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Examination Questions

The document outlines examination questions for the course CRL724 on Standard Procedures for Antenna Measurements, covering various topics such as measurement environments, coordinate systems, antenna pattern measurement methods, and gain measurement techniques. It also addresses practical challenges, calibration, and transformation methods between near-field and far-field measurements. Each lecture focuses on specific aspects of antenna measurement, including polarization and compact antenna test ranges.

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sagar
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14 views2 pages

Examination Questions

The document outlines examination questions for the course CRL724 on Standard Procedures for Antenna Measurements, covering various topics such as measurement environments, coordinate systems, antenna pattern measurement methods, and gain measurement techniques. It also addresses practical challenges, calibration, and transformation methods between near-field and far-field measurements. Each lecture focuses on specific aspects of antenna measurement, including polarization and compact antenna test ranges.

Uploaded by

sagar
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Examination questions for CRL724 “Standard Procedures for Antenna Measurements”

Lecture 1: Introduction to Antenna Measurement Procedures

• Purpose of antenna measurements

• Different measurement environments: Free space, Anechoic chambers, Open ranges

• IEEE standards and best practices

Lecture 2: Coordinate Systems and Measurement Parameters

• Spherical coordinate system in antenna measurements

• Radiation pattern definitions: Amplitude, Phase, Polarization

• Near-field and Far-field concepts

Lecture 3: Antenna Pattern Measurement Methods

• Directivity and Beamwidth measurement

• Pattern cuts: Great-circle, Conical, Principal-plane

• Understanding Far-field conditions

• Conversion of Near-field Measurements to Determine Far-field Radiation Patterns

Lecture 4: Sampling Techniques in Radiation Pattern Measurement

• Data acquisition in spherical coordinates

• Discrete measurements and interpolation

• Practical challenges in antenna measurements

Lecture 5: Range Measurements and Chamber Setup

• Indoor vs. Outdoor measurement setups

• Free-space, Elevated, and Slant ranges

• Anechoic chambers and their design considerations

Lecture 6: Antenna Gain Measurement Techniques

• Two-antenna, Three-antenna, and Gain-comparison methods

• Friis transmission equation

• Practical considerations in gain measurements

• Calibration of Reference Antennas and Measurement Uncertainty

Lecture 7: Polarization Measurement Methods

• Determining polarization patterns


• Axial ratio and Tilt angle measurement

• Three-antenna polarization measurement

• Polarization Matching and Mismatch Loss in Real Systems

Lecture 8: Near-Field to Far-Field Transformation

• Planar, Cylindrical, and Spherical near-field techniques

• Fourier transform methods for field transformation

• Data processing for far-field predictions

Lecture 9: Compact Antenna Test Ranges (CATR)

• Collimating reflectors and Quiet zones

• Phase errors and Amplitude ripple reduction

• Measurement uncertainties and calibration techniques

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