This section provides an overview for anechoic chambers as well as their applications and principles. Also, please take a look at the list of 33 anechoic chamber manufacturers and their company rankings. Here are the top-ranked anechoic chamber companies as of April, 2024: 1.O'Neill Engineered Systems, Inc., 2.ETS-Lindgren, 3.IAC Acoustics.
Table of Contents
An anechoic chamber is a laboratory or research facility that does not leak electromagnetic waves outside and does not reflect them inside.
Reflection of electromagnetic waves is suppressed by installing a radio wave absorber inside the shielded room. Not only is there no leakage of electromagnetic waves to the outside, but the room is also unaffected by electromagnetic waves from the outside. The disadvantage of a shielded room is that it cannot prevent the diffuse reflection of electromagnetic waves in the interior space. An anechoic chamber, however, can prevent the diffuse reflection of electromagnetic waves and create an environment similar to a free space (open site).
In recent years, we are surrounded by many sources of electromagnetic waves, such as electrical and electronic equipment, wireless devices, and information systems, and there is concern that the electromagnetic waves generated by these sources may adversely affect peripheral equipment. Anechoic chambers, which block out the influence of the surrounding environment, play a major role in confirming the performance of wireless devices and electronic equipment such as smartphones and wireless LANs, as well as in noise testing.
Anechoic chambers can be used for acoustic measurements (e.g. sound power level measurements) of products that generate sound, such as automobiles, power trains, electrical equipment, and communication devices. The measurement methods, the configuration of anechoic chambers themselves, and their specifications are established by the ISO.
In recent years, there has been an increasing demand for large-sized hemi-anechoic chambers for pass-by noise measurements in automobiles. Combined tests are also conducted by adding wind tunnel test facilities and constant temperature and humidity facilities. The room can be used not only for physical measurement of sound sources but also for psychoacoustic experiments to evaluate the effects on human psychology and auditory perception.
An anechoic chamber is designed to block both external and internal electromagnetic waves. The outside of the chamber is shielded to prevent outside radio waves from entering to prevent malfunctions during testing, and the inside of the chamber has radio wave absorbers installed on the inside of the walls to prevent radio waves from being reflected inside the chamber.
To prevent the testing equipment from catching the radio waves reflected inside the room, the radio wave absorber on the wall surface absorbs the radio waves generated inside. The base of this anechoic chamber is a shielded room. Using a shielding material that not only absorbs within the material but also reflects on its surface, a great shielding effect is achieved by completely reflecting radio waves.
An anechoic chamber is a room in which electromagnetic wave absorbers are installed. Three types of characteristics are important for absorber materials: magnetic, dielectric, and resistive. It is necessary to determine these properties appropriately in light of the absorption bandwidth and other conditions to be achieved.
Ferrite is the mainstream material that satisfies these requirements. Ferrite utilizes the properties of magnetic loss, such as natural resonance and magnetic wall resonance, in response to high-frequency AC magnetic fields, and has the characteristic of suppressing the reflection of radio waves by converting the absorbed radio wave energy into heat energy inside the absorbing body.
A typical anechoic chamber consists of glass wool made of a wire frame and thin cloth, placed in a wedge-shaped mold, with the inside of the room on the pointed side, and with no gaps between the ceiling, floor, and walls.
A room in which only the floor surface is not absorbing sound is called a semi-anechoic chamber, and can be used for measurements of automobiles and home appliances. The floor of an anechoic chamber is floated by means of a slatted steel frame or a wire stretched in a grid pattern. The entire room may be floated from the building by an elastic material.
Glass wool by itself is an excellent sound absorbing material, but when it is wedged, sound waves that reach the wedge surface are repeatedly reflected and absorbed by the surfaces of adjacent wedges, making it even more effective in sound absorption.
An anechoic chamber is a completely sealed space, which completely shuts out (shuts out) sound from outside the room, making the room very quiet. This is because the background noise in an anechoic chamber is lower than the sound generated by the object under test. In order to measure a small sound, the sound insulation performance must be proportionally higher. Therefore, a rigid body such as concrete or sound insulation panels is necessary for the sound insulator or sound insulation layer in an anechoic chamber.
Sound generated from the object to be measured in the room is absorbed by the sound-absorbing surface. However, there is a difference in sound absorption between high frequency and low- frequency sounds. Basically, the lower the sound, the harder it is to absorb. Therefore, if an anechoic chamber is used to measure low sound, the sound-absorbing body must have a proportionally higher sound absorption performance. Therefore, the sound-absorbing body or sound-absorbing layer in an anechoic chamber requires a sound-absorbing wedge or a thick sound-absorbing block.
In order to achieve "high sound insulation performance" and "high sound absorption performance," proportionally thicker layers are required. A full-scale anechoic chamber may be massive, with a sound insulation layer of 500 mm or more and a sound absorption layer of 1,000 mm or more, and requires a large space for installation.
In many cases, it is practically difficult to secure a large space in Japan. Conversely, in recent years, anechoic chamber manufacturers have improved their technology and developed anechoic chambers with thinner sound insulation and sound absorption layers. Since the layers are thin, installation space can be saved and the effective space in the room can be increased. In view of the above, anechoic chambers with thin and high sound insulation and sound absorption performance are required.
Anechoic chambers can be classified into two major types in terms of the structure of its construction: a six-sided anechoic chamber with absorbers installed on all six sides of the chamber (top, bottom, front, back, left, and right).
The other is a 5-sided anechoic chamber with absorbers on all 5 surfaces except the floor. 5-sided anechoic chambers are characterized by the fact that they do not have absorbers on the floor, assuming radio wave reflection on the ground (earth).
The size of the anechoic chamber, which determines the performance index of the anechoic chamber, is determined by various factors. For example, the size of the object to be measured, the frequency band to be shielded, and the standard of the test (10m method or 3m method, etc.). These factors will determine whether to put the equipment in an existing building or construct a new building. Since they are not inexpensive, careful consideration is required.
An important performance indicator for anechoic chambers is a property called Normalized Site Attenuation (NSA). As specified in CISPR 16-1-4, the maximum propagation loss is obtained when the transmitting and receiving antennas are placed facing each other, the height of the receiving antenna is moved between 1 m and 4 m, and the transmitting antenna is also moved within the specified range. The value must be within +/- 4dB compared to the theoretical value (value at the open site).
There is also a test called SVSWR (site voltage standing wave ratio), which requires that the maximum change in received level in an anechoic chamber with absorbers on all six sides must be less than 6 dB when the transmitting antenna position is changed within a specified range.
*Including some distributors, etc.
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O'Neill Engineered Systems, Inc., established in 1988 and based in Hartland, Wisconsin, United States, is a manufacturer of noise control products. The company offers products such as acoustic doors, sound barrier walls, noise enclosures, and acoustic test chambers. These are used in different applications such as manufacturing, industrial, healthcare facilities, product testing, and building systems. The company's products address all kinds of noise problems and it can be installed in both commercial and industrial buildings.
ETS-Lindgren is an American manufacturer of electromagnetic as well as acoustic energy components and systems established in 1993 as a subsidiary of ESCO Technologies Company. Based in Cedar Park,Texas, the company produces a wide range of acoustic energy components including various probes and monitors, absorbers, amplifiers, and filters. Its products are used in wireless communication devices, safety testing and shielding applications, and noise removal. ETS-Lindgren primarily serves clients in the defense, government, wireless technology, and information technology sectors.
IAC Acoustics, established in 1949 and headquartered in Illinois, United States, is a manufacturer and supplier specializing in metal noise control solutions. The company’s portfolio caters to industrial, architectural, and medical applications. Their industrial solutions include in-plant and outdoor enclosures, noise barriers, and anechoic chambers. Architectural solutions include secure facilities, acoustical doors, windows, and music practice rooms. Their medical solutions include audiology booths and test chambers. IAC Acoustics provides noise control products and acoustic systems locally and internationally to clients across various industries.
Isotech was founded in 182 and is headquartered in Hatfield, Pennsylvania. Isotech is a manufacturer’s representative and distributor of proprietary mechanical and electromechanical products to the industrial, medical, and military OEM and in-plant markets. Some of Isotech’s products include linear slide assemblies & rail sets, shock/vibration mounts & pads, linear bushings & shafting, telescoping lifting columns, positioning stages, air bearings, gas springs/air cylinders, motorized positioning tables, laser marking cutting systems, foamed aluminum/metal/composites, stamped metal, noise control products, and belt driven actuators.
Signet Automation Engineers Pvt. Ltd. is a manufacturer of diverse industrial solutions, that specializes in surge protection, lightning protection/earthing, and safety equipment. Established in 2002 and based in India, the company offers a wide range of products including Lightning Arresters, Surge Arresters, Wheel Balancing Machines, Acoustic Soundproofing Panels and many more. Catering to Electrical, Automobile, Mechanical, and Acoustic sectors, its offerings aid to safeguarding systems and enhancing efficiency across industries.
Ecotone Systems, located in Greater Noida, India, is a manufacturer of radio frequency and green building solutions. Its array of acoustical products, including RF shielded chambers, anechoic chambers, EMI and EMC chambers, along with customized absorbers, are utilized to support testing, development, and functionality of electronic systems in environments where managing electromagnetic interference is crucial. The company offers a diverse range of absorbers, tailored to specific needs with varying thicknesses and absorbencies. All products comply with international standards, and its RF absorbers are specifically tested as per NRL 8093 requirement
E&C Anechoic Chambers nv, a subsidiary of Albatross Projects established in 1948 is a designer and manufacturer of microwave absorbing materials and anechoic chambers headquartered in Nijverheidsstraat, Westerlo, Belgium with an additional facility in Kwun Tong Kowloon, Hong Kong. The company offers EMC hybrid, hollow pyramidal, walkable, wedge, and flat absorbers available in numerous designs and sizes to achieve the required absorption in a specific range. Its absorbers satisfy the REACH and RoHS directives for safe workspaces. The company offers products and their custom parts for use in aerospace & defense, electronic, telecom, medical, and automotive industries.
Founded in 1944, Rion Corporation, based in Tokyo's Kokubunji City, is a precision equipment manufacturer. It specializes in three main sectors: environmental measurement instruments for noise and vibration analysis, medical equipment for hearing tests and hearing aids, and particle counters for semiconductor and pharmaceutical cleanliness measurement. Rion boasts significant market share in Japan, driven by its advanced technology and service excellence. In environmental measurement instruments, it offers noise meters, vibration meters, and frequency analyzers. In 2022, Rion expanded its environmental division by acquiring Norsonic AS, a prominent noise meter manufacturer. The company caters to diverse customers worldwide, including government agencies, research institutions, manufacturing industries, and R&D departments. With eight subsidiary companies (five in Japan and three overseas) and a global agent network spanning approximately 60 countries, Rion Corporation maintains a strong global presence.
Anritsu Corporation, established in 1931 and based in Atsugi, Japan, is a manufacturer of electronic measuring instruments, quality assurance systems, and Information and Telecommunication equipment and devices. Its test and measurement products include power meters, power sensors, and conformance test systems, while X-ray inspection systems, metal detectors, and checkweighers ensure food safety and security. Other products like instrumentation-grade adapters and optical sensing equipment are used in IT. The company’s stock was listed in the 2nd section of the Tokyo Stock Exchange in 1961, and in 1968, it was listed in the 1st section.
TDK Corporation, established in 1935, is a manufacturer of electronic solutions for the smart society based in Tokyo, Japan. The company is a part of the TDK Group, which has over 250 locations in more than 30 countries worldwide and employs over 103,000 people. They offer a wide range of products, including sensors, power supplies, and magnetic application products. The robotics industry is evolving at a rapid pace, and they are now offering , a robot development platform equipped with a variety of sensors essential to the accurate operation of robots, enabling more efficiency across a wide range of robot development.
Microwave Vision Group (MVG), established in 1986, is a manufacturer with its corporate headquarters located in Paris, France, specializing in technologies that enable the visualization of electromagnetic waves. The company’s offerings include antennas and antenna measurement systems. It also provides anechoic chambers, modular shielding, as well as precision cut and coated absorbers under the SmartShield brand, tailored for antenna measurement, as well as radio frequency (RF) and electromagnetic pulse (EMP) testing. Additionally, the company offers hyperloss absorbers through its subsidiary, Advanced ElectroMagnetics, Inc. (AEMI). The company serves various industries including aerospace, automotive, consumer electronics, and telecommunications, along with academic and research institutions.
Holland Shielding Systems BV, established in 1985 in The Netherlands, started as a manufacturer of electronic components and now produces a wide range of frequency and electrical shielding systems. The company's products include PCB shielding cans, farraday cages, frame gaskets used for farraday-integrated tents, EMI displays, mesh foils to shield against magnetic, low-frequency radio waves, microwave radiation, and equipment used in earthing against high-voltage dangers. Their products are used by the FCC to prevent electromagnetic interference and customize facility shielding systems to protect against eavesdropping.
KGS Kitagawa Industries Co. Ltd., established in 1963 and headquartered in Inazawa, Aichi, Japan, is a manufacturer of electronic components. The company offers a wide range of products, including EMC components for noise suppression and electromagnetic compatibility, plastic fasteners for securing PCBs and cables, vibration, shock & sound damping materials, thermal management materials, and sputtering functional thin films. The company has obtained ISO9001 certification, ISO14001 certification, IATF16949 certification, and ISO/IEC17025 accreditation.
Siepel, founded in France in 1950, is a manufacturer and supplier of research data protection measurements and electromagnetic solutions. It specializes in microwave absorbers as well as shielded rooms designed to protect against electromagnetic interference, anechoic chambers designed to absorb reflections of sound or electromagnetic waves, and reverberation chambers designed to simulate the effects of a large space of electromagnetic waves. It also provides standards and technical recommendations for its products and services, as well as cybersecurity solutions for the mobility sector.
Dinesh Micro Waves & Electronics, established in 2008 and headquartered in Coimbatore, India, is a manufacturer, supplier, and exporter specializing in telecom equipment and associated components. The company's product range includes a wide array of offerings, including telecom antennas and systems, telecom towers and accessories, anechoic chambers, testing antennas, and testing systems. These products cater to sectors such as textile machinery, telecom components, power supplies and batteries, satellite systems and broadcasting, and more.
Micronics is an ISO 9001-certified manufacturer of measurement systems, ultrasonic sensors, and flow meters that was established in Tokyo, Japan, in 1984. The company produces a broad range of measurement systems, parts, and components. These products include fixed flow meters, clamp-on flow meters, and portable flow meters. It also offers product testing, calibration, and troubleshooting services for customers requiring additional support. The company’s products are commonly used in water processing, energy management, and environmental protection operations.
E&C Engineering K.K., established in 1991 and based in Yokohama, Japan, is a manufacturer and supplier of radio wave absorbers. The company's product range includes flexible and thin broadband-type radio absorbers, high-loss silicon rubber sheet, resonance and thin sheet-type radio absorbers, resonance and thin sheet-type radio absorbers, and 60.0GHz sheet radio wave absorbers. These products are used in applications such as 5G, Automotive, Aerospace and Defense, and EMC/EMI. These services include testing facility provision, technical skill support, radio wave test facility design, and manufacturing collaboration through mergers.
Microwave Factory Co., Ltd. established on February 25, 2003, and based in Japan, is a manufacturer and supplier of Shielded Rooms and Boxes. The company's product range includes the ESD Visualizer, Anechoic Chamber, Radiowave Absorbers, an Antenna Measurement System, and an OTA Measurement System. These products are designed for tasks such as electromagnetic wave measurement, 5G communications testing, microwave assessments, and antenna measurements. Key industries benefiting from these products are Automotive, Aerospace and Defense, Electronics, and Telecommunications. Its services include automatic measurement software solutions, production of positioners like turntables, and supply of accessories for electromagnetic wave testing.
Sonea Latechnology, founded in 2003, and based in Setagaya-ku, Tokyo, is a manufacturer and supplier of specialized acoustic equipment. The company's product range includes assembled anechoic rooms, assembled semi-anechoic rooms, anechoic boxes, soundproof chambers, and soundproof covers. These products are essential for precise acoustic measurements in various settings, from R&D environments in automobile and electronics industries to smaller components' noise assessment. They serve sectors such as automotive manufacturing, electronics, acoustic research, and machinery production. The company also offers design consultation, soundproof chamber construction, and soundproof cover production.
Frankonia specialzes in equipment used to test for radio wave emissions for antennas, the automotive industry and the military. Frankonia makes equipment used to create a chamber for the tests to be carried out such as wall panals and chambers. They also provide the equipment required for the testing. Founded in 1987 Frankonia is the industry leader in electromagnetic compatibility solutions. Based in Bavaria, Germany Frankonia offer a wide range of services from consulting, construction and manufacturing. Frankonia have a worldwide customer base with their unique products. They tailor to the individual needs to each of their customers.
IAC Acoustics UK Ltd., established in 1949 and headquartered in Chandler's Ford, England, operates as a supplier specializing in engineered noise and acoustic control solutions. The company offers a range of products, including powertrain anechoic chambers, hearing screening booths, standard acoustic booths, industrial acoustic barriers, and industrial absorption panels. These solutions are applied across various sectors, such as aerospace, commercial construction, healthcare, industrial engineering, and transport. The company collaborates with partners including Welan Technologies, IAC Ltd., Panda Medical Limited, Amplivox, and MARVINACUSTICA.
ACA Tmetrix Inc., established in 1959 and based in Canada, is a distributor of test and measurement instruments and design tools. The company offers oscilloscopes, RF, EFC compliance tools, semiconductor testing, analyzers, meters, and probes. With a purpose, "Together to Measure Your Innovation," it connects Canadian professionals with global tech experts for test and measurement support. It fosters client innovation through expert training seminars and tailored engineering solutions. More than a distributor, the company provides comprehensive services like calibration, repair, technical support, warranty assistance, and guidance in electrical safety certifications.
Ranking as of April 2024
Derivation MethodRank | Company | Click Share |
---|---|---|
1 | O'Neill Engineered Systems, Inc. |
13.7%
|
2 | ETS-Lindgren |
8.5%
|
3 | IAC Acoustics |
6.6%
|
4 | Holland Shielding Systems BV |
5.2%
|
5 | MGV |
4.7%
|
6 | Testups Ireland Limited |
4.2%
|
7 | DongGuan JingHuan Eenvironment Equipment Co,.Ltd |
3.8%
|
8 | E&C Anechoic Chambers nv |
3.8%
|
9 | Faraday Defense Corp. |
3.8%
|
10 | Isotech, Inc. |
3.8%
|
Derivation Method
The ranking is calculated based on the click share within the anechoic chamber page as of April 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
Country | Number of Companies | Share (%) |
---|---|---|
United States of America | 6 | 20.7% |
India | 5 | 17.2% |
Japan | 5 | 17.2% |
United Kingdom | 5 | 17.2% |
Canada | 2 | 6.9% |
Belgium | 1 | 3.4% |
Netherlands | 1 | 3.4% |
France | 1 | 3.4% |
Ireland | 1 | 3.4% |
China | 1 | 3.4% |
Germany | 1 | 3.4% |
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