Vector Network Analyser

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The Vector Network Analyzer (VNA) and the combination of VNA and Virginia Diode (VNA/VDI) systems at the UCSB Center for Terahertz Science and Technology consist of two microwave bands: the VNA covering the range of 10 MHz to 40 GHz and the VNA/VDI system covering the range of 70 GHz to 700 GHz (0.43 to 4.3 mm or 2.3 to 23.3 cm-1). The power can be varied over a wide dynamic range up to 140 dB and the output power up to 15 dBm. The system has a wide IF bandwidths from 1 Hz to 18 MHz. Its large IF bandwidths and fast synthesizers combine to yield short measurement times and thus high throughput in manual adjustments and automated production sequences. The measurement time per test point is less than 3.5 μs in the CW mode; a frequency sweep over 200 test points takes less than 5 ms.

Vector Network Analyzer and Virginia Diode system at UCSB


Figure 1: The VNA/VDI system


Figure 2: The VDI system

Figure 3: Horn system (from Thomas Keating instruments)

No.
Name
Horn diameter
Length
Range
 
 
(mm)
(mm)
(GHz)
#1
WR10
40
234.12
75 – 110
#2
WR6.5
20
139.50
110 – 140
#3
WR5.1
28
100.80
140 – 220
#4
WR3.4
15
82.50
210 – 330
#5
WR2.2
12
54.20
280 – 440
#6
WR1.5
9
37.70
440 – 660

Specifications of VNA/VDI system:

Frequency range: 70 GHz to 700 GHz
  2.33 cm-1 to 23 cm-1
  0.43 mm to 4.30 mm
Spectral width: (10 Hz to 1 MHz) x harmonic factor
Polarization (linear): > 98 %
Output power: < 6 dBm
Dynamic range: < 120 dB
Pulse profile meas.: 10 ns resolution

Figure 4: Dynamic range of the VNA/VDI system

Figure 5: Output power of VNA/VDI system

 

More detail for each frequency band:
Figure 6: Frequency band of WR10


Figure 7: Frequency band of WR6.5
Figure 8: Frequency band of WR5.1


Figure 9: Frequency band of WR3.4

Figure 10: Frequency band of WR2.2

Figure 11: Frequency band of WR1.5

 

Figure 12: The Chart of the Electromagnetic spectrum with the frequency bands of VNA, VNA/VDI, and FEL-UCSB.