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The monolithic integrated circuit of quasi-lumped element low-pass filter has been developed and investigated. The circuit has a form of a suspended coplanar line based on a defected ground structure (DGS). The detail analysis of the filter equivalent circuit has been used to optimize its parameters. The stop-band of low-pass filter exceeds 100 GHz. The filter dimensions are (0.9 × 0.6) mm2.
We describe the design of a waveguide planar Schottky-diode mixer for frequencies of about 200 GHz and a measurement system for testing the mixer performance. A backward-wave oscillator with a frequency doubler was used as the local oscillator. The results of room-temperature measurements of the mixer conversion losses and noise temperature as functions of the frequency and power of the local oscillator...
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