Analysis of MIMO Diversity Improvement Using Circular Polarized Antenna

Wang, Jianquan; Lv, Zhaobiao; Li, Xinzhong

doi:10.1155/2014/570923

Cited by 17 publications

(11 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, CP antennas effectively alleviate the multipath fading effects and are also robust to polarization mismatch [9], [10]. Furthermore, the strength of the electromagnetic (EM) signals received at the wireless terminals is relatively constant, irrespective of the CP antennas orientation [11], [12]. These properties of CP antennas make them potential candidates for the upcoming MIMO wireless systems.…”

Section: Introductionmentioning

confidence: 99%

Planar Four-Port Dual Circularly-Polarized MIMO Antenna for Sub-6 GHz Band

Saxena¹,

Kanaujia²,

Dwari³

et al. 2020

IEEE Access

View full text Add to dashboard Cite

In this work, two configurations (Config.-A and Config.-B) of planar four-port dual circularlypolarized (CP) multiple-input-multiple-output (MIMO) antenna are proposed for sub-6 GHz (3.4-3.8 GHz) applications. The MIMO antennas are designed on the FR-4 substrate with size of 60×60×1.6 mm 3. Each radiating element (unit cell) of the MIMO antenna is comprised of a microstrip feed line and an open slot ground plane integrated with two rectangular arms for realizing circular polarization. An I-shaped metallic strip is used in the proposed four-port MIMO Config.-A and Config.-B antennas for obtaining common voltage level in the ground plane. Both MIMO antenna configurations exhibit good impedance matching in the band of interest. In the MIMO Config.-A antenna, all ports provide the same CP band, while in the Config.-B antenna the ports-1/-2 and-3/-4 radiate at different CP bands. The proposed MIMO Config.-A and Config.-B antennas support both types of polarization (left-hand circular polarization (LHCP) and right-hand circular polarization (RHCP)). With the Config.-B antenna, the maximum 3-dB axial-ratio (AR) beamwidths of 118.9 • and 92.7 • are obtained at 3.536 GHz in the xz-and yz-planes, respectively. Furthermore, the Ishaped strip helps in improving 3-dB AR beamwidth in the MIMO Config.-B antenna. Inter-element isolation greater than 19 dB and envelope correlation coefficient (ECC) less than 0.12 (far-field) are achieved between the ports of the fabricated MIMO antenna prototype. INDEX TERMS Connected ground, dual circular polarization, four-port, MIMO antenna, planar.

show abstract

Section: Introductionmentioning

confidence: 99%

Planar Four-Port Dual Circularly-Polarized MIMO Antenna for Sub-6 GHz Band

Saxena¹,

Kanaujia²,

Dwari³

et al. 2020

IEEE Access

View full text Add to dashboard Cite

show abstract

“…The antennas operate in circular polarization, permitting a reliable link regardless of the relative orientation of the tag [ 19 , 25 , 26 ]. Furthermore, circular polarization is a strong aid in contrasting multipath impairment [ 27 , 28 , 29 ]. A set of patterns is projected over different spatial areas [ 19 ] and for each anchor tag data packet a complete RSSI vector for each antenna, called the steering vector, is given.…”

Section: Proposed Hardware Infrastructurementioning

confidence: 99%

An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

Passafiume

Maddio

Cidronali

2017

Sensors

View full text Add to dashboard Cite

Assuming a reliable and responsive spatial contextualization service is a must-have in IEEE 802.11 and 802.15.4 wireless networks, a suitable approach consists of the implementation of localization capabilities, as an additional application layer to the communication protocol stack. Considering the applicative scenario where satellite-based positioning applications are denied, such as indoor environments, and excluding data packet arrivals time measurements due to lack of time resolution, received signal strength indicator (RSSI) measurements, obtained according to IEEE 802.11 and 802.15.4 data access technologies, are the unique data sources suitable for indoor geo-referencing using COTS devices. In the existing literature, many RSSI based localization systems are introduced and experimentally validated, nevertheless they require periodic calibrations and significant information fusion from different sensors that dramatically decrease overall systems reliability and their effective availability. This motivates the work presented in this paper, which introduces an approach for an RSSI-based calibration-free and real-time indoor localization. While switched-beam array-based hardware (compliant with IEEE 802.15.4 router functionality) has already been presented by the author, the focus of this paper is the creation of an algorithmic layer for use with the pre-existing hardware capable to enable full localization and data contextualization over a standard 802.15.4 wireless sensor network using only RSSI information without the need of lengthy offline calibration phase. System validation reports the localization results in a typical indoor site, where the system has shown high accuracy, leading to a sub-metrical overall mean error and an almost 100% site coverage within 1 m localization error.

show abstract

“…The effect of CP on MIMO can be accounted as an increase of diversity gain, throughput, data rate, and capacity [18]. Similarly, to broaden the bandwidth of the CP array, multiple layers of substrate are also required along with the feed structure to make all the elements to be 90 • phase shifted with equal amplitudes [19], and high gain can be achieved [20].…”

Section: Introductionmentioning

confidence: 99%

Circularly Polarized 2×2 Mimo Antenna for Wlan Applications

Malviya¹,

Panigrahi²,

Kartikeyan³

2016

PIER C

View full text Add to dashboard Cite

Abstract-A 2 × 2 circularly polarized (CP) MIMO antenna is proposed to resonate at 5.8 GHz IEEE 802.11 WLAN band for non-line of sight (NLOS) communication. The proposed design achieves circular polarization with two optimized 90 • apart rectangular slots etched at the center of a truncated rectangular patch. The proposed MIMO covers 5.49-6.024 GHz frequency band. The achieved isolation between two ports is more than 33 dB. The gain at the 5.8 GHz resonant frequency is 5.34 dBi. The diversity performance in terms of gain, ECC, and MEG has been reported.

show abstract

Analysis of MIMO Diversity Improvement Using Circular Polarized Antenna

Cited by 17 publications

References 3 publications

Planar Four-Port Dual Circularly-Polarized MIMO Antenna for Sub-6 GHz Band

Planar Four-Port Dual Circularly-Polarized MIMO Antenna for Sub-6 GHz Band

An Improved Approach for RSSI-Based only Calibration-Free Real-Time Indoor Localization on IEEE 802.11 and 802.15.4 Wireless Networks

Circularly Polarized 2×2 Mimo Antenna for Wlan Applications

Contact Info

Product

Resources

About