Drone Gun: A Revolutionary Weapon Against Rogue Drones

  • Context: Undergrad 
  • Thread starter Thread starter Zibi04
  • Start date Start date
  • Tags Tags
    Drone Gun
Click For Summary

Discussion Overview

The discussion revolves around the technical aspects of a 'Drone Gun' developed by Drone Shield, which is designed to jam rogue drones by emitting specific radio frequencies. Participants explore the mechanisms of radio wave directionality, the types of antennas used, and the legal implications of radio jamming technology.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants explain that the 'Drone Gun' operates by emitting frequencies between 2.38GHz-2.483GHz and 5.725GHz-5.825GHz, causing drones to activate their safety systems.
  • There is uncertainty about the type of directional antenna used in the device, with some suggesting high gain Yagi antennas while others mention the possibility of helical antennas.
  • One participant describes the principles of radio wave directionality, comparing it to optical principles and explaining how Yagi antennas utilize interference to create a directional emission pattern.
  • Another participant discusses the use of dish antennas for directing radio beams, noting the challenges posed by the wavelength of radio waves in terms of antenna size.
  • Concerns are raised about the legality of radio jamming in the USA, with participants noting that unlicensed jamming is generally illegal.

Areas of Agreement / Disagreement

Participants generally agree on the use of high directional antennas for the 'Drone Gun', but there is no consensus on the specific type of antenna or the legal implications of jamming technology.

Contextual Notes

The discussion includes assumptions about the technology's operation and legality, which may depend on specific regulatory frameworks and definitions of radio jamming.

Zibi04
A company named Drone Shield has developed a 'Drone Gun', which is capable of jamming a drone from up to 1.2 miles (approx. 2 km) away.

https://www.washingtonpost.com/vide...1749443c5e5_video.html?utm_term=.2db123e1e5b2

I am aware of how the jamming works, where the gun emits frequencies of 2.38Ghz-2.483Ghz and 5.725Ghz-5.825Ghz, which are the most common frequencies a drone operates on. Consequently, this causes the drone to think it is out of range, hence activating its safety system and slowly descending to the ground.

However, I am not entirely sure how the radio wave is focused and directed towards the drone

The following image shows a front on view of the gun, http://imgur.com/a/tB7oM
I've labeled what appears to be the source of the directed radio waves.
Does anybody know what type of directional antenna is in these three labeled pieces of the apparatus? I'm unsure whether they'd be high gain yagi directional antennae or helical antennae.

Also, If anybody is able to offer an explanation of how radio waves are focused and directed into a 'beam' as well as how the distance is increased, this would be much appreciated :)
 
Last edited by a moderator:
Physics news on Phys.org
Zibi04 said:
However, I am not entirely sure how the radio wave is focused and directed towards the drone

Clipboard012.jpg
there will be high gain Yagi antennas in one or more of those oblong casings

pretty straightforward technology ... a Yagi for each band of interest ... one in each casing

Zibi04 said:
Also, If anybody is able to offer an explanation of how radio waves are focused and directed into a 'beam' as well as how the distance is increased, this would be much appreciated :)

by the use of yagi or other directional antennas like dish antennas as used for satellite TV
 
  • Like
Likes   Reactions: Zibi04
All the principles you know from optics apply. Radio waves differ in having inconveniently large wavelengths and conveniently slow frequencies that are accessible by electronics.

The dipole oscillators which produce light are atomic sized. The dipole radiators which produce radio waves are most efficient if they are 1/2 wavelength long (usually two 1/4 wavelength long rods end to end). The frequencies you mention have wavelengths of ~12 cm and 5 cm, so you can expect short rods of 6 cm and 3 cm respectively. With just one emitting rod you get a dipole pattern which is strongest in the directions perpendicular to the rod.

The Yagi antenna mentioned above uses several of these dipole emitters in a row. Actually only one is actively driven and the others are driven by the field from the first, but you can think of them as a row of emitters. The principle that results in the emission being directional is interference. This is analogous to a diffraction grating in optics. The distance between the emitters is chosen so that the emitted field is exactly in phase in the direction along the line of emitters. As you go away from that line the emissions are more and more out of phase and cancel. This results in a strong diffraction lobe in the forward direction.

Another way to direct a radio beam is a dish antenna. This works exactly the same as a parabolic mirror in optics. However the collimation of the beam is proportional to the wavelength (see diffraction limit) so a dish reflector for radio waves has to be inconveniently large. For example if you wanted to concentrate the beam into 100 mrad to pick a random number, your 12.5 cm wavelength would require a 40 cm aperture.
 
  • Like
Likes   Reactions: Zibi04
I believe that radio jamming is highly illegal in the USA, regardless of the purpose.

Theaters would love to use cell phone jammers but it is not allowed.
 
anorlunda said:
I believe that radio jamming is highly illegal in the USA, regardless of the purpose.
Yes, radio jamming by unlicensed private citizens would generally be illegal for several reasons. Law Enforcement has several new technologies that they are using to try to deal with rouge drones, and that might be a valid subject for a different thread.

The OP's question has been answered (highly directional antennas are used), so this thread will be closed now. Thank you all for the quality replies.
 
  • Like
Likes   Reactions: davenn