The 3G2BF from Renaissance Electronics is a drop-in circulator that operates from 500 to 690 MHz. It can handle up to 350W and has an insertion loss of 0.7 dB over a -20 to 95 degrees C temperature range. The G2BF has a VSWR of 1.50:1 and available in a compact size of 2.125 x 2.125 x .63 inches. It can be used in military radios and broadcast applications.