Abstract
This article presents an extremely low-profile tunable antenna design for smartphones with height of only 0.75 mm. The proposed antenna is integrated into the back cover of the device to utilize the existing gap between the battery and the back cover as efficiently as possible. By utilizing both tunable components and adjustable feeding weights, the designed multiport antenna system covers 3300–4200 MHz frequency range with 100 MHz instantaneous bands. In addition to just frequency tuning, these tunable elements can be utilized to adapt the antenna for different operation environments, such as changes in the structure of the device or the user effect. We show that the proposed antenna can be extended for two- and four-element multiple-input multiple-output (MIMO) operation. The proposed design is manufactured and measured, and the results confirm good antenna performance with average total efficiencies of 35% and 25% in free space and with a hand phantom, respectively.
Highlights
M OBILE antenna designers are facing major challenges in reaching the increasingly difficult goals set by both new mobile communication system standards as well as current trends in aesthetic design of the device
This paper presented an extremely low-profile antenna design for smartphone applications
The main radiator of the antenna is integrated into the back cover of the device on top of the battery and non-contacting exciter elements are placed on the main printed circuit board (PCB)
Summary
M OBILE antenna designers are facing major challenges in reaching the increasingly difficult goals set by both new mobile communication system standards as well as current trends in aesthetic design of the device. The volume is extremely limited with height less than 1 mm so very low-profile antennas which can be integrated into the device are needed. The impedance surfaces used by many designs require the utilization of the entire area of the device which makes it difficult to integrate with other components, such as the cameras. Many of these designs have been considered as lowprofile antennas, their sizes are still too large for the modern smartphones where only places with heights less than 1 mm are available. We design an extremely low-profile antenna that uses both tunable matching components and multiport feeding arrangement utilizing tunable feeding weights.
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