Design And Research Of Passive Components Based On LTCC Technology

LTCC(Low Temperature Co-fired Ceramic)is a mainstream technology to achieve passive components and modularity.LTCC technology has the advantages of high temperature resistance,small dielectric loss of the material,multiple selectivity of the dielectric constant of the material,and the three-dimensional structure is favorable for the layout of the device.Electronic products implemented with LTCC technology are widely used,such as in base stations,mobile phones and other communication equipment,the utilization rate accounts for a large proportion.LTCC products determine the size,performance and cost of communication equipment to a certain extent.With the advent of the 5G era,passive devices such as filters,duplexers,and antennas have ushered in a new round of peak usage,making LTCC technology increasingly valued by the industry.With the escalation of the trade war and blockade of core technologies abroad,the localization of electronic components is unstoppable.This paper introduces the technical characteristics and technological process of LTCC.With the goal of achieving“independent and controllable,domestic substitution” of passive devices of LTCC technology,and designs several microwave passive components based on the actual project.Includes of designs and simulates the antenna,balun,power distributor and band-pass filter,processing verification was performed on some of the designed passive components,and samples were tested.The main work is as follows:1.With reference to the LTCC antenna(model:1575AT43A0040)of American JOHANSON TECHNOLOGY Company,a LTCC antenna with a center frequency of1.5757 GHz,a bandwidth of 40 MHz,and a size of 2mm*7mm*0.8mm can be used in GPS systems.During the design process,the microstrip and coplanar waveguides were used to simulate and optimize the LTCC antenna.The network antenna was used to test and verify the processed antenna,the test results match the design results.2.Reseached and designed two LTCC baluns,the structure of which is Marchand four-line baluns,and the size of baluns is 2.0mm*1.2mm*0.95 mm.First,with reference to the performance index of American mini-circuits company balun(model:NCS2-62+),a balun with a center frequency of 490 MHz and a frequency range of390MHz～490MHz is designed and simulated,which can be used in the VHF/UHF frequency band.Another center frequency is 5.5GHz,and the frequency range is3.0GHz～8.0GHz,which can be used in the ISM band.The balun with a center frequency of 5.5GHz has been processed and tested,and the test results are qualified,which can completely replace the balun of mini-circuits(model: NCS2-83).3.With reference to the specifications of the band-pass filter in the same frequency band abroad,research and design an LC band-pass filter with a size of2.0mm*1.2mm*0.95 mm,a center frequency of 3.6GHz～3.9GHz.This thesis mainly performs 3D modeling and optimization simulation of HFSS for the band-pass filter.The simulation results are comparable to the filter performance indicators of foreign manufacturers(JOHANSON TECHNOLOGY、TDK company).4.A LTCC power divider with a size of 3.2mm*1.6mm*0.9mm,a center frequency of 3.25 GHz,and a frequency range of 2.8GHz～3.7GHz was studied and designed.After the simulation optimization was completed,the power divider was processed and tested.The test results basically meet the requirements.