Isotron is the trade name for a shortwave antenna marketed by Bilal Co. for use as an amateur radio transmitting antenna for restricted spaces. [1] It is physically short as compared to a dipole antenna for a given frequency. The bandwidth of the Isotron is quite narrow as compared with a dipole antenna. This is most pronounced on the lower frequency bands.
A Isotron antenna is electrically resonant by using only two components: a large coil in series with the capacitive plates. Its design is electrically the same of a 1/2 wave dipole. [2]
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