7 elements full size arranged on a single boom, divided into 2 parts for 20 m, 2 elements for 15m and 3 elements for 10m in spotlight radiator configuration and reflector-radiator-director.
The system is optimized in order to make the maximum gain ratio of forward and front / back, for each individual user bandwidth.
The antenna has been shaped with the most sophisticated computing software NEC, based on the integral method of moments MoM (Method Of Moments), and optimized with heuristic algorithms (PSO).
Starting from the numerical model, the antenna has followed the prototype phase through iterative cycles of measurement and optimization, until reaching the convergence between the design features and performance, verified ” in situ .”
The main structure of the Delta Loop “The Claw” is made in aluminum parts and steel, dimensioned to work entirely in the elastic range. In this way the structure appears to be elastic and simultaneously very robust .
Unlike structures made in another material (eg. Glass fiber), aluminum systems confer a considerable duration and better response to wind loads.This allows to keep stable the antenna geometry (shape) and avoid sudden changes in impedance, efficiency and decay properties of the remaining features of the system.
Three impedance adapters to match the range high dielectric strength (600 kV) independently feeding the radiating elements of each band.
The upper cable, produced by Smartech Projects, has excellent resistance to tearing and abrasion. It ‘also highly refractory to the actions of UV rays and to chemical attack. In it, the greater the current flowing in RF of the whole system and is therefore composed of pure copper of 99.99% (with staganatura antioxidant) and isolated with special polymer that has excellent dielectric characteristics (better insulation of the glass.)
Polar patterns of far-field radiation (far field) typical.
The diagrams show the solid irradiation for installation at 20 m above the ground and for greater distances the Fraunhofer away.
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BOLPA-10 A Super Wide Band, High Performance Log Periodic Dipole Array (LPDA) – 14MHz to 30MHz Optimised for all Ham Bands Just 7.7m long
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