Re: Question on TX-RX leak in UHF RFID Reader
时间：04-09
整理：3721RD
点击：
Hi,Everyone!
This is my first post here.
Thanks for your attention.
Here goes my confusion.
In the UHF RFID reader, there would be a Circuloator or directional coupler
which isolates the TX from RX.However the isolation would be 30dB as a reasonable value.
Assume the TX power is 30dBm,then the TX-RX leak is 0dBm or so.At the same time, the desired signals backscattered from the tag is much less than the value, say -30dBm or so.Here we call the TX-RX the main part of the noise,which may make the devices behind jammed. Is there anything wrong in my statement?Pls don't hesitate to comment on this.
Then I'm wondering that is there a solution to it?
To enhance the isolation of the circulator ?
Is there any software methods to solve this problem?
Thanks in advance!
francis
Added after 2 minutes:
Because the frequency of TX-RX is the same as that of the desired signal, but the desired signal is coded in form of FM0.The desired signal is definately different from TX-RX in the perspective of frequency domain.
I'm not sure the two can be sepaperated, or the TX-RX could be depressed.
This is my first post here.
Thanks for your attention.
Here goes my confusion.
In the UHF RFID reader, there would be a Circuloator or directional coupler
which isolates the TX from RX.However the isolation would be 30dB as a reasonable value.
Assume the TX power is 30dBm,then the TX-RX leak is 0dBm or so.At the same time, the desired signals backscattered from the tag is much less than the value, say -30dBm or so.Here we call the TX-RX the main part of the noise,which may make the devices behind jammed. Is there anything wrong in my statement?Pls don't hesitate to comment on this.
Then I'm wondering that is there a solution to it?
To enhance the isolation of the circulator ?
Is there any software methods to solve this problem?
Thanks in advance!
francis
Added after 2 minutes:
Because the frequency of TX-RX is the same as that of the desired signal, but the desired signal is coded in form of FM0.The desired signal is definately different from TX-RX in the perspective of frequency domain.
I'm not sure the two can be sepaperated, or the TX-RX could be depressed.