| 摘要 |
A reflector circuit (1, 100, 200, 300) is provided which responds to illuminating radiation (4) with corresponding output radiation (6) of increased magnitude relative to the illuminating radiation (4), whilst also providing a frequency selective limiting characteristic. The circuit (1, 100, 200, 300) comprises an antenna (2) for receiving the illuminating radiation (4) and emitting the corresponding output radiation (6), a delay line (8) providing a frequency selective limiting and signal storage characteristic and an amplifier assembly (10; 10, 106, 108, 226, 228). The antenna (2) provides an input signal upon receipt of the illuminating radiation (4), a portion of which is amplified, frequency selectively filtered and then stored for a period after which it is emitted as the output radiation (6) from the circuit (1, 100, 200, 300). Switches (230, 302, 304) are incorporated and are operable to counteract spontaneous oscillation within the circuit (100, 200, 300).
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