The Research On 33～37GHz Of Broadband Transceiver Module

In this era of information explosion, the bandwith and transmission speed of traditional RF and microwave technology has been unable to meet the application requirements as the basis for wireless communication. At the same time, all kinds of interference can not be avoided since the band of RF and microwave is very crowded. Millimeter wave technology is rapidly becoming the mainstream of wireless technology development, owing to its wide bandwith, high speed, and high integration and so on. As a key part of the millimeter wave wireless systems, millimeter wave transceiver assembly performance is critical to the overall system. In this paper, millimeter wave transceivers were studied, and a 33～37GHz broadband transceiver module which works in Ka band has been developed.Starting with the background and significance of the subject, a brief introduction of the domestic and international developments in the millimeter wave transceiver has been made in this paper.We also dicussed the common receiver and transmiiter programs and their pros and cons.Then the overall scheme of the system has been determined, combined with the design specifications of the subject.Superheterodyne architecture has been adopted in reciving channel and transmitting channel, and the signal frequency is the same for both channels while the transceiver works in time division duplex(TDD) mode. The transceiver is realized by using plane hybrid integrated circuits technology because of its maturity and the actual conditions that we have. For the convenience of circuit design and debugging, the transceiver is divided into three modules, including the local oscillator-frequency shift module which provides the local oscillator signal and the reference signal for the other modules, the excitation frequency conversion module which converts the baseband signal to transmission IF signal, and the millimeter module which works for signal reciving and transmitting. The circuit designs and testing results has been detailed in this paper. The final test showed that the transmitting peak-to-peak power is above 2watts(33d Bm) with the flatness of ±0.7d B, while the spurious suppression is greater than 40 d Bc.And the gain of the reciving channel is above 30 d B with the flatness of ±1.5d B, while the noise figure is less than 5.6d B. All kinds of performance meet the design requirements.The summary and analysis for problems in this work have been made in the last of the paper, which have some reference value to the research of millimeter wave transceiver.