Electromagnetic anechoic chamber with an inner electromagnetic wave reflection surface and an electromagnetic wave absorption small ball disposed in the chamber

An electromagnetic anechoic chamber for providing a closed space for containing an electromagnetic device emitting an electromagnetic wave therein, an echo of the electromagnetic device being suppressed within said closed space, said electromagnetic anechoic chamber comprising:

• an electromagnetically shielding wall having an inner surface of a substantially ellipsoidal shape with a first and a second focus point, said inner surface defining said closed space and reflecting said electromagnetic wave into said closed space as a reflected wave;
• electromagnetic absorption means located at said first focus point for absorbing said reflected wave to thereby remove the reflected wave from said closed space;
• and
• receiving means located between said first and said second focus points for receiving said electromagnetic wave, said second focus point being determined as a specific point at which said electromagnetic device is located.