2005•IEEE MTT-S International Microwave Symposium Digest, 2005.Requires access
A novel design of high directivity CPW directional coupler design by using DGS
Dong‐Joo Kim, Yong‐Woo Jeong, Jung-Hoon Kang, Jong-Hwa Kim, Chul-Soo Kim, Jong‐Sik Lim, Dal Ahn
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Abstract
A GBSC CPW (General Broadside Coupled Coplanar Waveguide) directional coupler with DGS (Defected Ground Structure) is presented, which has an excellent directivity. An even-odd analysis is performed for the GBSC CPW directional coupler with DGS. Using the analysis method, a high directivity directional coupler, which has an arbitrary coupling coefficient is designed. As an example, a 3dB coupler is fabricated and measured at 2GHz. The measured directivity of the directional coupler is higher than 44dB.