Wideband High-Performance Antenna Design with Enhanced Pattern Integrity for mm-Wave 5G Smartphones Applications

This paper presents a wideband antenna system for 5G smartphones, integrating a Dipole Antenna with a Substrate Integrated Waveguide (SIW). Integrating the Dipole antenna with SIW mitigates transition losses between the feed port and radiator, enhancing efficiency at the mm-wave frequency band. The SIW structure further suppresses surface waves, improving radiation efficiency while maintaining excellent pattern integrity. The antenna operates broadly from (24.2%) 28.4 to 36.2 GHz. The proposed orthogonal antenna topology accommodates real-world usage scenarios, allowing seamless operation in single- and dualhand modes. The compact design fits within modern 5 G smartphone panel constraints, precisely an 8 mm height, making it highly practical for integration. Additionally, the antenna achieves a mutual coupling lower than 11 dB. Attention to user safety is also prioritized, with radiation exposure to the user minimized upon integrating the antenna into the smartphone panel. This wideband operation, low mutual coupling, high pattern integrity, and user-centric design overcomes the challenges associated with 5G antenna systems, ensuring robust and reliable communication in compact smartphone platforms.