Design of microstrip-input taper-structures for required beam shape in rotman-lens phase shifter

摘要

Rotman-lens is widely used in multi-beam antennas for beam forming networks which give required beam directions. Discrete beam-scanning can be fulfilled by switching beams. However, a part of the radiated power from the input port to the Rotman-lens which delivers outside of the output port arrangement becomes loss to the dummy ports. Therefore, optimizing the connection angle and the tapered width of the input port, the transmission efficiency is expected to be improved. The structure of the input port arrangement is optimized in this work. The effect for the efficiency improvement is demonstrated in this paper.