New Wide-band Antenna Product Line Reduces Tower Opex with Reduction in Wind-load, Weight, Size

As carriers upgrade and improve coverage, new antennas and radio equipment placed on the tower can increase those costs under the present leasing agreements. Additional capital expenditures (CAPEX) may also be incurred due to the additional weight and wind load of this equipment causing a need to improve the structural capabilities of the tower.

As carriers upgrade and improve coverage, new antennas and radio equipment placed on the tower can increase those costs under the present leasing agreements. Additional capital expenditures (CAPEX) may also be incurred due to the additional weight and wind load of this equipment causing a need to improve the structural capabilities of the tower.

To avoid these additional costs, Kathrein has introduced a new antenna product line, designated 840370xxx, that is slimmer, lighter and less wind load than previous designs while still maintaining its electrical performance and high port count.

By taking advantage of this high port count, Kathrein’s new wideband 4×4 MIMO (Multiple in-Multiple Out) dual band solution allows operators to:

• reduce the physical number of antennas on a sector, thereby lowering tower leasing costs while adding significant additional capacity and throughput.

The first antenna model in the new family is the 840370799 (Figure 1), a 378 mm (14.9”) wide by 2.4m (8’) tall dual broadband antenna with 12 ports. Rather than stating the specifications found on the datasheet, it is more interesting to compare this antenna to its Kathrein legacy functionally equivalent model, the 80010992.

The advanced technology utilized in this new antenna:

• reduces the width by 25% and the weight by 30%
• the maximum wind load is reduced by 33%1
• the reduction is greater than the height and the width difference due to another new technology, the vortex generator
• these features make this antenna presently the world’s narrowest antenna with true broadband side-by-side dual polarized low band (698-894 MHz) array

Figure 3 compares the wind load results from wind tunnel testing of the 80010992 to that of the 840370799. The wind load reduces the maximum wind load by about 28% from 1555 N to 1115 N based on the size reduction from both the width and height of the of the 840370799 without impacting electrical performance. Additionally, the frontal wind load is almost half that of the 840370799 without the vortex generators.

The Opex savings with the reduction in size, weight and wind load of the 84037xxx platform is clear. Operators will benefit greatly from utilizing the new Kathrein antennas – their networks will perform with the precision they know and expect from Kathrein – just in a smaller package, saving thousands if not millions of dollars in tower modifications and leasing costs.