Harmonious screw rod, cavity filter , communication equipment

The utility model provides a harmonious screw rod, cavity filter, communication equipment, this harmonious screw rod include screw rod section and harmonious section, and harmonious section is connected in the first end of screw rod section, surface in the harmonious section has the insulating layer. The utility model provides a harmonious screw rod can reduce the field intensity on the harmonious screw rod owing to be provided with the insulating layer, reduces harmonious screw rod and apron internal surface binding site's current density, can reduce harmonious screw rod to the influence of intermodulation under the circumstances of guaranteeing the regulating frequency by a wide margin, improves the direct rate of intermodulation of mass production product, reduces product cost of maintenance, has promoted the performance of whole product.