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4G antenna design is facing challenges
Jun 22, 2017

There are many elements that affect the 4G antenna functionality of handheld mobile devices. Although these elements are relevant, they are generally able to divide the three categories: antenna scale, mutual coupling between multiple antennas, and equipment utilization models.

Antenna Scale The antenna scale depends on three elements: job bandwidth, operating frequency, and radiated power. Today's bandwidth request is getting higher and higher, the driving force from the US FCC frequency distribution and global operators around the travel agreement; not the same as the use of different areas of the band. 'The bandwidth and antenna scale are directly related' and 'the power and the antenna scale are directly related to' - which generally means that larger scale antennas can provide greater bandwidth and higher power.

In addition to bandwidth, the antenna scale also depends on the operating frequency. In the North American region, carriers Verizon Wireless and AT & T Mobility selected LTE commercial operations in the 700MHz band, which was part of the FCC UHF-TV redistribution band a few years ago. These new bands (17, 704-746 MHz and 13,746-786 MHz) are lower than the traditional cellular bands (5,824-894 MHz) used in North America. This change is infinite, because the lower the frequency, the longer the wavelength, and thus require longer antenna to adhere to the same radiation power. In order to ensure the radiated power, the antenna scale needs to be large. However, the equipment planner also needs to add a larger display and more functionality, so the available antenna length and total volume are severely constrained, and then reduce the antenna bandwidth and power.

Antenna mutual coupling between the high-speed wireless protocol requests the use of MIMO (multi-input multiple) 4G antenna. MIMO requests multiple antennas (usually two) to work together at the same frequency. Thus, the telephone equipment needs to place multiple antennas, which operate together and can not be affected each other. When two or more antenna directions are close together, a scene called mutual coupling occurs