We are proud to introduce an innovative dual-band (28/39 GHz) 1×4 antenna array, specifically designed for 5G mobile applications. This design aims to achieve dual-band operation and higher isolation within an ultra-compact size of just 3.8×23mm² in an antenna-in-package (AiP) module.
🔍 Design Highlights
Our antenna design utilizes a frequency selective surface (FSS) on a multi-layer organic substrate to achieve compact size and dual-band antenna for 5G mobile applications. The proposed antenna comprises a low-band (LB) and high-band (HB) element, with the HB element positioned coaxially beneath the radiator of the LB element to minimize overall size. The LB element features a double-layer FSS-based antenna and differential pairs of feeding probes, while the passband of the FSS antenna is designed to cover the operating band of the HB element, enabling transmission of HB element radiation through the FSS radiator of the LB element.
💡 High Gain Performance
We’ve built a prototype of the dual-band antenna, operating in the LB frequency range of 26−29GHz and the HB frequency range of 39−43GHz. The prototype demonstrates a high gain of approximately 10 dBi in the LB and 12 dBi in the HB within a compact AiP module of 3.8×23mm2. The proposed antenna is designed for ease of fabrication and cost-effectiveness, making it suitable for 5G mmWave smartphone with support for multiband applications.
Conclusion
By incorporating FSS technology into a multi-layer organic substrate, this design achieves a compact form factor, high gain, and dual-band functionality, all while maintaining performance and cost efficiency. Consequently, it represents an optimal solution for next-generation mobile devices that demand multi-band mmWave capabilities.
Published in: 2025 IEEE 75th Electronic Components and Technology Conference (ECTC)
