而当超高频广播出现时，每个频道基于同样的理由，也加上了空闲的“保护频带”。

When UHF broadcasting came along, empty “guard bands” were added to each channel for the same reason.

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而当超高频广播出现时，每个频道基于同样的理由，也加上了空闲的“保护频带”。

When UHF broadcasting came along, empty "guard bands" were added to each channel for the same reason.

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针对超高频机载合成孔径雷达天线小型化、高增益和宽频带的问题，分析了短背射天线缩小背腔的增益损失。

To meet the requirements of miniaturization, high gain and wideband of UHF antenna for aircraft SAR, the gain loss produced by narrowing back cavity of short back radiation antenna is analyzed.

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