Research On Some Key Technologies Of 4.5GHZ Front-end

MIMO polarization diversity + multi beam selection technology based on(MIMO)system has stable performance,easy to deploy and moderate complexity and other significant advantages,therefore,has become the preferred solution to achieve reliable coverage at present many omnidirectional wireless communication system.Unlike the 2GHz MIMO 4.5GHz MIMO system,frequency doubling,design of microwave components and technology to form a new challenge;on the other hand,nonlinear and dispersion characteristics of high frequency RF circuit of inherent and the amplitude phase consistency,the higher requirements of isolation and its phase lock loop near end noise the design technique is proposed.These challenges and requirements have become a major obstacle to the miniaturization and high performance of 4.5GHz MIMO RF front-end.Therefore,this thesis focuses on the above three key technical problems systematically,and focuses on the design,implementation and verification of the problem.The test results show that the solution presented in this paper is feasible and effective.It has important theoretical significance and practical engineering value for solving the technical problems faced by 4.5GHz MIMO front-end.