One of the most important modern systems used in wireless communications is the intelligence reflective surfaces. Are there filters used with these surfaces?
The IRS elements are acting as filters, which phase-shift the signals before they are re-radiated. This is the way of describing the technology that we are utilizing in this paper:
https://arxiv.org/pdf/2102.00742
The use of filters improves performance by taking advantage of the degree of diversity through using multiple intelligence reflective surfaces (IRS).
Dear Abbas
Adding to the respected colleagues, the IRS are made of a two dimensional array of sub wavelength patches provided by pin or varactor diodes such that one can phase shift and control the amplitude of the reflected wave from each patch.
One can control the phase shift by changing the diode bias. The diode is sufficient to change the phase shift from 0 to pi.
Where you want to insert the filter and why?
For more information please refer to the presentation in the link:https://www.ltu.se/cms_fs/1.203003!/file/Emad%20Ibrahim.pdf
Best wishes
ISR will have the function of the spatial filter. The function of frequency filters will be better to use in an active ISR, because in passive ISRs, the use of frequency filters will be accompanied by a loss of signal energy.
Yes. Please the details in thr following article link:
https://arxiv.org/pdf/1907.04789.pdf
Dear Abbas,
you can find the answer in this article:
Wireless Communications Through Reconfigurable Intelligent Surfaces
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