Why did the phone antenna disappear

In general, the length of mobile phone antennas is 1/4~1/2 of the wavelength. With the development of modulation technology, the frequency band continues to increase and the wavelength becomes shorter. Mobile phones no longer need bulky external antennas, and antennas are becoming smaller and implanted inside the phone. Moreover, as mobile phones support more and more wireless communication frequency bands and functions, the required antennas are becoming increasingly complex.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.

Have you noticed that in the past, mobile phones had very long antennas, and early phones also had protruding small antennas? Why don't our phones have antennas now? With the evolution of 1G, 2G, 3G, and 4G, the communication frequency of our mobile phones is gradually moving towards the high frequency range. The higher the frequency band of mobile communication, the shorter the wavelength and the shorter the antenna. After the antenna became shorter, it gradually shifted from the previously popular external antenna to the now common internal antenna. The antennas are all hidden inside the phone, and there are more than one. In addition to the main communication chip used to access the operator's network, mobile phones also have Wi Fi function, Bluetooth function, GPS function, and NFC function, all of which require different antennas. Even the increasingly popular wireless charging now uses a charging coil that is also a type of antenna.