Semi anechoic chambers

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Anechoic chambers

Controlled Electromagnetic Environments

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Anechoic chambers . . . . . . . . . . 03

Semi anechoic chambers (EMC) . . . 03

3m semi anechoic chamber . . . . . 05



Compact anechoic chamber . . . . . 08

Full anechoic chamber . . . . . . . . 09

Anechoic chamber for automotive

testing (components) . . . . . . . . . 10

Anechoic chamber for automotive

testing (full vehicle) . . . . . . . . . 11

Anechoic chamber for

Mil-Std / Tempest testing . . . . . . 12

Antenna pattern measurement

rooms / Antenna test ranges . . . . . 14

ControllEdElEctromAgnEticEnvironmEnts

Comtest Engineering supplies high performance

RF shielded rooms, reverberation and anechoic

chambers . The company is located in The

Netherlands and was founded in 1985 .

We are a professional organization and recognized for our

quality and flexibility. Comtest high performance RF shielded

doors, mode-stirrer systems and microwave absorbers have been

internationally recognized as state of the art products.

Our skilled and experienced team is dedicated to satisfy your need

to control the electromagnetic environment!

Comtest Engineering b.v. Industrieweg 122382 NV ZoeterwoudeThe Netherlands Phone: +31 (0)71 5417 531E-mail: [email protected]

ISO9001

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Anechoic chambers

An anechoic chamber is a RF shielded room whose

walls and ceiling have been covered with microwave

absorbers that scatter or absorb so much of the incident

energy that it can simulate free space. The anechoic

chamber is typically used to house the equipment for

performing measurements of antenna radiation patterns,

electromagnetic compatibility (EMC) and radar cross

section (RCS) measurements. Testing can be conducted

on various electronic devices, vehicles, aircraft, or

spacecraft. Semi anechoic chamber constructions are

designed for radiated emission and immunity testing.

Microwave or antenna test chambers are designed to

perform measurements of antenna characteristics.

Comtest Engineering can design and supply the

following (standard) anechoic chamber solutions:

• Compact (semi / full) anechoic chamber

• Semi anechoic chamber, test distance: 3m, 5m, 10m

• Anechoic chamber for automotive testing

(components / full vehicle)

• Anechoic chamber for MIL-STD / Tempest testing

• Antenna pattern measurement room

• (compact) Antenna test range

Semi anechoic chambers (EMC)

The main purpose of a semi anechoic chamber is to

perform measurements of radio frequency emission

or immunity from electronic products at 3,5 or 10mtr

measurement range length. The combination of the pan-

type 2mm galvanized panel system and the polystyrene

hybrid absorber solution on the walls and ceiling

eliminates unwanted electrical noise and complies with

international emission and immunity test standards.

The semi anechoic chamber is a multi functional

test environment for commercial, military, R&D and

automotive testing.

Features of a typical semi anechoic chamber:

• Full compliance emission test site for frequency

range of 30MHz to 18GHz as per CISPR 16-1-4

• Full compliance immunity test site for frequency

range of 80MHz to 6GHz as per IEC/EN 61000-4-3

• Shielding effectiveness according to EN 50147-1

up to 40GHz

Typical performance of a semi anechoic chamber:

• NSA: +/- 4 dB

• FU: 75% of 16 points comply with +6 dB

requirements

• sVSWR: below 6 dB

Options for a (semi) anechoic chamber:

• An additional RF shielded room can be installed to

house high power RF amplifiers (amplifier room) or

control and test equipment (control room).

• Video and audio monitoring system

• Various fibre optic converter systems for USB and

Ethernet.

• EUT test table

• Various special positioning equipment

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Applicable standards / test methods for semi anechoic chambers:

Radiated emissions Radiated immunity

EN 61000-6-3 IEC/EN 61000-4-3

EN 61000-6-4 EN 61000-6-1

CISPR 11 / EN55011 EN 61000-6-2

CISPR 12 / EN55012 EN 55020

CISPR 13 / EN55013 EN 55024

CISPR 14 / EN55014 Mil-Std 461-F (RS section)

CISPR 15 / EN55015 DO-160-G

CISPR 16-1-14

CISPR 22 / EN55022

FCC part 15

CISPR 25

Mil-Std 461-F (re section)DO-160-G

Various ETSI standards

ANCI C63.4

Anechoic chamber for automotive components testing

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The main purpose of a 3m anechoic chamber is to perform full compliance measurements of radio frequency

emission and immunity from electronic products at 3mtr measurement range length.

Dimensions: 8.55 x 5.55 x 5.775 (h) m

Shielding construction: 2mm hot galvanized shielding panels with a free standing structural steel support.

Absorbers: Hybrid solution of ferrite tiles and polystyrene hybrid absorber (model HT45) on walls and ceiling

Ventilation: Honeycomb model 1791-3030 (300 x 300mm / 18GHz)

Personnel Door: RF shielded swing door model 1766-1221 (1200*2100mm)

Wall entry panel: Model 1795-1530 (150x300mm) including RF connectors

EUT power line: Filtered 230VAC / 32A / single phase model 4801-032

Lighting: CDMT lights 70Watt model 1840-070

Frequency range: 30MHz to 18Ghz for radiated emission and 80MHz-6GHz for radiated immunity.

Test distance: 3m between centre of antenna and EUT

Test volume: 2 mtr

Floor: Raised ground plane with floor entry panels incl. RF connectors

Turn table: Fibre optic controlled turn table 2mtr

Antenna mast: Fibre optic controlled antenna mast

3m semi anechoic chamber model 1711-000

Typical specifications:

In addition to the typical specification of the 3m semi anechoic chamber we are able to tailor the chamber’s

specification to satisfy our customers’ individual requirements.

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Dimensions 11,40 x 6.60 x 5.775 (h) m




Personnel Door: RF shielded sliding door model 1752-1523 (1500*2300mm)



Lighting: CDMT lights 70Watt model 1840-070


Test distance: 5m and 3m between centre of antenna and EUT

Test volume: 3 mtr

Floor: Raised ground plane with floor entry panels incl. RF connectors

Turn table: Fibre optic controlled turn table 3mtr




emission and immunity from electronic products at 5mtr measurement range length.


In addition to the typical specification of the 5mtr semi anechoic chamber we are able to tailor the chamber’s


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emission and immunity from electronic products at 10 and/or 3mtr measurement range length.


Dimensions: 19.20 x 11.40 x 7,80 (h) m





EUT door: RF shielded sliding door model 1755-3030 (3000*3000mm) incl. lift platform.


EUT power line: Filtered 400VAC / 32A / three phase model 4803-032

Lighting: CDMT lights 150 W model 1830-150


Test distance 10m and 3m between centre of antenna and EUT

Test volume 4 mtr, single axis

Floor Raised ground plane with floor entry panels incl. RF connectors.Turn table: Fibre optic controlled turn table 4mtr


In addition to the typical specification of the 10mtr semi anechoic chamber we are able to tailor the chamber’s


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A compact anechoic chamber can be used for radiated

immunity test evaluations at 1m distance. For

products fitting into a square of 0,5 x 0,5m, these test

are in compliance with the EN61000-4-3 standard.

Additionally pre-compliance emission testing can be

executed in a repeatable environment.

Typical performance:Field Uniformity (FU): 4 of 4 points comply with

+6dB requirements

Features:

• Full compliance immunity test site for small

equipment at 1m distance

• Pre-compliance emission measurements at 1m distance

• Ferrite coverage on floor, walls and ceiling

• Quick scan emission measurements without

antenna height scan at 1m distance

• Partial hybrid absorber coverage at walls and ceiling

Dimensions: 4.050 x 3.600 x 2.929 (h)m.

Shielding construction: 2mm hot galvanized shielding panels with a structural steel support on the roof panels

Absorbers: Hybrid solution of ferrite tiles on floor, walls and ceiling and polystyrene hybrid absorber (HT45) on walls and

ceiling plus a set of floor absorbers


Door: RF shielded swing door model 1766-0921 (900*2100mm)




Frequency range: Radiated immunity testing from 80MHz- 6GHz / pre compliance emissions 30MHz – 18GHz

Test distance 1 m between centre of antenna and EUT

Field Uniformity 0,5 x 0,5 meter

Floor: Ferrite tiles and anti static carpet tiles

compact anechoic chamber model 1710-100


In addition to the typical specification of the compact anechoic chamber we are able to tailor the chamber’s

typical specification to satisfy our customers’ individual requirements.

Options:

• Free standing turn table 1,2 mtr to perform

pre-compliance emissions test

• Antenna stand with fixed height and automatic

polarization change

• Increase test distance to 2 or 3 mtr

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Dimensions 7.500 x 4.050 x 2.925 (h)m.

Shielding construction 2mm hot galvanized shielding panels with a structural steel support on the roof panels

Absorbers Hybrid solution of ferrite tiles and polystyrene hybrid absorber (model HT45) on walls, floor and ceiling

Ventilation Honeycomb model 1791-3030 (300 x 300mm / 18GHz)

Door RF shielded swing door model 1766-0921 (900*2100mm)

Wall entry panel Model 1795-3030 (300x300mm) including RF connectors

EUT power line Filtered 230VAC / 16A / single phase model 4801-016

Lighting CDMT light 70 W model 1840-070

Frequency range 30MHz-18Ghz

Test volume 1.2 mtr

Floor Full anechoic (ferrites and absorbers) incl. a walk way solution

Turn table Free standing turn table 1,2 mtr

Antenna mast Fibre optic controlled antenna mast

Full anechoic chamber model 1710-000

A full anechoic chamber can be used for radiated

emission test evaluations of electronics products and

especially telecom equipment.

Typical performance:CISPR 16-1-4 (2010) + annex A1 (2012): (free space)

NSA: +/- 6 dB / VSWR: below 6dB

ETSI TR 102 273-2 V1.2.1


In addition to the typical specification of the full anechoic chamber we are able to tailor the chamber’s typical


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Anechoic chamber for automotive testing (components) model 1714-000

Emissions Immunity

CISPR 12 / EN55012 ISO 11452

CISPR 25 SAE J1113 part 21

Automotive directive 95/54/EC

The main purpose of an anechoic chamber for

automotive testing is to perform measurements of radio

frequency emission or immunity specialized for vehicle

on board equipment testing. Testing at component

level verifies levels of emissions from individual car

components. The combination of the pan-type 2mm

galvanized panel system and the polystyrene hybrid

absorbers on the walls and ceiling eliminates unwanted

electrical noise and complies with international

emission standards for automotive testing.

Features:

• Noise floor level as per CISPR 25 requirements

• Grounded EUT test table as per CISPR 25 design guide lines

Applicable standards / test methods:

In addition to the above standards Comtest can design automotive test chambers according to specific guidelines

of individual car manufacturers.

Dimensions: 6.300 x 5.400 x 3.825 (h) m

Construction: 2mm hot galvanized shielding panels with a structural steel support on the roof panels

Absorbers: Ferrites and polystyrene hybrid absorber solution (model HT25) or model MT65 absorbers on walls and ceiling






Frequency range: 70MHz – 2.5GHz

Floor: Conductive metal ground plane

Table support: RF-grounding connections to the shield wall or floor for test table connection

Typical performance:

• Absorber return loss of 6dB minimum between 70MHz and 6GHz


In addition to the typical specification of the semi anechoic chamber for automotive testing we are able to tailor

the chamber’s specification to satisfy our customers’ individual requirements.

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Anechoic chamber for automotive testing (full vehicle) model 1714-100

The main purpose of an anechoic chamber for full

vehicle automotive testing is to perform measurements

of radio frequency emission or immunity specialized

for full vehicle testing. Testing at full vehicle level

verifies effects of emissions from car-mounted

components on on-board receivers. The combination

of the pan-type 2mm galvanized panel system and the

polystyrene hybrid absorbers on the walls and ceiling

eliminates unwanted electrical noise and complies with

international emission standards for automotive testing.

Features:

• Noise floor level as per CISPR 25 requirements

In addition to the above standards Comtest can design automotive test chambers according to specific guidelines

of individual car manufacturers.

Typical performance:• Absorber return loss of 6dB minimum between 70MHz and 6GHz

Emissions Immunity

CISPR 12 / EN55012 ISO 11451-2

CISPR 25 ISO 11451-3

Automotive directive 95/54/EC SAEJ551 part 11&12

SAEJ551 part 11&12


Dimensions: 12,00 x 7,50 m x 3.925 (h) m


Absorbers: Ferrites and polystyrene hybrid absorber solution (model HT25) or model MT65 absorbers on walls and ceiling


Special gas-exhaust for engine fumes

EUT door: RF shielded sliding door model 1754-2424 (2400*2400mm)


EUT power line: Filtered 400VAC / 63A / three phase model 4803-063


Frequency range: 70MHz – 2.5GHz

Floor: Conductive metal ground plane (heavy load)


In addition to the typical specification of the anechoic chamber for full vehicle testing we are able to tailor the

chamber’s specification to satisfy our customers’ individual requirements.

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Anechoic chamber for mil-Std / tempest testing model 1715-000

This type of test chamber is designed for testing against

international test procedures such as MIL-STD 461, DO-

160 and Tempest SDIP. Measurement instrumentation

such as Tempest receiver systems, MIL-STD test tables

and wideband antennas as well as LISN instrumentation

for conducted testing procedures can be provided as a

turnkey solution.

Features:• Absorber layout in accordance to MIL-STD 461 / DO-160

• Absorber return loss compliant with MIL-STD 461 / DO160 requirements

• Both suitable for radiated and conducted testing


• MIL-STD 461E/F

•RE-101

•RE-103

•RE-105

•RS-101

•RS-103

•RS-105

• DO-160

• Tempest SDIP

Typical performance:

• Absorber return loss of 6dB minimum between 80

MHz to 250MHz

• Absorber return loss of 10dB minimum from

250MHz up.

A MIL-STD test chamber is designed in full compliance

to the MIL-STD 461 standard set-up including a test

table and inner clearances regarding the absorbers and

the test table.

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Dimensions: 6.000 x 5.250 x 2.925 (h) m


Absorbers: Polystyrene absorber solution (model MT65) partly lined to walls and ceiling.



Wall entry panel: Model 1795-3030( 300x300mm) including RF connectors



Floor: Conductive metal ground plane

Table support: RF-grounding connections to the shield wall for test table cover connection


In addition to the typical specification of a MIL STD test chamber we are able to tailor the chamber’s specification to

satisfy our customers’ individual requirements.

Options:

• MIL- STD test-table incl. conductive brass cover (model 1410-000) and sufficient connection strips.

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Antenna pattern measurement rooms / Antenna test ranges

The main purpose of a microwave full anechoic

chamber is to perform measurements on antenna

pattern characteristics or radar systems. The

combination of the pan-type 2mm galvanized panel

system and the polystyrene absorber solution on

the walls, floor and ceiling eliminates unwanted

electrical noise and creates a controlled RF test

environment.

Comtest Engineering can design and supply the

following microwave full anechoic chamber solutions:

• Antenna Pattern Measurement chamber

• (compact) Antenna Test Range

• Radar Cross Section chamber

Microwave anechoic chambers, differently from

EMC chambers, don’t follow a standard approach.

Each antenna chamber is a tailored to the specific

requirements of the customer.

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Please also view our other literature or visit our website: www .comtest .eu

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Hybrid & MicrowaveAbsorbers


1

Reverberationchambers


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RF Shieldeddoors


1

RF Shielded rooms


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Reverberation, Anechoic chamber and RF shielded room accessories


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www.comtest.euComtest Engineering b.v. Industrieweg 122382 NV ZoeterwoudeThe Netherlands Phone: +31 (0)71 5417 531E-mail: [email protected]

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Semi anechoic chambers