PURPOSE: To provide a method for mounting/assembling a pin switch part, comprising a beam lead type pin diode and a microchip type capacitor, as an input signal receptor for a radio frequency spectrum analyzer by taking advantage of high speed switching performance and long service life of the pin switch in ultrahigh frequency band.

CONSTITUTION: One beam lead 7 of a beam lead type pin diode is wedge bonded 16 to a microchip capacitor 9 thus constituting a pin switch part 5. The bottom electrode 11 of capacitor is then bonded through a conductive adhesive 12 to the structural base part 15 and grounded. The other beam lead 8 at the pin switch part 5 is placed on the input signal transmission path, i.e., a coupling loop 4, while being superposed on a solder paste ball 13. The solder paste ball 13 is then irradiated with a laser beam 14 and thermally fused thus effecting solder joint.