The Design And Implementation Of Transceiver Circuit For K-band Communication System

In recent years,wireless communication technology is not only widely used in the military,aerospace,but also into the thousands of households has become a necessity in people's production and daily-life.Accompanied by the increasing demand of bandwidth,the development and utilization of microwave frequency band has become one of the significant developing directions of wireless communication technology.Microwave communication has abundant frequency resources,the advantages of small size and great anti-interference ability.The researched object of this thesis comes from a scientific research subject.This subject designed and realized a K-band communication equipment which contained the transmitting and receiving circuit and adopted the time division duplexing(TDD)mode.Since it is mainly used in ground-to-air communication systems,it also can be used as a reference object for other communication systems.In addition,this thesis has completed the design and implementation of a K-band antenna array.This thesis applies the method of simulation verification and physical test.The main content of this thesis is presented as follows:1.First,this thesis researched and analyzed the common architectures of trans-circuit and re-circuit,comparing their advantages and disadvantages.And introduced regular parameters Then it determined the final architecture of the communication equipment based on the specific index requirements of the system.2.According to the final architecture of transceiver circuit scheme,the transceiver circuit is allocated with specific index.Then selected the chips that conform to the index requirements of each module based on the demands of the physical realizability,the cost and integration.And briefly introduced their main parameters of function.Using the ADS software to carry out the system-level simulation of the transceiver circuit with the specific parameters of each chip device.Finally,it verifies that the design of the transceiver meets the target requirements.3.The forth chapter successively completed the design of each module in the transceiver circuit.Then the transceiver circuit is implemented with the size which is 140mm×140mm,realized the goal of miniaturization of communication equipment.Finally,the trans-circuit and the re-circuit are severally tested and verified.The test results show that the implementation of the trans-circuit and the re-circuit meets the system's index requirements.The design of this communicating equipment can complete the communication tasks.4.According analyzed the directivity function of uniform linear antenna array,array synthesis methods and the design requirements of antenna,the fifth chapter completed the design of the K-band antenna array.The element of the antenna array is in the form of printed dipole antenna and the size of the array is 6×1.Using the HFSS software to design and simulate the antenna array,and the gain is about 9dBi.Finally using the artificial test platform to test antenna in the anechoic chamber,the final test results show that the antenna's width of main lobe is less than 20° and the side-lobe level is about-18 dB.The design of antenna ultimately achieved the demands which are low side-lobe level and miniaturization.