Nona-band, hybrid antenna for metal-rimmed smartphone applications

• Published in: IET microwaves, antennas & propagation Vol. 13; no. 14; pp. 2439 - 2448
• Main Authors: Alshamaileh, Mallak H, Alja'afreh, Saqer S, Almajali, Eqab
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 27.11.2019
• Subjects: antenna feeds; antenna radiation patterns; broadband antennas; capacitive coupling feed; coupled loop modes; dipole modes; direct coupling line; frequency 0.79 GHz to 6.0 GHz; grounding points; hybrid antenna; internal radiating structure; loop antennas; metal‐rim antenna structure; metal‐rimmed smartphone; microstrip antennas; microstrip feed; microwave antennas; mobile antennas; monopole antennas; monopole mode; multifrequency antennas; nona‐band antenna; printed circuit board; printed circuits; Research Article; size 5.0 mm; size 8.0 mm; size 80.0 mm; slot monopole modes; smart phones; UHF antennas; WiFi5500 bands; size 8.0 mm; size 80.0 mm; printed circuits; capacitive coupling feed; size 5.0 mm; antenna radiation patterns; loop antennas; UHF antennas; grounding points; antenna feeds; mobile antennas; WiFi5500 bands; direct coupling line; monopole antennas; microwave antennas; nona-band antenna; metal-rimmed smartphone; internal radiating structure; smart phones; printed circuit board; microstrip antennas; broadband antennas; dipole modes; microstrip feed; frequency 0.79 GHz to 6.0 GHz; monopole mode; multifrequency antennas; metal-rim antenna structure; hybrid antenna; coupled loop modes; slot monopole modes
• ISSN: 1751-8725; 1751-8733; 1751-8733
• DOI: 10.1049/iet-map.2019.0110

A new, hybrid, nona-band antenna of the size 80 × 8 × 5 mm3 is proposed for recent metal-rimmed smartphone applications. The proposed design is composed of a metallic frame (external antenna) and an internal radiating structure. The proposed antenna is attached to the top part of the smartphone. It uses a microstrip feed as a direct coupling line for the internal radiating structure. The feed also represents a capacitive coupling feed for the overall metal-rim antenna structure. The metal rim with a small gap of 2 mm is connected to the system printed circuit board by two grounding points. The proposed antenna excites four coupled loop modes, three slot monopole modes, three dipole modes, and one monopole mode. By incorporating the excited modes, the proposed antenna covers all recent smartphone applications in the frequency range between 0.79 and 6.0 GHz. The proposed design is described with great details and both simulated and measured results are used to establish its validity. The antenna performance with mobile phone components is also investigated. The results demonstrate that the proposed antenna represents an excellent candidate for applications such as GSM850, GSM900, GSM1800, GSM1900, UMTS2100, LTE2300, LTE2500, LTE3500, and WiFi5500 bands.