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http://dx.doi.org/10.7840/kics.2015.40.2.355

3-Port Circulator for X-Band Radar  

Yoon, Sung-Hyun (경남정보대학교 정보통신계열)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.40, no.2, 2015 , pp. 355-362 More about this Journal
Abstract
In this study, we have fabricated 9.385[GHz] circulator that is composed of WR112 waveguide and Ferrite for X-band radar. For designing Ferrite, B/R mode(Below Resonance mode) was used and calculated the condition of 120 degree rotation of the electric field in Ferrite and calculated internal DC magnetic field and external DC magnetic field. Also, dielectric materials of the same shape with Ferrite was filled between two Ferrite for improving the performance of the circulator, including impedance matching, bandwidth, quality factor, insertion loss. To obtain optimum shape of the Ferrite and dielectric material, we used CST MWS. Simulation result of the circulator is that 1.02 : 1 VSWR, -40dB isolation, 0.2dB insertion loss and measurement result is that 1.03 : 1, -38dB, 1.2dB at 9.385[GHz]. We can get good agreement at isolation and VSWR, but insertion loss was 1 dB great than simulation result.
Keywords
X-band radar; circulator; ferrite; B/R mode; internal magnetic field;
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