Multiple Antenna Techniques

Under which conditions of charge does the radiation occur through wire antenna?

• For a charge with no motion

• Metallic device for radiating or receiving waves

• Transducer between guided wave and radiate wave

• Sensor of electromagnetic wave

If the observation point is closely located to the source then the field is termed as

• Induced

• Radiated

• Reflected

• Far field

Which is the nature of radiation pattern of an isotropic antenna

• Spherical

• Dough nut

• Elliptical

• Hyperbolic

Which type of wire antenna is also known as dipoles

• Linear

• Loop

• Helical

• All the above

What is the nature of current distribution over the small dipoles?

• Spherical

• Rectangular

• Triangular

• Square

The capacity of the MIMO system is maximized when the channel matrix is

• Unitary matrix

• Orthogonal matrix

• Symmetric matrix

• Non symmetric

MIMO stands for

• Many input Many output

• Multiple input Multiple output

• Minor input Major outpput

In MIMO, which factor has the greatest influence on data rates?

• The size of antenna

• The height of the antenna

• The number of transmit antennas

• The area of receive antennas

MIMO was initially developed in the year

• 1980

• 1990

• 1975

MIMO is a smart antenna technology.

• True

• False