRECTIVITY
EASINESS OF MOVEMENT HARDNESS OF MOVEMENT
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CAY
Dual system: Near Planar + Far Spherical
� Cryostats, Systems & Directive Horns
� The probe scans the aperture field over a plane
� FF=FT(NF)� NF can be measured
directly at several distances from the AUT
Light systems or not very
AUT
PROBE (OEWG)
AUT
PROBE (SGH)
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Light systems or not very directive
� The AUT scans the “plane wave” from the SGH (fixed in the scanner)
� Classical FF Measurement at FF distance
� AUT Rx/Tx
AUT
(OEWG)
PROBE
(OEWG)
AUT
PROBE (SGH)
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CAY
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
Dual system: Dimensions� Inspiration � 40m=Cassegrain F/D=7.909
� w0=5.5*λ � Reflector D=22*λ in Cass. Focus
� Planar scanner� f=2 GHz (λ=150mm) D=3300mm� f=5 GHz (λ= 60mm) D=1320mm� Little bit bigger than D of reflector needed
� Z-axis railway� NF measurements up to the confocal distance
(zc=5.52.λ.п)
θ
AU
T A
pert
ure
Sca
n A
rea
1.8 m
� NF measurements up to the confocal distance (zc=5.52.λ.п)
� f=2 GHz (λ=150mm) zc=14000mm� f=5 GHz (λ= 60mm) zc= 5700mm
� Far spherical� FF measurements at 2*D2/λ distance for a 8λ
(≈25 dBi directivity)� f=2 GHz (λ=150mm) R=19200mm� f=5 GHz (λ= 60mm) R= 7600mm
� Range dimensions� 7400 mm LENGTH (AUT to SGH)� 4300 mm WIDTH & HEIGHT (absorbers)
2Φr 2Φv
AU
T A
pert
ure
Sca
n A
rea
4.3 m
5.4 m
7.4 m
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CAY
Planar Scanner
� Construction Inverted “T” Frame (steel)� Scan Area 6’x6’ (1.8 m x 1.8 m)� Corrected Planarity 0.001” (0.025 mm) RMS� Resolution (x,y) 0.001” (0.025 mm)� Position Repeatability 0.002” (0.05 mm) RMS� (W, D, H) 3.1m, 1.7m, 3.3m
Polarisation stage (360º probe rotator)
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Polarisation stage (360º probe rotator)
� Measurement of the planarity during the on-site installation and corrected actively
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CAY
Spherical Positioner
� Construction Phi over Theta rotation stages with “L” bracket (aluminium)
� Scan Area Full spherical; Phi/Theta - 360°
� Maximum Antenna Load 20 kg at 22 cm CG offset
� Resolution 0.0125° phi and theta
� Position Repeatability 0.03°
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Position Repeatability 0.03°
� Rotational Speed (Theta and Phi) 20°/sec
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CAY
RF Instrumentation� f<50 GHz
� Agilent PNA E8364� NSI doubler 20-40 GHz out� NSI quadrupler 33-50 GHz out
� Agilent mixers 2-50GHz 85320A/B-H50
� f>50 GHzAgilent PNA E8364
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Agilent PNA E8364� 50-75 GHz WR15 OML Millimetre Head� 75-110 GHz WR10 OML Millimetre Head� 90-140 GHz WR08 OML Millimetre Head
� RF Instrumentation (PNA+mmHeads) shared for general proposed
� AUT Rx/Tx
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CAY
Anechoic Room� Range 7.4 x 4.3 x 4.3 m
� AUT to SGH, distance between absorbers� Exterior 11.5 x 5.0 x 5.0
� Mechanical instrumentation, absorbers and shielding� Shielding
� Sandwich type (galvanized steel plate which sandwich a 19mm wooden core)
� Up to 80 dB shielding up to 40 GHz� Door
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
� Door� 2.0 x 2.5 m semiautomatic shielded door
� 6 Ventilation panels� 2 Flexible penetration panel
� FO� K connectors� He-gas feedtrough
� Absorber� 8´(20cm) and 12´(30cm) combination of pyramidal absorbers� 50dB attenuation from 5 GHz at normal incidence� Left unpainted in critical areas for the mm frequencies
performance� Walkable for access to the instrumentation
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CAY
Current Status
Parent building Ready
RF Intrumentation Ready (Agilent)
Ongoing (NSI)
Anechoic Chamber Ongoing (Rainford)
2-140 GHz CAY Anechoic Chamber IVS VLBI2010 Workshop on Future Radio Frequencies and Feeds
Anechoic Chamber Ongoing (Rainford)
Planar Scanner Ongoing (NSI)
Z-axis Railway Ongoing (NSI)
Control & Software Ongoing (NSI)
Far Field Spherical Stopped