| 摘要 |
PURPOSE:To make the frequency band width broader, by arranging a sectorial parasitic element around an elliptic microstrip antenna. CONSTITUTION:An elliptic radiation conductor element 3 is provided on the upper side of a dielectric 2 and a ground conductor plate 1 is provided on the rear side. Further, two feeding points 7, 8 are provided on a major and a minor axis of the elliptic radiation conductor element 3. Plural sectorial parasitic elements 11, 11', 12, 12' are arranged around the conductor element 3 in a two-frequency common use type microstrip antenna constituted in this way. Thus, the frequency band width of coaxial feeding wires 9, 10 connected to the feeding points 7, 8 is increased as much as about >=3 times in comparison with the case not using the parasitic elements. Further, the coupling attenuation between the coaxial feeding wires is ensured for >=30dB. |
