Wideband field uniformity in anechoic box
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.
[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.
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.
|Signal analyzer [MSA558]|
|Electromagnetic anechoic box|
|Jigs to mount antenna and EUT|
|Others(PC, I/F modules, cables, etc)|
*MICRONIX Corporation reserves the right to make changes in design, specification and other information without prior notice.
REAL TIME + SWEEP system
Handheld signal analyzer MSA558
Measurement frequency:20kHz to 8.5GHz. Almost all of the applications of wireless communication systems are covered.
Electromagnetic anechoic box/Shield box
High quality & high reliability anechoic chamber the measuring instrument manufacturer offers.