Abstract
In this study, we propose a design of a multi-band slot antenna array applicable for fourth-generation (4G) and fifth-generation (5G) smartphones. The design is composed of double-element square-ring slot radiators fed by microstrip-line structures for easy integration with radio frequency (RF)/microwave circuitry. The slot radiators are located on the corners of the smartphone printed circuit board (PCB) with an overall dimension of 75 × 150 mm2. The proposed multiple-input multiple-output (MIMO) antenna is designed to meet the requirements of 4G and 5G mobile terminals with essential bandwidth for higher data rate applications. For −10 dB impedance bandwidth, each single-element of the proposed MIMO design can cover the frequency ranges of 2.5–2.7 GHz (long-term evolution (LTE) 2600), 3.45–3.8 GHz (LTE bands 42/43), and 5.00–5.45 GHz (LTE band 46). However, for −6 dB impedance bandwidth, the radiation elements cover the frequency ranges of 2.45–2.82 GHz, 3.35–4.00 GHz, and 4.93–5.73 GHz. By employing the microstrip feed lines at the four different sides of smartphone PCB, the isolation of the radiators has been enhanced and shows better than 17 dB isolation levels over all operational bands. The MIMO antenna is implemented on an FR-4 dielectric and provides good properties including S-parameters, efficiency, and radiation pattern coverage. The performance of the antenna is validated by measurements of the prototype. The simulation results for user-hand/user-head impacts and specific absorption rate (SAR) levels of the antenna are discussed, and good results are achieved. In addition, the antenna elements have the potential to be used as 8-element/dual-polarized resonators.
Highlights
With the development of wireless communication techniques, multiple-input multiple-output (MIMO) technology is attracting attention [1]
It is known that MIMO operation can highly improve the data rate, capacity, and link reliability of wireless communication systems [2]
The antenna contains four double-element square-ring slot radiators placed at different future mobile terminals
Summary
With the development of wireless communication techniques, multiple-input multiple-output (MIMO) technology is attracting attention [1]. Several designs of MIMO antennas were reported for future smartphone applications [5,6,7,8,9,10,11]. All these antennas only support one mobile terminal, and they have some limitations, such as being narrow-band. The antenna contains four double-element square-ring slot radiators placed at different future mobile terminals. The antenna contains four double-element square-ring slot radiators placed corners of the smartphone circuit board circuit (PCB) to provide fulltoradiation.
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