| 摘要 |
A patch antenna is provided with two feed points, one on either side of a cut-out. Both feed points are connected to the ports on a first side of a matrix switch, one directly and one via a capacitor. An antenna feed is connected to one of the ports on a second side of the matrix switch, while the other is earthed. In use, a controller operates the switch so that the antenna feed is connected one or other of the feed points, each giving rise to a different resonant frequency and so providing a way of tuning the antenna for small frequency shifts.
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