Research On S-band Transceiver Module

In today's society,wireless communication technologies are rapidly developing and changing with each passing day.Civilian wireless communication represented by mobile communication technology and military communication technology represented by radar,data link,aviation,and aerospace promote the vigorous promotion of civil and military industries in the country.Therefore,wireless communication technology will be used in daily life and international disputes in the future.It still occupies a pivotal position.In view of the above situation,this thesis has developed a S-band transceiver component,which can be divided into three parts according to the requirements of specific indicators:Firstly,the transmitter module is designed.According to the requirements of design specifications,it is determined that the transmitter circuit is cascaded by three-stage power amplifiers,and the GaN power amplifiers that meet the requirements are selected.The final stage circuit is determined by using the CGH40025 type power amplifier tube;the secondary circuit is determined.Choosing the CGH40010 type power amplifier tube of CREE company;Drive level circuit chooses RFMD company SBB5089 Z type power amplifier tube,design the peripheral circuit of each level power amplifier through the simulation software,have determined the feasibility of the power amplifier tube chosen.Increase the power detection circuit in the transmitter module to achieve the remote measurement of output power.Secondly,the receiver module is designed,and the low noise in the receiver module mainly considers the gain and noise coefficient in the selection process,and then measures other performance indicators.According to the design index requirements,the receiving circuit is finally determined to adopt two levels.AVAGO company MGA638-P8 model low noise emission cascade design.The isolation of the transceiver module uses a double-junction circulator to protect the transmission circuit and improve the stability of the module.Finally,the control module is designed to meet the requirements of the voltage,current,and power sequence of each power amplifier tube,and the transistor logic level is used to control the high-level transmission and low-level reception of the transceiver components.The layout of radio frequency circuits and control circuits,as well as the cavity of the transceiver components,are mapped and manufactured.The assembled transceiver components are debugged and tested.After testing,the control module meets the requirements for the voltage,current,and power-up sequence of each power amplifier tube.The transistor logic level can realize high-level transmission and low-level transmission and reception of transceivers.Level receiving control function.Transmitter module in the3.2GHz-3.4GHz frequency range,when the input power is 0dBm,the output power is not less than 40 dBm,the output flatness is 0.75 dB,the third-order cross-modulation is lower than-16 dBc,and the spur suppression is lower than-60 dBc.The receiving module has an output power of not less than 10 dBm in the frequency range of 3.2GHz-3.4GHz,an output flatness of 1.05 dB,a noise figure of less than 3dB,a gain of not less than 15 dB,and a third-order cross-modulation of less than-65 dBc.