1. Unit-4 Antenna Measurements and Antennas for Mobile Applications

7. Adaptive Array Schemes

10. Smart Antenna Benefits
Capacity Increase
Increase in Signal-to-Interference Ratio(SIR)
Range increase
Security
Because of spatial detection nature, they can be used to locate humans in case of emergency.

13. Antenna Measurements
Performed with test antenna in the receiving mode.
Test antenna illuminated with plane waves of uniform phase and amplitude.

14. Antenna Ranges
Facilities are classified as Outdoor ranges and Indoor Ranges.
2 basic types of antenna ranges
Reflection Ranges
Free Space Ranges
Elevated Ranges
Slant Ranges
Anechoic Chamber
Compact Ranges
Near- Field Ranges

16. Anechoic Chamber

17. Radiation Pattern Measurement
Pattern of Antenna is 3-dimensional.
Impractical to measure 3-dimensional-a number of 2-dimensional patterns are measured.

19. Instrumentation for Radiation Pattern Measurement
Source antenna and Transmitting System
Receiving System
Positioning System
Recording System
Data-Processing System

20. Amplitude Pattern Measurement

22. Phase Pattern Measurements

23. GAIN MEASUREMENTS Two methods Absolute-gain method
Two- antenna Method
Three-Antenna Method
Extrapolation Method
Ground-Reflection Range Method
Gain-Transfer (or Gain Comparison) methods

24. Two-Antenna Method

25. Three-Antenna Method

26. Directivity Measurements