| 摘要 |
PURPOSE:To realize the low posture, a high gain and a wide band each by providing the microslot or the slender microcapacity bar extending to the radius direction on the fringe of the circular radiation element. CONSTITUTION:The microslot (dielectric load impedance) or slender microcapacity bar 7 (capacitive load impedance) extending to the radius direction is provided on the fringe of circular radiation element 1. As a result, the antenna is resonated by the two different frequencies which are separated into the upper and lower parts of the basic resonance frequency decided by the radius of the disk. Thus the 2-point resonance frequencies can be resonated to the transmission and reception bands each in the case of the communication system in which both the transmission band and the reception band are required separately by selecting properly both the measurements and the loading position of load impedance 7 or 8. |
