Abstract
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.
Highlights
High power, wide bandwidth, low-loss combiners or dividers with an average power handling capability of hundreds of Watts are used generally for combining high power amplifiers
Another 3-dB quadrature coupler using broadside-coupled coplanar waveguides [2] illustrates that the coupler with a broadside-coupled structure can be designed on a single-layer substrate printed circuit board, without using multi-layer substrates
The proposed coupler is able to be integrated in the status data transmitting system, which is suitable for vessel monitoring [20,21]
Summary
Wide bandwidth, low-loss combiners or dividers with an average power handling capability of hundreds of Watts are used generally for combining high power amplifiers. A 3-dB quadrature coupler which is suitable for printed circuit board implementation presented in [1] It shows that the coupler can reduce the drawbacks of conventional thin-film microstrip line Lange coupler with the advantages of coplanar waveguide coupled line structures. Another 3-dB quadrature coupler using broadside-coupled coplanar waveguides [2] illustrates that the coupler with a broadside-coupled structure can be designed on a single-layer substrate printed circuit board, without using multi-layer substrates.
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