A miniaturised multiband inkjet printed Quadrature Hybrid Coupler is proposed in this paper. The design and flexibility characterization of an inkjet-printed coupler on a flexible 50 μm polyimide film (Kapton) substrate is presented. Kapton is chosen due to its good balance of physical, chemical and electrical properties with a low loss factor of 0.0021. The coupler is designed to operate at 1.5 GHz, 4.5 GHz, 6.0 GHz, 7.5 GHz and 9.0 GHz. The circuit was simulated and the simulation results are presented. The coupler will be fabricated and test results will be presented. The proposed QHC size is 78% smaller than the conventional QHC.
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