This paper has been devoted to the solving task of developing a jamming device for suppressing small-sized unmanned aerial vehicles. The paper analyzes modern devices and systems for jamming, means of electronic countermeasures for unmanned aerial vehicles, their features and the principle of operation are indicated. The relevance of these devices to date is substantiated. A small-sized device for jamming in the frequency range from 433 to 6 GHz has been developed. Its structural and circuit diagram has been synthesized, the printed circuit board of this device has been designed on a modern element base. Designed, manufactured and tested a transmitting antenna for this device.