THz/mmWave-Based Intelligent Reflecting Surface (IRS/RIS) and RIS Controller

Telecom & ICT
1

Hi Experts.

Does anyone know how to build a THz / mmWave-based Intelligent Reflecting Surface (IRS/RIS), particularly the RIS controller?

Admin note: this post was updated with image below.
RIS system

2

In theory RIS would be made using 3 layers:

  • Outer Layer: or where the reflecting elements are placed it adjusts the phase, amplitude, or polarization of the incident waves to steer them in the desired direction.

  • Middle Layer: used in the middle to prevent signal leakage and ensure energy is not dissipated or lost in other directions.

  • Bottom/Last Layer: The last layer of the RIS dynamically adjusts reflection coefficients (phase and amplitude) for each element controlled by an FPGA.

3

Thanks!

What about building such a RIS system?

IRS is becoming a hot topic in mmWave and THz communication for 6G, as it enables enhanced throughput in urban areas with coverage challenges.

4

Are you looking for an active RIS or a passive RIS?

5

Passive RIS.

6

Some example:

RIS system

In theory, efficient RIS gain could be achieved if we manage to maintain a coherent summation at the receiver (UE), somewhat similar to what is done in an MRC (Maximal Ratio Combining) system.