Double Knife Edge Door


ETS-Lindgren's Double Knife Edge Door (DKE) is a heavy-duty door, constructed of exceptionally rugged materials with designed-in reinforcements to provide exceptional shielding performance.

ETS-Lindgren's Double Knife Edge Door (DKE) is a heavy-duty door, constructed of exceptionally rugged materials with designed-in reinforcements, making this door suitable for heavy industrial environments or frequent use applications. Additionally, the ETS-Lindgren DKE Door is suitable for welded enclosures, modular systems and anechoic and ferrite-lined chambers, where the external mechanism makes it ideal for material application on its interior surface.

Key Features
  • Precision-Machined Aluminum Hinges with Six Thrust Bushings for Sag-free Mounting and Smooth Operation
  • A 5.08 cm (2 in) Bronze Center Bushing, Capped with 10.16 cm (4 in) Brass Cover Plates, Penetrating the Door Leaf Core
  • Four Rows of Beryllium Copper Finger-stock Around the Perimeter of RCM Receiver
  • Heavy-duty Cam Latch Strikes for Three-point Latching, Guided by Precision Machined Latch Bar Guides
  • Easy-to-retrofit on Standard Modular and Welded Shielded Enclosure
Product Details
Product Features


The ETS-Lindgren DKE Door consists of a factory assembled leaf and frame which maintain electrical contact around the perimeter. The door panel is laminated on both sides with 22 gauge galvanized steel. Heavier gauges are available for improved magnetic field performance. The bronze double knife edge extrusion is mounted on the door leaf and the receiver housing is mounted to the frame. The two knife edges of the leaf mate with four rows of beryllium copper finger-stock mounted in the bronze recessed contact mechanism receiver housing. The beryllium finger-stock is easily maintainable and replaceable with standard tools.
Each door leaf is supported by three heavy-duty aluminum hinges for sag-free mounting and latched by a three-point roller bearing latch assembly. These features serve to provide a high reliability door which will deliver many years of trouble-free service.
The DKE Door is available in the standard size of 0.91 m to 1.22 m (3 ft to 4 ft) width and 2.13 m (7 ft) height, both single and double leaf, and custom fabricated sizes.


The DKE maintains 120 dB attenuation to 10 GHz, 100 dB at 40 GHz, and 90 dB to 100 GHz. When tested in accordance with MIL-STD 285/IEEE-299, the DKE design exceeds the test requirements of NSA-94-106 and CID/09/12A.

Attenuation Levels

Single Leaf Door:

Magnetic Fields: 20 dB @ 1 KHz, 70 dB @ 10 KHz, 90 dB @ 100 KHz, 100 dB @ 1 MHz, 120 dB @ 5 MHz to 30 MHz

Electric Fields: 90 dB @ 1 KHz, 120 dB @ 10 KHz to 30 MHz

Plane Waves: 120 dB @ 50 MHz to 10 GHz

Microwaves: 100 dB @ 40 GHz, 90 dB @ 100 GHz
*DKE performance above 10 GHz can be enhanced using microwave absorber material.


Latching is accomplished manually by a heavy duty aluminum handle on both interior and exterior sides. The door pivots on a minimum of three hinge points on six thrust bearings. The cam driven, manual three-point latching mechanism consists of a gear driven welded latch bar, which is held in alignment by two latch bar bearing guide blocks. The six precision machined latch bar guides secure the assembly on the door leaf and drive three cam follower bearings into the door strikes mounted on the door frame.

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