24th October 2016
Berry, New South Wales. Lovely little town surrounded by
beautiful countryside.
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| Great Southern Hotel in Berry |
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| Traditional House in Berry |
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| The Old Post Office |
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| All Roads Lead to Berry |
y
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| Drawing Room Rocks |
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| View from Drawing Room Rocks |
Measuring S
Parameters
- S11 and S21
- Measure magnitude and phase of incident, reflected and transmitted voltage signals
- Output is terminated in a perfect matched impedance Zo
- (Load that equals the characteristic impedance of the test system)
- Matched load impedance ensures no reflection
- S11 is equivalent to the input complex reflection coefficient or impedance of the DUT
- S21 is the forward complex transmission coefficient.
- Can measure S22 and S12 by placing source at port 2 and terminating port 1 in a perfect load
- For packaging applications we are usually only interested with magnitudes, not phase, and can assume linear behaviour
Key Components
- Source for stimulus
- Signal-separation devices
- Receivers that down convert and detect the signals
- Processor/display for calculating and reviewing the results
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| Output from Network Analyser |
Need Test Fixtures
- Making quality RF measurements on devices with standard coaxial connectors is relatively easy.
- Accurate measurements can be made using commercial calibration kits and standard error-correction routines found in most network analyzers
- Devices without connectors are tough
- Test fixture is needed to provide RF compatible electrical connection between the device and test equipment
- In-fixture calibration standards are often required to achieve acceptable accuracy
- Also mechanical constraints
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