Guidelines for signal routing near an antenna array

G

Gilad

The task at hand is connecting multiple RFID (13.56Mhz) antennas in an array. Each antenna works on its own and access to it is by SPI. Only one antenna is active at a given moment.

The technicals:

  1. Signal Voltage: 5V
  2. RFID Freq: 13.56Mhz
  3. SPI Frequency: 100kHz is OK, 1Mhz is better.
  4. Antenna: PCB antenna, 60mm x 35mm. there is a gap of 3mm between each antenna.
  5. The antennas and SPI routing are on different PCBs.

What would be the correct way to route the signals under the antennas so they 'absorb' as little of the RF signal as possible? For product design reasons it is not possible to route the signals around the antennas or a far distance (more than 3mm) below them.

Should the signals be routed between (blue) the antennas (there is a 3mm gap) or through the center (red) of the antennas?

enter image description here
 

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