The Boolean function f implemented in the figure using two input multiplexers is

The Boolean expression for the truth table shown is

A	B	C	D
0	0	0	0
0	0	1	0
0	1	0	0
0	1	1	1
1	0	0	0
1	0	1	0
1	1	0	1
1	1	1	0

Many circles are drawn in a Smith chart used for transmission line calculations. The circles shown in Fig. represent

Two identical and parallel dipole antennas are kept apart by a distance $$\lambda /4$$ of in the H-plane. They are fed with equal currents but the right most antenna has a phase shift of +90°. The radiation pattern is given as