| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-performance composite circuit adaptive to band broadening, a circuit element, a circuit board and a communication device.SOLUTION: A composite circuit 10 comprises: a first diplexer part 20A through which a forward phase signal in a balanced signal is passed; and a second diplexer part 20B through which a backward phase signal in the balanced signal is passed. A balun part 40 includes a low frequency band side first balun element 41 and a high frequency band side second balun element 42. The first balun element 41 and the second balun element 42 include, respectively, a plurality of lines L12 and L15 which are connected to the first diplexer part 20A and through which signals of different two frequency bands are passed, and include, respectively, a plurality of lines L13 and L16 which are connected to the second diplexer part 20B and through which signals of two frequency bands are passed. A pair of balanced lines 46 are comprised of the lines L12 and L13 and a pair of balanced lines 46 are comprised of the lines L15 and L16. Further, each of the first balun element 41 and the second balun element 42 includes an unbalanced line 45.SELECTED DRAWING: Figure 2 |
