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QuinStar
Technology, Inc., is pleased to announce a newly developed W-Band Interferometer.
The interferometer features high sensitivity and phase resolution. It operates at a
specified frequency in the range of 75 to 110 GHz for the applications of accurate
real-time measurement of amplitude and phase characteristics of a medium such as plasma or
other dynamically changing dielectric material (confined in a chamber or vessel) under
testing. The measurement subsystem works on the principle of coherent signal processing
using a phase bridge. The subsystem includes provisions to calibrate the subsystem and/or
adjust the transmitter signal for a specific chamber or plasma vessel. |
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| Specifications: |
| Center Frequency of Operation: |
75 to 110 GHz |
| Transmitter Power Output: |
10 mW min. |
| Sensitivity of the Phase Bridge: |
2000 mV/ mW typical |
| Phase resolution: |
30 micro-degrees typical (30 x 10-3 degrees) |
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Block Diagram
Figure 1: W-Band Interferometer Block Diagram.
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| Photograph: |
Figure 2: W-Band Interferometer
Photo |
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| Test Data: |
| Center Frequency of Operation: |
105 GHz |
| Transmitter Power Output: |
10.5 mW |
| Conversion Loss of I Channel: |
12.8 dB |
| Conversion Loss of Q Channel: |
13.1 dB |
| I/Q Phase Error: |
±5 degrees |
| Sensitivity of the Phase Bridge: |
2100 mV/ mW |
| Phase resolution: |
29 micro-degrees (29 x 10-3 degrees) |
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| Figure 3: Near Field Scan Raw Data (105 GHz), transmit and receive
antennas are identical |
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