Abstract
A novel planar coupler with Defect Ground Structure (DGS) is proposed for application to the dual-band operation. In the new design, two cross coupling branches are added to the conventional branch line coupler at the middle. They give more flexibility to design for dual-band application. Using the DGS, high impedance microstrip line is implemented easily and the electrical length of microstrip line increases. The two operation frequencies could be designed more closely using high impedance implemented by DGS. For verification purpose, a compact microstrip dual-band coupler applied for TD-SCDMA and WiMax operation was designed, fabricated and measured. Experimental results are in agreement with predicted values.
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