The Optimization Methods Of Low Noise Amplifier (LNA) Working In Radio Frequency And The Analysis Of Photonic Bandgap (PBG) Microstrip Structure Filter

With the rapid development of technolofy, the radio frequency integrated circuits (RFIC) have a very broad range of applications. As a result, RF front-end IC and devices have become one of the most active research areas in wireless communications. This paper mainly focuses on two issues of RF transceiver.The first part: the optimization methods of Low Noise Amplifier (LNA) working in radio frequencyThis part gives an introduction of radio frequency integrated circuits and MOSFET characters at first. Then there is a systematical analysis of the low noise amplifier especially the cascade structure low noise amplifier. On the base of the optimization of source, a method to optimize the whole performance is given by adjusting the channel width of gate. At last a 2.4GHz LNA is designed to prove the method.The second part: the analysis and design of photonic bandgap (PBG) microstrip structure filterThis part gives an introduction of microwave filter and photonic bandgap structure and presents a one dimensional (1D) photonic bandgap (PBG) microstrip structure filter. This device consists of a 50Ω microstrip transmission line and a PBG ceramic substrate. The structure exhibits a well-defined stopband. S-parameter simulation result are presented. The simulated result with 3D full wave electromagnetic analysis using HFSS are in good agreement with the data of other papers. At last the relationship of geometrical indexes and fiter performance is analyzed.