ANT-2.4-WRT-MON-ccc Data Sheet by 19.0mm Product Description (0.75 ) The WRT-MON Series monopole antenna is compact and tamper-resistant. Its great for applications like wireless vending machines, traffic 27.0 mm equipment and power equipment where space is Adhesive Ring (1.06 ) Remove protective limited and security is important. plastic before installation SMA or Unlike the WRT Series dipole antenna, the RP-SMA or U.FL 8.5 mm WRT-MON Series monopole antenna requires (0.34 ) a proximity ground plane, which dramatically 10.3 mm 7/16-28 i-PEX silouette reduces the space required inside the product. UNEF-2A (0.41 ) shown in shadow Thread The antenna is designed to be installed onto a conductive surface with the metal base and nut electrically connected to the surface serving as the counterpoise. The antenna installs through a small hole on the product and is anchored by a threaded metal base connected to the coax cable shield. An adhesive foam compression ring resists the elements. The WRT-MON Series antenna is available in 2.45GHz. Its attached to a 216.0 mm (8.5) long coax cable with an RP-SMA, SMA or U.FL/ MHF-compatible connector on the other end. The RP-SMA and SMA connectors use an RG-174 Cable Length 216.0 mm coax. The U.FL/MHF connector uses a 1.32 mm (8.50 ) micro-coax. More connectors, colors and coax length options are available for OEM customers. Electrical Specifications Center Frequency: 2.45GHz Features Recom. Freq. Range: 2.402.50GHz Compact Bandwidth: 100MHz Tamper resistant Wavelength: -wave Low cost VSWR: 1.9 typical at center Indoor / outdoor Peak Gain: 0.8dBi max Impedance: 50-ohms Ordering Information Cable: RP-SMA, SMA: RG-174 ANT-2.4-WRT-MON-RPS (with RP-SMA connector) U.FL: 1.32 mm ANT-2.4-WRT-MON-SMA (with SMA connector) ANT-2.4-WRT-MON-UFL (with U.FL / MHF Connection: RP-SMA, SMA, U.FL/MHF compatible connector) Oper. Temp. Range: 40C to +85C Max. Recom. Torque: 4.0 kgf-cm Electrical specifications and plots measured on 10.16 cm x 10.16 cm (4.00 x 4.00) reference ground plane 1 Revised 12/15/2017Counterpoise Quarter-wave or monopole antennas require an associated ground plane counterpoise for proper operation. The size and location of the ground plane relative to the antenna will affect the overall performance of the antenna in the final design. When used in conjunction with a ground plane smaller than that used to tune the antenna, the center frequency typically will shift higher in frequency and the bandwidth will decrease. The proximity of other circuit elements and packaging near the antenna will also affect the final performance. For further discussion and guidance on the importance of the ground plane counterpoise, please refer to Linx Application Note AN-00501: Understanding Antenna Specifications and Operation. VSWR Graph VSWR 1.458 Reflected Power 25% 3:1 11% 2:1 1:1 0% 2350MHz 2450MHz 2550MHz 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 has 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 is 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. Copyright 2017 Linx Technologies 159 Ort Lane, Merlin, OR 97532 Phone: +1 541 471 6256 Fax: +1 541 471 6251 2 ANT-2.4-WRT-MON-ccc Data Sheet www.linxtechnologies.com by