Table 2 Fitting parameters of BK and ER models for different materials

From: Diffuse scattering measurements and mechanism analysis at 8, 12, and 28 GHz for typical building surfaces

Material

Model

Fitting parameters

SMAPE

  

ϵr

hrms (mm)

αR

αi

Λ

T (mm)

 

Marble wall

ER Directive model

6.1

1.1

1

-

-

-

0.3265

 

BK model

6.2

1.0

-

-

-

5.0

0.2905

Smooth wall

ER Directive model

6.0

4.2

3

-

-

-

0.3514

 

BK model

5.7

4.1

-

-

-

0.8

0.2833

Brick wall

Backscattering lobe model

10.1

8

1

4

0.8

-

0.3008

 

BK model

11.5

6.5

-

-

-

2.1

0.2168

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