Research And Application Of The Six-port Technology

Six-port technology is proposed by Hoer of national bureau of standards USA in1972, which was initially applied to the design of automatic network analyzers inmicro-wave measurement. It is composed of passive components including the powersplitter and power bridges, so its structure is very simple. Moreover, the six-port circuithas the ability of accurately measuring amplitude and phase of reflection coefficient. Sothe six-port technology has been developing rapidly and using in a wide range ofapplications in the field of wireless communication. This paper is about the applicationfor zero-IF receiver based on six-port technology in the phase measurement.This paper first introduces the principle of the six-port technology, the calibrationmethods and its development situation. Then we designed an improved UWB six-portjunction based on six-port technology. By the emulation and measurement of itsperformance in the frequency band, we proved the feasibility of this six-port junction.Finally, a six-port direct conversion receiver front-end is designed according to therequirement of the project. This front-end includes several independent modules, suchas the matrix switch, the digitally controlled attenuator, the limiting amplifier, the powerdetection circuits, the six-port junction circuit and the differential amplifie. The overallstructure is divided into five layers, and this kind of structure can not only avoidcrosstalk but also make the assembly and debugging convenient.At the end of this paper we gives data results and the summary, and the resultsprove that the design fully meet the indicators given by the user.