20W Drone Jammer Module 870-960MHz LDMOS

Compact High-Power Core for Counter-Drone Systems

Modern counter-UAS operations require building blocks that marry high RF output with plug-and-play simplicity. The 20W drone jammer module delivers exactly that: a 20 W, 870–960 MHz source packed into a 115.5 × 46.5 × 21 mm envelope. Whether you are developing a man-portable backpack unit, a vehicle-mounted dome, or a fixed-site perimeter system, this module eliminates the need to source, match, and tune separate amplifier and signal generator stages.

LDMOS Power Stage: Efficiency Meets Robustness

At the heart of the 20W drone jammer module lies an advanced LDMOS transistor operated in a class AB push-pull configuration. This topology achieves power-added efficiency above 40 % while keeping harmonics low enough that external filtering is rarely needed for wideband jamming. Unlike fragile GaN-on-SiC alternatives, the LDMOS device withstands antenna mismatch up to VSWR 3:1 indefinitely, and the on-board protection monitors reflected power, instantly folding back drive if a dangerous condition persists. Input and output matching networks are integrated on the substrate, contributing to the module’s 21 mm height. A temperature-compensated bias circuit ensures stable gain from -20 °C cold starts to +65 °C ambient operation.

Onboard Agile Sweep: No External Synthesizer

A common bottleneck in jamming system design is the signal source. The 20W drone jammer module removes this hurdle by embedding a high-speed VCO and ramp generator that directly drives the LDMOS stage. Analog scan speed is user-adjustable through a control voltage or fixed preset, spanning 10 MHz/ms to over 100 MHz/ms. Because the sweep covers the entire 870–960 MHz range in a continuous sawtooth pattern, it creates a dense interference spectrum that disrupts frequency-hopping spread-spectrum links without needing to identify the exact channel. For systems that require external modulation, the module can also accept a CW or modulated input through the SMA port, but in stand-alone mode it works right out of the box — just supply DC power and an enable signal.

Straightforward Control and Visual Feedback

Engaging the jammer is a single logic-level action. Driving the enable pin to +5 V or leaving it floating turns on the RF output; pulling it to ground silences the unit. This makes integration with microcontrollers, drone detectors, or manual override switches trivial. Three LEDs on the board report real-time status: a green LED confirms DC supply, a red LED indicates that RF power is present at the output, and an amber LED lights up when reflected power exceeds a safe VSWR threshold. Additional internal protections guard against reverse polarity, over-temperature, and over-current, so the 20W drone jammer module survives the kinds of mishaps common in prototype and field environments.

Thermal and Mechanical Design

The baseplate is CNC-machined from 6061 aluminum alloy and coated with a chemical conversion finish that resists corrosion in outdoor and marine environments. Integrated fins on the bottom surface increase surface area, allowing the module to dissipate 60 W of heat with just moderate airflow or conduction to a cold plate. At 0.21 kg, the 20W drone jammer module adds negligible weight to drone-mounted payloads or manpack systems. Four M3 mounting holes simplify mechanical integration, and the SMA female output connector aligns with standard coaxial cabling. Operating temperature range -20 to +65 °C is verified through thermal cycling tests.

Performance and Integration Summary

Supply voltage is flexible from 24 to 29 V DC, with 28 V recommended for optimal efficiency. Current draw stays below 2.5 A even at full 20 W output. Output VSWR ≤2.0 keeps reflected energy manageable, and the amber warning LED provides immediate feedback if an antenna fault occurs. Because all active circuitry — VCO, driver, LDMOS final, and protection — resides on a single board, system BOM and wiring complexity drop significantly. Engineers using the module in counter-UAS projects report straightforward integration with radar and optical tracking systems, where the fast analog sweep masks the drone’s receiver without requiring precise frequency alignment.