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A shortwave broadband antenna is a radio antenna that can be used for transmission (and reception) of any shortwave radio band from among the greater part of the shortwave radio spectrum, without requiring any band-by-band adjustment of the antenna. Generally speaking, there is no difficulty in building an adequate receiving antenna; the challenge is designing an antenna which can be used for transmission without an adjustable impedance matching network.

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  • Breitbandantenne (de)
  • Shortwave broadband antenna (en)
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  • Breitbandantennen sind Antennen, bei denen sich durch besondere konstruktive Maßnahmen die elektrischen Eigenschaften (zum Beispiel die Strahlungscharakteristik und der Fußpunktwiderstand) über einen weiten Frequenzbereich wenig ändert. (de)
  • A shortwave broadband antenna is a radio antenna that can be used for transmission (and reception) of any shortwave radio band from among the greater part of the shortwave radio spectrum, without requiring any band-by-band adjustment of the antenna. Generally speaking, there is no difficulty in building an adequate receiving antenna; the challenge is designing an antenna which can be used for transmission without an adjustable impedance matching network. (en)
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  • Breitbandantennen sind Antennen, bei denen sich durch besondere konstruktive Maßnahmen die elektrischen Eigenschaften (zum Beispiel die Strahlungscharakteristik und der Fußpunktwiderstand) über einen weiten Frequenzbereich wenig ändert. Bleiben die Abmessungen einer Antenne normiert auf die Wellenlänge gleich, dann bleiben auch deren elektrischen Eigenschaften konstant. Eine Antenne, deren Form bei einer Maßstabsänderung unverändert bleibt, ist also frequenzunabhängig. Diese Forderung ist dann erfüllt, wenn die Antennenstruktur nur durch die Angabe von Winkeln definiert werden kann (Winkelprinzip). Damit muss die Struktur jedoch unendlich ausgedehnt sein und auch die Speisepunkte müssen unendlich dicht beieinanderliegen. In der Praxis begrenzen die jeweiligen Minimal- und Maximalabmessungen den Nutzfrequenzbereich der Antenne. (de)
  • A shortwave broadband antenna is a radio antenna that can be used for transmission (and reception) of any shortwave radio band from among the greater part of the shortwave radio spectrum, without requiring any band-by-band adjustment of the antenna. Generally speaking, there is no difficulty in building an adequate receiving antenna; the challenge is designing an antenna which can be used for transmission without an adjustable impedance matching network. An ideal “broadband” shortwave antenna would work continuously across much of, if not all of, the shortwave spectrum with good radiation efficiency and minimal compromise of the radiation pattern. Most practical broadband antennas compromise on one of the above: Either they only work on a few relatively narrow slices of the HF radio spectrum, or they work across the complete spectrum, without gaps, but are inefficient radiators on some or all of the frequencies. Other antennas provide adequate efficiency on some frequencies, but require a separate antenna tuner to function on others. A few designs remain omnidirectional on all frequencies but most “beam” antennas lose their directionality. (en)
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