4POZAR D M.Microstrip antenna aperture-coupled to a mi-crostrip line[J].Electron Letters,1985,24(12):49-50.
5POZAR D M.TARGONSKI S D.Improved coupling for microstrip aperture coupled microstrip antenna[J].Elec-tron Letters,1991,27(13):1129-1131.
6YANG Xian-hua.Characteristics of aperture coupled microstrip antennas with various radiating patches and coupling apertures[J].IEEE Trans.on Antennas and Propagation,1995,43(1):72-78.
7LIU Zhang-Fa,KOOI Pang-Shyan.A method for designing broad-band microstrip antennas in multilayered planar struc-tures[J].IEEE Trans.on Antennas and Propagation,1999,47(9):1416-1420.