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A Study on Broadband Hybrid Design Using Vertically Installed Planar Circuit with Partially Removed Ground Plane  

Kim In-Seon (Agency for Defense Development)
Lee Cheol-Soo (Agency for Defense Development)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.16, no.7, 2005 , pp. 661-670 More about this Journal
Abstract
In this paper, the microstrip $90^{\circ}$ hybrid to provide -3dB coupling and $90^{\circ}$ phase difference at broadband frequency range of 2 to 6 GHz is designed. This proposed hybrid is composed of 3-section. The two outside section are realized by symmetrical edge coupled lines, but on the other hand the middle section consists of VIP(Vertically Installed Planar) circuit. The ground part of VIP circuit is partially removed to get tight coupling, particularly. This hybrid is easy to realize due to microstrip structure and has good holing flexibility by taking advantage of VIP circuit as a control point of optimization. The proposed hybrid provide satisfactory performance as compared with simplicity of structure and fabrication first of all.
Keywords
VIP(Vertically Installed Planar) Circuit; Magnitude Balance; Phase Balance;
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