The development of wireless communication technology has significantly accelerated the growth of the antenna industry. Smartphones are currently the most widely used and versatile electronic devices globally. According to IHS, global smartphone shipments exceeded 1.5 billion units in 2017. While users often focus on features like screen quality, camera performance, memory capacity, processors, and software, the antennas located at the front end of the radio are usually overlooked. Despite being hidden from view, they play a critical role in enabling seamless communication. As an essential component of wireless systems, antenna innovation is one of the core drivers behind the advancement of wireless connectivity. With the rise of 5G and IoT, the antenna industry is expected to be among the fastest-growing and most promising sectors in the future.
Antennas are passive devices responsible for transmitting and receiving radio frequency signals. They directly impact key communication metrics such as signal strength, bandwidth, and connection speed. In smartphones, multiple RF front-end modules—such as cellular (LTE/TD-SCDMA/FD-SCDMA/WCDMA/CDMA2000/GSM), Bluetooth, Wi-Fi, GPS, and NFC—are integrated to support a wide range of functions including voice calls, video streaming, internet access, location tracking, and data transfer. All these functions depend on the antenna’s ability to send and receive signals effectively, making it a crucial part of any wireless communication system. For example, the iPhone 6s includes several antenna modules that enable 2G/3G/4G cellular communication, Wi-Fi, Bluetooth, GPS, and NFC, each playing a vital role in the device's overall functionality.
Soft boards have become the mainstream technology for terminal antennas due to their flexibility and adaptability. Antennas can be categorized into network coverage transmission antennas and terminal antennas. Terminal antennas are found in devices like smartphones, laptops, and GPS modules. As smartphones evolved from external to internal designs, soft boards emerged as the dominant solution. Today, over 70% of the board antenna market is dominated by flexible circuits. These boards offer high wiring density, lightweight design, and excellent flexibility, making them ideal for modern electronics. Their applications span across various industries, from hard drive ribbons to automotive electronics, cameras, and medical devices. The demand for soft boards is growing rapidly, especially with the rise of high-end, miniaturized devices like smartphones, tablets, and wearables.
However, traditional soft boards made from polyimide (PI) face limitations when it comes to high-frequency and high-speed applications. PI substrates suffer from high dielectric loss, moisture absorption, and poor reliability, which make them unsuitable for 5G and millimeter-wave technologies. To address these challenges, Liquid Crystal Polymer (LCP) has emerged as a superior alternative. LCP offers exceptional electrical properties, including a stable dielectric constant up to 110 GHz, low tangent loss (0.002–0.0045), and minimal thermal expansion. These characteristics make LCP ideal for high-frequency and high-speed applications, such as 5G antennas, COF substrates, and high-density PCBs.
One of the major advantages of LCP is its ability to achieve higher levels of miniaturization compared to traditional PI soft boards. As smartphones continue to trend toward full-screen designs, more components, and larger batteries, the space available for antennas is shrinking. LCP soft boards are not only thinner but also more flexible, allowing them to fit into tight spaces and reduce overall device thickness by up to 65%. This makes them ideal for replacing coaxial cables and improving space efficiency. For instance, Murata’s MetroCirc product demonstrates how LCP can be perfectly fitted around the battery, maximizing space utilization without sacrificing performance.
In summary, as the demand for faster and more reliable wireless communication continues to grow, LCP-based soft boards are set to replace traditional PI boards in the next generation of mobile devices. Their superior performance, flexibility, and miniaturization capabilities make them the preferred choice for future 5G and IoT applications.
DP Cables
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