By the theory of Bethe-hole coupling, a new modified multi-hole directional coupler based on the ridged rectangular waveguide is proposed in this paper. Three kinds of coupling-hole configurations, ...

In this paper, Analog Pre-distortion techniques are designed at 3.5 GHz to produce linearity for PA. Firstly, the individual blocks like Wilkinson Power Divider (WPD), Hybrid Coupler (HC), Rat-race ...