F023 TAv 23 - Radar EO23.02 waveguides and scanners

State one of the main parameters used to measure the effectiveness of directional radar aerial propagating a beam of energy.

Polarisation is relative to the earth and is determined from the plane in the beam that contains;

• the electrical field

• the magnetic field

• the largest frequency

• the largest amplitude

A beam shape that is broad in elevation and narrow in azimth describes what type of beam?

• Fan Beam

• Pencil Beam

• cosec² Beam

• Broad Beam

what type of parabolic reflector is best suited for target tracking?

• Paraboloid

• Parabolic Cylinder

• Truncated Paraboloid

• Orange-Peel Paraboloid

True or False:

A phased array aerial is the simplest and cheapest method especially for 180^o sector scanning

• False

• True

True or False:

A Planner array aerial has great agility in changing beam shape.

• False

• True

An aerial array that uses a larger number of active miniature transmitter-receiver elements is called:

• An Active Array

• a Phased Array

• a Linear Array

• a Planner Array

Within a three port circulator what device directs the microwaves?

• Ferrite disc and permanent magnet

• Dummy Load

• T/R cell

• Coupling slot

• Choke Flange