| 摘要 |
There is disclosed a microwave device comprising a substrate made of a dielectric material and a frequency conversion circuit formed on a front surface of the substrate and having a microstrip line for input and output thereof and a radio frequency amplifier the substrate being partially thinned in a portion of a rear surface thereof a faced to the radio frequency amplifier, the width of said microstrip lines being selected so that the change in the characteristic impedance of the microstrip lines which crosses the front surface of the substrate, a thickness of which is changed, is smaller than 10 %.
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