An Interdigitated Coupler with Defect Ground Structure
Nanjing University of Posts and Telecommunications Nanjing China
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In this paper, an interdigitated coupler with defect ground structure in the coupling position is presented. Compared to the conventional interdigitated coupler, the proposed coupler loosens restrictions of the coupling-line width and space between coupling lines. As a result, the requirement of fabricating accuracy for the new coupler is lowered. In addition, with the introduction of suitable defect ground structure, the bandwidth of the coupler can be improved substantially. The designed 3-dB coupler has the coupling strength of -3dB0.8dBwithin the passband of 2 through approximately 8GHz, while both the isolation response and the return loss are lower than -20dB.
- Electrical and Electronic Equipment
- Electric Power Production and Distribution
- Radiofrequency Wave Propagation