Distributed Antenna Systems for Wireless Handheld Devices Robust to Hand Loading

e constant evolution of wireless handheld devices together with the apparition of multiple wireless communication systems fosters the antenna community to design new radiating and measurements systems capable of satisfying the market demands. It is an object of the present paper to provide an overview of the evolution that wireless handheld technology has experienced in the last years. In this sense, a description of the evolution of wireless handheld devices, regulations, challenges in today's smartphones, and handset characterization is reviewed. Finally, recent advances in antenna technology for wireless handheld or portable devices are presented.

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“…Electric models have been used to give a physical insight on the broadbanding mechanism of the distributed antenna systems [69].…”

Section: Robust Architectures To Handmentioning

confidence: 99%

Advances in Antenna Technology for Wireless Handheld Devices

Anguera

Andújar²,

Huynh

et al. 2013

International Journal of Antennas and Propagation

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102

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“…The user effects [29], [30], and the mitigation of these effects [31]- [33] are subjects of various recent studies. The electromagnetic interaction between the antenna and the user is also a radiation safety issue.…”

Section: A Radiation Interfacementioning

confidence: 99%

Capacitive Coupling Element Antennas for Multi-Standard Mobile Handsets

Valkonen

Kaltiokallio

Icheln

2013

IEEE Trans. Antennas Propagat.

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Antenna prototypes based on a simple capacitive coupling element (CCE) on a compact smartphone chassis are presented. This versatile antenna structure is easily modifiable with circuit design. We show with experimental data how the same CCE is implemented first with single-feed and then with dual-feed interface towards the transceiver front-end. These two antennas operate at the LTE-A frequencies 698-960 MHz and 1710-2690 MHz with good efficiency, owing to a novel dual-branch impedance matching circuit which utilizes the properties of the CCE and the chassis in a proficient way. A third antenna based on the same CCE is designed for a software defined radio receiver. This tunable antenna operates at 750-2500 MHz with acceptable efficiency.

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“…Consequently, recent efforts are addressed to increase the robustness of the radiating systems to the hand presence by adding multiple-antenna elements combined into a single input-output port through some phase delay mechanisms such as transmission lines. This is the case of the distributed antenna systems disclosed in [22]- [25], which are based on an out-of-phase feeding mechanism. However, although the previous technique considerably increases impedance bandwidth, its robustness to the hand loading is still dependent on the finger location.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…Thus and as presented in [22]- [25], array theory does not apply in distributed antenna system intended for wireless handheld devices since the ground plane radiating mode presents an important role in the radiation process that clearly conditions the radiation pattern. In this sense, the resulting radiation pattern at these mobile frequencies (824-960 MHz) mainly presents an omnidirectional behavior in one plane and a null along the long axis of the ground plane (Fig.…”

Section: B Measurementsmentioning

confidence: 99%

“…Both RLC series circuits and are characterized by an input resistance 20 , quality factor , and resonant frequency 900 MHz. solution to increase impedance bandwidth while providing robustness to the finger loading [22]- [25]. However, although the out-of-phase feeding mechanism allows significant bandwidth enhancement, it does not provide a symmetric solution, since hand loading effects are clearly dependent on the finger location.…”

Section: Introductionmentioning

confidence: 99%

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In-Phase Versus Out-of-Phase Distributed Antenna Systems for Wireless Handheld Devices

Andújar¹,

Anguera

Leiva

et al. 2013

IEEE Trans. Antennas Propagat.

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Hand loading usually degrades the performance of handset antennas. With the aim of providing a solution robust to the human presence, this paper discloses a distributed antenna system fed in-phase capable of mitigating undesirable hand loading effects while providing enhanced performance. The solution consists of a passive array of two resonant coplanar monopole antennas inspired in the Hilbert geometry. Input impedances of both monopoles are combined into a single input-output port through two transmission lines featuring equal phases. This combination allows not only improving the performance of the radiating system with respect to that attained by a single monopole antenna, but also providing a symmetric solution immune to the finger location. The solution is compared with a single monopole and a distributed antenna system fed out-of-phase. Simulated and measured results demonstrate that the proposed design is capable of providing operation in the communication standards GSM850/GSM900 as well as in the UHF part of the LTE-Advanced while maintaining the same electromagnetic performance with certain independence of the finger location.Index Terms-Broadband matching networks, electrical models, hand loading, handset antennas, low-profile, multi-band.

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Distributed Antenna Systems for Wireless Handheld Devices Robust to Hand Loading

Cited by 11 publications

References 27 publications

Advances in Antenna Technology for Wireless Handheld Devices

Advances in Antenna Technology for Wireless Handheld Devices

Capacitive Coupling Element Antennas for Multi-Standard Mobile Handsets

In-Phase Versus Out-of-Phase Distributed Antenna Systems for Wireless Handheld Devices

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