Обычное объяснение 50 Ω и 75 Ω коаксиальных кабелей: три оптимума с использованием электростатического FEM и формул

Оригинал

The usual explanation for 50 Ω and 75 Ω coax: three optima, using electrostatic FEM and formulas

50 Ω and 75 Ω are common coaxial-cable impedances. The usual explanation is that there is no single best impedance. For an air-filled coax with a fixed outer diameter, three different goals have three different optima: most power before the dielectric breaks down: 30 Ω most voltage before the dielectric breaks down: 60 Ω lowest conductor loss: 77 Ω 50 Ω is commonly described as a compromise between the first and the last, and 75 Ω as sitting close to the low-loss optimum. For the voltage an