S/N ENHANCER

PROBLEM TO BE SOLVED: To provide the S/N enhancer in which the length of an attenuator occupied in a transmission line is reduced. SOLUTION: The S/N enhancer includes a first coplaner line 12a and a second coplaner line 12b. The first and second coplaner lines 12a, 12b include respectively enter conductors 14a, 14b. Nearly one end of the center conductors 14a, 14b is folded to be almost L-shape. A πtype resistance attenuator 30 is connected between the first and second coplaner lines 12a, 12b. The π type resistance attenuator 30 includes first and second chip resistors 18, 20a, 20b. Nearly one-side ends of the center conductors 14a-14b are connected by a first chip resistor 18. Moreover, one-end of the center conductor 14a and a ground electrode 16 are connected by a second chip resistor 20a and one-end of the center conductor 14b and the ground electrode 16 are connected by a second chip resistor 20b.