An antenna was not found inside, but a balloon with freon was there.

里面并未找到天线，而是一个装有氟利昂的气球在那里。

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Its compact design hides the antenna inside the handset, and the glowing orange keys and display look sharp.

小巧的外形设计把天线置于听筒内，色彩鲜明的橙色按键和显示器看起来非常时髦。

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Other manufacturers generally keep the antenna inside with other components, even though that means their phones are bigger.

其它制造商普遍把天线与其它部件一起放置在手机内部，即便那意味着它们的手机体积要更大。

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The first version had a back made of metal, which hampered the ability of wireless signals to penetrate to the antenna inside, engineers said.

WSJ: Apple Knew of iPhone Antenna Risks

Once you house an antenna structure inside of an aluminum body, you also have shadowing effects to overcome, this is caused by the metal body affecting the radiated signal, as well as the inbound signals from the cell sites.

FORBES: All-Aluminum iPhone In The Works?

What we found is that the computer companies who hired or brought in antenna experts had products which performed better than those who thought that you could just build an antenna and put it inside a notebook.

FORBES: The iPhone 4 Antenna Unravelled