Investigations On Substrate Integrated Millimeter Wave High-speed Electronic Interconnects

The coming of the big data era and the development of the fifth generation mobile communication bring about widespread and urgent need for high-speed data transmission.The high-speed data transmission and the improvement of integrated circuits are closely related.With the reduction of the feature size of circuits,interconnects play an increasingly vital role in the performance of circuits.The development trends of high density,high speed and miniaturization of integrated circuits have put forward higher requirement on interconnects performance.The traditional integrated interconnects like microstrip lines and striplines,face the problem of crosstalk because of their open-structure.The discrete components,such as rectangular waveguides and circular waveguides,are difficult to be integrated in circuits because of the volume.Optical interconnects show advantages in long-distance transmission,but the cost is high when used in the transmission between chips,and cannot be integrated in circuits easily.The substrate integrated millimeter wave interconnects,such as substrate integrated waveguide?SIW?and substrate integrated coaxial line?SICL?,have the advantages of broadband,low cost,low loss,easy integration,and anti-crosstalk,hence can provide good physical channel for high-speed data transmission.In this dissertation,substrate integrated millimeter wave interconnects are used for high-speed data transmission,and the theoretical analysis and experimental verification are given.The main work and innovation points could be summarized as follows:?1?A high-speed data transmission system is proposed.A half-mode substrate integrated waveguide?HMSIW?is used as the physical channel of the system,and quadrature phase shift keying?QPSK?scheme is used to transmit two independent signals.Accurate mathematic modeling of the system is proposed,and then the transmission model of the system is obtained.After that,the amplitude and phase of the output signals are deduced,and the crosstalk between the channels are analyzed.Finally,the amplitude and phase compensation methods are obtained.The experimental results with/without compensation have verified that using the compensation can significantly improve the signal integrity of the system and suppress the crosstalk between the channels.In the experiment,a 15 Gb/s data transmission rate is realized.?2?An SICL with quasi-coaxial transitions is proposed.The dominant mode of an SICL is TEM?Transverse electromagnetic?mode and the baseband signal can be transmitted directly.Broadband impedance matching and good signal integrity are realized for the SICL.The measured 3dB bandwidth of the proposed SICL is DC?direct current?⁶7GHz,and the data transmission rate is 30 Gb/s with BER?bit error rate?less than 10^-12.Besides,co-design of the SICL and BGA?Ball grid array?is made.?3?A multichannel SICL array with transitions and its design procedure are proposed.The SICL array can expand the number of channels arbitrarily in the horizontal and vertical directions,so multichannel parallel data transmission can be realized.Moreover,meatal fences are introduced to improve the isolation between adjacent channels,and then the crosstalk is decreased by about 23 dB.Besides,the arrayed quasi-coaxial transitions are also designed to make the SICL array measurable and usable.A design procedure of the proposed SICL array with quasi-coaxial transition is proposed.According to the procedure,a 15×3-channel SICL array is designed and fabricated using LTCC?Low temperature co-fired ceramic?process.The fabricated SICL array can realize an aggregate data transmission rate of 1.35 Tb/s,and the crosstalk between adjacent channels are less than-30 dB.