An ultrawideband antenna for portable MIMO terminals

Wani, Zamir; Vishwakarma, Dinesh Kumar

doi:10.1002/mop.29498

Cited by 8 publications

(8 citation statements)

References 16 publications

(19 reference statements)

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“…The 2 3 2 array has compact size of 14 3 31 5 434 mm 2 which is about 42, 62, 59, and 24% smaller than the UWB MIMO antenna reported in Ref. [4,6,7], and [9], respectively, whereas the 4 3 4 array has compact size of 31 3 315 961 mm 2 which is about 58, 61, 53, and 52% smaller than the UWB MIMO antennas in Refs. 8, 10-12, respectively.…”

mentioning

confidence: 84%

“…Therefore, the challenge is to place multiple UWB antennas with high isolation in space limited portable devices. A numbers of UWB MIMO antennas have already been reported with different decoupling structures, different configurations of antenna elements, different structures of antenna elements and so forth. Moreover, antenna element of different polarization has also employed to improve isolation as well as diversity …”

Section: Introductionmentioning

confidence: 99%

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Compact planar 2 × 2 and 4 × 4 UWB mimo antenna arrays for portable wireless devices

Sipal

Abegaonkar

Koul

2017

Micro & Optical Tech Letters

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A very compact 2 3 2 and 4 3 4 ultra wide band (UWB) multiple input multiple output (MIMO) antenna array with high isolation and polarization/pattern diversity are proposed in this letter. The compact size of antenna with orthogonally polarized elements help in achieving high isolation between elements of the arrays without using any decoupling circuit while maintaining its overall size very compact. The monopole UWB antenna prototype has compact size of 14 3 14 mm 2 and enlarged to 2 3 2 array having size of 14 3 31 mm 2 and 4 3 4 array having overall size of 31 3 31 mm 2 . The proposed designs have been fabricated and tested. Measured isolations |S 21 | are 225 dB and 220 dB for 2 3 2 and 4 3 4 arrays, respectively. However, impedance bandwidth |S 11 | is 210 dB for both arrays in the range from 3.6 to 10.6 GHz. The simulated, measured and calculated result shows good agreement for its impedance matching, isolation and dual polarization characteristics. Dual polarization improves its diversity performance and compact size improves its spatial multiplexing.mutual coupling, polarization/pattern diversity, UWB MIMO | I NT ROD UCTI ONMIMO technology has been drawing a lot of attention in modern wireless communication systems, because it satisfies the demand of high data rate system by using multiple antennas both at Tx and Rx with reduced multipath fading and increasing reliability.1 On the other hand, FCC (federal communication commission) has announced the range of frequency 3.1-10.6 GHz as unlicensed ultra wide band (UWB). UWB technology is promising for short distance communication because it provides high data rate with low power spectral density, but has issues of fading and reliability. Most of the papers mentioned above are reported with 2 3 2 configurations but to further enhance data capacity and signal reliability at once, more number of antennas are needed to deploy in a system. Some papers report 4 3 4 UWB MIMO antenna 8,10-12 but only few are feasible to use in a compact portable wireless devices due to its size constraints. To solve above mentioned issue, this article reports a very compact planner antenna with orthogonally polarized elements to improve isolation. The UWB MIMO antenna array covers the range from 3.6 to 10.6 GHz. The 2 3 2 array has compact size of 14 3 31 5 434 mm 2 which is about 42, 62, 59, and 24% smaller than the UWB MIMO antenna reported in Ref. [4,6,7], and [9], respectively, whereas the 4 3 4 array has compact size of 31 3 315 961 mm 2 which is about 58, 61, 53, and 52% smaller than the UWB MIMO antennas in Refs. 8, 10-12, respectively. The compact size of single UWB element helps in attaining very compact 2 3 2 and 4 3 4 MIMO arrays which are free from any decoupling and matching circuits. The simulated and measured results show that the proposed UWB MIMO antenna is good candidate for compact portable wireless devices such as USB dongle and others. | S I NG LE EL EME NT UW B M I MO A NTEN NAThe proposed UWB MIMO antenna is simulated in CST Microwave Studio simulator....

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mentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Compact planar 2 × 2 and 4 × 4 UWB mimo antenna arrays for portable wireless devices

Sipal

Abegaonkar

Koul

2017

Micro & Optical Tech Letters

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“…(a) Tree-like stub (Zhang et al, 2009) and (b) inverted L-shaped and I-shaped stub (Liu et al, 2013). (Mathur & Dwari, 2019a) and (b) F-shaped stubs and rectangular slots (Wani & Vishwakarma, 2016). Figure 16b for isolation and tilting the radiation pattern of one group resonating at 5.8 GHz by 45° as compared to another group resonating at 2.45 GHz.…”

Section: Parasitic Elements/structuresmentioning

confidence: 98%

A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures

et al. 2021

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With the advancement in the high data rates wireless transmission, the demand for high channel capacity planar antennas, especially for handheld devices, has shown a significant market. Multiple-Input-Multiple-Output (MIMO) antennas can fulfill the top requirement. MIMO antenna helps in increasing data throughput and link coverage without sacrificing additional bandwidth or increased transmit power (Kumar et al., 2018a, 2018b). The MIMO antenna's other advantages are: high data throughput and link range without additional spectrum requirement, increased transmit power, spatial diversity and pattern diversity, and less signal dropout (Kumar et al., 2019a). In MIMO, multiple antennas radiate simultaneously and act as a transmitter or receiver depending upon its purpose. Multiple antennas placed on a single substrate sharing at least one standard radiating frequency will be considered an MIMO antenna. The MIMO antenna should have a common ground, easing the integration with monolithic integrated circuits (ICs) (Kumar et al., 2020a). However, sometimes the MIMO antenna does not have a common ground plane, but such cases should be avoided for better integration purposes and standard voltage levels. MIMO antenna should be more compact to have a reduced form factor. The MIMO antenna's compactness is another primary concern when multiple antennas are placed on a single substrate. If the antenna element spacing is less than the λ 0 /2, i.e., half of the free-space wavelength, then the antenna suffers from the surface wave and the space wave coupling effect between the antenna elements (Dama et al., 2011). For that reason, as the compactness increases, the chances of MC effect increase, resulting in degradation in the MIMO antenna performance due to power losses in a rich scattering environment. Therefore, an effective isolation technique is a must in the design of a compact MIMO antenna. Besides this, pattern and spatial diversity

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“…In our design, the metamaterial unit cell array is fed by two dipole antennas in MIMO configuration. The antennas are separated by a distance S dd = 1.9 mm, and the mutual coupling between the ports due to surface waves is affected by adding a stub between the two antennas in the ground plane which introduces the resonance, and the surface current gets accumulated around the stub [19], resulting in enhancement of isolation between the ports. The isolation between the two antennas for different values of the stub length is shown in the Fig.…”

Section: Two Antenna Mimo Configurationmentioning

confidence: 99%

A 28-GHZ Antenna for 5g Mimo Applications

Wani¹,

Abegaonkar²,

Koul³

2018

PIER Letters

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121

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In this letter a four-port multi-input-multi-output (MIMO) antenna for 5G applications is proposed. This antenna is compact with a size of 11 mm × 31 mm excluding feed lines. The radiation patterns of the antenna show pattern diversity in the azimuthal plane, and each antenna element has an end-fire gain about 10 dBi by employing an array of metamaterial unit cells. The isolation between the antenna elements with edge to edge separation < λ 0 /5.5 at 28 GHz is enhanced by trimming the corners of the rectangular high refractive index metamaterial region along with a ground stub between antennas. The proposed antenna is fabricated, and each antenna element has return loss, S nn < −10 dB with isolation, S nm > 21 dB in the frequency range 26 GHz to 31 GHz, which makes this antenna potential candidate for MIMO application at 28 GHz band enabling 5G cellular communications.

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An ultrawideband antenna for portable MIMO terminals

Cited by 8 publications

References 16 publications

Compact planar 2 × 2 and 4 × 4 UWB mimo antenna arrays for portable wireless devices

Compact planar 2 × 2 and 4 × 4 UWB mimo antenna arrays for portable wireless devices

A Review on Different Techniques of Mutual Coupling Reduction Between Elements of Any MIMO Antenna. Part 1: DGSs and Parasitic Structures

A 28-GHZ Antenna for 5g Mimo Applications

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