| 摘要 |
A passive reflective antenna (75) located near an active receiving antenna (71) is used to change the energy at the receiving antenna (71). The change in energy may be such as to remove a null created by multipath or to provide directionality, or both. The receiving antenna (71) is permanently connected to a single receiver (73). When the receiver's output signal degrades below an acceptable level of quality, the reflective phase of the passive antenna's load is changed to change the phase of the reflected energy and achieve a desired effect (remove a null, change directionality, etc.) at the receiving antenna (71). In the simplest embodiment, the termination of the passive antenna (75) is switched from an open circuit to a short circuit, or vice versa, to invert the phase of the reflected energy.
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