Within Wide Beam
Why One Shot Can Matter Against Many Drones
A wide microwave beam changes drone defence by making one engagement cycle potentially affect several aircraft at once.
On this page
- The saturation problem swarms create
- How wide area microwave effects change engagement cycles
- Where one to many defence still depends on geometry
Page outline Jump by section
Introduction
THOR’s wide microwave beam changes swarm defence because it alters the relationship between the number of incoming drones and the number of engagements required to stop them. In a conventional one-target-at-a-time model, every additional drone adds pressure to the defender’s tracking, targeting and firing cycle. A swarm succeeds by forcing those cycles to occur faster than the defence system can manage. THOR was designed around a different idea: affect a volume of airspace rather than a single aircraft. If multiple drones occupy that volume, one microwave pulse can potentially disrupt several of them during the same engagement cycle. Public descriptions from the US Air Force Research Laboratory (AFRL) consistently emphasise THOR’s ability to counter multiple targets and its use of a wide beam specifically for swarm scenarios. Air Force Research Laboratory+2Air Force Research Laboratory [afrl.af.mil]afrl.af.milAir Force Research Laboratory AFRL conducts swarm technology demonstrationAir Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — THOR, a high-powered microwave coun…
The significance is not merely that several drones may be disabled at once. The deeper change is mathematical. A defence system that can influence many drones per engagement scales differently against large formations than one that must service each target individually.
The Saturation Problem Swarms Create
Drone swarms create pressure through quantity rather than individual sophistication. A defender facing fifty drones does not simply face fifty times more aircraft; it faces a compressed decision problem in which detection, classification, prioritisation and engagement all occur within a short time window.
Traditional interceptors often operate according to a roughly linear relationship. If ten drones appear, the defender may need approximately ten engagements. If one hundred appear, the number of required engagements rises correspondingly. Even highly effective systems can become saturated if incoming targets arrive faster than engagements can be completed. This challenge has become a central concern in counter-drone planning because relatively inexpensive drones can be fielded in large numbers. [DroneShield]droneshield.comA Counter to Drone Swarms: High-Power Microwave…Military forces must prioritise a counter to drone swarming tactics with wh…
From a swarm designer’s perspective, the goal is often not to make every drone survive. The objective is to overload the defender’s engagement capacity. If enough aircraft arrive simultaneously, some may pass through simply because the defender runs out of time, ammunition or engagement opportunities.
This is the problem THOR was created to address. AFRL describes the system as a counter-swarm weapon designed for the non-kinetic defeat of multiple targets rather than isolated aircraft. Air Force Research Laboratory+2Air Force Research Laboratory [afresearchlab.com]afresearchlab.comuses high power microwaves to cause a counter…
How Wide-Area Microwave Effects Change Engagement Cycles
The most important shift is from target-centric engagements to area-centric engagements.
A laser or missile is generally assigned to a specific drone. The engagement cycle begins with identifying a target and ends with applying effects to that target. The process then repeats. Even when these cycles are rapid, the defender is still processing individual aircraft.
THOR’s concept is different. A high-power microwave pulse creates an electromagnetic effect across a broader region than a laser spot. Drones inside that region may experience disruption to electronics, sensors, processors, communication links or power-management systems depending on their design and vulnerability. Because the pulse is applied across an area rather than a single point, several drones may be exposed during the same firing event. Air & Space Forces Magazine+2Potomac Officers Club [airandspaceforces.com]airandspaceforces.comair forces thor drone swarm demoAir & Space Forces MagazineTHOR Hammers Drone Swarm with High-Power Microwaves19 May 2023 — THOR uses bursts of high-power microwave ener…
The practical consequence is that the engagement cycle is no longer tied one-to-one with the target count. Instead of asking:
- How many drones can I engage per minute?
The defender can begin asking:
- How many drones are inside the affected volume when I fire?
That distinction changes the economics of defence. A pulse that affects five drones is not merely five successful engagements; it is one engagement cycle producing five outcomes.
AFRL’s public demonstrations repeatedly describe THOR as engineered to counter multiple targets rapidly. During swarm demonstrations, officials highlighted the combination of a wide beam and high-power microwave effects as key reasons the system could engage entire groups rather than isolated drones. [DVIDS+2Unmanned Airspace]dvidshub.netDVIDSAFRL's THOR Tracks and Disables Drone Swarm"Numerous drones were flown to simulate a swarm attack, and using its wide beam, high peak powers and fast-moving gimble, THOR tracked and turned
The Importance of Engagement Density
One way to understand the mechanism is through engagement density.
Imagine two defensive systems facing a swarm of twenty drones.
The first system can defeat one drone per engagement cycle. Even if every engagement succeeds, twenty separate cycles are required.
The second system affects a cluster of drones whenever they occupy the same engagement volume. If four drones are within the beam during each pulse, only five engagement cycles may be needed to influence the same number of aircraft.
The exact figures depend on geometry, range and drone vulnerability, but the principle remains the same: the effectiveness of a wide-area microwave system grows when targets are spatially concentrated. The swarm’s numerical advantage is partially reduced because several aircraft can be addressed simultaneously rather than sequentially. [Air Force Research Laboratory+2DVIDS]afresearchlab.comuses high power microwaves to cause a counter…
Why Swarm Formation Suddenly Matters More
A wide-beam weapon changes not only the defender’s calculations but also the attacker’s.
When engagements are one-to-one, the main concern for a swarm operator is ensuring enough drones survive individual interceptions. With a wide-area microwave effect, clustering becomes a liability. The closer drones are to one another within the defended volume, the more likely they are to be exposed together.
This introduces a spacing problem. Dense formations may simplify swarm coordination but increase the risk that a single microwave pulse affects multiple aircraft. More dispersed formations may reduce that risk but can complicate navigation, communication and synchronisation.
The result is a trade-off. Swarm designers may be pushed toward wider spacing to reduce the efficiency of area-effect defences. Defenders, meanwhile, seek opportunities where drones naturally converge around approach corridors, chokepoints or terminal attack paths.
The engagement mathematics therefore become partly geometric. The key question is not only how many drones exist, but how many occupy the beam volume at the moment of firing.
Where One-to-Many Defence Still Depends on Geometry
The phrase “one shot against many drones” can be misleading if interpreted too literally.
A wide beam does not mean every drone in the sky is affected. The one-to-many advantage depends on spatial relationships between the emitter and the swarm.
Several factors influence the outcome:
- Target concentration: More drones within the affected volume generally increase the value of a pulse.
- Range: Electromagnetic effects weaken with distance, affecting how much energy reaches target electronics.
- Aspect and orientation: Drone electronics do not present the same vulnerability from every angle.
- Swarm dispersion: Widely separated aircraft may require multiple engagements even if the weapon itself is highly effective.
- Beam placement: The defender must still position the effect where drones are expected to be. [Unmanned Airspace+2DVIDS]unmannedairspace.infoUnmanned AirspaceUS Air Force Research Laboratory demonstrates anti-…“THOR was exceptionally effective at disabling the swarm with its…
This means THOR does not eliminate geometry from air defence; it makes geometry more important. Success depends on placing a wide-area effect where target density is highest.
AFRL’s descriptions of THOR’s operation reflect this reality. Public material highlights not only the wide beam but also tracking systems and a fast-moving gimbal that help position the microwave effect against swarm formations. [DVIDS]dvidshub.netDVIDSAFRL's THOR Tracks and Disables Drone Swarm"Numerous drones were flown to simulate a swarm attack, and using its wide beam, high peak powers and fast-moving gimble, THOR tracked and turned
Why the Mathematics Favour Wide-Beam Systems Against Large Swarms
The fundamental advantage emerges as swarm size increases.
In a one-to-one engagement model, required engagements rise almost directly with the number of drones. The defender’s workload grows alongside the swarm.
In a one-to-many model, workload can grow more slowly because each engagement may influence multiple aircraft. The larger and denser the swarm becomes, the greater the potential payoff from each engagement cycle. That is why AFRL repeatedly frames THOR as a counter-swarm rather than simply a counter-drone system. Its design goal is not merely to destroy drones but to prevent swarm size from overwhelming the defence process itself. [Air Force Research Laboratory+2Air University]afresearchlab.comuses high power microwaves to cause a counter…
The key insight is that THOR’s wide beam attacks the swarm’s principal advantage—numbers. By allowing a single engagement cycle to affect multiple aircraft, it changes the arithmetic from counting targets individually to exploiting target density. In swarm defence, that shift can matter as much as the power of the microwave pulse itself. [DVIDS+2Unmanned Airspace]dvidshub.netDVIDSAFRL's THOR Tracks and Disables Drone Swarm"Numerous drones were flown to simulate a swarm attack, and using its wide beam, high peak powers and fast-moving gimble, THOR tracked and turned
Amazon book picks
Further Reading
Books and field guides related to Why One Shot Can Matter Against Many Drones. Use these as the next step if you want deeper reading beyond the article.
Skunk Works
Highlights how public demonstrations often reveal only part of a program’s capabilities.
Introduction to Electronic Defense Systems
First published 1991. Subjects: Electronics in military engineering.
Fundamentals of Radar Signal Processing
First published 2005. Subjects: Radar, Signal processing.
eBay marketplace picks
Marketplace Samples
Example marketplace items related to this page. Use the search link to explore similar finds on eBay.
Endnotes
-
Source: afrl.af.mil
Title: Air Force Research Laboratory AFRL conducts swarm technology demonstration
Link: https://www.afrl.af.mil/News/Article-Display/Article/3396995/afrl-conducts-swarm-technology-demonstration/Source snippet
Air Force Research LaboratoryAFRL conducts swarm technology demonstrationMay 16, 2023 — 16 May 2023 — THOR, a high-powered microwave coun...
Published: May 16, 2023
-
Source: afresearchlab.com
Link: https://afresearchlab.com/counter-swarm-high-power-weapon/Source snippet
uses high power [microwaves]({{ 'microwaves/' | relative_url }}) to cause a counter...
-
Source: dvidshub.net
Link: https://www.dvidshub.net/video/904353/afrls-thor-tracks-and-disables-[drone-swarmSource snippet
k powers and fast-moving gimble, THOR tracked and turned...
-
Source: droneshield.com
Link: https://www.droneshield.com/blog/a-counter-to-drone-swarms-high-power-microwave-weaponsSource snippet
A Counter to Drone Swarms: High-Power Microwave...Military forces must prioritise a counter to drone swarming tactics with wh...
-
Source: afresearchlab.com
Title: AFRL THOR FS 0122
Link: https://afresearchlab.com/wp-content/uploads/2019/09/AFRL_THOR_FS_0122.pdfSource snippet
COUNTER-SWARM HIGH POWER WEAPONWinner of the What's New in Defense 2021 award. THOR is a counter-swarm electromagnetic weapon the. Air F...
-
Source: airuniversity.af.edu
Title: army partners with air forces thor for base defense
Link: https://www.airuniversity.af.edu/News/Display/Article/2511792/army-partners-with-air-forces-thor-for-base-defense/Source snippet
Air UniversityArmy partners with Air Force's THOR for base defense23 Feb 2021 — THOR is a prototype directed energy weapon used to disabl...
-
Source: airandspaceforces.com
Title: air forces thor drone swarm demo
Link: https://www.airandspaceforces.com/air-forces-thor-drone-swarm-demo/Source snippet
Air & Space Forces MagazineTHOR Hammers Drone Swarm with High-Power Microwaves19 May 2023 — THOR uses bursts of high-power microwave ener...
Published: May 2023
-
Source: potomacofficersclub.com
Link: https://www.potomacofficersclub.com/afrl-demonstrates-microwave-powered-defense-system-against-drone-swarms/Source snippet
Potomac Officers ClubAFRL Demonstrates Microwave-Powered Defense System...23 May 2023 — The AFRL said THOR generates HPM pulses and disc...
Published: May 2023
-
Source: unmannedairspace.info
Link: https://www.unmannedairspace.info/counter-uas-systems-and-policies/us-air-force-research-laboratory-demonstrates-anti-drone-swarm-c-uas-technology/Source snippet
Unmanned AirspaceUS Air Force Research Laboratory demonstrates anti-...“THOR was exceptionally effective at disabling the swarm with its...
-
Source: airuniversity.af.edu
Title: rls thor hammers drones in new video animation
Link: https://www.airuniversity.af.edu/News/Display/Article/2658386/afrls-thor-hammers-drones-in-new-video-animation/Source snippet
Air UniversityAFRL's THOR hammers drones in new video animation16 Jun 2021 — THOR is a prototype Directed Energy weapon used to disable t...
-
Source: afrl.af.mil
Title: rl awards contract for drone killer mjlnir brings new drone hammer to the fig
Link: https://www.afrl.af.mil/News/Article/2945744/afrl-awards-contract-for-drone-killer-mjlnir-brings-new-drone-hammer-to-the-fig/Source snippet
awards contract for drone killer, Mjölnir; brings new...Feb 25, 2022 — The Air Force Research Laboratory has awarded a contract for Mjöl...
-
Source: afrl.af.mil
Link: https://www.afrl.af.mil/News/Video/?dvpTag=Thor&dvpmoduleid=69743Source snippet
Force Research Laboratory VideoTactical, High-power, Operational Responder, known as THOR, is a high-power microwave counter-drone weapon...
-
Source: afrl.af.mil
Link: https://www.afrl.af.mil/News/Photos/igphoto/2003223867/Source snippet
High-power Operational ResponderA high-powered microwave counter drone weapon, stands ready to demonstrate its effectiveness against a sw...
-
Source: dvidshub.net
Link: https://www.dvidshub.net/video/904340/thor-tactical-high-power-operational-responderSource snippet
Thor - Tactical High-power Operational ResponderTHOR is a high power microwave counter-drone weapon that the Air Force Research Lab has d...
-
Source: dictionary.cambridge.org
Link: https://dictionary.cambridge.org/dictionary/english/highSource snippet
English meaning - Cambridge Dictionaryhigh noun (HAPPY PERIOD)... a period of extreme excitement or happiness, when you feel full of e...
Additional References
-
Source: facebook.com
Link: https://www.facebook.com/AFResearchLab/posts/for-this-techtuesday-we-look-back-at-the-power-of-thor-and-what-that-means-for-n/3271349919568312/Source snippet
For this #TechTuesday, we look back at the power of THOR...A high-power microwave counter-drone system, the containerized THOR is design...
-
Source: merriam-webster.com
Link: https://www.merriam-webster.com/thesaurus/highSource snippet
HIGH Synonyms: 529 Similar and Opposite WordsSynonyms for HIGH: tall, towering, lofty, dominant, altitudinous, prominent, eminent, elevat...
-
Source: techbriefs.com
Link: https://www.techbriefs.com/component/content/article/49907-meet-thor-afrls-counter-drone-that-tracks-and-disables-drone-swarmSource snippet
Meet THOR: AFRL's Counter-Drone that Tracks and...THOR is a high-power microwave counter-drone weapon that the Air Force Research Lab ha...
-
Source: ledrones.org
Link: https://ledrones.org/thor-electromagnetic-counter-swarm-drone-weapon/?srsltid=AfmBOopC-BRxt_tfqYWDR_37vP2HMT-a-4mEuAgzRUcytq2gMcb0ZQBaSource snippet
THOR: AFRL Electromagnetic counter-swarm drone weaponTHOR is a counter-swarm electromagnetic weapon developed for defense of airbases. Th...
-
Source: merriam-webster.com
Link: https://www.merriam-webster.com/dictionary/high -
Source: collinsdictionary.com
Link: https://www.collinsdictionary.com/dictionary/english/highSource snippet
of more than normal height; lofty; tall [not used of persons] · 2. extending upward a (specified) distance · 3. situated far above...Rea...
-
Source: youtube.com
Link: https://www.youtube.com/watch?v=0pwv1BOuqN4Source snippet
AFRL's THOR Tracks and Disables Drone SwarmTactical, High-power, Operational Responder, known as THOR, is a high-power microwave counter...
-
Source: youtube.com
Link: https://www.youtube.com/watch?v=QjHGxKb6W1cSource snippet
THOR (Tactical High-power Operational Responder) Destroys...AFRL's THOR (Tactical High-power Operational Responder) is a prototype Direc...
-
Source: twz.com
Title: thor microwave anti drone system downs swarms in test
Link: https://www.twz.com/thor-microwave-anti-drone-system-downs-swarms-in-testSource snippet
THOR Microwave Anti-Drone System Downs Swarms In Test19 May 2023 — The demonstration pitted the service's high-power microwave THOR syste...
Published: May 2023
-
Source: taskandpurpose.com
Title: air force thor directed energy drone swarm test
Link: https://taskandpurpose.com/tech-tactics/air-force-thor-directed-energy-drone-swarm-test/Source snippet
Air Force's THOR directed energy weapon ready for drone...19 May 2023 — The Air Force has successfully employed its primary directed ene...
Published: May 2023
Topic Tree