Tri‐band compact antenna array for MIMO user mobile terminals at GSM 1800 and WLAN bands

Gómez-Calero, C.; González, L.; Martínez, Raquel

doi:10.1002/mop.23472

Cited by 8 publications

(5 citation statements)

References 4 publications

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“…The characteristic current modes J n are distinguished by their orthogonality properties and the associated linear independence. The sum of the weighted orthogonal functions of the current density in (1) gives the entire current density J of the specific surface. The α n denote the weighting coefficients of the characteristic current modes J n J = n a n J n…”

Section: Theory Of Characteristic Modes (Tcm)mentioning

confidence: 99%

“…In order to realise the desired data rates, for example, the long term evolution (LTE) and the IEEE 802.11n standard require the integration of multiple antenna systems to enable multiple-input-multiple-output (MIMO) technology in mobile terminals. In order to address the associated sub-channels, de-correlated antenna elements need to be integrated into the small terminal device with a tight form-factor [1].…”

Section: Introductionmentioning

confidence: 99%

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Systematic design method of a mobile multiple antenna system using the theory of characteristic modes

Martens¹,

Manteuffel²

2014

IET Microwaves, Antennas & Propagation

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In this study, the authors present a systematic design method of a three‐port multiple‐input–multiple‐output antenna system for small terminals, such as smart phones based on the selective excitation of orthogonal chassis modes. The underlying idea is based on the theory of characteristic modes (TCM). Selective excitation of these modes is realised by sets of non‐resonant inductive coupling elements integrated at predefined positions into the printed circuit board (PCB) layout. Stripline feed networks also integrated within the multi‐layer PCB layout care for a good impedance match to 50 Ω. The design method of this antenna system is a straight forward application of the TCM and is therefore of general interest for the design of small terminal antennas. Furthermore, owing to the electrically small couplers that require only limited area at the outer edge of the PCB the method represents an interesting solution with the clear potential to be extended to more ports. The realised prototype resembles the predicted performance very well and therefore proves the applicability of the proposed method.

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Section: Theory Of Characteristic Modes (Tcm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Systematic design method of a mobile multiple antenna system using the theory of characteristic modes

Martens¹,

Manteuffel²

2014

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

show abstract

“…The PIFAs have been designed with U-shaped slots in the radiating patch to obtain the desired resonant frequencies [7], as it is shown in Fig. 1.c).…”

Section: Antenna Arraysmentioning

confidence: 99%

Comparison of Different MIMO Antenna Arrays and User's Effect on Their Performances

Gómez-Calero

Jamaly

Martínez

et al. 2013

Micro & Optical Tech Letters

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Abstract-MIMO (Multiple-Input Multiple-Output) systems have entailed a great enhancement in wireless communications performances. The use of multiple antennas at each side of the radio link has been included in recent drafts and standards such as WLAN, WIMAX or DVB-T2. The MIMO performances depend on the antenna array characteristics and thus several aspects have to be taken into account to design MIMO antennas. In this paper, different types of antenna arrays are measured in a reverberation chamber with and without a phantom as a user's head. As a result, the MIMO performances are degraded by the user in terms of efficiency, diversity gain and capacity. Omnidirectional antennas such as monopoles with high radiation efficiency offer the highest performance for a rich scattering Non Line of Sight (NLoS) indoor environment.

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“…Antennas are indispensable front‐ends of modern communication systems. To enable more integrated communication systems, a multiple of antennas have to be accommodated in a shared compact limited platform in many applications . However, in such a multiple‐antenna system, various antennas operating at different frequencies may generate serious interferences in the small space, due to the large number of possible harmonics of these antennas.…”

Section: Introductionmentioning

confidence: 99%

“…To enable more integrated communication systems, a multiple of antennas have to be accommodated in a shared compact limited platform in many applications. 1,2 However, in such a multiple-antenna system, various antennas operating at different frequencies may generate serious interferences in the small space, due to the large number of possible harmonics of these antennas. Therefore, it is vital to suppress harmonic interferences within multipleantenna systems for electromagnetic compatibility.…”

Section: Introductionmentioning

confidence: 99%

Harmonic interference suppression within a multiple‐antenna system using integrated slender magnetic metamaterials

Yang

Wang

Han

et al. 2019

Micro & Optical Tech Letters

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In a multiple‐antenna system, harmonics of lower‐frequency antennas will interfere with higher‐frequency antennas, especially when the latter operates around the harmonic frequencies of the former. In this communication, we propose to suppress harmonic interferences in multiple‐antenna systems using integrated magnetic metamaterials (MM). To this end, we firstly designed a slender MM suitable for integration. Interdigital capacitor is adopted to make the MM slender enough to accommodate itself within the narrow gap between antennas. When magnetic field lines thread through the MM, negative permeability can be achieved due to strong magnetic resonance, which will block harmonic magnetic fields of an antenna penetrating into its neighbors. As an example, we investigated a dual patch‐antenna system, where the smaller one operates at the second‐harmonic frequency of the larger one and the MM is integrated in the gap between them. By adjusting structural parameters, the second‐harmonic magnetic fields of the larger antenna are blocked from penetrating into the smaller antenna. In this way, harmonic interferences within the antenna system can be suppressed. A prototype, together with a reference sample, was fabricated and measured. Both the measured and simulated results verify that with the MM, the harmonic coupling is reduced down to below −20 dB even when the gap between the two antennas is only about 0.06λ. Compared with the reference sample, the harmonic coupling is reduced by more than 7 dB. This work provides an alternative method of reducing harmonic interferences within multiple‐antenna systems to enhance the electromagnetic compatibility.

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Tri‐band compact antenna array for MIMO user mobile terminals at GSM 1800 and WLAN bands

Cited by 8 publications

References 4 publications

Systematic design method of a mobile multiple antenna system using the theory of characteristic modes

Systematic design method of a mobile multiple antenna system using the theory of characteristic modes

Comparison of Different MIMO Antenna Arrays and User's Effect on Their Performances

Harmonic interference suppression within a multiple‐antenna system using integrated slender magnetic metamaterials

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