A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

Tripathi, Shrivishal; Mohan, Akhilesh; Yadav, Sandeep

doi:10.1109/lawp.2015.2412659

Cited by 222 publications

(173 citation statements)

References 25 publications

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“…Implementation of proper slots having specific locations on printed antennas is generally used for the excitation of additional operating frequencies , band stopping , antenna miniaturization , gain and bandwidth enhancements . In this study, slot loading technique was employed to cover the 2.4 GHz – 2.5 GHz band by implementing an inverse symmetric U slot on the radiating patch.…”

Section: Element Antenna Design and Resultsmentioning

confidence: 99%

“…CPW‐fed MIMO antenna was designed by using two element antennas and they were placed orthogonally in order to utilize the polarization diversity and reduce the mutual coupling between them . The distance between the element antennas was optimized to avoid bandwidth deteriorations by considering compactness.…”

Section: Mimo Antenna Design and Resultsmentioning

confidence: 99%

“…The detailed information about CPWs can be found in . Even though there are some studies about CPW‐fed MIMO antennas in the literature , they do not cover all the bands given in Table . Therefore, in this letter, multi‐band CPW‐fed MIMO antenna for Bluetooth, WLAN and WiMAX applications is investigated.…”

Section: Introductionmentioning

confidence: 99%

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Multi‐band CPW fed MIMO antenna for bluetooth, WLAN, and WiMAX applications

Desde

Bozdağ

Kustepeli

2016

Micro & Optical Tech Letters

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In this letter, multi-band coplanar waveguide (CPW) fed multiple-input-multiple-output (MIMO) antenna is presented for Bluetooth, WLAN and WiMAX applications. The elements of MIMO antenna are identical CPW-fed printed monopole antennas whose bandwidth performances are improved by employing inverse U and meander line slots. In the design of the antennas, a low-cost FR4 substrate is used and the size of the element antennas are optimized as 35 mm x 30 mm. According to the measurements, S 11 is below 210 dB in 2.38 GHz -2.52 GHz and 3.19 GHz -6.44 GHz bands with 0.2 dB and 2.9 dB average peak realized gains, respectively. The element antennas are placed orthogonally and fed independently to obtain MIMO structure whose size is optimized as 42 mm x 62 mm. The performance of MIMO antenna is also examined in terms of diversity parameters such as envelope correlation coefficient and apparent diversity gain, which are lower than 0.02 and higher than 9.9 in the operating bands, respectively.

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Section: Element Antenna Design and Resultsmentioning

confidence: 99%

Section: Mimo Antenna Design and Resultsmentioning

confidence: 99%

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Multi‐band CPW fed MIMO antenna for bluetooth, WLAN, and WiMAX applications

Desde

Bozdağ

Kustepeli

2016

Micro & Optical Tech Letters

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“…The envelope correlation coefficient (ECC) is an important constraint to analyze the diversity characteristics of a wideband MIMO antenna [21][22][23]. It is evaluated with the help of S-parameters as given in [13,21]:…”

Section: Diversity Performancementioning

confidence: 99%

A Compact Mimo/Diversity Antenna With Wlan Band-Notch Characteristics for Portable Uwb Applications

Tripathi¹,

Mohan²,

Yadav³

2017

PIER C

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Abstract-In this paper, a compact multiple-input-multiple-output (MIMO)/diversity antenna with WLAN band notch characteristics, high isolation, and good ECC suitable for portable ultra-wideband (UWB) applications is presented. The proposed antenna has optimized dimensions of 29 mm × 38 mm. The antenna consists of two orthogonal circular monopoles with a 50 Ω microstrip feed line. In addition, to enhance the impedance bandwidth, a fractal slot, created using Minkowski fractal geometry, is introduced into the ground plane, which is located on the other side of the substrate, just below the feed line. Good isolation (≥ 21.5 dB) with a fractional bandwidth up to 220% is achieved between antenna elements by introducing two ground stubs and a rectangular slot in the ground plane. A band-notch characteristic in the WLAN band is obtained by etching an elliptical split-ring resonator (ESRR) in the radiator. Moreover, a diversity performance of the antenna in terms of ECC (< 0.01) and capacity loss (< 0.3 b/s/Hz) is performed. This paper offers, for the first time, a combined effect of fractal geometry and ESRR geometry in an antenna design. Finally, a comparison of the proposed antenna is performed with the UWB MIMO/diversity antennas existing in the literature. These results show the suitability of the presented antenna for portable UWB systems.

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“…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%

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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A Compact Koch Fractal UWB MIMO Antenna With WLAN Band-Rejection

Cited by 222 publications

References 25 publications

Multi‐band CPW fed MIMO antenna for bluetooth, WLAN, and WiMAX applications

Multi‐band CPW fed MIMO antenna for bluetooth, WLAN, and WiMAX applications

A Compact Mimo/Diversity Antenna With Wlan Band-Notch Characteristics for Portable Uwb Applications

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

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