Alcatel

Alcatel Lucent

Pascal Herve

Charles Ngounou Kouam

Jean-Philippe Coupez

Christophe Grangeat

Laurence Lorcy

The antenna ( ) of this system is a microstrip antenna. A rear edge ( ) of the body ( ) of its patch ( ) is provided with a short-circuit (S) by which a quarter-wave type primary resonance can be excited from a connecting line (C ). A slot ( ) penetrates the patch from its periphery and separates a body from a tail ( ) which remains connected to the body by a passage ( ). A secondary resonance mode utilises the body, the passage and the tail. It can be excited from the same connection line at a frequency which is twice that of the primary resonance. The short-circuit can be obtained by components attached to the edge of the substrate of the antenna and can then have inductive, resistive and controlled components. The invention applies in particular to implementing a two-mode mobile radio system using the GSM and DCS standards.

Dual-band transmission device and antenna therefor

An antenna with stacked resonant structures includes: a guide line for guiding electromagnetic waves formed in a conductive layer lying in a plane, and two resonant structures having different resonant frequencies, the two structures being formed on respective opposite sides of the plane so that both are coupled directly to the line and substantially decoupled from one another by the conductive layer. The guide line is preferably of the coplanar type and the two resonant structure are preferably of the quarter-wave type. The invention applies in particular to dual-band mobile telephones.

Antenna with stacked resonant structures and a multi-frequency radiocommunications system including it

An antenna has a patch with a rear edge provided with a short circuit enabling a quarter-wave resonance to be established. A half-wave resonance can also be established between two lateral edges of the patch. The same coupling device couples the antenna to a transmitter or receiver for each of the two resonant frequencies. It includes a coupling strip penetrating the patch between the edges of a slot extending from one lateral edge. The antenna is particularly applicable in dual mode mobile telephone system using GSM and DCS standards.

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Paris, France

Pascal Herve