Compact metamaterial antenna array for long term evolution (LTE) handset application

López, Norberto; Lee, Cheng-Jung; Gummalla, A.; Achour, Maha

doi:10.1109/iwat.2009.4906933

Cited by 29 publications

(34 citation statements)

References 5 publications

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“…Figure 8(a) shows the lower band S-parameter measurements, while Figure 8(b) shows the higher band ones. The lower band covered the frequency ranges † The −6 dB BW is widely accepted for evaluating closely packed MIMO antenna systems such as in [24][25][26][27]. from 827-853 MHz and 831-856 MHz for elements 1 and 2, respectively.…”

Section: Resultsmentioning

confidence: 99%

Isolation Improvement in a Dual-Band Dual-Element Mimo Antenna System Using Capacitively Loaded Loops

Sharawi¹,

Numan²,

Aloi³

2013

PIER

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Abstract-A dual-band dual-element multiple-input-multiple-output (MIMO) antenna system with enhanced isolation is proposed. The MIMO antenna system is based on printed 4-shaped antenna elements. Dual band isolation is achieved by using an array of printed capacitively loaded loops (CLLs) on the top side of the board for high band isolation improvement and a complementary CLL structure on the GND plane of the antenna for lower band isolation improvement. The lower band of operation covers 827-853 MHz and the higher band covers 2.3-2.98 GHz. Two prototypes were investigated to access the effect of the isolation mechanism. Measured isolation improvement of 10 dB was observed in the lower operating band while the improvement in the higher band was approximately 2.5 dB. The isolation improvement was at the expense of 5% reduction in efficiency. The measured gain patterns as well MIMO figures of merits such as the correlation factor, TARC and MEG were investigated as well.

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Section: Resultsmentioning

confidence: 99%

Isolation Improvement in a Dual-Band Dual-Element Mimo Antenna System Using Capacitively Loaded Loops

Sharawi¹,

Numan²,

Aloi³

2013

PIER

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“…As shown in the figure, the approximation has good match with the exact numerical results. Hence, the self-and mutual inductance in M 2 I communications can be accurately and explicitly expressed by (10), (11), and (12). Then the channel path loss of the M 2 I point-to-point and waveguide communication can be derived by substituting L and M into (1b) and (2).…”

Section: B Modeling the Metamaterial-manipulated Em Field In Mmentioning

confidence: 99%

“…2) Optimal Configuration of M 2 I Communications: The transmitter and receiver are connected by mutual inductance M. According to (11), M can be maximized if det( S meta ) is zero (i.e., det(S meta ) is very small). There exists an optimal metamaterial sphere thickness r 1 that can greatly reduce the value of det(S meta ).…”

Section: B Modeling the Metamaterial-manipulated Em Field In Mmentioning

confidence: 99%

“…Metamaterials are artificial structures made of carefully designed building blocks, which can generate unique physical phenomenon such as backward waves and negative refraction index [7], [8]. The novel properties of metamaterials have been utilized in subwavelength imaging [9], wireless power transfer [10], and antenna miniaturization [11]. Since the key problem of the MI communication technique is the fast fall-off rate in near field, we see great potentials in using metamaterials to enhance MI-based communications and finally achieve both extended medium…”

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confidence: 99%

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<inline-formula><tex-math notation="LaTeX">$\text{M}^2\text{I}$</tex-math></inline-formula>: Channel Modeling for Metamaterial-Enhanced Magnetic Induction Communications

Guo

Sun

et al. 2015

IEEE Trans. Antennas Propagat.

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Magnetic Induction (MI) communication technique has shown great potentials in complex and RF-challenging environments, such as underground and underwater, due to its advantage over EM wave-based techniques in penetrating lossy medium. However, the transmission distance of MI techniques is limited since magnetic field attenuates very fast in the near field. To this end, this paper proposes Metamaterial-enhanced Magnetic Induction (M 2 I) communication mechanism, where a MI coil antenna is enclosed by a metamaterial shell that can enhance the magnetic fields around the MI transceivers. As a result, the M 2 I communication system can achieve tens of meters communication range by using pocket-sized antennas. In this paper, an analytical channel model is developed to explore the fundamentals of the M 2 I mechanism, in the aspects of communication range and channel capacity, and the susceptibility to various hostile and complex environments. The theoretical model is validated through the finite element simulation software, Comsol Multiphysics. Proof-of-concept experiments are also conducted to validate the feasibility of M 2 I. Index TermsMetamaterial-enhanced Magnetic Induction, Wireless Communications, RF-challenging Environments.I. Introduction Despite the presence of wireless connectivity in most terrestrial scenarios, there are still many hostile and complex environments that cannot be covered by existing wireless communication techniques, including underground, underwater, oil reservoirs, groundwater aquifers, nuclear plants, pipelines, tunnels, and concrete buildings. Wireless networks in such environments can enable important applications in environmental, industrial, homeland security, and military fields, such as monitoring and maintenance of groundwater and/or oil reservoirs [1], or damage assessment and mitigation in nuclear plants [2], among others. However, the harsh wireless channels prevent the direct usage of conventional electromagnetic (EM) wave-based techniques due to the high material absorption when penetrating lossy media.Among potential solutions, the Magnetic Induction (MI) technique has shown great potentials in underground [3] and underwater [4] environments. In a MI communication system, the HF band magnetic field generated by a MI transmitter coil is utilized as the signal carrier [5]. Since most natural media have the same magnetic permeability as air, MI keeps the same performance in most materials. Even in lossy media like groundwater, the MI path loss caused by skin depth can be minimized since MI communication is realized within one wavelength from the transmitter [6]. In addition, MI does not suffer from the multipath fading problem in EM wave-based solutions [4]. However, MI systems depend on the magnetic field generated by the transceivers in the near field, which attenuates very fast. Consequently, the range of MI communication is very limited.To this end, we introduce metamaterials to MI communications, which can manipulate and enhance the magnetic fields transmitted and...

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“…For the lower bands, LTE 700 and 800, the ground plane of a typical bar-type mobile phone is less than λ/10 wide and λ/5 long, and the spacing of the antennas is between λ/50 and λ/10, which results in a high mutual coupling. The authors of [7] present the use of metamaterials to limit the currents on the ground plane, thus reducing the high coupling at these low frequencies. In [8], a hybrid coupler with lumped components is used, while in [9], a connecting strip between the antennas is implemented to solve the same problem using the principle shown in [4].…”

Section: Introductionmentioning

confidence: 99%

Port Isolation Method for MIMO Antenna in Small Terminals for Next Generation Mobile Networks

Tatomirescu

Pelosi

Knudsen³

et al. 2011

2011 IEEE Vehicular Technology Conference (VTC Fall)

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Abstract-This paper presents a practical method to increase the isolation between two ports of a Multiple Input Multiple Output (MIMO) antenna for mobile hand-held devices. The method consists in a connecting strip containing lumped components placed in between the low impedance zones of the two antennas. The lumped components modify the impedance of the connecting strip so that, together with the mutual coupling impedance, it acts as a band-stop filter between the two ports.As a consequence, the efficiency due to scattering parameters almost doubles and the envelope correlation coefficient decreases dramatically. Furthermore, the use of lumped components makes this method less susceptible to the presence of other components in the mobile device or the user. This method has been verified on two antenna configurations, through simulation and measurements.

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Compact metamaterial antenna array for long term evolution (LTE) handset application

Cited by 29 publications

References 5 publications

Isolation Improvement in a Dual-Band Dual-Element Mimo Antenna System Using Capacitively Loaded Loops

Isolation Improvement in a Dual-Band Dual-Element Mimo Antenna System Using Capacitively Loaded Loops

<inline-formula><tex-math notation="LaTeX">$\text{M}^2\text{I}$</tex-math></inline-formula>: Channel Modeling for Metamaterial-Enhanced Magnetic Induction Communications

Port Isolation Method for MIMO Antenna in Small Terminals for Next Generation Mobile Networks

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