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Shielding box (electromagnetic anechoic box)
ME8661A
Optimum for testing W-CDMA, CDMA, GSM, PDC, PHS, ETC and
wireless systems. A receiving antenna of your choice will be mounted.
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| This is a simple type shielding box that may be used on a desk. It is of
triple structure, i.e., radio wave absorber, copper plate and aluminum
plate. It covers the frequency band of low frequency through 18GHz. Furthermore,
an acrylic resin table for placing a test sample is provided, and this
structure permits easy mounting of an optional receiving antenna. |
 Structure of shielding box |
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830 (W) × 608 (H) × 503 (D) mm |
| Applications |
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With a W-CDMA, CDMA, GSM, PDC, PHS, OBE of ETC, wireless LAN, Bluetooth
and wireless communication equipment, it is possible to test the wireless
system in a free space that is close to actual working conditions (testing
of transmission power, transmission frequency, spurious, occupied bandwidth,
carrier-off leakage power, adjacent channel power, modulation factor, transmission
eye pattern, etc.).
This wireless system test is done in the state where a test sample is placed
on the acrylic resin table (200 mm × 200 mm) in ME8661A as shown
above, a receiving antenna is mounted in a position that is opposed to
the test sample the output of a receiving antenna is connected to a spectrum
analyzer, microwave wattmeter or the like. Therefore, an optional receiving
antenna is needed for conducting this test. Two optional receiving antenna
models, i.e., Model A and Model B, are available. It is, however, also
possible to mount an antenna of different specification, if the frequency
band and polarization are appropriately specified. A distance of 30 cm
or greater may be provided between the test sample and the receiving antenna.
An optional reference antenna is used for calibration of RF coupling degree
(loss between front face of test sample and SMA connector of receiving
antenna output). Antenna gain and frequency characteristics data of RF
coupling degree are appended to this reference antenna. Although the antenna
itself is the same whether a reference antenna or a receiving antenna,
a reference antenna is provided with a fixing stand made of acrylic resin,
so that it can be placed on the acrylic resin table.
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Reference antenna A |
Frequency range : 2 to 18GHz
Antenna gain : -2 to +6dBi (with data)
VSWR : less than 2.0
Polarization : Right circular
Max. input power : 1W @ CW
Application : For OBE of ETC
*Receiving antenna model A is
same specifications as above
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Reference antenna B |
Frequency range : 2 to 5GHz
Antenna gain : +12.5 to 17dBi (with data)
VSWR : 1.4 (typ.), 3.0 (max.)
Polarization : Linear
Max. input power : 200W @ CW
Applications : Cellular phone, PHS
*Receiving antenna model B is
same specifications as above
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Connect a signal source to the reference antenna connector and connect
a measuring instrument to the receiving antenna connector. Having done
this, antenna characteristics data can be acquired.
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Electromagnetic anechoic box |
Capable of using as a mere electromagnetic anechoic box without mounting
antenna. It is optimum for simple preliminary experiments for EMC testing
and when it is wanted to conduct a test shielded from the external magnetic
field. |
| Specifications |
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Shielding characteristics
Reflection loss
Outside dimensions
Inside dimensions
Structure
Weight
Acrylic resin table
Connectors |
≧50dB@2.4GHz
≧20dB@1.2GHz〜
830 (W) × 608 (H) × 503 (D) mm
700 (W) × 380 (H) × 380 (D) mm
Triple structure composed of radio wave absorber, copper plate and aluminum
plate
approx. 38kg (excluding antenna)
200 × 200 mm
SMA (3pcs) (reference side 1pc, receiving side 2pcs)
25 pins D-sub connector 1pc |
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Optional |
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• Receiving antenna model A
• Reference antenna model A (with antenna gain and RF coupling degree data)
• Receiving antenna model B
• Reference antenna model B (with antenna gain and RF coupling degree
data)
• Microwave coaxial cable (0.5m)
• Microwave coaxial cable (3m)
• Microwave coaxial cable (4m)
• Fixed microwave attenuators (1 to 10, 12, 13, 15, 20dB)
• 50ohm termination |
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