FILTER-INTEGRATED EVEN-HARMONIC MIXER AND HIGH-FREQUENCY RADIO COMMUNICATION APPARATUS USING THE SAME

摘要

Configuration of a connection portion between an even−harmonic mixer and a filter is simplified, thereby enabling reduction in size. The even−harmonic mixer (21) is connected to a high−frequency band pass filter (23) via a transmission path (22), thereby constituting a filter−integrated even−harmonic mixer. Here, the length of the transmission path (22) is set so that the impedance when the transmission path (22) side is viewed from a connection point (24) between the even−harmonic mixer (21) and the transmission path (22) is substantially 0 with respect to a frequency fLO of a local oscillation signal. Accordingly, the path length for giving equivalent grounding to the frequency fLO provided in the conventional even−harmonic mixer can delete an end−open stub of about 1 mm. Thus, the connection portion between the even−harmonic mixer and the high−frequency band pass filter is simplified and it is possible to obtain a compact circuit layout of the filter−integrated even−harmonic mixer.