We all have read much about RFID tags, these little pieces of technology that have brought such advancements in our industries. However, we often forget about the other part of the equation, the readers, after all, they are the ones that identify the tag signal and send it forward to us. An integral component of an RFID reader is its antenna. There are several types of antennae available in the market, all suitable for different kinds of applications. One such type is a Linear Polarised Antenna.
Today, we will discuss these types of antennas and why you should choose one for your needs.
What is a Linear Polarised Antenna?
The direction of polarization is one of the classification systems for RFID antenna. Based on this, you can divide antennae for RFID readers into two types, namely – Linear and Circular Polarised Antenna. Linear polarised antenna broadcast radio signals along a single plane. In a linear system, the RFID tags also need to be kept on the same plain as the antenna. As a signal travels, it expands and loses energy. However, since linear polarised antenna signals only travel along a single plain, it loses a lot less energy as compared to a Circular Polarised Antenna. Giving them a longer broadcast range.
Meaning of 9dBi in Linear Polarised Antennas
dBi is the standard unit to measure the Gain of an antenna. In electronic terms, Gain refers to the increase in power an antenna can broadcast in a particular direction. Let’s get a bit technical, according to the inverse square law, the energy of an electromagnetic wave decreases by the square of the distance it has covered. This happens because as the signal travels, it spreads out and starts to dissipate. Therefore, if you keep the energy input constant, then narrower beams will travel longer. Decibels Relative to Isotropic (dBi) work on this exact principle. The lower the dBi of an antenna, means that it transmits over a wider angle, therefore, having less gain.
9dBi antennas are particularly popular in a variety of industries due to their almost perfect balance of broadcast signal and angle of coverage.
Significance of Implementing a 9dBi Linear Polarised Antenna
As stated above, an antenna with 9dBi gain provides an amazing ratio between the distance and coverage of your broadcast. This makes it perfect for a wide variety of applications, as 9dBi antennas are good at a reading high volume of tags and have a long enough range to make it practical for industrial uses.
There are several 9dBi Linear Polarised Antenna that you can select from, for example:
9dBi Linear Polarised Antenna FAQs:
Q1. Which polarization is best for antenna?
Ans: The answer to this question depends solely on your application and needs. Meaning, there are benefits and shortcomings to both linear & circular polarised antennas. Linear antennas have a good range; however, they can only read tags that are kept on the same plane as them. On the other hand, a circular polarised antenna offers a remarkably better coverage zone as it broadcasts signals along a helical axis. But due to the inverse square law, it also decreases their broadcast range severely.
In short, before picking an antenna, keep in mind a few factors like the size of the facility, the Gain of the Antenna (angle of the signal coverage) & orientation of the tags compared to the antenna.
Q2. What are the advantages of linearly polarized antenna?
Ans: There are two major advantages that linear polarised antennas have over circular ones, namely-
(A). Linear polarised antenna provides longer broadcast and read ranges.
(B). They are much more cost-efficient than Circular Polarised Antennae.
Q3. What are the two types of linear polarization?
Ans: As the name suggests, linear polarised antennas broadcast signals along a single axis, either the X-axis or the Y-axis. Therefore, there are two types of linear polarisations, namely – vertical and horizontal. Vertical polarisation means the signals travel perpendicular to the surface. And horizontal means that the path of the signal is parallel to the surface.
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