Smarteq Wireless Ab

Zsolt Barna

Peter Lindberg

Matching circuit for radio antenna that functions on a two-frequency band which are spaced approximately at a distance of one octave, wherein the upper band is broad. For instance, the first frequency band may be 890-940 MHz and the other band 1710-2200 MHz. The radiator may be a dipole or a monopole over the earth plane, whose bandwidth is sufficient for the first band. The larger bandwidth for the second band is obtained with a transmission circuit that moves and forms the frequency curve stepwise in the Smith chart. When necessary, the matching circuit includes a broadband Balun transformer in addition to said matching circuit.

Radio antenna matching circuit

Antenna coupling device

An adapter antenna ( ) is used for contactless connection of a mobile telephone ( ) to an external antenna ( ) in case the telephone lacks a connector for coaxial cable ( ) for such a purpose. The most common application is when a mobile telephone is to be used in a vehicle. Transfer of radio waves occurs in the near field of the built-in antenna ( ) of the telephone by capacitive coupling. One preferred embodiment especially suited for plane inverted antennae of type L, E or F is described. An optimizing method for two frequency bands is described.

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Budapest, Hungary

Zsolt Barna