| Millimeter wave front-end communication system occupies a pivotal position in the wirelessnetwork today. With the extensive use of high-definition television, such as HD set top boxes,Blu-ray DVD players, massive data exchange between personal handheld devices to PC andwireless display applications，these all challenge the wireless high-speed transmission，which farexceed the current transmittability provided by wireless communication systems. Therefore, it isnecessity to use a new wireless communication technology to solve the problem. Theseapplications mainly provide wireless transmission whose transmission rates up to several gigabitsper second or even tens of gigabits per second within2~20meters.60GHz millimeter-wavetechnology provides an effective means for such high-speed transmission. This paper is to studythe research and application of the millimeter wave front-end integration technology of60GHzcommunications.According to the feature and application of the millimeter wave, the essay briefly introducesthe physical characteristics of millimeter wave band, the application and its merits and demerits invarious fields. Then, with the development status and the relevant application research ofdomestic and overseas in front-end communication, the essay introduces the advantages ofmillimeter waves applied in several fields like communication, military, medical science,automotive electronics and its broad application prospects and development direction.Combined with the theory of transmission line and microstrip line, the paper introduces theworking principle and design ideas of microstrip band-pass filter, and designs the zigzagband-pass filter on the basis of the traditional parallel-coupled band-pass filter, which optimizesthe size and performance of band-pass filter. The paper also introduces the design and simulationof microstrip-waveguide probe transition structure and microstrip array antenna. In addition,based on theories of active components, frequency multiplier, mixer, LNA are selected.We design and implement Frequency-Multiplier-by-eight source based on above keytechniques. Millimeter wave Frequency-Multiplier-by-eight source requires to realize the functionof eight times frequency signal and transport signal through the microstrip-waveguide transitionstructure. Combined with own conditions and the laboratory conditions, putting the7.25~8GHzsignal to millimeter wave band, with the form of hybrid integrated circuit. The millimeter waveFrequency-Multiplier-by-eight source is mainly composed of quadruple chips,30GHz frequenciesband-pass filter, doubler chips,60GHz frequencies band-pass filter, microstrip-waveguidetransition structure. This topic will take the design and test for the front-end subsystem of the60GHz millimeterwave transceiver as the main work of the essay. Millimeter wave front-end communication systemis asked to complete the transceiver communication, up-conversion frequency, down-conversionfrequency, amplify signal with low noise and other functions. Transceiver subsystem is mainlycomposed of quadruple circuit, filter, harmonic mixer, low noise amplifier and microstrip antennaarray. Receiver front-end subsystem and transmitter front-end subsystem adopt the way ofharmonic mixer. Receiver front-end subsystem down-converse RF signal and fourfold-frequencyLO signal to generate IF signal. Transmitter front-end subsystem up-converse the unmodulated IFsignal and fourfold-frequency LO signal to generate RF signal.The essay analyses millimeter wave front-end subsystem and Frequency-Multiplier-by-eightsource in detail. According to the scheme, the essay analyses the target of each part of the systemwith the software simulation. Next, it analyzes the theories, target, designs and performancequalifications of various kinds of active and passive circuits of Frequency-Multiplier-by-eightsource and the millimeter wave front-end subsystem. After finishing the simulation, the essaydesigns the layout of the millimeter wave front-end subsystem and Frequency-Multiplier-by-eightsource with mechanical structures around it. The system function becomes true by assembled. Thelast is measuring the circuit system and analyzing the data. The conclusion is that the outputpower of the Frequency-Multiplier-by-eight source conforms to the expect target and themillimeter wave front-end subsystem reaches the function of receiver and transmittercommunication and up-down conversion.In summary, this paper completed the circuit design of the Frequency-Multiplier-by-eightsource and the millimeter wave front-end transceiver subsystem, and achieved the desired goal.However, there are also some problems and shortcomings. In the end, the essay not only makesupplements and comprehensive analysis for these shortcomings, but also put forward someimprovement measures. These will be the direction of future work. |
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