ANALYSIS AND DEVELOPMENT OF A SIGNAL INJECTION TECHNIQUE USING TRANSMISSION-LINES EMBEDDED AT PHASED-ARRAY APERTURE

In a performance monitoring/fault isolation and correction (PM/FIC) sy stem of a phased array antenna, a built-in transmission line embedded in the array aperture is used for signal injection to check the signal flow. In this paper we present an analysis of electromagnetic couplin g between a twin-lead transmission line and a dipole element. An analy sis of the coupling between a transmission line and a linear array of dipole elements over a ground plane has also been developed. The calcu lated data compared with the measured data favorably. A development of microstrip-line signal injectors embedded in an aperture of a 2-D arr ay of monopole excited parallel-plate waveguides has also been made. M easurements of the feed and aperture distributions have been made and the measured distributions follow the designed feed distribution close ly.