S-Band Distributed 3-Port Circulator, 8 MW Peak Power, 10 KW Average Power, Patent No. 6,407,646 (Model #102483C)

S-Band Distributed 3-Port Circulator
8 MW Peak Power, 10 KW Average Power
Model #102483C, Patent No. 6,407,646


Unit Specifications

Peak Power 8 MW Center Frequency 2.998 GHz
Average Power 10 KW
Flanges CPR284F VSWR (Port 1) 1.10 max
Water Flow 4.5 GPM
Required Water Treatment Deionized Water
Water Temperature 25º to 40º C
(Port 1 to Port 3)
(Port 2 to Port 1)

>30 db
>35 db
Gas Pressure 35 PSIG SF 6
Length 19.5" (495 mm) Insertion
(Port 1 to Port 2)

<0.30 db
Weight 26 lbs. (11.8 Kg)
Probe Connector Type N Female


This high power S-Band circulator is based on EM Design’s unique patented concept.  It is especially attractive for isolating reflection from resonant loads such as accelerators or other similar devices.  This circulator is set for the 2.998 GHz frequency, but can be readily optimized for other frequencies, including 2.856 GHz.

Note that the power input, Port 1, and the 90º elbowed Port 3 have two variable insertion E-field probes (at each one) for monitoring and/or control signals.  These probes can be adjusted from the nominal -60 db coupling.  Typically, in isolator applications, a good high power load (such as EM Design’s Model #R284-3.0) is attached to Port 3 to receive power reflected into Port 2.  Please see Model #102647 or Model #102647A of this circulator packaged as an isolator.

The circulator is broadband, yet has very good narrow band specifications.  Our customers are pleased with the improved system performance achieved by this design.