Alcatel

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Jean-Philippe Coupez

Christophe Grangeat

Charles Ngounou

Francedillaois Lepennec

Charles Ngounou Kouam

Laurence Lorcy

Francois Lepennec

A multifrequency microstrip antenna in accordance with the present invention includes two zones connected to a short-circuit consisting of two conductive strips. These zones are sufficiently decoupled from each other to enable two resonances to be established in two respective different areas formed by the zones. The resonances are at least approximately of the quarter-wave type and each has an electric field node fixed by the short-circuit. The same coupling device is used to excite the two resonances. The invention applies in particular to portable telephones and to their base stations.

Multifrequency microstrip antenna and a device including said antenna

A microstrip antenna includes a composite short-circuit consisting of two conductive strips. A vertical strip, in the plane of the short-circuit between the two strips, is connected to the central conductor of a coupling line forming part of the antenna and enabling the coupling with a resonance thereof, as for example to excite such resonance. The short-circuit and the vertical strip constitute two terminals for said antenna, enabling it to be easily connected to a signal processing units, such as a transmitter. The antenna described includes two zones enabling it to operate at two frequencies. The antenna has particular utility in portable telephones and their base stations.

Short-circuit microstrip antenna and device including that antenna

A quarter-wave antenna includes a patch and a ground respectively formed on the two surfaces of a substrate and mutually connected by a short-circuit. A coupling strip enters the patch via said short-circuit. It extends in the patch between two lateral slots and is connected thereto at an internal point to enable resonance of the antenna to be excited. According to the invention, the lateral slots are sufficiently narrow for a lateral coupling effect to contribute to excitation of the antenna from the edges of the strip. The invention applies in particular to mobile telephones.

Microstrip antenna and a device including said antenna

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Plouzanne, France

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