Patent ID: 6437577
Filing Date: 2002-08-20
Classification: H01Q

Abstract:
A circuit for testing the working of at least one antenna for a radio telephone having a control circuit, said circuit comprising:a test current that is sent in an RF path via an antenna to the antenna by a voltage source independent of an RF signal current flowing on said RF path via said antenna wire, and a measuring device, connected between said antenna wire and a common return, to monitor the continuity of the test current, wherein each antenna has a radiator with one end that open rises up into the space, wherein a secondary path parallel to the RF path containing an impedance is connected to each radiator and to the common return to return separate test currents, wherein the monitoring of the test current is performed by a voltage evaluator, and wherein there are resistors connected in series in the secondary path with feed cables whose lengths are shorter than one-tenth of the transmission wavelength so that the feed cables do not significantly affect the high-frequency characteristics of the radiator.