论文信息 - Design, fabrication and test of a broadband high directivity directional coupler

Design, fabrication and test of a broadband high directivity directional coupler

Presented is an ultra-broadband stripline directional coupler with significant improvement in its directivity parameter which is of interest in many measurement applications. The main focus of this paper is on the influence of using shunt stubs as capacitance compensators to improve specifications of wideband directional couplers. This improvement is performed on a two-layer non-uniform line directional coupler working in 2-18 GHz band. Experimental results, for various classes of wideband stripline couplers loaded with these stubs, exhibit remarkable improvement in the directivity parameter.

[1] S. Gruszczynski,et al. Design of Compensated Coupled-Stripline 3-dB Directional Couplers, Phase Shifters, and Magic-T's—Part II: Broadband Coupled-Line Circuits , 2006, IEEE Transactions on Microwave Theory and Techniques.

[2] J. P. Shelton,et al. Synthesis and Design of Wide-Band Equal-Ripple TEM Directional Couplers and Fixed Phase Shifters , 1966 .

[3] R. Mongia. RF and microwave coupled-line circuits , 1999 .

[4] S. Gruszczynski,et al. Design of Compensated Coupled-Stripline 3-dB Directional Couplers, Phase Shifters, and Magic-T's—Part I: Single-Section Coupled-Line Circuits , 2006, IEEE Transactions on Microwave Theory and Techniques.

[5] C. P. Tresselt. The Design and Construction of Broadband, High-Directivity 90/spl deg/ Couplers Using Non-Uniform Line Techniques , 1966 .