| 摘要 |
A transmit antenna for a surface wave radar system, including a linear array of active monopole antenna elements for transmitting signals in respective frequency ranges. The relative spacings and the relative heights of successi ve elements along the array have logarithmic relationships. The transmit antenn a includes impedance matching circuits for the active monopole antenna element s, and switches for selecting one of the active antenna elements to transmit a signal in a corresponding frequency range while grounding the remaining acti ve antenna elements.
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