ANT-2.4-CW-CT-xxx Data Sheet by Product Description 10.0 mm The CT Series -wave 2.4GHz antenna delivers (0.39) outstanding performance in a rugged and cosmetically-attractive package. The antennas internal counterpoise eliminates external ground plane dependence and maximizes performance. CT Series antennas attach using a standard SMA or Part 15 compliant RP-SMA connector, though alternate connectors and custom colors are available for volume OEM customers. Features Internal counterpoise Excellent performance 84.0 mm Omni-directional pattern (3.31) Very low VSWR Fully weatherized Rugged and damage-resistant 113.0 mm (4.44) Standard SMA or Part 15 compliant RP-SMA connector Electrical Specifications Center freq. 2.45GHz Bandwidth: 150MHz Wavelength: -wave 20.0 mm (0.79) Peak Gain: 2.8dBi VSWR: <1.9 typ. at center Impedance: 50-ohms 9.0 mm Connector: RP-SMA or SMA (0.35) Oper. Temp. Range: 40C to +90C Electrical specifications and plots measured on 10.16 cm x 1016 cm (4.00 x 4.00 ) reference ground plane Ordering Information ANT-2.4-CW-CT-RPS (with RP-SMA connector) ANT-2.4-CW-CT-SMA (with SMA connector) 1 Revised 11/22/13VSWR Graph VSWR 1.113 Reflected Power 3:1 25% 2:1 11% 1:1 0% 2.35GHz 2.45GHz 2.55GHz 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. 159 Ort Lane, Merlin, OR, US 97532 Phone: +1 541 471 6256 Data Sheet ANT-2.4-CW-CT 2 Fax: +1 541 471 6251 by www.linxtechnologies.com