Indian Institute of Technology Gandhinagar

Department of Electrical Engineering

EE 401 Communications Laboratory B.Tech: Electrical, Sem.: VII (2012-13)

EXPERIMENT 2 : ANTENNA

Objective: • To study different types of antennas:

o λ/2 (half wavelength) Dipole Antenna o Yagi-UDA 5-element Dipole Antenna o Yagi-UDA 7-element Dipole Antenna

• To measure the different parameters / characteristics of the antennas:

o Radiation Pattern o Beamwidth o Front-to-Back ratio o Gain o Polarisation o Radiation strength variation with distance. o Stub Matching o SWR Measurement

Indian Institute of Technology Gandhinagar Department of Electrical Engineering

EE 401 Communications Laboratory B.Tech: Electrical, Sem.: VII (2012-13)

EXPERIMENT 2 : ANTENNA

Antenna Trainer ST2261

1. Technical Specifications 3 2. Trainer Description 4 3. Basic Antenna Concept 9 4. Important Characteristics of Antenna 15 5. Experiment 1 : Arranging the Trainer and performing Functional Checks 20 6. Experiment 2 : Study of Simple Dipole (λ/2) Antenna 24 7. Experiment 3 : To perform the Polarisation Test 26 8. Experiment 4 : Study of the variation in the Radiation Strength with the Distance 27

from the Antenna

9. Experiment 5: Use of the Matching Stub 28 10. Experiment 6 : SWR Measurement 30 11. Experiment 7 : Study of Yagi-UDA 5 element Simple Dipole 31 12. Experiment 8 : Study of Yagi-UDA 7 element Simple Dipole 32 μA to dBμA Conversion Chart 34 Polar Graph 35 2