Wideband Slot-Coupled Butler Matrix

Beamforming Networks for antenna array, useful inWiFi applications

“…Talking about these systems is talking about the smart antennas and indirectly of multibeam systems the require wide-angle coverage with very directive beams. Multibeam and beam-scanning antennas are implemented using multiple antennas to create several beam patterns in different directions, either as beam switch or continuous beam terminated in a sophisticated signal processor, which can adjust or adapt its own beam pattern in order to emphasize signals of interest and to minimize interfering signals (Abdelghani et al, 2012a,b;Bialkowski et al, 2008;Moscoso-Mártir et al, 2014). Beamforming networks are a great solution to generate several beams with great directivity and good bandwidth, they have been classified into several ways, it was reported in the applications cited previously, so to facilitate our learning it has been divided into 3 groups according to their applications: based on transmission lines (Network BFNS), based on quasi-optical lenses (Quasioptical BFNS) and based on digital data processing networks (digital BFN), (Lo and Lee, 1988;Hansen, 2009;Hall and Vetterlein, 1990;Josefsson and Persson, 2015).…”

Design of Multi-feed UWB Antennas using the Theory of Characteristic Modes

“…In recent years these elements have been experimented by virtue of improving their characteristics [92,93]. The UWB Butler matrices [94][95][96][97][98] have started to be developed, the systems in which this type of design is applied are: satellite communications [99], radar applications, unmanned aerial vehicles, etc.…”