The iPhone 8X with its full-screen design has captured the attention of many consumers. Unlike previous models, this device features a more immersive display that gives it an almost artistic appearance. When the iPhone 6 was released, it created a massive rush among buyers, with three out of five Americans considering switching to Apple. Now, the iPhone 8X is following in those footsteps, drawing significant interest and anticipation.
According to reports, Apple plans to sell nearly 200 million units of the 8X in 2018, signaling a major shift in the company’s strategy toward full-screen technology. While the benefits of a full screen are obvious—such as a larger display area and a more modern look—there are also challenges, particularly when it comes to antenna design.
Traditional antennas are typically placed at the top and bottom of the phone, but the full-screen design encroaches on that space. Antennas require a clear area free from metal to function properly. However, the full screen acts like a metal layer, and the electromagnetic radiation from the display can interfere with the antenna’s performance, reducing signal strength and increasing noise.
To address these issues, several strategies have been implemented:
1. **Increased Transmission Power**: Boosting the power output helps compensate for signal loss caused by interference.
2. **Splitting the Antenna**: The antenna is divided into two parts—one captures the signal through the exposed frame, while the other handles impedance matching, moving away from the metal layers to reduce interference.
3. **Screen Interference Reduction**: Applying magnetic and metal double-layer materials to the OLED screen can help minimize electromagnetic radiation.
4. **Low-Loss Antenna Substrate**: Traditional FPC PI substrates have about 2% electromagnetic loss, which leads to a 3dB drop in signal at 2.4GHz. To solve this, Apple uses LCP (Liquid Crystal Polymer) material, which has much lower loss.
By using LCP, the iPhone 8X not only reduces antenna loss but also replaces multiple coaxial cables with a single, ultra-thin structure. This design allows for low-loss transmission lines, improving overall signal quality.
LCP material can be molded and used with the LDS (Laser Direct Structuring) process to create complex antenna structures. The result is a more efficient, compact, and reliable RF system.
In summary, the full-screen design of the iPhone 8X doesn’t compromise on RF performance—it achieves this through smart material selection and advanced engineering. It also hints at future technologies that will be crucial for 5G connectivity, such as RF antenna substrates and high-frequency signal transmission. These innovations are worth watching closely as they shape the next generation of mobile devices.
Source: Blog Stereo Circuit - (Industry Information Convergence)
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