Microwave filter arranged on circuit board of wireless communication product

The present invention is one kind of microwave filter in radio communicator product. The microwave filter is made in printed circuit board making technology. During making printed circuit board for radio communicator product, the microwave filter including one input end, one double-frequency resonant cavity, one output end and other microwave circuit is laid on circuit board. This makes it possible to suppress the double frequency and higher frequency harmonics caused by the non-linear distortion of the power amplifier in the radio communicator without addition high frequency filter, and this can lower the manufacture cost of radio communicator product greatly and reduce the electromagnetic wave interference effectively.