RAIN RFID Reader Antenna

Two primary types of RFID Reader Antenna are Linear Polarization and Circular Polarization. The decision between these two types depends on the specific needs of the application. Linear polarization is best suited when the orientation of the RFID tag is fixed and known. In contrast, Circular Polarization is more appropriate when the tag orientation is uncertain or variable.

Directional: Linearly polarized antennas emit radio waves in a single plane or direction. These waves are typically either horizontally polarized (parallel to the ground) or vertically polarized (perpendicular to the ground).

Omnidirectional: Circularly polarized antennas emit radio waves in a circular pattern, which is more forgiving when it comes to tag orientation.

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Product Description

RFID Reader Antenna Specification:

Technical Parameters
Frequency	860-928MHz	860-928MHz
Gain	9dBi	12dBi
Beam width	Hor: 70°Ver: 70°	Hor: 45 Ver: 45°
Polarization	Circular	Circular
VSWR	≤1.4	≤1.3
F/B Ratio	≥20	≥25
Impedance	50Ω	50Ω
Maximum power	50W	1000W
Lightning protection	DC Ground	DC Ground
Connector	SMA-Female	SMA-Female
Physical Specifications
Dimension	26026045mm	44544540mm
Net weight	1.75kg	2.3kg
Packing size	453514.5cm	604811cm
Gross weight	2kg	4.25kg
Radome material	ABS	ABS
Radome colour	White	White
Pole diameter	Φ40-60mm	Φ40-80mm
Wind Velocity	60m/s	60m/s
Operating temperature	-40~70°C	-40~70°C

Linear Polarization (dipole antennas) Features:

✓ Electromagnetic waves propagate exclusively within a singular plane, either vertically or horizontally, aligned with the direction of signal propagation.

✓ Linear polarization is most effective when the orientation of the RFID tag remains consistent and known.

✓ Optimal read rates are achieved when the RFID antenna's polarization matches that of the RFID tag (e.g., if the antenna employs vertical polarization, the tag should also be vertically polarized).

Circular Polarization Features:

✓ Electromagnetic waves exhibit a spiral, corkscrew-like propagation, completing one full revolution within a single wavelength duration in the case of circular polarization.

✓ Circular polarization offers benefits in scenarios where the orientation of the RFID tag is uncertain or subject to variation.

✓ Circularly polarized antennas emit a rotating electromagnetic field, enveloping tags from diverse orientations encountered in their path.

✓ Nevertheless, it's important to note that circular polarization incurs a minimum 3dB (decibel) loss when contrasted with linear polarized antennas, potentially influencing read range and overall performance.

It's important to note that Circular Polarization may result in a slight reduction in signal strength compared to Linear Polarization. Each polarization type has its own set of advantages and factors to consider, and the choice should be driven by the unique use case and operational needs at hand.

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