Modeling and Design of a Highly Efficient Switch-Mode RF/Microwave Power Amplifier Based-on Microstrip Bandpass Filter

— This paper presents a broadband Switch-Mode Power Amplifier (SMPA) using a Band-Pass Filter (BPF) at the Output Matching Network (OMN). The proposed SMPA integrates a microstrip BPF as an output impedance matching network to significantly reduce the final circuit size. The microstrip lines of the filter simultaneously play the role of filtering and impedance matching. This proposed method reduces the size of the PA and reduces the power dissipation as much as possible. The BPF is placed at the output of the circuit using microstrip lines and the RT Duroid 6006 substrate. This BPF covers a wide bandwidth ranging from 𝟑.𝟎 𝑮𝑯𝒛 𝒕𝒐 𝟒.𝟒 𝑮𝑯𝒛 . Simulation results show 𝟗 – 𝟏𝟒 𝒅𝑩 gain with 𝟒𝟒 – 𝟓𝟔.𝟔 % drain efficiency (𝑫𝑬 %) , and the output power of 𝟑𝟗 – 𝟒𝟏.𝟑 𝒅𝑩𝒎 would be achieved across the frequency band from 𝟑.𝟎 𝑮𝑯𝒛 to 𝟒. 𝟒 𝑮𝑯𝒛 .