Research And Design Of Several Power Dividers With Specific Functions Based On LTCC Technology

With the rapid development of artificial intelligence and the fifth generation mobile communication being about to be commercialized,the requirements on the performance of related products are getting higher and higher.The development of semiconductor technology has promoted the performance of active devices in miniaturization,high performance,etc.And in the field of passive devices,the technologies such as Low Temperature Co-fired Ceramics(LTCC)have also developed to some extent,but there are still many problems in how to make passive devices smaller and get better performance.The power divider is an indispensable device in the field of radio frequency,and it is the focus of current research in related fields that how to improve the miniaturization of power dividers and meanwhile ensure the good performance of power dividers.This thesis based on LTCC technology systematically demonstrates the advantages of lumped components in miniaturization of devices,verifies the feasibility of the designing power divider that is made of stripline and realized by LTCC technology,verifies the feasibility of combining power dividers with different types of devices to achieve comprehensive performance.The main work is as follows:1.The design theory of the Wilkinson power divider is discussed in detail,and the lumped inductance and lumped capacitance are analyzed theoretically.The above theory is the foundation of the following three power dividers that being designed.A binary unequal power divider is designed by the theory of unequal power dividers,a three-way equal power divider is designed by the theory of multi-channel power dividers and a four-way equal broadband power divider is designed by the theory of multistage power dividers and multi-channel power dividers.2.The technology of combining a bandpass filter with a power divider is studied.After discussing the theoretical basis of bandpass filter and the knowledge of lumped elements combined with transmission line theory,a semi-lumped filter with high suppression is designed in which transmission zeroes is applied through cross-coupling theory.Based on the theory of the Wilkinson power divider,a lumped binary equal power divider is designed.Combining the bandpass filter with the power divider,a power divider with excellent filtering performance is designed.3.The principle and property of infinite short transmission line are discussed in detail.Even-Odd mode analysis is used to study the principle of the power divider with two-stage and the conclusion that the change of center frequency has no effect on isolation resistance is obtained.The property of short-circuit branch is analyzed,and it can be used to optimize power dividers' performance because of its character.Finally,an ultra-wideband power divider with the center frequency of 10 GHz is designed.4.The technology of combining a balun,a phase shifter and a power divider is studied.By matrix analysis,the principle of the Marchand balun is introduced in detail,and a deformed Balun is designed based on the theory of Marchand balun.The principle of the loading doublebranch phase shifter is discussed in detail and based on the theory,a 90° phase shifter is designed.Combining the balun,the power divider and the 90° phase shifter,a power divider whose output signals have different phase is designed.The power divider's center frequency is 3 GHz and the bandwidth is 600 MHz.