Has the Apple smartphone "iPhone 4S" solved the blamed antenna problem of the previous generation "iPhone 4"? In order to verify this question, Professor Yukio Hatoyama of the Japanese Takushoku University conducted the test. In the analysis process, it was also found that the CDMA2000-based iPhone 4S added a receive diversity function.
The antenna problem of the "iPhone 4" is that the signal receiving sensitivity is deteriorated when it comes into contact with the lower left side of the casing. We actually tested the receiving sensitivity in 2010, and there is indeed a phenomenon of deterioration.
In 2011, the follow-up model "iPhone 4S" was launched. Compared with the iPhone 4, how does the iPhone 4S improve reception sensitivity, which is a technical topic of great interest to the editorial department.
Good wireless performance
The values ​​of TRP (total radiant power) and TIS (total omnidirectional sensitivity) indicating the wireless characteristics of the mobile phone have obtained good results. The three-dimensional receiving sensitivity was detected while rotating the mobile phone. The more reddish the part, the better the receiving sensitivity.
Therefore, the signal reception sensitivity of the iPhone 4S was tested this time. In conclusion, the iPhone 4S has excellent wireless features, and the signal reception sensitivity is poorly improved when handheld (Figure 1). In addition, the CDMA2000-based iPhone 4S introduces a new technology that can reduce the deterioration of reception sensitivity when handheld.
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