Research On Microwave Millimeter Wave Wideband Power Divider

As one of the important passive components in wireless system,the performance of power divider has great influence on the performance of the whole system.In order to adapt to the rapid development of the wireless communication industry in the military and civil fields,such as radar,navigation,satellite communication,electronic countermeasures,5G and so on,the research of broadband microwave and millimeter wave power divider is particularly important.Based on this,this paper designs two types of broadband power dividers for microwave and millimeter-wave frequency band,which are applicable to the lower frequency band and the higher frequency band respectively.The specific contents are as follows:Firstly,based on the theory of multi-stage Wilkinson power divider,a kind of broadband power divider is designed with the overall working frequency covering 1~20GHz.The power divider is designed with a microstrip transmission line and the area is reduced by bending the line.An eleven-stage Wilkinson power divider was designed to directly cover 1~20GHz wideband.Within the range of 1-18 GHz,the power divider insert loss is lower than 2dB,the isolation is greater than 18 dB,and the return loss of input and output ports is larger than 15 dB.In order to reduce insertion loss and optimize performance,ceramic substrates with low dielectric loss were used to design two power divider operating at 1~8GHz and 8~20GHz respectively,and thin-film resistor was used to replace chip resistor to reduce errors introduced in the assembly process and improve the integration.Secondly,based on the substrate integrated waveguide,a millimeter-wave wideband power divider is designed,operating in the range of 20-40 GHZ.The input is divided into two half-mode substrate integrated waveguide(HMSIW)by slotting in the middle of the upper surface of the substrate integrated waveguide,realized power distribution.The wideband transition between the input and output ports to the adaptor is realized by the slot-line coupling structure in the form of coplanar ground waveguide and the linear gradient structure in the form of microstrip.Two isolation resistances were added above the slot-line to improve the isolation.The test results show that the insertion loss in the working frequency range is about 5dB,the return loss of input and output ports is larger than 7.5dB,and the isolation is better than 10 dB.And on the basis of the two-way broadband power divider,a 20~40GHz eight-way broadband power divider is designed is designed by cascade of seven 2-way power divider.