Development Of WiFi 6E Miniaturized Receiver Front-end Based On LTCC

As the focus of wireless system research,the front end of the receiver affects the performance of the communication system.With the increasing requirements for WiFi technology speed and latency,WiFi 6E,an upgraded version of the sixth-generation wireless technology standard,has gradually entered people’s field of vision.As an emerging wireless local area network technology in recent years,it has been favored by people for its high-speed,large bandwidth,low latency,and low power consumption characteristics.It can be widely applied in various scenarios such as video,games,and smart homes,providing more convenience for people’s lives.Therefore,it is important to design a receiver front end with high performance and miniaturization that is suitable for this technical standard.Low Temperature Co-fired Ceramic(LTCC)technology has the advantages of high integration and high performance due to the characteristics of threedimensional integrated packaging,making the microwave device designed and realized have the advantages of high integration and high performance,and has become one of the preferred solutions for receiver front-end design.This project aims to develop an LTCC-based WiFi 6E miniaturized receiver frontend,the core components of which include a low-noise amplifier and an LTCC-based miniaturization filter.Through theoretical analysis and research,the miniaturized highperformance receiver front end that meets the needs of WiFi 6E frequency band is finally realized.For the development of filters based on LTCC,this article introduces the theory of comb line resonators,analyzes the equivalent circuit and coupling characteristics of resonators,and designs two miniaturized filters with high out of band suppression.The resonator structure using multi-layer folded stripline and short-side compensated stripline achieves the design requirements of high quality factor and miniaturization.The insertion loss of the first sixth-order comb line filter designed by simulation is within 0.51 d B to1.42 d B,and the return loss is better than 15.51 d B,and two transmission zero points are introduced by using the Z-shaped cross-coupling structure,and the out-of-band rejection at low frequencies is better than 45 d B,and the rectangular coefficient is better,realizing the performance requirements of high out-of-band rejection.The insertion loss of the second seventh-order cross-finger filter is within 0.71 d B to 1.37 d B,the return loss is better than 15.26 d B,and the out-of-band suppression is better than 40 d B,and the position of the two transmission zero points generated by parasitic coupling is effectively controlled by etching the defective structure of the rectangular groove in the ground shield layer,and the parasitic pass belt is suppressed to a certain extent.According to the system indicators,a low-noise amplifier was selected and designed,and the performance of the low-noise amplifier chip was verified,and then it was processed and assembled and tested.A low-noise amplifier with a gain greater than 17 d B and a noise figure of less than 2d B is implemented.Later,by integrating a low-noise amplifier and filter,a WiFi 6E miniaturized highperformance receiver front end was obtained.Finally,the performance test is carried out,and the measured results show that the operating frequency of the front end of the receiver is 6.16 GHz to 7.08 GHz,the gain and flatness are 14 d B±1d B,the return loss is better than10 d B,the stopband suppression is better than 40 d B,and the noise figure is better than2 d B,which basically meets the design requirements.