Spacers for Omnidirectional Antennas

Antennas with a radiation characteristic of 360° are used in different fields of radio application. Such antennas usually are known as “omnidirectional antennas” (omni antennas). Typical applications of omnidirectional antennas in practice are private mobile radio (PMR) systems, safety nets and sometimes also GSM networks. In GSM networks, however, they are only applied if there is a low frequency of radio waves.

For omnidirectional antennas it has to be taken into account that metal structures in the direct vicinity have a negative, i.e. attenuating influence on the radiation characteristics. Hence, the father from the antenna, the lower the influence of these structures on the radiation characteristics.
Together with the Kathrein company in Rosenheim, Germany, DEHN carried out measurements for evaluating what kind and size of nearby metal structures interfere the radiation characteristics.

When installing an isolated air-termination systems at an omnidirectional antenna it has to be minded that an isolated air-termination rod provides a sufficient protective angle for the antenna to be protected. A sufficient separation distance s has to be kept as well.

Details

Figure 1: Exemplary design for an omnidirectional antenna length 1000 mm
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Figure 2: Exemplary design for an omnidirectional antenna, length 3000 mm
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Figure 3: Spacer – detail view
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Table
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Calculation of the wave length
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Spacer for DEHNiso Combi supporting tubes with HVI Conductor installed inside and/or outside the supporting tube, mounted on the antenna mast.

3 Products

Part No. 105363 AH D50 1000 D55.100 STTZN

GTIN 4013364106031, Customs tariff No. (EU): 85389099, Gross weight: 8.87 kg, PU: 1.00 pc(s)

Images

Additional information

Spacer for omnidirectional antennas, clamping range: 55-100 mm, St/tZn
Spacer for omnidirectional antennas for fixing the supporting tube construction to the antenna mast
For DEHNiso Combi supporting tubes with HVI power Conductor installed inside and/or outside the supporting tube
At least two spacers have to be mounted per supporting tube of the isolated air-termination system
Spacers are dimensioned according to Eurocode 1 (DIN EN 1991-1-4 + DIN EN 1991-1-4/NA)
Material of support / square profile: St/tZn
Clamping range (Ø mast): 55-100 mm
Clamping range of supporting tube: 50 mm
Length of spacer: 1000 mm
Dimensions: 140 x 120 x 55 mm

Brand: DEHN
Type: AH D50 1000 D55.100 STTZN
Part No.: 105363
or equivalent.

 

Technical data

Material of support / square profile St/tZn
Clamping range (Ø mast) 55-100 mm
Clamping range of supporting tube 50 mm
Length of spacer 1000 mm
Dimensions (w1 x h1 x d1) 140 x 120 x 55 mm

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Part No. 105364 AH D50 1000 D100.150 STTZN

GTIN 4013364106048, Customs tariff No. (EU): 85389099, Gross weight: 10.85 kg, PU: 1.00 pc(s)

Images

Additional information

Spacer for omnidirectional antennas, clamping range: 100-150 mm, St/tZn
Spacer for omnidirectional antennas for fixing the supporting tube construction at the antenna mast
For DEHNiso Combi supporting tubes with HVI power Conductor installed inside and/or outside the supporting tube
At least two spacers have to be mounted per supporting tube of the isolated air-termination system
Spacers are dimensioned according to Eurocode 1 (DIN EN 1991-1-4 + DIN EN 1991-1-4/NA)
Material of support / square profile: St/tZn
Clamping range (Ø mast): 100-150 mm
Clamping range of supporting tube: 50 mm
Length of spacer: 1000 mm
Dimensions: 190 x 140 x 60 mm

Brand: DEHN
Type: AH D50 1000 D100.150 STTZN
Part No.: 105364
or equivalent.

 

Technical data

Material of support / square profile St/tZn
Clamping range (Ø mast) 100-150 mm
Clamping range of supporting tube 50 mm
Length of spacer 1000 mm
Dimensions (w1 x h1 x d1) 190 x 140 x 60 mm

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Part No. 105365 AH D50 1000 D150.190 STTZN

GTIN 4013364106055, Customs tariff No. (EU): 85389099, Gross weight: 14.63 kg, PU: 1.00 pc(s)

Images

Additional information

Spacer for omnidirectional antennas, clamping range: 150-190 mm, St/tZn
Spacer for omnidirectional antennas for fixing the supporting tube construction at the antenna mast
For DEHNiso Combi supporting tubes with HVI power Conductor installed inside and/or outside the supporting tube
At least two spacers have to be mounted per supporting tube of the isolated air-termination system
Spacers are dimensioned according to Eurocode 1 (DIN EN 1991-1-4 + DIN EN 1991-1-4/NA)
Material of support / square profile: St/tZn
Clamping range (Ø mast): 150-190 mm
Clamping range of supporting tube: 50 mm
Length of spacer: 1000 mm
Dimensions: 230 x 180 x 70 mm

Brand: DEHN
Type: AH D50 1000 D150.190 STTZN
Part No.: 105365
or equivalent.

 

Technical data

Material of support / square profile St/tZn
Clamping range (Ø mast) 150-190 mm
Clamping range of supporting tube 50 mm
Length of spacer 1000 mm
Dimensions (w1 x h1 x d1) 230 x 180 x 70 mm

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