ABSTRACT
At the antenna ends the wires usually converge to a common point, forming a cone. Such radiators are named multi-wire or volumetric, and also cage antennas. Multi-wire antennas are used, as a rule, in one frequency band, although this band can be quite wide. The multi-radiator antenna can operate as a multi-frequency antenna. Combining the two principles of antenna construction: the inclusion of a complex load and the use of a multi-radiator structure makes it possible to create an antenna of acceptable dimensions with good characteristics. The antenna impedance can be found by considering a linear radiator, the current along which is equal to the total current along the multi-radiator antenna. The multi-radiator antenna without a load has high characteristics in the vicinity of series resonances of individual radiators, but in order to obtain such characteristics in a continuous range, its diameter must be significantly increased to reduce the spatial coupling between these radiators.
