# Antennas Internship

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Sanfoundry offers internships in "Antennas". Read the complete details below regarding the internship requirements, eligibility criterior and the application process.

## Pre-requisite / Skillset for Antennas Internship

1. Intern must know the basic terminology and concepts of Antennas.

2. Intern must be aware of parameter considerations viz. antenna efficiency, beam efficiency, radiation resistance etc. in the design of an antenna.

3. Must be able to examine the electric and magnetic field emission from various basic antennas.

4. Intern must examine the mathematical formulation of the analysis.

5. Require knowledge on antenna operation and types as well as their usage in real time field.

6. Must be able to apply the basic principles and evaluate antenna parameters and link power budgets.

7. Intern should be familiar with design and assess the performance of various antennas.

## Antennas Internship Test

Intern has to take Antennas internship test in which they will be asked 50 multiple-choice questions. They have to score grade A or A* on this test to be eligible for the internship. Here’s a sample set of questions on the Antennas topic.

1. The equivalent area when multiplied by the instant power density which leads to free radiation of power at antenna is called as _______
(A) Loss area
(B) Scattering area
(C) Captured area
(D) Effective area

Explanation: Scattering area is the equivalent area when multiplied by the instant power density which leads to free radiation of power. Loss area leads to power dissipation and captured area leads to total power collection by the antenna. The relation among them is given by,
Captured area= effective area + loss area + scattering area.

2. Directive gain with maximum radiation intensity is called as Directivity.
(A) True
(B) False

Explanation: Directivity is defined as ratio of maximum power density in desired direction to the average power radiated in all directions. This is simply, maximum Directive gain. Maximum Directive gain is obtained if maximum radiation intensity is present in desired direction.

3. For the same current, the power radiated by half-wave dipole is four times that of the radiation by quarter wave monopole.
(A) True
(B) False

Explanation: The radiation resistance of a half wave dipole is 73Ω and that of a quarter wave monopole is 36.5Ω. So the power radiated by half-wave dipole is two times that of the radiation by quarter wave monopole.

4. The process of forcing the current at the outer side of the outer conductor to be zero is called _____
(A) Current distribution
(B) Current chokes
(C) Field effect
(D) Impedance chokes

Explanation: A Balun is a device which connects a balanced two –conductor line to an unbalanced coaxial line. It eliminates field mismatch. It forces the current at the outer side of outer conductor to be zero. This is called current choke.

5. In which of the following polarization the electric field components are perpendicular to each other and have unequal magnitudes?
(A) Linear
(B) Vertical
(C) Circular
(D) Elliptical

Explanation: In linear components are in the same plane. Vertical and horizontal are types in linear polarization. Circular polarization has electric field components are perpendicular to each other and have equal magnitude. In elliptic, the electric field components are perpendicular to each other and have unequal magnitude.

Practice the full set of Antennas Multiple Choice Questions before applying for the internship.

## How to apply for the Antennas Internship

1. Read the Sanfoundry Internship FAQs

2. Take the Antennas Internship Test 