A Slotted Waveguide Antenna is a waveguide with slots cut into it. Electromagnetic waves radiate out of and into these slots during transmission and reception, respectively.

Depending on slot sizing and spacing, the RADAR beam can be steered by varying the frequency of the RADAR signal while the antenna remains fixed, rather than by turning the antenna.

Since beam steering is done via changing the frequency of the RADAR signal, the Slotted Wave Antenna relies on frequency scanning for operation, thus Answer A. is the right one.

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A typical shipboard RADAR antenna is a slotted waveguide array.

A slotted waveguide array is a type of antenna commonly used on shipboard RADAR systems. It consists of multiple waveguide elements arranged in an array and equipped with slots or openings along their length.

The design of a slotted waveguide array allows for efficient radiation and reception of electromagnetic waves. When high-frequency RF signals are fed into the waveguides, the slots act as radiating elements, emitting the electromagnetic waves in a controlled pattern.

The slots in the waveguide array are precisely dimensioned to achieve the desired radiation pattern and beam shape, allowing for beam steering and target tracking capabilities. By controlling the amplitude and phase of the signals fed into each waveguide element, the antenna can electronically steer the beam in both azimuth and elevation, without physically moving the entire antenna structure.

The slotted waveguide array provides the advantages of electronic beam scanning, which allows for fast target acquisition, tracking, and versatility in various operational scenarios encountered on ships.

Mnemonic: "Slotted Efficiency"

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Good bearing resolution largely depends upon:

A narrow antenna beam in the horizontal plane.

Bearing resolution in a radar system refers to the ability to accurately determine the direction or angle from which a target is emitting signals or reflecting them back to the radar. A narrow antenna beam in the horizontal plane plays a significant role in achieving good bearing resolution.

When the antenna beam is narrow in the horizontal plane, it provides a finer angular resolution. This means that the radar system can distinguish between two closely spaced targets and accurately determine their azimuth angles or bearings. A narrow beamwidth allows the radar to focus its energy more precisely in the horizontal direction, leading to better discrimination between targets in that plane.

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Longer antennae are more expensive and you always need more money to get better performance.

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