The F2805 from WENTEQ Microwave is a range of coaxial circulators that operate from 20 to 50 MHz. They have an isolation of more than 18 dB, an insertion loss of less than 1.3 dB and a VSWR of less than 1.35:1. These devices can handle up to 30 W of CW power with 8% bandwidth. They are available with SMA or N-type female connectors.
