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In this paper, we present a new wideband miniature branchline coupler as a key element to be integrated for 60 GHz beamforming networks in phased arrays. Theory and equations as well as a first proof-of-concept at 2.2 GHz are presented. A 25% matching bandwidth (−10 dB), ± 1 dB amplitude imbalance and ± 2° phase imbalance are measured with a reduced footprint. Then, the same coupler topology is optimized...
A 360deg phase shifter using a tunable quasi-lumped hybrid coupler was successfully designed. The phase shifter circuit delivers two evenly-split signals phase shifted over a 368deg controllable range. The phase shifter was connected to an antenna array made with two printed patches. The feasibility of pattern reconfiguration was validated by the Sij- and radiation pattern measurements.
In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100times40 mm2 metallic ground plane acting as the printed circuit board (PCB) of the mobile phone. Two UMTS PIFAs are located at the top edge of this PCB. They are fed by a double quasi-lumped coupler able to provide a 360deg...
In this communication we present a novel polarization-agile microstrip antenna design. To dynamically change the polarization state, the radiating patch is fed by a tunable quasi-lumped coupler. The whole structure can be dynamically altered to radiate electromagnetic waves with vertical linear, horizontal linear, right-handed circular or left-handed circular polarization simply by changing the operating...
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