Single junction circulators lower IMD in cellular base stations By Jean-Pierre Joosting Microwave Engineering April 21, 2008 (02:52 PM EST)   Greensboro, NC — RF Micro Devices has introduced five single junction circulators for wireless infrastructure applications, comprising the PC0882AG-21H, PC0940AG-21H, PC1843AG-21H, PC1960AG-21H and PC2140AG-21H. Each circulator delivers excellent electrical performance and rugged construction required by the demanding operational requirements of the high power, linear amplifier and transceiver sections of cellular base stations, repeaters and other forms of transmission equipment. The single junction circulators are manufactured with samarium cobalt (SmCo) magnets packaged in aluminum housings, providing immediate improvements in reliability and performance versus existing generations of circulators. The PCxxxAG-21H line of single junction circulators is specifically designed to cover the five major cellular frequency bands from 869 MHz to 2170 MHz, while exhibiting excellent intermodulation distortion (IMD) performance, low insertion loss and high isolation. All of the "drop-in" single junction circulators are offered in industry standard 2.54 x 2.54 cm (1 x 1 inch) packages for ease of implementation, and all are lead-free and RoHS compliant. Visit http://www.rfmd.com for further information.