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Can you filter the radio frequency signals used in computer wireless communication, like you filter water?

Can you filter the radio frequency signals used in computer wireless communication, like you filter water?

For instance, you want to transmit data wirelessly in a factory but there is a numbers of things that will cause Wi-Fi interference, so I will need a device that will capture all the signals, and discard the non-essential data. Like separating different musical tunes.
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John
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Dr. Klahn

No.  Classical filters twist signal phase 45 degrees at the corner frequency for every pole in the filter. An ideal (unit step) frequency filter would have infinite phase twist at the corner frequency and enormous distortion within the passband.

https://www.analog.com/en/analog-dialogue/articles/phase-relations-in-active-filters.html

"The 802.11b radio link uses a direct sequence spread spectrum technique called complementary coded keying (CCK). The bit stream is processed with a special coding and then modulated using Quadrature Phase Shift Keying (QPSK).

The 802.11a and g systems use 64-channel orthogonal frequency division multiplexing (OFDM). In an OFDM modulation system, the available radio band is divided into a number of sub-channels and some of the bits are sent on each. The transmitter encodes the bit streams on the 64 subcarriers using Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), or one of two levels of Quadrature Amplitude Modulation (16, or 64-QAM)."


These modulation schemes are critical with regard to phase.  By the time a sufficiently sharp filter edge was obtained to be of any use, the signal phase would be distorted to a point where the signal is unrecognizable.

"If it were possible, somebody would already be doing it."
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Overall I agree with the above and that is why I selected an article with troubleshooting steps for common interference
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Thank you, all for your time.
You are very welcome