Abstract

The design of a reconfigurable three-dimensional (3-D) slot antenna for 4G and sub-6G smartphone application is presented in this paper. The antenna is located at the bottom of the smartphone and integrated with a metallic casing. Positive-Intrinsic-Negative (PIN) diodes are loaded at the dual-open slot and the folded U-shaped slot, respectively, which are used to realize four working states. The antenna has a compact volume of 42 × 6 × 6 mm3, which can cover the long term evolution (LTE) bands of 698–960 MHz and 1710–2690 MHz, and the sub-6G bands of 3300–3600 MHz & 4800–5000 MHz. The design processes are presented and the structure is optimized, fabricated and measured. The comparison to other state-of-the-art antennas shows that the proposed design has multiband characteristics with small size.

Highlights

  • The wireless communication network environment has become a mixture of different kinds of heterogeneous networks

  • From November 2017, the frequency spectrums of 3300–3600 MHz and 4800–5000 MHz have been identified for fifth-generation (5G) application by the ministry of industry and information technology of the People’s Republic of China [2]

  • The idea of the design starts from a end simplethe open-ended slot and antenna, as shown in FigureThe is etched on the edge of a metal

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Summary

Introduction

The wireless communication network environment has become a mixture of different kinds of heterogeneous networks. The WRC-15 (Word Radio Communication Conference 2015) identified the frequency spectrum of 3400–3600 MHz for global mobile broadband services in November 2015 [1]. From November 2017, the frequency spectrums of 3300–3600 MHz and 4800–5000 MHz have been identified for fifth-generation (5G) application by the ministry of industry and information technology of the People’s Republic of China [2]. 698–960 MHz and 1710–2690 MHz for fourth-generation (4G) mobile communications [3]. To provide these services for different frequencies and communication protocols, the antenna in smartphones should cover multiple bands. In order to meet the consumers’ requirements, the mobile phones are being designed to provide a low profile and a large display with a narrow frame for entertainment. Designing a multiband/wideband mobile phone antenna with limited space is undoubtedly a technological challenge

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