Building Shielding Solutions

Products designed for RF/IR Control, Physical security, Energy savings, and more

rf / ir window film

RF / IR Window Film

Signals Defense proprietary window films, SD2500/SD2510 and SD1000/SD1010

rf ir foil

RF Foil

Ultra NT Radiant Barrier® rFoil™ for SCIF’s

rf paint


RF Paints, Caulks, and Wallpapers

decorative window film


Decorative, solar, safety, and cloaking window films



Glass and polycarbonate security solutions for eavesdropping mitigation



Commercial shades, blinds, shutters and custom window treatments



Governments and Commercial organizations need secure locations that handle sensitive and/or classified information. Our patented Signals Defense window films with RF/IR shielding help to transform ordinary conference rooms, offices, and data centers into secure spaces that can meet TEMPEST standards for protecting electronic equipment from digital theft, accidental data leaks, and espionage.



Signals Defense is a privately held, US company based in Owings Mills, MD. We are committed to protecting information and people.


For more than 22 years, Signals Defense technology has been the standard for RF/IR window films and other shielding materials for Secure Work Environments including SCIFs (Sensitive Compartmented Information Facilities).

Ensure the security of the data stored, presented, and discussed anywhere inside a conference room – or an entire building – with Signals Defense RF and IR window shielding technology. 






DAS Shield effective in-building wireless

Signals Defense, LLC was founded in Owings Mills, MD in 1999 with the introduction of an innovative optically clear window film technology that provides high RF (Radio Frequency) and IR (Infrared) attenuation for RF Shielding and Thermal Imaging defense purposes. Signals Defense patented window technology has been engineered to meet stringent US Intelligence Community security requirements for facilities handling classified information.

Our technology is the de facto written standard for the US Government and for organizations desiring to properly secure locations handling sensitive and/or classified information. Signals Defense window films meet the TEMPEST requirement for the Intelligence Community Directive ICD 705 and the DoD Infrared and Radio Frequency Emanation Protection Standards. Signals Defense technology has been deployed on over 3000 locations providing our clients (including Government Intelligence agencies, DoD, and Fortune 100 companies) with US DoD emission security systems. Signals Defense technology also provides safety and energy benefits to our clients with UV and glass fragmentation/spall control window films, SD glass, and polycarbonates.

Window Film for Enhanced SCIF Security

Our films meet the DOD standards for blocking RF and IR interference in SCIFs, offices, and facilities that handle confidential information.

Our clients are US Government and commercial organizations that need to properly secure locations handling sensitive and/or classified information. Patented Signals Defense RF/IR shielding helps transform ordinary conference rooms, offices, and data centers into secure spaces that can meet TEMPEST standards for protecting electronic equipment from digital theft, accidental data leaks, and espionage.


Signals Defense partners with leading security and film companies across the globe:

  • Eastman Chemical Company

    Founded in 1920, Eastman is a global advanced materials and specialty additives company that produces a broad range of products found in items people use every day. Eastman is a leading manufacturer and marketer of high-performance window tint and paint protection film for automotive applications, window film for residential and commercial applications and the co-developer of the RF/IR attenuating “SD” window film products with Signals Defense. As a globally inclusive and diverse company, Eastman employs approximately 14,500 people around the world and serves customers in more than 100 countries. The company had 2019 revenues of approximately $9.3 billion and is headquartered in Kingsport, Tennessee, USA. For more information, visit

  • Covertech Fabricating, Inc

    Covertech manufactures rFoil Ultra NT Radiant Barrier Foils and tapes for SCIFs (Sensitive Compartmented Information Facilities) construction.  These highly effective radiant barrier products are also an approved vapor barrier.  Signals Defense partnered with Covertech in 2016 to be a nationwide distributor. Visit Covertech/rFoil 

  • AIT

    The AIT Group is a world leader in manufacturing and supporting architectural, security, ballistic, blast, impact, and decorative glass laminates, among other innovative materials.  They specialize in producing advanced combinations of materials and processing them to meet design and security needs for a variety of applications. Visit AIT

  • RF Defense

    RF Defense has experienced technicians that have over 20 years and hundreds of facilities and products tested utilizing our unique approach to Shielding Effectiveness Testing. If you require Instrumented testing whether it is RF or STC, no one can beat RF Defense in practice and knowledge. Visit RFDefense today to schedule testing.

Signals Defense Logo

3 Easter Court

Suite L

Owings Mills, MD 21117