Protecting Missiles From EMI: Real-World Rocket Science
March 17, 2026
Electronic Warfare & EMI Protection · Defense Series 2026
Jammed, Spoofed, and Silenced: How Modern Threats Are Targeting Missiles and Drone Swarms — And Why Shielding Is the Answer
PNA Technologies | April 2026 | 12 min read
The battlefield has gone electromagnetic. Whether it’s a precision-guided missile closing in on a target 40 miles away or a 300-drone swarm executing a coordinated strike, both depend on one thing above all else: uninterrupted signal integrity. And adversaries know it.
Electronic warfare — specifically signal jamming and GPS spoofing — has emerged as one of the most cost-effective and strategically devastating tools in modern conflict. The response from defense engineers isn’t just better software or stronger transmitters. Increasingly, it starts at the physical layer: the gaskets, seals, and shielding that protect every vulnerable seam and joint in a weapons system’s housing.
This article examines how jamming threatens guided missiles and drone swarms, what modern attackers are doing to exploit electronic vulnerabilities, and how EMI/RFI shielding — including the conductive elastomer gaskets produced by PNA Technologies — forms a critical and often underappreciated line of defense.
The Jamming Threat: What's Really at Stake
Electromagnetic interference in warfare isn’t new. But the scale, precision, and accessibility of jamming technology in 2026 represents a qualitative leap from Cold War-era electronic warfare. Adversaries no longer need sophisticated platforms to deny GPS or disrupt datalinks — commercial and semi-commercial jamming equipment has proliferated, and state actors have invested heavily in dedicated electronic attack systems capable of operating across multiple frequencies simultaneously.
How Jamming Attacks Work
At its core, jamming is the intentional transmission of electromagnetic noise or competing signals on the same frequency a target system is using. There are several categories:
- GPS / GNSS Jamming: Overwhelms the weak GPS signal with noise, causing guided munitions and drones to lose positional awareness. Even short interruptions can cause catastrophic trajectory errors in a fast-moving missile.
- Communications Jamming: Severs the datalink between a drone swarm and its operator or between networked assets, effectively blinding command-and-control.
- Radar Jamming: Floods a seeker head with noise or false returns, causing a missile to lose target lock or pursue a ghost.
- Spoofing (a Close Cousin): Rather than brute-force noise, spoofing injects false signals that mimic legitimate GPS or sensor data, causing a system to navigate to the wrong location while “believing” it is on course.
Real-World Impact
Why Missiles Are Uniquely Vulnerable
A precision-guided missile is an extraordinarily complex electronic system compressed into a small, high-speed airframe. The guidance computer, seeker head, fuzing electronics, and datalink receiver all operate in close proximity, generating their own electromagnetic emissions while simultaneously being bombarded by external fields — radar, jammers, and the target’s own emissions. The physical construction of a missile creates natural EMI vulnerabilities. Every joint, access panel, connector, and cable penetration is a potential antenna — a gap through which unwanted electromagnetic energy can enter or exit. At the frequencies used by modern jamming systems, even a gap of a few millimeters can allow significant signal leakage into a guidance compartment. This is precisely where conductive EMI gaskets play a structural role. Placed at every seam and joint in the missile’s housing, they maintain electrical continuity across the airframe, effectively completing the Faraday cage that keeps jamming signals out of the electronics bay. PNA Technologies produces particle-filled conductive elastomers — typically silver-plated aluminum or nickel-graphite suspended in silicone or fluorosilicone — that provide this critical sealing function while withstanding the extreme thermal and mechanical stress of high-speed flight.The Drone Swarm Problem: Scale Makes Vulnerability Exponential
How Swarms Are Jammed
Swarm architectures typically rely on one or more of the following communication approaches, each with its own vulnerability profile:
• Centralized Control Links: A ground station or manned aircraft issues commands to the swarm via a datalink. Jam the uplink frequency and the entire swarm may go dark or revert to pre-programmed fallback behaviors — which adversaries can anticipate.
• GPS-Based Coordination: Each drone uses GPS to maintain its position within the formation. Jam or spoof GPS and the swarm’s spatial coherence breaks down, causing collisions, erratic behavior, or dispersal.
• Inter-Drone Mesh Communication: More advanced swarms use peer-to-peer radio links for coordination. These are harder to jam comprehensively but still vulnerable to wideband noise or targeted frequency attacks.
The Department of War’s Drone Dominance Program — a $1.1 billion initiative aimed at fielding hundreds of thousands of low-cost UAS by 2027 — explicitly recognizes this vulnerability. As a result, all drones in the program must meet specific enclosure-level EMI shielding requirements. The challenge is delivering that shielding at scale, across units priced as low as $2,300 each.
PNA Technologies' Role:
The Cost-Asymmetry Challenge
One of the defining realities of drone swarm warfare is the cost asymmetry between attacker and defender. A $5,000 one-way attack drone is cheap enough to field in the thousands. But if that drone can be defeated by a $200 jamming device, the economics favor the jammer overwhelmingly. The engineering response to this asymmetry must be equally cost-conscious. EMI shielding for low-cost drones cannot add hundreds of dollars per unit. This has driven demand for efficient, manufacturable shielding solutions die-cut conductive gaskets, form-in-place elastomers, and precision-cut seals that can be integrated into high-volume production lines without specialized assembly processes. It’s exactly the kind of rapid-prototyping, custom-cut capability that PNA Technologies brings to drone manufacturers operating under the DoW’s accelerated acquisition model.
Shielding as a System: The Multi-Layer Defense
Layer 1: The Enclosure
The outer housing of a missile or drone acts as a first-order Faraday cage. For metallic housings, this provides baseline attenuation of external fields. For composite or plastic-bodied systems increasingly common as manufacturers seek to reduce weight and radar cross-section conductive coatings or embedded mesh layers are applied to recreate this shielding effect. The critical insight is that a Faraday cage is only as effective as its weakest gap. A housing with 100 dB of shielding attenuation across its main body can be compromised to near-zero effectiveness by a single unshielded seam. This is the functional justification for EMI gaskets: they bridge those seams, maintaining electrical continuity and completing the shield.Layer 2: Gaskets and Seals at Every Interface
Conductive elastomer gaskets serve dual functions. First, they fill the microscopic and macroscopic gaps that exist at every joint — hatches, battery doors, connector panels, and airframe segments. Second, they provide environmental sealing against moisture, dust, and fuel vapors, which is particularly critical for maritime and all-weather UAS operations. PNA Technologies engineers these gaskets to meet specific shielding effectiveness requirements measured in decibels of attenuation — with common military specifications demanding 80 to 100 dB of suppression across a range of frequencies from 10 MHz to 10 GHz. Material selection matters enormously here. Silver-plated aluminum particles offer the highest conductivity. Nickel-graphite compounds provide a cost-effective alternative where silver costs are prohibitive — a practical concern given the 200% surge in silver prices seen in early 2026. Fluorosilicone formulations add chemical resistance for fuel-wetted environments.Layer 3: Cable and Connector Shielding
Inside a missile or drone, cables act as unintended antennas — picking up jamming signals and conducting them directly into sensitive circuits. EMI filter inserts at connectors, ferrite beads on signal lines, and braided shielding on cable runs all contribute to blocking conducted interference from propagating through the system’s internal wiring harness.Layer 4: Board-Level Filtering
Even with a fully shielded enclosure and filtered cables, some interference will reach circuit boards. On-board EMI filters, decoupling capacitors, and shielded compartments within the electronics bay provide the final layer of defense — ensuring that residual interference doesn’t corrupt the signals that guidance algorithms and fuzing computers depend on.
Standards, Compliance, and the MIL-STD Framework
Shielding in defense systems isn’t speculative engineering — it’s governed by a rigorous framework of military standards that define exactly how much protection is required and how it must be verified.
- MIL-STD-461G sets conducted and radiated emission and susceptibility limits for individual subsystems. A missile’s guidance computer, for example, must both avoid generating interference and withstand specified levels of external interference.
- MIL-STD-464D evaluates the entire platform — missile or UAS — for electromagnetic environmental effects (E3) survivability, including high-intensity radiated fields (HIRF), lightning, and EMP.
- MIL-DTL-83528 specifies the material and performance requirements for conductive elastomer gaskets used in military enclosures, covering everything from shielding effectiveness to compression set and environmental durability.
Compliance with these standards isn’t optional — it’s a contract requirement. And it drives procurement toward suppliers with documented material traceability, ISO 9001 manufacturing controls, and the ability to produce consistent, repeatable shielding performance at scale. PNA Technologies maintains ISO 9001:2015 registration and ITAR compliance, and manufactures domestically — qualifications that matter increasingly as defense supply chains face scrutiny over country-of-origin requirements.
The Electronic Warfare Arms Race and Where It's Headed
Jamming technology continues to advance. Cognitive electronic warfare systems can now scan the spectrum, identify a target’s operating frequencies, and adapt their jamming waveform in near-real-time. Anti-drone systems are incorporating AI to identify and jam drone communication protocols autonomously. GPS-denied navigation — once a laboratory concept — is becoming a procurement requirement as adversaries’ spoofing capabilities mature.
The engineering response is running in parallel. Anti-jam GPS receivers with controlled radiation pattern antennas are entering service. Inertial navigation systems capable of maintaining precision guidance through extended GPS outages are being integrated into guided munitions. Frequency-hopping and spread-spectrum communication links are making drone datalinks harder to jam effectively.
But all of these electronic countermeasures share a common dependency: they only work if the hardware running them is protected from the electromagnetic environment it’s operating in. A frequency-hopping radio still needs a shielded enclosure. An anti-jam GPS receiver still needs a gasketed housing to prevent conducted interference from overwhelming its front end.
This is the enduring relevance of EMI and RFI shielding in an era of increasingly sophisticated electronic warfare: the physics of electromagnetic interference doesn’t change as adversaries get smarter. The fundamental need for conductive continuity at every seam, every joint, and every interface remains constant — whether the system in question is a $50,000 precision-guided munition or a $2,300 one-way attack drone.
What This Means for Defense Manufacturers
For engineers and procurement professionals working on guided munitions and UAS programs, the practical implications are direct:
- Shielding must be designed in — not added after the fact. Retrofitting EMI gaskets to a housing that wasn’t designed for them is expensive and often ineffective. Enclosure geometry, seam design, and material selection need to account for shielding requirements from the earliest design stages.
- Material qualification takes time. Conductive elastomers must be tested and qualified to MIL-DTL-83528 — a process that rewards early engagement with suppliers who have documented material traceability and existing test data.
- Cost and shielding performance can be balanced. The choice between silver-plated aluminum, nickel-graphite, and other filler systems allows program managers to optimize for performance, cost, and galvanic compatibility with the host structure.
- Domestic supply chains matter. With ITAR requirements and growing congressional scrutiny of foreign-sourced components in defense systems, working with US-based manufacturers with documented compliance programs reduces program risk.
