How to minimize the carrier loop in a concentrator?

The larger the loop area of the concentrator carrier communication loop (coupling transformer, matching network), the easier it is to pick up spatial interference and radiated noise. Minimizing the loop area is key to improving the carrier signal-to-noise ratio. The corresponding pins of the coupling transformer, matching capacitor, and carrier chip should be grouped together, making the connection traces between them as short and direct as possible. Carrier signal lines (such as TX, RX) should be in differential pairs, routed closely in parallel on the PCB, ideally on adjacent layers and aligned vertically. A complete ground plane should be provided below the trace from the transformer secondary to the carrier chip as a return plane. Twisted-pair cables should be used for connections from external coupling terminals to the transformer, and they should be as short as possible. Through careful design, the loop area of the carrier loop can be reduced from tens of square centimeters to a few square centimeters, thereby reducing spatial magnetic field induced noise by more than 15dB and improving carrier receiver sensitivity.