A Frequency-Reconfigurable Tuner-Loaded Coupled-Fed Frame-Antenna for All-Metal-Shell Handsets

Han, Chong-Zhi; Huang, Guan‐Long; Yuan, Tao; Hong, Wonbin; Sim, Chow‐Yen‐Desmond

doi:10.1109/access.2018.2877637

Cited by 11 publications

(5 citation statements)

References 25 publications

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“…One way to improve the performance while making the antenna smaller is to introduce tunable components in the matching networks or as aperture matching components to cover only part of the band instantaneously. Traditional tuning methods include tunable capacitors or varactor diodes: [27]- [29], switches and PIN diodes [3], [30], [31], and switches connected to fixed inductors and capacitors [32]- [34]. In addition to these, the frequency tuning can also be realized with multiport antennas using the injection matching technique [35], [36] or the antenna cluster technique [37], [38].…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Extremely Low-Profile Tunable Multiport Handset Antenna

Luomaniemi

Lehtovuori

Ilvonen³

et al. 2022

IEEE Trans. Antennas Propagat.

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“…MIMO technology is one of the key technologies of future mobile and wireless communication systems. It employs a relatively complex multi-antenna system to overcome the multipath fading effect, and therefore further improves the spectral efficiency of UWB system [4,5]. Since MIMO antennas suffer from terrible coupling interference, researches concerning MIMO technology are mostly focused on how to suppress mutual coupling.…”

Section: Introductionmentioning

confidence: 99%

A butterfly-like slot UWB antenna with WLAN band-notch characteristics for MIMO applications

Wang

Chen

et al. 2022

IEICE Electron. Express

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An ultra-wideband (UWB) antenna with butterfly-like coupling slot for 4-element multiple-input multiple-output (MIMO) applications is introduced in this letter. In the design of the UWB antenna unit, the proposed butterfly-like slot is adopted to improve the impedance matching and achieves the operating bandwidth of 3-12 GHz. At the same time, a symmetrical T-shaped meandering strip etched on the ground and connecting with the patch through via produces a notch at 5.1-5.37 GHz, which suppresses the signal interference in WLAN band simultaneously. The results show that the proposed antenna array consisting of four orthogonal elements realized good isolation of lower than −15 dB without any additional decoupled structures. Also, the proposed 2 × 2 MIMO design exhibited good diversity performance in terms of envelop correction coefficient (ECC<0.015), diversity gain (DG>9.92 dB). The gain reaches a maximum value of 6.8 dBi. Simulated and Measured results are in good accordance. All of this reveals the effectiveness of the proposed antenna in MIMO system and it can be suggested as a suitable candidate for UWB applications.

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“…Frequency tuning and frequency reconfigurability have been popular techniques to improve the performance of mobile antenna systems in many published antenna designs. The frequency tuning or reconfigurability can be realized with, e.g., tunable capacitors [1]- [3], on/off-type switches [4], [5], and switches connected to multiple lumped matching components [6], [7]. These methods are based on using one or more tunable elements to modify the radiating structure or the matching circuits.…”

Section: Introductionmentioning

confidence: 99%

Reducing User Effect on Mobile Antenna Systems With Antenna Cluster Technique

Luomaniemi

Salmi

Lehtovuori

et al. 2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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This paper studies the use of antenna cluster technique in mobile antenna systems and especially its use in reducing the user effect. The study is conducted with measurements of two different antenna designs using a hand phantom to represent the user holding the device. The results show that antenna designs based on the antenna cluster technique can retain good performance in the presence of a user. Furthermore, the cluster technique can also be used to reduce the user effect by adapting the cluster operation for different environments.

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A Frequency-Reconfigurable Tuner-Loaded Coupled-Fed Frame-Antenna for All-Metal-Shell Handsets

Cited by 11 publications

References 25 publications

Extremely Low-Profile Tunable Multiport Handset Antenna

Extremely Low-Profile Tunable Multiport Handset Antenna

A butterfly-like slot UWB antenna with WLAN band-notch characteristics for MIMO applications

Reducing User Effect on Mobile Antenna Systems With Antenna Cluster Technique

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