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Anechoic Chambers
Anechoic means "neither having nor producing echoes." In applications discussed here, the echoes typically refer to RF and/or microwave reflections. An anechoic chamber is usually a modular shielded room (or occasionally a welded room) that is lined inside with RF and/or microwave absorbing ("anechoic") material. It is essentially a "stealth room" that is invisible to the products or tests being conducted inside. Depending on the purpose of the room, anechoic material may be placed on the walls and ceiling (usually referred to as "semi-anechoic") or it can be placed on all six sides of the room (aka "fully anechoic").
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Construction
Supporting Structure
An anechoic chamber is normally a modular shielded room with additional structural steel to provide the necessary support for the additional weight of the anechoic material. See the web page on shielded rooms for more information about the construction of the shielded room and the options that are available.
RF/Microwave Absorber
The RF and microwave absorbing material is chosen based on the customer requirements. We offer a wide selection of polyurethane, polystyrene, polyethylene and ferrite absorbers as well as various combinations to suit each unique performance and environmental specification. Please see our web page on rf absorber for more information about our selections.
Models
Electromagnetic Compatibility (EMC)
Anechoic Chambers
EMC chambers are designed to create a controlled environment in accordance with published specifications. An untreated modular shielded room is a resonant cavity with field variations up to 30dB. By incorporating anechoic material in specific designs and configurations, the same room can be controlled to within 3-8dB across a frequency range of 26MHz up to 1GHz, 18GHz or 40GHz (depending on the requirement) - a dramatic improvement on the reliability and consistency of test data acquired. The Compact Anechoic Chamber and 3m Anechoic Chamber are the most popular EMC chambers.
Compact Anechoic Chambers
Features:
- Affordable EMC pre-compliance test solution
- Small size fits in most industrial buildings or office areas (Approx Size: 24' x 10' x 10'h)
- Fully compliant for European radiated immunity tests IEC 61000-4-3
- Excellent for radiated emissions pre-scans and provides accurate correlation with Open Air Test Sites (OATS)
Description
The compact anechoic chamber is the smallest anechoic test facility recommended for performing EMC testing from 26MHz to 1GHz (with an option to go to 18GHz). This style of anechoic chamber allows the user to carry out radiated immunity measurements in full compliance with IEC 61000-4-3 standards and pre-compliance emissions measurements for EN 50147-2, ANSI C63.4 and CISPR 22. The chamber is comprised of a standard modular shielded enclosure, additional structural support and ferrite tile absorber on five sides. Compact anechoic chambers are guaranteed to provide a uniform field variation of less than 6dB across 75% of the test plane when measured in accordance with IEC-61000-4-3. The option to go up to 18GHz requires the addition of foam absorber in specific locations on the walls and ceiling.
Standard Configuration:
- Modular shielded enclosure (Approx Size: 24' x 10' x 10'h)
- Structural package
- Dielectric vapor barrier and hardboard
- Ferrite tile absorber panels for walls, ceiling and 120 sq. ft. of floor area
- Safety net for ceiling
- One (1) single leaf 3' x 7' RF Shielded door. c/w standard handle outside, phenolic handle on inside and door maintenance kit
- One (1) 12" x 12" brass bulkhead connector panel
- Two (2) 12" x 12" waveguide air vents
- Three (3) 1-1/4" brass waveguide penetrations c/w dielectric couplings for fire sprinklers
- Two (2) 2x30amp powerline filters
- One (1) brass ground stud
- Anti-static vinyl floor treatment
- RF shielding effectiveness test per IEEE299 at 1GHz
Options:
- Foam absorber to extend frequency to 18GHz
- Raised floor/ground plane
- Automated turntable (requires raised floor/ground plane)
- Complete ferrite treatment on floor and with corner strips
- Additional powerline and signal filters
- High hat lighting
- Field Uniformity Test (80MHz to 1GHz)
- Normalized Site Attenuation Test (30MHz to 2GHz)
3m Anechoic Chambers
Features:
- Fully compliant for testing radiated emissions per EN 50147-2, ANSI C63.4, CISPR 22
- Fully compliant for European radiated immunity tests per IEC 61000-4-3
- Provides accurate correlation with Open Air Test Sites (OATS)
Description:
3m anechoic chambers are ideally suited for performing both radiated emissions and radiated immunity EMC testing from 26MHz to 18GHz (with an option to go to 40GHz or higher). Like the compact chamber, this style of anechoic chamber allows the user to carry out radiated immunity measurements in full compliance with the IEC 61000-4-3 standard, but the full-scan capability of the 3m chamber allows fully compliant emissions measurements for many (but not all!) International and United States specifications. The chamber is comprised of a standard modular shielded enclosure, additional structural support and a combination of foam and ferrite tile absorber on five sides. 3m anechoic chambers are guaranteed to provide a uniform field variation of less than 6dB across 75% of the test plane when measured in accordance with IEC-61000-4-3 and to exhibit a normalized site attenuation within +/- 4dB of the theoretical normalized site attenuation. The standard configuration provides a "quiet zone" of 6' diameter x 6' high, but this can be enlarged at the customer's request. The option to go up to 40GHz requires additional foam absorber and special floor treatment.
Standard Configuration:
- Modular shielded enclosure (Approx Size: 32' x 24' x 21'h)
- Structural package
- Dielectric vapor barrier and hardboard
- Ferrite tile absorber panels for walls, ceiling and 120 sq. ft. of floor area
- Foam absorber for walls and ceiling
- Safety net for ceiling
- One (1) single leaf 3' x 7' RF Shielded Door. c/w standard handle outside, phenolic handle on inside and door maintenance kit
- 1.5m automated turntable and controller
- One (1) 12" x 12" brass bulkhead connector panel
- Four (4) 12" x 12" waveguide air vents
- Three (3) 1-1/4" brass waveguide penetrations c/w dielectric couplings for fire sprinklers
- Two (2) 2x30amp powerline filters
- One (1) brass ground stud
- Raised ground plane
- RF shielding effectiveness test per IEEE299 at 1GHz
Options:
- Separate shielded control room
- Room modifications and additional foam absorber to extend frequency to 40GHz
- Larger automated turntables
- Additional and/or larger shielded doors
- Additional powerline and signal filters
- High hat lighting
- Field Uniformity Test (80MHz to 1GHz)
- Normalized Site Attenuation Test (30MHz to 2GHz)
Mil-Std 461E Anechoic Chambers
Features:
- Fully compliant for Mil-Std-461E (and earlier versions) emissions and susceptibility testing for both radiated and conducted specifications
- Provides 6dB reflectivity loss from 80MHz - 250MHz and 10dB above 250MHz (extended frequencies available)
Description:
The Mil-Std-461E anechoic chamber is designed specifically for Mil-Std testing. The chamber is comprised of a standard modular shielded enclosure, additional structural support and ferrite tile absorber on five sides. Mil-Std-461E chambers are guaranteed to provide 6dB reflectivity loss between 80MHz and 250MHz and 10dB above 250MHz.
Standard Configuration:
- Modular shielded enclosure (Approx Size: 20' x 20' x 12'h)
- Structural package
- Dielectric vapor barrier and hardboard
- Foam absorber
- One (1) single leaf 3' x 7' RF Shielded Door. c/w standard handles and door maintenance kit
- One (1) 12" x 12" brass bulkhead connector panel
- Two (2) 12" x 12" waveguide air vents
- Three (3) 1-1/4" brass waveguide penetrations c/w dielectric couplings for fire sprinklers
- Two (2) 2x30amp powerline filters
- One (1) brass ground stud
- Anti-static vinyl floor treatment
- RF shielding effectiveness test per Mil-Std-285 at 1GHz
Options:
- Additional powerline and signal filters
- Shielded control room
The MiniRange
Features:
- Cost effective solution to full size walk-in chambers
- All-aluminum construction and optional cart allow the chamber to be easily moved around
- Small size (36"W x 84"L x 36"H) doesn't take up valuable floor space
Description:
The MiniRange, made by Raymond EMC, is a mobile solution for pre-compliance EMC and CTIA testing, 3D antenna pattern measurement, and total radiated power & total isotropic sensitivity testing. Fully equipped with client-specified broadband absorber, integrated antenna and rolling cart, the MiniRange is a cost effective option for product verification prior to fully compliant testing.
When compared to the cost of a walk-in pre-compliant chamber, the all-aluminum MiniRange is a cost effective solution for performing pre-compliant emissions and susceptibility testing on products up to 16" x 16" x 16" in size. A shielded access hatch allows access to the standard 2' x 2' absorber platform at one end of the horizontally oriented enclosure. The integrated broadband antenna mounted at the opposite end allows R.F. transmission and reception while the broadband absorber helps eliminate nulls and hotspots and ensures test repeatability
The all-aluminum MiniRange sits atop a rolling cart complete with an integrated equipment shelf. Cart casters are lockable, providing stability during use. When not in use, the enclosure can be easily rolled to an out-of-the-way location.
Standard Configuration:
- 36"W x 84"L x 36"H (outer dimensions)
- All aluminum construction with protective clear finish
- 2 each 24" x 24" aluminum bulkhead panels located on both 3" x 3" ends of the enclosure
- 24" x 24" RF shielded door
- Lined with 6" broadband pyramidal absorber on all surfaces
- RF Shielding performance 80 dB from 1 MHz to 10 GHz
- Certified RF Shielding Effectiveness Test at 1 GHz to IEEE 299
- Shipping weight 865 lbs
Options:
- Broadband Absorber Size
- Antenna Type
- R.F. Connectors and Filtered Feedthroughs
- Internal Power Package (includes R.F. power line filter, power cord, and internal duplex receptacle)
- Ventilation Package (includes two 6" x 6" honeycomb waveguide air vents, externally mounted exhaust fan, power switch and power cord)
- Signal Line Filters
- Aluminum waveguide pipe penetrations
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