| 摘要 |
PROBLEM TO BE SOLVED: To obtain a frequency conversion circuit which can further enhance frequency conversion characteristics without generating a resonance point within a desired frequency band. SOLUTION: A frequency conversion circuit includes a frequency conversion IC 1 which mixes a high frequency signal RF and a local oscillation signal LO and outputs an intermediate frequency signal IF. The frequency conversion circuit further includes: a substrate 2 in which an RF probe 14 is formed for supplying the high frequency signal RF supplied from a waveguide 7 to the frequency conversion IC 1; and a substrate 3 in which an RF probe 15 is formed for supplying the local oscillation signal LO supplied from a waveguide 8 to the frequency conversion IC 1. On the substrate 2, a short stab 12 having an approximatelyλ/4 line length of the high frequency signal RF is disposed of which one terminal is connected to the RF probe 14 and the other terminal is connected to a GND and on the substrate 3, a short stab 13 having an approximatelyλ4 line length of the local oscillation signal LO is disposed of which one terminal is connected to the RF probe 15 and the other terminal is connected to the GND. COPYRIGHT: (C)2011,JPO&INPIT
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