Variable Radiating Cables Operating at Frequencies up to 2200 MHz Measurements of the Prototypes in a Tunnel

摘要

Slotted cables of the "Vario" type, thanks to their property of distributing emitted power evenly along their lengths by compensating longitudinal losses, are optimized radiating structures for tunnels and offer significant advantages over conventional cables with increasing frequency. This articles gives some highlights on the design of a tunnel plant employing variable cables and provides test results of two new "Vario" prototypes working at frequencies up to 2200 MHz.