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Use of coaxial cables in WLAN systems
Original Polish version by Lukasz Sawicki
The range of wireless network depends on many factors. The user has influence on some of them, others cannot be changed in a specific environment. The main factors are:
  • factors connected with the features of the devices used:
    • output power
    • attenuation of cables
    • gain of antennas
    • sensitivity
  • external conditions:
    • attenuation between antennas (it can be assessed using FSL model)
    • interferences coming from other systems/devices (they cannot be assessed - it is only possible to reserve some power margin to overwhelm them)
    • existing physical obstacles (walls, ceilings, trees etc.)
The loss of power in the cable can be reduced by using coaxial cables working up to 6 GHz. Their attenuation at 2.4 GHz is considerably lower than that of typical cables used in this band.In 2006, DIPOL launched modern Tri-Lan cable family.Main features of Tri-Lan cables:
  • low attenuation (so much as 20% lower than in the case of H-155, or H-1000)
  • perfect impedance matching
  • high screening efficiency (90dB at 2.4GHz)
  • PE sheath resistant to UV radiation (Borealis LE 8707 - plastic from renown producer), which allows to use the cables outdoors.
Coaxial Cable 50 ohm: Tri-Lan 240 [1m]
Coaxial Cable (50 ohm): Tri-Lan 400 WLL [1m]
The details of Tri-Lan 240 cable
The details of Tri-Lan 400 cable

Copper core

Diameter

1.4 mm

Mechanically foamed dielectric

Outer diameter

3.8 mm

Shielding

Al foil/Polyester/Al foil:

12/15/12 um

Covering factor

100 %

CuSn braid

16x7x0.12

Covering factor

80 %

Outer diameter

4.45 mm

Sheath

Material

PE

Outer diameter

6.10 mm

Color

black

Electrical parameters

Impedance

50 ohm

Capacitance

83 pF/m

Wave reduction factor

81 %

Screening efficiency

>90 dB

Resistance of the core

11.2 ohm/km

Resistance of the shielding

12.4 ohm/km

Other parameters

Minimum bending radius

30/60 mm

Weight

47 kg/km

Operating temperature

-40 to +70 deg C

Copper core

Diameter

2.7 mm

Mechanically foamed dielectric

Outer diameter

7.2 mm

Shielding

Al foil/Polyester/Al foil:

25/12 um

Covering factor

100 %

CuSn braid

24 x 7 x 0.15

Covering factor

83 %

Outer diameter

7.95 mm

Sheath

Material

PE

Outer diameter

10.3 mm

Color

black

Electrical parameters

Impedance

50 ohm

Capacitance

80 pF/m

Wave reduction factor

83 %

Screening efficiency

>90 dB

Resistance of the core

3.1 ohm/km

Resistance of the shielding

5.8 ohm/km

Other parameters

Minimum bending radius

50/100 mm

Weight

149.2 kg/km

Operating temperature

-40 to +70  deg C

In the 2.4 GHz band there can effectively operate (in the specific location) only 3 wireless networks. Popularity of WLAN technology is the reason that the needs are higher. The only solution for coexisting a larger number of WLANs is migration to 5 GHz band. The currently used coaxial cables Belden H-155 or H-1000 are not suitable for this change, especially H-155 - with stranded inner conductor. Its good equivalent allowing migration to 5 GHz band is Tri-Lan 240 E1171_100, with solid copper wire. It is very important difference strongly influencing parameters in the 5 GHz band. Below we show table comparing the two cables.

Data compared

Type of cable

Name

Tri-Lan 240

Belden H-155

Inner conductor

1.4 mm/solid wire (Cu)

1.35mm (19x0.28mm)/stranded conductor (Cu)

Capacitance [pF/m]

83

82

Screening efficiency [dB]

>90

>81

Inner conductor resistance [ohm/km]

11.2

15

Outer conductor resistance [ohm/km]

12.4

32

Attenuation [dB/100m]

1000 MHz

24.6

30.9

2400 MHz

39.8

49.6

5500 MHz

63.5

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More technical details of Tri-Lan cables can be found on the catalog pages
Tri-Lan 240 E1171_100 and Tri-Lan 400 E1173_100