The idea for a 134Ghz system started about 18 months ago. Initially I intended to use an Impatt diode source. This proved to be very noisy, and hence requiring a large bandwidth. The plot shows the oscillator on 161 GHz. The higher (blue) trace was measured with a commercial mixer (110-170GHz), the lower used a 'test module' from an Alcatel 38GHz 'white box'. This shows that even at 160GHz the test modules work as a low cost mixer! The signal bandwidth is much greater than the spectrum analyzer 2MHz bandwidth, so the true power is greater than the plot.
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