On the implementation of miniaturized and optimized transceivers for UMTS base stations

International audienceAn original implementation of a TX/RX transceiver for future UMTS base stations is proposed in this paper. Machined Foam substrates are stacked at first for implementing a square patch antenna on a composite thick support, then delivering interesting performances in terms of bandwidth and efficiency with respect to planar solutions. Active and passive devices are inserted within a shielded cavity created under the patch, then preventing from size constraints at such frequencies as well as insertion loss and parasitic radiations. A complete experimental procedure is presented for both TX and RX operating modes.An original implementation of a TX/RX transceiver for future UMTS base stations is proposed in this paper. Machined Foam substrates are stacked at first for implementing a square patch antenna on a composite thick support, then delivering interesting performances in terms of bandwidth and efficiency with respect to planar solutions. Active and passive devices are inserted within a shielded cavity created under the patch, then preventing from size constraints at such frequencies as well as insertion loss and parasitic radiations. A complete experimental procedure is presented for both TX and RX operating modes

Accessing to UMTS filtering specifications using new microstrip miniaturized loop-filters

International audienceA new topology for the design of microstrip loop-filters is proposed in this paper. This new geometry is used in a coupled-loop-resonator filter in order to improve the out of band rejection (by introducing an additional transmission zero), as well as insertion loss (thanks to a significant circuit size reduction). The design methodology of these filters is first described and then experimental performances are discussed. Finally, a high performance duplexer, specified for UMTS frequencies and requirements (i.e. in the 1.9-2.17 GHz frequency band), is presented. Measured insertion loss is lower than 2.5 dB and an isolation level greater than 40 dB is achieved between Tx/Rx channels, thanks to the multiple out of band transmission zeros introduced in the filter synthesis

Antennes conformées 3D à large champ d'ouverture en rayonnement

International audienceA new topology for the design of wide-beamwidth planar antennas is proposed in this paper. This new geometry uses conformal patches inserted in a machine ground plane. The two equivalent slotline apertures of this low Q-factor resonator are located on the ground plane level, with a horizontal orientation of radiating E-fields. This contributes to minimize the parasitic coupling effects when implementing a complete antenna array with such new basic element. In the same time, a significant size reduction of the patch is performed through the elongation path due to the geometry shape. The design methodology is presented as well as a comparison between a regular patch antenna and the proposed design. Technological orientations are discussed and validated through experiments.A new topology for the design of wide-beamwidth planar antennas is proposed in this paper. This new geometry uses conformal patches inserted in a machine ground plane. The two equivalent slotline apertures of this low Q-factor resonator are located on the ground plane level, with a horizontal orientation of radiating E-fields. This contributes to minimize the parasitic coupling effects when implementing a complete antenna array with such new basic element. In the same time, a significant size reduction of the patch is performed through the elongation path due to the geometry shape. The design methodology is presented as well as a comparison between a regular patch antenna and the proposed design. Technological orientations are discussed and validated through experiments

Implementation of compact RX modules for smart base station arrays

International audience

A flexible test-bed for developing UMTS multi-antenna applications

International audienceA flexible test-bed for developing UMTS multi-antenna application

Filtres microrubans compacts à très forte sélectivité pour les terminaux mobiles de 3ème génération

International audience

A flexible test-bed for developing UMTS multi-antenna applications

International audienceA flexible test-bed for developing UMTS multi-antenna application

Plate forme expérimentale

International audiencePlate forme expérimental

Etude comparative de différentes solutions bas-coût pour l'intégration de réseaux d'antennes en bande Ku

International audience