Reducing User Effect on Mobile Antenna Systems With Antenna Cluster Technique

Luomaniemi, Rasmus; Salmi, Albert; Lehtovuori, Anu; Viikari, Ville

doi:10.23919/eucap48036.2020.9135839

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…An important factor with the antenna clusters and the user effect is the way how the feeding signals and their reconfigurability is used. By properly adapting the feeding signals for the changing environment, it is possible to reduce the user effect [44]. In this work, in addition to the feeding signals, also the tunable capacitor values are reconfigured to the case where the user's hand is holding the device.…”

Section: User Effectmentioning

confidence: 99%

Extremely Low-Profile Tunable Multiport Handset Antenna

Luomaniemi

Lehtovuori

Ilvonen³

et al. 2022

IEEE Trans. Antennas Propagat.

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This paper 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 multipleoutput (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.

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Section: User Effectmentioning

confidence: 99%

Extremely Low-Profile Tunable Multiport Handset Antenna

Luomaniemi

Lehtovuori

Ilvonen³

et al. 2022

IEEE Trans. Antennas Propagat.

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“…In this way, the loss in antenna performance can be compensated for. While we limit our analysis to the free-space case in this work, this possibility has been studied in [32].…”

Section: A Antenna Cluster Techniquementioning

confidence: 99%

A 1.5–5-GHz Integrated RF Transmitter Front End for Active Matching of an Antenna Cluster

Saleem

Stadius

Hannula

et al. 2020

IEEE Trans. Microwave Theory Techn.

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A recently proposed method for realizing frequencyreconfigurable antennas across a wideband is based on adjusting the feed amplitudes and phases of a multiport antenna. In this article, we demonstrate the feasibility of the method, for the first time, with a conjunction of an integrated RF transmitter and a four-element antenna cluster. The implementation performs on-chip amplitude and phase tuning with supply scaling and delay tuning circuits to tune the antenna cluster without requirement of matching network. The antenna cluster is built with four closely spaced antenna elements implemented on a printed circuit board. The transmitter integrated circuit (IC) is implemented in a 28-nm CMOS process with the chip size of 0.85 mm × 0.95 mm, including pads. The proof-of-concept implementation demonstrates tunability across a wideband from 1.5 to 5 GHz.

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“…In [24], it has been shown that the antenna cluster technique can be used to effectively excite characteristic modes of a metal-rimmed device. Due to the distributed feeding and the possibility to adjust the feeding weights differently for use in free space and with the user, the cluster technique can also be used to reduce the user effect even with antenna designs that have not been originally designed to take this into account [25], [26].…”

Section: Introductionmentioning

confidence: 99%