GATE ECE 2002 | Antennas Question 24 | Electromagnetics

GATE ECE 2002

MCQ (Single Correct Answer)

-0.3

The line-of-sight communication requires the transmit and receive antennas to face each other. If the transmit antenna is vertically polarized for best reception the receiver antenna should be

horizontally polarized

vertically polarized

at $${45^ \circ }$$ with respect to horizontal polarization

at $${45^ \circ }$$ with respect to vertical polarization

GATE ECE 2000

MCQ (Single Correct Answer)

-0.3

If the diameter of a $$\lambda /2$$ dipole antenna is increased from $$\lambda /100$$ to $$\lambda /50$$ then is

bandwidth increases

bandwidth decreases

gain increases

gain decreases

GATE ECE 1998

MCQ (Single Correct Answer)

-0.3

The vector $$\mathop H\limits^ \to $$ in the far field of an antenna satisfiels

$$\nabla .\,\mathop H\limits^ \to = 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to = 0\,$$

$$\nabla .\,\mathop H\limits^ \to \ne 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to \ne 0$$

$$\nabla .\,\mathop H\limits^ \to = 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to \ne 0\,\,$$

$$\nabla .\,\mathop H\limits^ \to \ne 0\,\,and\,\,\nabla \times \,\mathop H\limits^ \to = 0\,\,$$

GATE ECE 1998

MCQ (Single Correct Answer)

-0.3

The far field of an antenna varies with distance r as

1/r

1 / $${r^2}$$

1 / $${r^3}$$

$${1 \over {\sqrt r }}$$

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