Patent ID: 6853329
Filing Date: 2005-02-08
Classification: G01S,H01Q

Abstract:
1. A monopulse radar system to detect an azimuth depending upon amplitude difference or phase difference between signals respectively received by a plurality of receiving antennas, the monopulse radar system comprising: a transmitting array antenna including a plurality of antenna elements forming an antenna train; a receiving array antenna including a plurality of antenna elements forming an antenna train, the receiving array antenna being used for one of a plurality of receiving antennas; at least one antenna switch disposed among the plurality of antenna elements of at least one of the transmitting array antenna and the receiving array antenna; and a switch controller for turning ON/OFF said antenna switch to selectively activate said antenna elements so as to change an aperture length of at least one of the transmitting array antenna and the receiving array antenna thereby changing a beam shape of said at least one of the transmitting array antenna and the receiving array antenna, wherein said plurality of antenna elements of the transmitting array antenna and the receiving array antenna are formed on a dielectric substrate, and wherein a dielectric length between the antenna train formed by the plurality of antenna elements and the antenna switch included in at least one of the transmitting array antenna and the receiving array antenna is ½ dielectric wavelength.