Filter, resonator, and communication device

The invention relates to a filter, a resonator and a communication device. According to the invention, in a process of reducing the temperature drift of the filter by optimizing the height dimension h1 of a metal resonance rod and the height dimension h2 of a boss, an adjusting screw rod is not limited by the resonator and the boss in the process of adjusting the position up and down, that is, in the process of reducing the height h1 of the metal resonance rod, the distance between the metal resonance rod and the top face of the boss in a traditional product does not need to be considered, and the height h1 of the metal resonance rod can be flexibly set according to actual requirements, so that the adjustable range is large, the height h2 of the boss can also be flexibly set according to actual requirements, the adjustable range is large, and the temperature drift of the product can be controlled to be within a preset range; and in order to reduce the temperature drift of the filter, the temperature drift of