I. INTRODUCTION
With the development of the mobile communication
industry, GSM mobile phones could be seen everywhere,
which leads to a constant increase of RF noises we don’t need.
If electronic circuits don’t have the ability to resist RF noises,
these RF noises would leads to distortion of the results. To
make sure of the reliable work of electronic circuits, the
measurement of RF noise filtering capability is a necessary
part in the design of production. This paper introduces a
universal integrated circuit RF noise filtering capability
measurement method—RF anechoic chamber, describes its
component, and gives a realistic example.
At present, the majority of nest telephone systems adapt
the TDMA (Time Division Multiple Address), which
modulates 217Hz frequency carrier with passes/breaks the
impulse modulation. Integrated circuit (IC) which is easily
disturbed by RF signals could demodulate the carrier, resulting
in 217Hz signal and its higher harmonic wave component.
Since the vast majority of signals are in voice band (300Hz-
3400Hz) , users would hear unwanted noises. In conclusion,
bad IC could demodulate RF signals from nest telephones,
bringing about low frequency noise[1].
To survey the quality of products, we need to put the circuit
under a certain RF environment, which equals to the
environment when the circuit normally works[2]. This paper