hochfrequente

Hochfrequente is a term used in German to describe high-frequency electrical signals and electromagnetic radiation, particularly those in the radio-frequency (RF) domain. In technical usage it denotes frequencies above audio ranges, typically from a few kilohertz up to several gigahertz, with emphasis on the portions of the spectrum used for wireless communication, broadcasting, and related technologies.

Applications of hochfrequente signals span a wide range of fields. They are central to radio broadcasting, mobile and wireless communications, television, radar, satellite links, and data transmission networks. In industry and science, hochfrequente methods enable microwave heating, medical diathermy, spectroscopy, and various sensing and measurement techniques. The term is common in electronics, telecommunications, physics, and electrical engineering to distinguish RF work from lower-frequency electronics and audio engineering.

Technically, hochfrequente systems rely on components such as oscillators, amplifiers, mixers, modulators, filters, antennas, and transmission lines. Design considerations include impedance matching, shielding, and signal integrity over long or lossy paths. Modulation techniques range from traditional analog methods (AM, FM, PM) to modern digital schemes (QAM, OFDM) used in complex communication standards. Safety and regulation are important: exposure limits for high-frequency fields are set by health authorities, with guidelines addressing tissue heating and occupational exposure, and various national and international standards governing emissions and device approvals.

See also: electromagnetic spectrum, radio frequency, wireless communication, RF engineering.