Analysis and Design of Wideband Rotman Lens with Exponential Taper Using Contour Integral and Segmentation Method

경계적분법과 세그멘테이션 기법을 이용한 광대역 지수함수 테이퍼 로트만렌즈의 해석 및 설계

This paper has been studied analysis and design of microstrip Rotman lens operating over wide band and wide steering angle by the contour integral method along with the segmentation method. All mutual coupling, internal reflections between ports with exponential taper are taken into account. Equally spaced ports are designed and realized which gives less amplitude ripple at array ports. The measured results of 12 input and 12 output lens show $\pm$1.8 dB insertion loss deviation over 6~18GHz wide frequency range and beam steering accuracy less than 1$^{\circ}$ over $\pm$53$^{\circ}$ angle and agrees well with the analysis results.