.2.4 Ghz Receiver Rf Front-end Design

When the source of spectrum becoming more and more scarce, the design and research of the receiver working in 2. 4GHz ISM frequency range is very important in the field of wireless communication. This paper focuses on the the architecture of RF receiver and the key parts in the RF receive front-end, including the theory, design and test of this part, each all in details. There are seven chapters in this paper. In the first chapter, the author show the backgroud of this topic, point out the importance of the design of 2. 4GHz receiver, and say the main task of this paper; then the author systematacially elucidate the ABC of RF&common architectures of RF receiver in the second chapter, based this, the collectivity targets of the receiver and the performance features of every part are given, then the selectivity, gain and performance of the mixer of the receiver were all simulated;in the third chapter, the author discuss the working element and main performance features of the low noise amplifier(LNA),then design the LNA with the ADS—a authoritative electronic emulate software used in radio frequency, and make the LNA met all predesign features;in the fourth chapter, the commen sense of mixer first been introduce, then, the theory of how the mixer works was dissertated systemically, and then the hybird balance mixer was designed by using ADS;the design and simulation of the 2.4GHz circularly polarized microstrip antenna was done in the fifth chapter, after designing the unit microstrip antenna, the simulation of the 2X2 array was also done; in the sixth chapter the designed LNA, mixer and microstrip antenna were made and tested;in the last chapter, all work were concluded, and the follow task were brought forward.The 2. 4GHz RF receive front-end in this paper is a part of the lab project of 2.4GHz wireless video transmission.it will have a very good application foreground. The LNA in this paper is designed in the way of source grouding, so it has a very good NF in a wideband;the CP microtrip antenna in the paper use the sequential rotated method to spread the band, its feed way is side feed, because array methods&broad bandwidth methods is used, it performaces well.