電磁最佳化實驗室EM Optimization LabYen-Sheng Research Group, Department of Electronic Engineering

Smartphone industries seek to maximize screen size, but a perfect full-screen phone is not yet available due to the unoccupied area of mobile antennas. As a touchscreen is coated with transparent conductive layers, antennas below the touchscreen cannot create outward radiation. Accordingly, literature institutes a non-metallic area left for the antennas, which reduce the screen size. In this letter, we propose the design and integration of antennas for future millimeter-wave 5G smartphones that deploy perfect full-screen display. The proposed design consists of three modules, including 1 × 12 patch antenna array at 28 GHz, 1 × 8 patch array at 38 GHz, and loop antenna at 2.45 GHz. The design environment consists of fully metallic top and bottom enclosures, mimicking the touchscreen and the printed circuit board, respectively. The three antennas are implemented on the flanks. Although the design area is limited and contained in parallel conductive plates, the three antennas still provide broad impedance bandwidths (26.5‒32.0 GHz, 35.2‒42.0 GHz, and 2.41‒2.48 GHz) and high gain (16.7 dBi, 16.4 dBi, and 4.3 dBi). The isolation is larger than 20 dB, and the scanning ranges are ±45°. The proposed scheme is the first antenna system achieved in perfect full-screen display phones.