Modular VNA Extenders forExtenders for Terahertz Frequenciesvadiodes.com/VDI/pdf/Duan VDI VNA...
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Modular VNA Extenders for Extenders for Terahertz Frequencies Frequencies Yiwei Duan and Jeffrey L. Hesler Jeffrey L. Hesler --- Virginia Diodes, Inc. www VADiodes com www.VADiodes.com 20th Intl. Symp. on Space Terahertz Technology An early prototype shown at IMS 6/2008 1 April 20-22, 2009 – Charlottesville, VA
Transcript of Modular VNA Extenders forExtenders for Terahertz Frequenciesvadiodes.com/VDI/pdf/Duan VDI VNA...
Modular VNA Extenders forExtenders for
Terahertz FrequenciesFrequencies
Yiwei Duan and Jeffrey L. HeslerJeffrey L. Hesler
---Virginia Diodes, Inc.www VADiodes comwww.VADiodes.com
20th Intl. Symp. on Space Terahertz Technology
An early prototype shown at IMS 6/2008
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April 20-22, 2009 – Charlottesville, VA
BackgroundVDI h bli h d hi f b ildi b db d• VDI has an established history of building broadband receivers and sources; generally for science applications.
• These same subsystems are exactly what is needed for high-These same subsystems are exactly what is needed for highquality VNA extenders.
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A Modular 140 - 1,000 GHz “Starter Kit”
Matching set of new zero-bias detectors
• Series of cascaded multipliers and
WR-10 Amp & Multipliers
zero bias detectors
pdetectors for scalar measurements
• Tunerless, instantaneous sweeping over > 40% bandwidth– Rapidly interchangeable components
Modular 140 – 1,000GHzTransmitter SystemTransmitter System
Output power vs frequency
1
x2x2
x3x3
0.1
wer
(m
W)
2 32 3
x2x2x2x2
0.01
Pow x2x3x2x3
x3x3x3x3
0.001
100 200 300 400 500 600 700 800 900 1,000 1,100
Frequency (GHz)Frequency (GHz)
VDI Broadband Mixers are a standard commercial product & are continually
d limproved: Example – WR6.5SHM
2007www.VADiodes.com 5
VDI’s First VNA Extender ProjectIn ~2006 ESA-ESTEC was looking for an extender for a R&S
ZVA40 for their antenna test range.
Goals:• Cover WR6.5 and WR4.3 bands.• Greater Tx power and dynamic range than was commercially available at the time.
VDI developed an initial prototype extender that yield ~100dB d i th id b ddynamic range across the waveguide band.
www.VADiodes.com 6
THz Systems – VNA Extensions
WR-4.3 Receiver: 170-260 GHz
WR-4.3 Transmitter: 170-260 GHz
www.VADiodes.com
Initial Testing with ZVA40 at ESA
2007www.VADiodes.com 8
WR6.5 Tx Power and Rx Sensitivity
10
15os
s (d
B)
0
5
) or S
SB L
o
-5
0
ower
(dB
m)
-10110 120 130 140 150 160 170
Frequency (GHz)
Po
Tx Power (dBm) Rx Loss (dB) (SSB)
www.VADiodes.com 9
WR-4.3 Transceiver with ZVA-40 VNA
110Dynamic Range of VDI Tx-Rx with ZVA-40
SignalSignal
90
100
ge (
dB)
70
80
mic
Ran
g
Ref.Ref.
50
60
Dyn
a
40
170 190 210 230 250
Frequency (GHz)
www.VADiodes.com
q y ( )
WR-4.3 Transceiver with ZVA-40 VNA
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Phase Stability: Tx + WR-4.3SHM & WR-4.3HM
6
8
10
e (d
eg)
0
2
4
Pha
se
0
0.0 0.2 0.4 0.6 0.8 1.0
Time (hours)
• Initial temperature settling (10-15 minutes).
• Fixed frequency, open lab environment.
www.VADiodes.com 114/27/2009
WR-4.3 Transceiver with ZVA-40 VNA
• Measure loss of 6070
Loss of WR-5 LSA-CM
Custom Microwave WR-5 Level Set Attenuator30
405060
oss
(dB
)
– Set to full attenuation
• Demonstrates ability t l
01020Lo
to measure samples with very high loss
170 190 210 230 250
Frequency (GHz)
Meas: TX + Coupler + WR-4.3SHMMeas: TX + Coupler + WR 4.3SHM
4/27/2009
WR-2.2/1.5 Modular VNA Extender
An early prototype with
www.VADiodes.com 4/27/2009
An early prototype, with excellent performance but yet to be productized.
WR-2.2/1.5 Modular VNA Extender
www.VADiodes.com 4/27/2009
Dynamic Range Measurement100
80
90
100dB
) BW = 100Hz
50
60
70
rang
e (d
30
40
50
ynam
ic r
0
10
20Dy
260 360 460 560 660 760
Frequency (GHz)
www.VADiodes.com 4/27/2009
First WR1.0 Dynamic Range Measurement for a VDI Extender
70
80
)BW = 100Hz
50
60
ange
(dB
20
30
40
nam
ic R
a
0
10
20
Dy
0
650 750 850 950 1050
Frequency (GHz)
www.VADiodes.com 4/27/2009
Conclusion: • VDI has used high quality mixers and multipliers to demonstrate VNA extenders with very high dynamic range throughoutwith very high dynamic range throughout the 100 – 1,000GHz band.
• These have been demonstrated with modern R&S and Agilent VNAs with goodmodern R&S and Agilent VNAs with good results.
• VDI is presently shipping extenders for WR10 WR1 5WR10 – WR1.5.
• Also, the physical layout and frequency bands are “negotiable.”Th t t bilit i it d d th• The system stability is quite good and the cal kits & procedures are being developed.
• This is a good example of a “THz” technology developed for Science that istechnology developed for Science that is now being transitioned for more broad applications.
