Browsing by Author "Copner, Nigel"
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- Electronically Reconfigurable FSS-Inspired Transmitarray for 2-D BeamsteeringPublication . Reis, João R.; Caldeirinha, Rafael F. S.; Hammoudeh, Akram; Copner, NigelA novel electronically reconfigurable transmitarray (TA) with 2-D beamsteering capability is presented in this communication. The proposed structure, inspired on frequency selective surfaces loaded with varactor diodes, allows the phase range of each TA element to be individually controlled enabling an automated steering of the main lobe of an original antenna pattern, in both elevation and azimuth planes (2-D beamsteering). This has been demonstrated on a 5 × 5 unit-cell stacked structure with active feeding, coupled to the aperture of a standard gain horn antenna. A complete electromagnetic study using CST Microwave Studio is presented to evaluate and characterize the TA elements and the effect the proposed feeding network has on the structure's behavior. Following initial simulations, a prototype of the active TA has been characterized. Automated antenna beamsteering with ranges up to Az = 28° and El = 26° and 1° of angular resolution, is achieved by means of electromagnetic simulations and validated against experimental results at 5.2 GHz.
- Measurements and Modelling of Spatial Diversity using 2D TransmitarrayPublication . Reis, Joao R.; Hammoudeh, Akram; Copner, Nigel; Caldeirinha, RafaelThis paper disseminates the results of the first experimental trials on Spatial Diversity (SD) with beamsteering capabilities by the means of 2D transmitarray and thus reduced RF chains. The SD arrangement is composed of a dual antenna configuration in which beamsteering is activated by using electronically reconfigurable transmitarray (eRT) in front of the two single directive antennas. The experimental radiation patterns obtained at 5.2 GHz proves the usefulness of the concept.