M6. The same MMW measurement in frequency domain as in M5 but with the Quinstar low noise preamplifier QLW-50754530-I2 (purchased from grant funds) and with application of the extended calibration technique using MMW attenuator in order to get larger SNR (September and October 2014).
The similar measurement campaign was performed as the measurements of MMW in-vehicle channel using spatial grid in frequency domain performed on 11 Aug 2014. The dynamic range of the measurement setup was increased using an MMW low noise amplifier connected to the RX antenna. The measurement setup was calibrated for zero transmission while the open-ended waveguide antennas were connected to each other using an MMW attenuator. The measured data including this added attenuation had to be additionally corrected.
VNA specifications for MMW measurement:
- Start frequency 55 GHz
- Stop frequency 65 GHz
- Bandwidth 10 GHz
- Frequency step size 10 MHz
- Number of points 1001
- IF bandwidth 100 Hz
- Dynamic range ≈ 60 dB
- Output power 5 dBm
Equipment of measuring workplace:
- Vector Network Analyzer R&S ZVA67
- MMW broadband power amplifier QuinStar QPW-50662330-C1
- DC power supply Diametral P230R51D
- Phase-stable coaxial cables MEGAPHASE: TM67-V1V1-98, TM67-V1V1-138
- Open-ended waveguide antennas QuinStar QWS-V02000
- Waveguide components QuinStar: QWB-V90ER, QWB-V90HR, QWT-V90RR
- WR-15 to 1.85mm female adapters QuinStar QWA-15R18F00
- 1.85 mm female to 1.85 mm female adapters
- Precision cross table
- Vacuum glass holder
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