A frequency and pattern reconfigurable Yagi antenna consisting of a PIN diode at the arms of the driver element with three switchable frequencies at 1.
5 shows the simulated reflection coefficient for various folded part positions of longest driver element.
The proposed antenna consists of three quasi-Yagi elements of different lengths and three parasitic elements above the driver elements.
Most systems show the semi ellipse in Figure 1 as a continuous curve, obtained joining contiguous positions of the locus point when sampling the path of the driver element
Indeed, the phones actually transmit sound from the driver element
right through the outer cover, which allows them to serenade nearby listeners quite effectively.