Unit-4 Antenna Measurements and Antennas for Mobile Applications

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Presentation transcript:

Unit-4 Antenna Measurements and Antennas for Mobile Applications

Adaptive Array Schemes

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.

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

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

Anechoic Chamber

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

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

Amplitude Pattern Measurement

Phase Pattern Measurements

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

Two-Antenna Method

Three-Antenna Method

Directivity Measurements