| 摘要 |
PURPOSE:To realize the constitution of two antennas with a single radiation conductor and to obtain a compact radio equipment, by using the short-circuit plates to secure connection between two areas of the end face part of the radiation conductor and an earth conductor. CONSTITUTION:When an antenna switch signal S1 is set at a high level, a short-circuit plate 42 is separated from an earth conductor 2 and only a short- circuit plate 41 is connected to the conductor 2. Thus the potential of an antenna 1 is set at zero at the side of the plate 41 and also opened at the other end side when the antenna 1 is used for transmission. Therefore, the reflection is produced in terms of a high frequency and the standing wave is produced for radiation of radio waves. At the same time, the field component is limited to the linear polarized wave in the X axis direction only for the radio waves projected vertically to the conductor 2. While only the plate 42 is connected to the conductor 2 and the linear polarized wave is produced in the Y axis direction in case the signal S1 is set at a low level.
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