Abstract: A monopole type antenna suitable for operating in cellular frequency bands, the antenna comprising: a conductive surface forming a radiating element and including an electrical connection zone; a compact conductive counterpoise including a connection zone; and a feed line comprising an antenna cable connected to the connection zones of said radiating element and of said compact counterpoise. In the antenna, said radiating element is in the form of an open loop having two branches both connected to the antenna cable and defining first and second radiating portions, each of the radiating portions is suitable for entering into resonance at at least one cellular frequency and extends in a main direction; and these two main directions are substantially parallel so as to operate parasitically and with coupling between the two radiating portions.

Abstract: The invention relates to an antenna of colinear type. It comprises a radiating portion comprising: three substantially rectilinear conductive wire elements that are mutually parallel, comprising a central conductor and two lateral conductors; and 2N radiating zones constituted by alternating first radiating zones and second radiating zones: each first radiating zone further comprising a cylindrical conductive element whose axis coincides with said central wire element and which is electrically connected to both of said lateral wire elements; and each second radiating zone further comprises two cylindrical conductive elements whose axes coincide substantially respectively with the lateral wire elements, said cylindrical elements being electrically connected to said central wire element.

Abstract: The invention provides an elongate antenna having a radiating portion constituted by an elongate conductor element. The elongate element is machined to include: N dipoles (where N is an integer not less than 2) made up of N rectilinear sections of said element in alignment; and N?1 phase-shifter elements, each phase-shifter element being interposed between two consecutive dipoles, each phase-shifter element having a section of the elongate conductor element folded into a U-shape and having branches which are substantially juxtaposed and which extend in a direction that is orthogonal to the common direction of the dipoles.

Abstract: The invention relates to a patch type antenna comprising:

Abstract: The invention provides a mobile radiotelephone comprising a casing, a printed circuit card placed inside the casing (30), and an antenna constituted by a radiating conductive element (44) and by a ground plane (50). The radiotelephone is characterized in that the radiating conductive element (44) is disposed outside the casing (30), is mechanically connected thereto, and extends substantially parallel to the printed circuit card. The printed circuit card (42) carries means forming a ground plane (50). The distance h between the radiating conductive element (44) and the printed circuit card (42) lies in the range 7 mm to 15 mm. The radiating conductive element is embedded in an insulating piece (44) mechanically connected to the housing and presenting sufficient mechanical strength to constitute a fastener system for the radiotelephone.

Abstract: The invention relates to an antenna of colinear type.

Abstract: The invention provides an elongate antenna.

Abstract: The invention relates to an internal antenna element of the patch type for a portable device. The element comprises a body of dielectric material, a conductive plate covering the top face of the dielectric, and a conductive strip covering one of the side faces of the dielectric, the strip being electrically connected along its top edge to one of the edges of said plate and being provided with electrical connection means for connecting said conductive strip to a ground plane that is to be placed against the bottom face of the dielectric body, the other three side faces having no metallization, means passing through the dielectric body for electrically connecting the hot point of an antenna conductor to said plate, and capacitor-forming means for providing capacitance between the plate and the ground plane when the antenna element is mounted on the ground plane, and located close to the side face of the dielectric body that is remote from its side face covered by said conductive strip.

Abstract: The invention relates to a microstrip antenna for transmitting and receiving waves of wave length &lgr;. It comprises a first insulating plate and a first metallization effected on a face of said plate in order to form a ground plane; a second insulating plate and at least one second metallization effected on a face of said second plate and presenting dimensions smaller than those of the first metallization; at least one feedline connected to said first and second metallization; and spacer means fastened with the two plates in order to maintain the two plates in a predetermined relative position so that the two metallizations face each other and the second metallization is opposite the first.