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Advantages of Linear Polarization | Disadvantages of Linear Polarization

This page covers advantages and disadvantages of Linear Polarization and its basics. It mentions benefits or advantages of Linear Polarization and drawbacks or disadvantages of Linear Polarization.

Introduction Polarization refers to directional aspects of E-field (i.e. electric field) of EM (Electromagnetic) radio signal. It allows frequency reuse to enhance satellite capacity. There are two types of polarization viz. linear polarization and circular polarization.

What is Linear Polarization?

The polarization in which electric field lies wholly in one plane which contains direction of propagation is known as linear polarization. Linear polarization is divided into horizontal and vertical types based on in which plane E-field lies. EM waves consist of E-field (Electric field) and H-field (magnetic field). Both E-field and H-field are perpendicular i.e. 90 degree out of phase with each other.

Linear Polarization

• Horizontal polarization : In this linear polarization type, electric field lies in a plane parallel to the Earth's surface.
• Vertical polarization : In this type, electric field lies in a plane perpendicular to the Earth's surface.

Benefits or advantages of Linear Polarization

Following are the benefits or advantages of Linear Polarization:
➨It offers better cross pol isolation.
➨It makes cost of antenna system lower.
➨It offers longer read range for RFID reader compare to circular polarization.

Drawbacks or disadvantages of Linear Polarization

Following are the drawbacks or disadvantages of Linear Polarization:
➨Polarization adjustment required.
➨Polarization changes as per latitude and longitude of the place.
➨Greater chance of problems due to cross pol interference.
➨Linearly polarized waves are subjected to faraday rotation in the ionosphere layer.
➨Unlike circular polarization based RFID reader, linear polarization based RFID reader requires to be on same plane and height as RFID tags. Moreover RFID reader should know the tag orientation.

Circular Polarization

Refer advantages and disadvantages of Circular Polarization >>.

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