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This paper presents the design of antenna arrays of patches fed by microstrip hybrid branchline couplers in reflection mode as phase shifters. This topology permits the reduction of the number of FET, PIN diode or MEMS switches by two when compared with classic array feeding techniques. Two antenna prototypes are simulated, fabricated and measured. The results show beam steering capability over a...
The National Center for Scientific Research (CNRS) in France launched a number of specific actions (SA) in order to identify the most challenging issues to be investigated by the French research community. One of these specific actions is dedicated to antenna miniaturisation. The aim of this action is to provide a state of the art and new direction of studies in the following topics: antenna miniaturisation...
This paper presents a solution to reduce the mutual coupling between two planar inverted-F antennas (PIFA's) working in close radiocommunication standards: DCS1800 (1710-1880 MHz) and UMTS (1920-2170 MHz). These antennas are positioned on the corner of a limited ground plane whose size is representative of the printed circuit board (PCB) of a typical mobile phone. Three antennas are designed and several...
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