RFjohtimen

RFjohtimen refers to a conductor designed to carry radio-frequency signals. In Nordic languages, the term translates to RF conductor and covers transmission lines and cables used in RF systems. A typical RFjohtimen consists of a central conductor, a dielectric layer, shielding, and an outer jacket. Common forms include coaxial cables, shielded twisted-pair cables, and RF microstrip traces on printed circuit boards. Each form has a characteristic impedance (for example, 50 ohms or 75 ohms) that should be matched to the source and load to minimize reflections.

Key performance parameters include attenuation (loss per unit length), return loss or VSWR, power handling, and shielding effectiveness. Materials are chosen for low loss and durability: copper or silver-plated conductors, dielectrics such as PTFE or polyethylene, and shielding with foil or braided copper. Connectors (SMA, BNC, N-type) and mating interfaces influence overall system performance and must be selected for frequency range and environmental conditions.

RFjohtimen is used in a wide range of applications, from linking RF transceivers to antennas and test equipment, to feeding signals in broadcast, satellite, and cellular systems. Design considerations include choosing the correct impedance, minimizing bends that exceed minimum bend radius, ensuring proper connectors, and accounting for temperature, moisture, and mechanical stress.

In practice, RFjohtimen is a foundational element in RF engineering, enabling efficient transfer of high-frequency signals with controlled impedance and low loss.