Path Loss (L P ); Table 2. Typical Coaxial Loss For Common Cable Types - ADTRAN TRACER 4106 Plan A System Manual

TRACER 4106/4206 System Manual
Table 2 gives typical loss figures for some of the more common coaxial cable types (per 100 feet).

Table 2. Typical Coaxial Loss for Common Cable Types

Cable Type
RG58
RG8 (air)
RG8 (foam)
1/4" Coax
3/8" Coax
1/2" Coax
5/8" Coax
7/8" Coax
1 1/4" Coax
1 5/8" Coax
5.8 GHz Elliptical Waveguide
Path Loss (L )
P
Path loss is the estimated attenuation between the transmit and receive antennas caused by signal
separation and scattering. The path loss is considered basic transmission loss over the microwave link. The
following expression calculates path loss:
where
f carrier frequency (Hz)
λ
carrier wavelength (c / f) (meters)
d path distance (meters)
c speed of light, free-space (meters)
or
L P =
where d is expressed in miles and f in GHz
Path loss, as shown here, increases rapidly as either the path length increases or the carrier wavelength
decreases (which happens as the carrier frequency increases). Therefore, longer microwave paths naturally
experience more path loss than shorter paths. Likewise, higher frequency microwave communication
experiences more path loss than lower frequency microwave communication.
612804206L2-1A
π π
 2
 
4 d 4
--------- - ----------- -
L P = =
  
λ
⋅
20 log 10 d ( )
96.6 + +
© 2004 ADTRAN, Inc.
Section 2 Microwave Path Engineering Basics
2.4 GHz Loss/100 ft.
(in dB)
80
20
9
5.91
5.76
3.83
2.98
2.2
1.62
1.41
N/A
 2
df
(dB)

c
f ( )
20·log
(dB)
10
5.8 GHz Loss/100 ft.
(in dB)
N/A
N/A
N/A
11.36
9.65
6.49
4.90
N/A
N/A
N/A
1.23
19