Notch antenna for a wide frequency band

摘要

Notch antennae consist either of a cut in a metallic structure or of an electrically conductive frame on a metallic body, and of a tuning capability to a specific frequency. This is implemented according to the invention in that the connecting cable is connected at the one end to the notch antenna, i.e. in the region of the open end in the case of a cut, and at its one end in the case of a frame. Connected in parallel with the connecting cable is a capacitor whose value is changed as a function of the frequency band in order to compensate for the reactive components of the antenna internal impedance. In the region of the opposite end, i.e. in the inner part in the case of a cut and at the opposite end in the case of a frame, a terminating reactance is inserted whose value is likewise changed as a function of frequency such that the resistive components of the antenna internal impedance has the desired magnitude. The latter may consist of the parallel connection of variable capacitances and a connected inductor. The capacitances are formed by capacitors which can be connected in parallel and can be switched, for example, by PIN diodes. <IMAGE>