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ANT-2.4-CW-RCL-xxx Data Sheet by Product Description 6.0 mm (0.24 ) The RCL Series is useful in products where additional height above the products case is needed or a slightly wider operational bandwidth is desired. The 2.45GHz version has a center-fed -wave element with an internal ground reference. The antennas attach via a standard SMA or Part 15 compliant RP-SMA connector Features Right-angle mount Reduced-height whip Excellent performance Omni-directional pattern 88.0 mm (3.46 ) Fully weatherized Rugged & damage-resistant SMA or Part 15 compliant RP-SMA connector 10.5 mm (0.41 ) Electrical Specifications Center Frequency: 2.45GHz Recom. Freq. Range: 2.402.50GHz Wavelength: -wave VSWR: 1.9 typical at center Peak Gain: 1.1dBi Impedance: 50-ohms Connector: SMA or RP-SMA Oper. Temp. Range: 20C to +85C 8.0 mm (0.31 ) Electrical specifications and plots measured on 10.16 cm x 10.16 cm (4.00 x 4.00 ) reference ground plane 16.6 mm (0.65 ) Ordering Information ANT-2.4-CW-RCL (with RP-SMA connector) ANT-2.4-CW-RCL-SMA (with SMA connector) 1 Revised 1/15/15VSWR Graph VSWR 1.470 Reflected Power 3:1 25% 2:1 11% 1:1 0% 1950MHz 2450MHz 2950MHz What is VSWR The Voltage Standing Wave Ratio (VSWR) is a measurement of how well an antenna is matched to a source impedance, typically 50-ohms. It is calculated by measuring the voltage wave that is headed toward the load versus the voltage wave that is reflected back from the load. A perfect match will have a VSWR of 1:1. The higher the first number, the worse the match, and the more inefficient the system. Since a perfect match cannot ever be obtained, some benchmark for performance needs to be set. In the case of antenna VSWR, this is usually 2:1. At this point, 88.9% of the energy sent to the antenna by the transmitter is radiated into free space and 11.1% is either reflected back into the source or lost as heat on the structure of the antenna. In the other direction, 88.9% of the energy recovered by the antenna is transferred into the receiver. As a side note, since the :1 is always implied, many data sheets will remove it and just display the first number. How to Read a VSWR Graph VSWR is usually displayed graphically versus frequency. The lowest point on the graph is the antennas operational center frequency. In most cases, this will be different than the designed center frequency due to fabrication tolerances. The VSWR at that point denotes how close to 50-ohms the antenna gets. Linx specifies the recommended bandwidth as the range where the typical antenna VSWR is less than 2:1. Data Sheet ANT-2.4-CW-RCL-xxx 2 by