| Electrical Shortening |
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One understands by electric shortening the modification of an aerial which is longer than the a whole-number multiple of the quarter of the radiated wavelength, by suitable electronic device without changing the length of the aerial in such a way that it corresponds electrically to the previous whole-number multiples of the quarter of the used wavelength. Basically a shortening is only possible to the last whole-number multiples of the quarter of the radiated wavelength. Thus an aerial with a length corresponding to five-eighths of the radiated wavelength can be shortened, only to a half wave radiator, but not to a quarter wave radiator. TECHNICAL REALIZATION By switching a capacitator in serial with the antenna. APPLICATION Making an antenna usable for multiple frequencies DISADVANTAGES Lower effiency, possible reduction of bandwidth SEE ALSO |
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