| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for improving antenna characteristics in a radio apparatus performing transmission with one antenna by joining transmission signals in a plurality of frequency bands.SOLUTION: The radio circuit (1) includes a two-way coupler (50) that fetches a traveling wave and a reflection wave, and a variable matching element (30) that varies impedance according to electric power of a traveling wave and a reflection wave for each frequency band detected by detection means (40, 33). |
