A design of wideband high-power 3-dB quadrature coupler using defected ground structure for status data transmitting system

Nguyen Dinh The Anh, Hoang Duc Long, Bach Gia Duong, Dragos Dancila


The paper presents a wideband 3-dB quadrature coupler designed for operation at 2 GHz. The presented coupler is based on a broadside- coupled suspended structure in combination with a proposed defected ground structure (DGS) allowing for high power, wide-band and improved harmonic suppression performance. The experimental results show 0.2 dB of insertion loss, return loss of better than 18 dB and isolation of better than 25 dB in the frequency range from 1.74 to 2.67 GHz. The proposed coupler is able to be integrated in the status data transmitting system, which is suitable for vessel monitoring. The fundamental characteristics of the implemented coupler have been measured and verified.

erun:yes'>  2012. He is currently pursuing the Ph.D. degree at FREIA laboratory, Uppsala University Sweden. His current  research interests  include  the area of RF PA design.



3-dB quadrature coupler Defected ground structure RF combiner, divider Status data transmitting system Vessel monitoring system


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