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Post time 2008-2-18 19:32:43 |Display all floors
ADAPTIVE ANTENNAS: can form a beam and direct it to a target, greatly reducing the attenuation of power, a serious problem in the 60-GHz band, which is strongly absorbed by air. In a conventional antenna [left], the received power declines with the square of the distance. Adaptive antennas [right] use an array of emitters with delayed phases that make the waves’ peaks and troughs add constructively [insert]. This trick focuses the power into a beam, which can then be steered up (a) or down (b) electronically. Advances in 60-GHz transceiver design now make it possible to fit an adaptive array on a single chip.
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Post time 2008-2-18 23:32:26 |Display all floors
通过移动相位达到正相加效应

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Post time 2008-2-19 06:24:04 |Display all floors
请问:
make the waves’ peaks and troughs add constructively的字面意思是什么呢?

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Post time 2008-2-19 06:46:31 |Display all floors
with delayed phases that make the waves’ peaks and troughs add constructively

通过相位后移,使电波的峰、谷部分分别相加(而不是因为相位错开而局部抵消)。

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Post time 2008-2-19 06:56:26 |Display all floors
Adaptive antennas [right] use an array of emitters [with delayed phases] that make the waves’ peaks and troughs add constructively.
我觉得是with delayed phases是作emitters的后置定语,后面的that定语从句同样修饰 an array of emitters 。

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Post time 2008-2-19 07:49:48 |Display all floors
Originally posted by clearwater at 2008-2-18 05:56 PM
我觉得是with delayed phases是作emitters的后置定语,后面的that定语从句同样修饰 an array of emitters 。

没错。Emitters with delayed phases 发出来的电波也同样是 with delayed phases。

当然,也可以这样说:以相位后移的发射器(?),使(发出的)电波的峰、谷部分分别相加(而不是因为相位错开而局部抵消)。

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Post time 2008-2-19 07:53:14 |Display all floors
多谢JL!

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