The Research Of Multi-band Wilkinon Power Divider Based On Planar Transmission Line

With the arrival of the 5G era,a miniaturized power divider that closely integrates with the mobile communication system 2G/3G/4G/5G multi-mode coexistence has become a research hotspot.The traditional Wilkinson power divider is difficult to meet the requirements of miniaturization,and the working band is single.Besides,the traditional Wilkinson power divider can't realize multi-mode coexistence.To solve this problem,this paper proposes miniature and multi-band novel Wilkinson power divider which based on planar transmission lines.The main contents of the specific work are as follows:(1)Firstly,the paper describes the development of dual-band and tri-band power divider,and the problems which exist in current power dividers.Then the basic theory,performance indicators and the even-odd mode analysis of Wilkinson power dividers are introduced.Finally,the impedance matching network of the power divider and several commonly used planar transmission lines are briefly described and summarized.Based on this,the method of designing multi-band power divider using novel planar transmission lines is proposed.(2)The design idea of miniature dual-band Wilkinson power divider is proposed.The power divider adopts a new planar transmission line to replace the ?/4 impedance converter in Wilkinson power divider.The new planar transmission line is composed of coplanar waveguide transmission line and microstrip transmission line in series through via holes.Firstly,the parameters of the planar transmission line in the power divider are derived through the even-odd mode analysis and the theory of the transmission line.The dual-band Wilkinson power divider is realized,and the working band are respectively 0.80GHz-1.0GHz and 2.80GHz-3.0GHz.Then,the miniaturization of the power divider is realized by using spiral structure.Finally,the miniature dual-band Wilkinson power divider is processed into a real board.The circuit area is approximately 0.000791?02.And the measured S parameters of fabricated Wilkinson power divider are basically consistent with the simulated one.The testing results show that the return coefficients within the dual band are both less than-15dB,isolation are both less than-20dB,wherea the insertion loss are both approximately-3.10dB.Therefore,the correctness of the theory and the feasibility of the design are verified.(3)The triple section step-impedance resonator is used to realize the tri-band Wilkinson power divider.The working band of the power divider are respectively 2.15GHz-2.75GHz?3.98GHz-4.81GHz?5.90GHz-6.32GH.Firstly,the Wilkinson power divider adopts triple section step-impedance resonator to realize the tri-band Wilkinson power divider.The tri-band Wilkinson power divider is realized out-of-band suppression by introducing an open stub.Then,the spiral structure makes the circuit of the tri-band Wilkinson power divider more compact.The miniaturization of the power divider is realized.Finally,the tri-band Wilkinson power divider is processed into a real board and the circuit board is tested.The circuit area is 0.033 ?02·The measured S parameters of the tri-band Wilkinson power divider are in a good agreement with simulated one.The testing results show that the return coefficeints within the triple band are both less than-15dB,the isolation are both less than-15dB,wherea the insertion loss are both approximately-3.20dB.Therefore,the correctness of the theory and the feasibility of the design are verified.