What is not in dispute: the iPhone 4 antenna has a weak spot in the lower-left corner of the frame, marked by the black line in the frame.
毫无争议的是：iPhone 4 的天线在金属框的左下角有一个弱点，就在框上的黑线处。
2
With the iPhone 4, Apple changed the design of its antenna, embedding it in the steel-frame chassis.
新的iPhone 4中，苹果改变了其天线的设置，将其嵌在了有钢制框架的底座中。
3
An antenna was developed to radiate high power, sub nanosecond EM pulse, which consists of a high power wideband mode convertor, a wire frame TEM horn feedback set and a parabolic reflector.