| 摘要 |
Configuration of a connection between an even-harmonic mixer and a filter is simplified, thereby enabling size reduction. An even-harmonic mixer and a high-frequency bandpass filter are connected to each other via a transmission line, thereby forming a filter-integrated even-harmonic mixer. The length of the transmission line is set so that impedance on the transmission line side as viewed from a connection point between the even-harmonic mixer and the transmission line is approximately 0 for a frequency f<SUB>LO </SUB>of a local oscillation signal. This allows elimination of an open stub which is used in a conventional even-harmonic mixer and of which the line length to provide equivalent grounding for the frequency f<SUB>LO </SUB>is about 1 mm. Thus, the connection portion between the even-harmonic mixer and the high-frequency bandpass filter is simplified and a compact circuit layout for the filter-integrated even-harmonic mixer is obtainable.
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