Antenna and RF Subsystem Integration in Cellular Communications

摘要

We discuss in this article a number of techniques that can be used to improvethe RF performance on a mobile device. All those techniques rely on tight antenna and modem subsystem codesign. In a short introduction, the articleoutlines the need of these techniques, based on the advent of new wireless standards and demanding power and size requirements. The first technique isbased on integrating the antenna as part of the RF filtering chain to relax therequirements of current duplex filters up to 30dB off-band. We also outlinea discussion on the different approaches for adaptive antenna matching, depending on the system’s requirements. A particular antenna concept thatimplements two different wireless systems (LTE and Wi-Fi) is outlined in a subsequent section. Such a structure can reduce the volume required for antennas on a mobile device. The article concludes with an example of howthe antenna design can directly impact the throughput of the whole system,showing the impact of the correlation coefficient on the signal to noise ratio.