TV band reception is between 470 MHz - 800 MHz , while 4G LTE band is 698 Mhz - 960 Mhz for Uplink and 1710 MHz - 2690 MHz for Downlink.
So, TV band reception will interference at 698 MHz - 800 MHz with 4G LTE band, there is Gap Frequency about :
800 MHz- 698 MHz = 102 , to solve this we must design filter for this gap frequency. We used Band Reject filter between 698 MHz - 800 MHz , with centre frequency :
Centre Frequency = (102/2) + 698 MHz = 51 + 698 = 749 MHz
Illustration for this :
470 MHz===================800 MHz TV Band
++++++++ Gap Frequency / Overlapping frequency
698 MHz===============960 MHz ( 4G LTE Band)
Design Filter :
From using this Band Rejection calculator , we found the design calculation :
There are 2 circuit model, you can choose one of it
