Waveguide Crack Array Antenna Analysis And Design

Slotted waveguide array antenna has been used widely in radar and microwave communication systems because of their flat, compact structure, power capacity, realizing low side-lobe and very low side-lobe. In this article, the radiating surface and power divider are researched in this paper.First, review the research history and present situation of the slotted waveguide array antenna, introduce the structure and keystone; analysis the impedance characteristic and resonance length of the slot, conclude the Dyadic Green's functions of the longitudinal, horizontal and inclined slot in the waveguide using the boundary condition of the magnetic field. Then, theory analysis and calculation of the rectangular waveguide longitudinal slot arrays are made by using moment method, including the inner and outer mutual couplings, the effect of the finite waveguide wall thickness and the internal higher order mode coupling. Show the elementary expression in the admittance matrix, solve the singularity problem, present the array of linking far-radiation field. As well as on the single slot, a standing wave linear array and a linear array for the program, to verify the correctness of the methodology and formulas derived; Design a line array by taylor distribution. Analysis of the array antenna feeding by coupling inclined slot using moment method has been made, get a very important conclusion, using this and taylor method an effective design method is bringed forward, a line array has been designed. Finally, the simulation analysis of two kinds of feed-in power divided systems has been made, design a microtrip power divider and a folding double-T joints.