Circular Polarized Ground Radiation Antenna for Mobile Applications

Qu, Longyue; Zahid, Zeeshan; Kim, Hyung-Hoon; Kim, Hyeongdong

doi:10.1109/tap.2018.2811840

Cited by 23 publications

(16 citation statements)

References 25 publications

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“…The AR bandwidth achieved in [12] is mainly attributed to larger ground size and additional T-shaped structure. However, the matching bandwidths of [14,[26][27][28] are higher than the proposed antenna, mainly because of the additional GMT structure. Furthermore, the MIMO performance of the proposed antenna is better than that of [14].…”

Section: Measured Results and Discussionmentioning

confidence: 86%

“…The GMT consists of a metal strip attached at the periphery of the ground plane through an inductor. The structures were used to design CP antennas for mobile devices in various studies [26][27][28]. A CP antenna was proposed in [29] for arbitrary location on the ground plane where parasitic structures were used for phase compensation and magnitude regulation.…”

Section: Introductionmentioning

confidence: 99%

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Slot-Type Mimo Antenna With Pattern and Circular Polarization Diversity for Mobile Applications

Ullah¹,

Zahid²

2020

PIER M

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Here we propose an L-shaped slot-type MIMO antenna with pattern and circular polarization diversity for WLAN applications. In order to maintain a low profile, the pattern and polarization diversities have been achieved without using additional supporting structures. Both the antenna elements are located at the corners of the same side of the ground plane. One of the antenna elements produces left hand circularly polarized (CP) waves whereas the other element produces right hand CP waves in (front) +z-direction. The senses of polarizations are opposite in (backward) −zdirection. CP waves have been generated using two orthogonal current modes, excited by locating the slots on the corner of the ground plane. The quadrature phase difference between the modes has been employed using the slot geometry. In other directions, the antenna correlation has been reduced using pattern diversity. The measured results confirm the simulated ones. The measured axial ratio bandwidth (< 3 dB) and the matching bandwidth (< −6 dB) are 380 MHz and 110 MHz, respectively. The envelop correlation coefficient is less than 0.1 in the operating band.

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Section: Measured Results and Discussionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Slot-Type Mimo Antenna With Pattern and Circular Polarization Diversity for Mobile Applications

Ullah¹,

Zahid²

2020

PIER M

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“…Several countries specify the spectrum for Sub-6 GHz for 5G, which includes 2.5-2.6 GHz, 3.3-3.8 GHz, 4.5-5 GHz, and 3.8-4.2 GHz frequency bands [1]. Multiple-Input and Multiple-Output (MIMO) antennas operating either in Sub-6 GHz or antenna array in mm wave are used for receiving and sending many data signals instantaneously over the same radio channel [2][3][4][5][6]. MIMO system is very attractive for future 5G communication.…”

Section: Introductionmentioning

confidence: 99%

“…Circular polarization (CP) reduces both polarization loss and multipath interference, which is needed for high-speed data transmission and reception. In the past, several MIMO antennas were proposed for 5G application [2][3][4][5][6], 5G mobile MIMO antenna with null points of E-field to decouple the different inverted F antenna elements [2], 4-antenna MIMO system based on compact self-decoupled antenna pairs for 5G [3], dual-band MIMO antenna for 5G application [4], and Ground mode tuning (GMT) for the generation of CP [5]. 8-antenna MIMO system without any isolation elements or decoupling techniques were used [6], and a four-port MIMO antenna with a built-in circular-shaped isolator was proposed for Sub-6 GHz applications [7].…”

Section: Introductionmentioning

confidence: 99%

Pattern Diversity Mimo 4g and 5g Wideband Circularly Polarized Antenna With Integrated Lte Band for Mobile Handset

Chaudhary¹,

Kumar²,

Yadav³

2020

PIER M

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The present work describes a unique planar wideband circularly polarized MIMO antenna for 4G and Sub-6 5G band (1.35-2.75 GHz), with pattern diversity over the entire axial-ratio bandwidth. The design consists of two tri-branch planar inverted-F antenna (PIFA) antennas with a ground T-stub between the antennas, which is used to realize circular polarization and high isolation. The third antenna is an integrated Sub-6 5G (4.45-4.7 GHz) and LTE band (786.7-807.7 MHz) antenna, which is folded above the ground and placed vertically around the side. It also provides circular polarization at LTE band. The 3 dB axial ratio bandwidth (ARBW) of the MIMO antenna is 1.08 GHz (1.47-2.55 GHz); impedance matching bandwidth (IMBW) is 1.4 GHz (1.35-2.75 GHz); and its isolation is better than 13.4 dB in the whole band. It is fabricated on an FR-4 substrate and is suitable for mobile handset.

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“…In contrast to the antenna types mentioned above, the ground-radiation antenna (GradiANT) [54][55][56][57][58][59][60][61][62] has attracted considerable attention due to its valued features in compactness, tunability, easy fabrication, low cost, and high radiation performance. It is a loop-type resonator occupying a small clearance, such that it is strongly coupled to the ground plane for radiation.…”

mentioning

confidence: 99%

Isolated Ground-Radiation Antenna With Inherent Decoupling Effect and its Applications in 5G MIMO Antenna Array

Piao

Jin

2020

IEEE Access

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This paper studies an isolated ground-radiation antenna (iGradiANT) that has inherent isolation with another closely-located antenna element and demonstrates its applications in 5G multipleinput multiple-output (MIMO) antenna array. The proposed iGradiANT is accomplished by merely employing a small out-of-ground loop into a traditional ground-radiation antenna (GradiANT). Hence, in contrast to the traditional GradiANT, the proposed iGradiANT can simultaneously support an in-ground loop-type current mode and an out-of-ground loop-type current mode, responsible for far-field radiation and near-field energy cancellation, respectively. In this way, the proposed iGradiANT can exhibit an intrinsic decoupling effect with the adjacent antenna element. Hereby, a typically used inverted-F antenna (IFA) and a normal loop antenna are adopted to separately validate the functionality and versatility of the proposed iGradiANT in establishing 2 × 2 MIMO antenna sets without any separation. Furthermore, an 8 × 8 MIMO antenna array is demonstrated for the usage of 5G terminal devices; both simulation and measurement are conducted to verify its radiation performance and diversity performance. INDEX TERMS Isolated ground-radiation antenna (iGradiANT), inherent isolation, 5G, multiple-input multiple-output (MIMO), terminal devices. I. INTRODUCTION With the explosion of the user number and a burst of powerful cellular devices, there is a tremendous demand for fast data rates. The next-generation communication (5G) is proposed to address this demand by employing the unprecedented spectrum of sub-6 GHz band and millimeter wave (mmWave) band, such that characteristics of ultrafast speeds, low latency, and excellent reliability, can be supported [1, 2]. In the sub-6 GHz layer, the allocation of the 3.5 GHz band (3.4-3.6 GHz) for 5G wireless communication [3] has brought an explosion of groundbreaking research works in multiple-input multiple-output (MIMO) antenna systems for current and future terminal devices [4-32]. It has been proved that the integration of more antenna elements into terminal devices can significantly increase energy efficiency, spectral efficiency, robustness, and reliability, thus satisfying the growing demands of 5G wireless communication.

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Circular Polarized Ground Radiation Antenna for Mobile Applications

Cited by 23 publications

References 25 publications

Slot-Type Mimo Antenna With Pattern and Circular Polarization Diversity for Mobile Applications

Slot-Type Mimo Antenna With Pattern and Circular Polarization Diversity for Mobile Applications

Pattern Diversity Mimo 4g and 5g Wideband Circularly Polarized Antenna With Integrated Lte Band for Mobile Handset

Isolated Ground-Radiation Antenna With Inherent Decoupling Effect and its Applications in 5G MIMO Antenna Array

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