Wideband anechoic box suitable for development of multi-band/UWB radio system or EMC evaluation


Demand on launching wideband radio test environment for development of multi-band/UWB radio system or EMC evaluation at low cost has became to increase. Such environment using anechoic box contributes to reduce initial cost of launching and shorten TAT(turn around time) by debugging easily a product to be tested.


Wideband anechoic box with high uniformity inside, consisting of shield box and wave absorber with suitable properties, is offered.

The following is an example that electric field at each of four points in a vertical plane of the distance 0.6 m from a transmitting antenna in an anechoic box was measured by a electric field probe.

  • Conditions

    Measurement frequency band
    • 1GHz to 6GHz
    Anechoic box
    • Size: about 1m x 1m x 1m
    • Shielding effect: more than 60 dB @ 2.4 GHz
    • Pyramid-type wave absorber(Reflectivity:-20 dB @ more than 1.5 GHz)
    Transmitting antenna
    • LPDA(Log PeriodicAntenna)
      [Calculation method of electric field strength(cal_E)]
    • Electric field strength is calculated from antenna input power, antenna gain(typ) and attenuation in free space.
  • Figure:An image of anechoic box inside
Graph:Measured electric field in an anechoic box

In above figure, variation of measured electric field at each point is within ±15 % at the frequencies over 1.5 GHz.

Also, good agreement of the calculated and the measured shows that anechoic box inside is similar to free space in a wide band.

System configuration

Signal analyzer [MSA558]
Electromagnetic anechoic box
Transmitting/Receiving antenna
Jigs to mount antenna and EUT
Others(PC, I/F modules, cables, etc)

Products introduction

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