| Paper | Title | Page |
|---|---|---|
MOPPA028 |
Design and Simulation of 505.8 MHz Strip Line Ferrite Circulator for Indus 2 | |
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| Circulator is an amazing device which can couple the power entering in anyone of its ports to the next port in one rotation only, and offers high isolation in reverse direction. Circulators find most wide applications in RF systems as a duplexer, and as an isolator with third port terminated with matched load. In particle accelerators ferrite circulators are used for the attenuation of reflected back power from a mismatched load or cavity to RF source to avoid the damage of RF source. To meet this requirement a strip line ferrite circulator has been designed and simulated using CST MICROWAVE STUDIO at 505.8 MHz for Indus 2 applications. Circulator geometries and biasing DC fields have been optimized (above resonance), and good results are observed with high reflection of 27 dB, with 30 dB isolation and 0.4 dB insertion loss. A MATLAB program has been developed for automatic calculations of circulator geometries, for given frequency and design parameters. Also thermal analysis has been done by observing the temperature rise with input power using thermally coupled simulation in CST Microwave studio. For 1000 watt input power maximum temperature in the circulator is 79 C without any forced cooling. This paper presents the design aspects, calculations and electromagnetic and thermal simulation of ferrite circulator. | ||