[REQUEST] RF multirange block circuit

[andre_luis]

Hi friends,


I wish build a RF circuit to block a wide range of frequencies, basically :

400- 800 Mhz ( RF ID )
801mhz 890MHz ( Bluetooth, ZigBee, Wimax)
900-1100MHz ( GSM CDMA)
1100MHz- 1800MHz ( GPS receiver )
1800MHz-2000MHz (1G )
2000-2400MHz ( 2G )
2450-2500MHz ( 3G )
2.5GHz-2.7GHz ( 3.5 / 4G )

Somebody could give some sugestion about how to do that ?
It is not problem, if will be needed to use many antenas at same case.

The range in wich will be used is about 4m.


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[jiripolivka]

If you need to block each of the bands, find the design of band-reject filters and use it. If you need to reject all of the above bands at once, the best is to use a combination of high- and low-pass filters like those used in cable TV to reject wide band signals.
To do any of the above you must specify the degree of rejection in dB.

 

[andre_luis]

jiripolivka,


What is needed exactly is design a circuit able to interfere in reception of all equipments in a range of 4 meters from the target point.
I was thinking about to generate a set of neighbor carriers with low Q factor, and mix in order to block all those bands.

Is thap approach correct, or there are other ways to reach the result ?


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[jiripolivka]

I still do not see what you exactly need. If you want to introduce interfering signals into existing equipment, there is a methodology for it by CISPR, google it. Otherwise, use my above advice.