Comprehensive Research And Application Of Arbitrary Phase Difference And Adjustable Bandwidth Jumpers

Crossover is a frequently used component in microwave monolithic integrated circuits(MMIC),which allows two signal channels to cross each other with excellent transmission performance and good isolation.Conventionally,crossovers were realized by non-planar components which have several inherent drawbacks.For this reason,planar crossovers have aroused research interest in recent years.The opened literatures of planar crossover can be classified mainly into two types,one is wideband crossover,the other is dual-band crossover.In this paper,the admittance matrix method and coupling matrix synthesis method are used to design the arbitrary phase delay crossover and the controllable-bandwidth filtering crossover respectively,major works are introduced as followed:(1)The admittance matrix method is applied in the design of arbitrary phase delay crossover with specific analysis steps.A cross-ring four-port network is designed to be an arbitrary phase delay crossover with compact and multi-solution characteristic based on admittance matrix method,each parameter of this structure can be calculated directly by deduced formulas.To verify the theorem,two 45° crossovers are designed.The simulated and measured results are agreed well and accord with performance index,which validates the feasibility of desiging method.(2)Applying the admittance matrix method in the design of dual-band arbitrary phase delay crossover theoretically.The cross-ring four-port network is added opened or short stubs to achieve dual-band performance.The detailed procedure and deduced formulas for each parameter are presented.(3)A novel substrate integrated waveguide(SIW)is firstly proposed on the basis of the orthogonal degenerated TE201 and TE102 modes in SIW square cavities.By properly choosing the position of the feeding ports and coupling windows,excellent transmission response and good isolation performance could be achieved.In addition,thanks to the filtering characteristic,the bandwidth of the crossover can be easily controlled by using the synthesis method of coupling matrix,and the maximum bandwidth will be determined by acceptable isolation levels.A three-order SIW crossover prototype in 1.4%FBW is designed,and the measured results are in satisfactory agreement with the simulations.Therefore,the designing concept is experimentally feasible.