Table 1 Comparison between this work and the conventional RISs

From: A filtering reconfigurable intelligent surface for interference-free wireless communications

Ref.

Type

f0 (GHz)

Operating BW (GHz)

BW3dB (GHz)

BW20dB (GHz)

BW/BW3dB

Q factor

K20dB

This work

Rx. - Fun. - Tx.

3.5

0.24 (6.9%)

0.25 (7.1%)

0.32 (9.1%)

96%

14

1.3

mmWave RIS (Simulated)

Rx. - Fun. - Tx.

28.5

3.6 (12.6%)

4.0 (14.0%)

5.6 (19.6%)

90.0%

7.1

1.4

[41]

Rx. - Tx.

5.0

0.5 (10.0%)

1.0 (20.0%)

2.0 (40.0%)

50.0%

5.0

>2.0

[42]

Rx. - Tx.

32.0

4.3 (13.4%)

4.9 (15.3%)

10 (31.2%)

87.8%

6.5

2.0

[46]

Stacked 5-Layers

5.4

0.2 (3.7%)

0.9 (16.7%)

1.1 (20.4%)

22.2%

6.0

1.2

[46]

Stacked 5-Layers

5.4

0.1 (1.9%)

0.7 (13.0%)

0.9 (16.7%)

14.3%

7.7

1.3

  1. f0, center frequency; BW bandwidth; BWndB, n dB bandwidth; Q factor, quality factor, the ratio f0/BW3dB; K20dB, rectangle coefficient, the ratio BW20dB/BW3dB; Rx., receiver; Fun., functional module; Tx., transmitter.