Decoupler Design for Mimo Antennas of Usb Dongle Applications Using Ground Mode Coupling Analysis

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

doi:10.2528/pierm18092604

Cited by 4 publications

(6 citation statements)

References 45 publications

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“…The performance of the antenna has been compared with the literature of Wi-Fi antennas in Table 2. It is evident from the table that the performance of the proposed antenna is better than [26][27][28]. However, the isolation performance is lower in comparison with [10], [13], and [14].…”

Section: Measured Resultsmentioning

confidence: 90%

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A wideband decoupling method using bezel-coupled loop-type isolator for smartwatch MIMO applications

Baloch

Zahid

et al. 2022

Int. J. Microw. Wireless Technol.

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This paper presents a novel decoupling technique for two-element multiple-in multiple-out (MIMO) antennas for smartwatch applications with floating metallic bezel. The radiating elements consist of embedded loop-type ground-radiation antennas and operate at the 2.45 GHz Bluetooth/Wi-Fi bands. An isolator, consisting of a loop-type structure with a lumped capacitor, is attached externally to the ground plane such that wideband isolation between the antennas has been achieved. It is demonstrated that the small-sized isolator is coupled with the large-sized bezel surrounding the ground plane, where the bezel operates as a low-Q decoupler between the antenna elements producing wideband isolation property. Accordingly, optimized results can be obtained by controlling the location of the isolator, the gap between the isolator and the bezel, and the loaded capacitor. Simulation and measured results have been presented to validate the design performance. The measured −10 dB impedance bandwidth of both antenna elements is more than 210 MHz, whereas the isolation bandwidth is 770 MHz with reference to 20 dB. The envelop correlation coefficient is <0.1 in the operating band. Furthermore, the proposed technique is versatile regardless of the angular separation of the antenna elements on the circular ground plane, which makes it a good candidate for smartwatch MIMO applications in practical scenarios.

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Section: Measured Resultsmentioning

confidence: 90%

“…The theory has been utilized in the design of highefficiency antennas in various articles [23][24][25]. Although various GradiAnt-based MIMO antennas have been studied for mobile applications [26][27][28], the designs suffer from narrowband isolation or a large footprint, which cannot fit the smartwatch scenarios.…”

Section: Introductionmentioning

confidence: 99%

A wideband decoupling method using bezel-coupled loop-type isolator for smartwatch MIMO applications

Baloch

Zahid

et al. 2022

Int. J. Microw. Wireless Technol.

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“…[18][19][20] However, narrow isolation bandwidth has been a major drawback in GradiAnt-based MIMO antennas proposed in Qu and colleagues. [21][22][23] Many bandwidth enhancement techniques have been reported in the literature that can be employed to enhance the bandwidth of the PIFA antenna. 24,25 However, the techniques focused on isolation bandwidth enhancement need further investigation.…”

Section: Introductionmentioning

confidence: 99%

“…Ground radiation antenna (GradiAnt) is a coplanar antenna suitable for mobile device operation 18–20 . However, narrow isolation bandwidth has been a major drawback in GradiAnt‐based MIMO antennas proposed in Qu and colleagues 21–23 . Many bandwidth enhancement techniques have been reported in the literature that can be employed to enhance the bandwidth of the PIFA antenna 24,25 .…”

Section: Introductionmentioning

confidence: 99%

A wideband isolation technique using bezel coupled T‐type isolator for smartwatch MIMO applications

Baloch

Zahid

et al. 2022

Micro & Optical Tech Letters

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This letter presents a wideband bezel coupled T‐type isolator, decoupling two antenna elements for smartwatch multiple‐input multiple‐out applications. The antenna elements consist of PIFA antennas operating at 2.45 GHz, covering Bluetooth and Wi‐Fi bands. The proposed T‐type isolator has been installed between the antenna elements made by inserting two slits in the bezel separated by 21 mm. The separated segment of the bezel is connected with the circular ground plane by a conducting strip and an inductor. In this way, the slits offer stray capacitance, and the capacitive coupling between the T‐type isolator has been utilized to achieve a wide isolation bandwidth. Meanwhile, the isolation can also be tuned using the gaps of the slits and the inductor. The design performance has been validated in simulations and measurement. The measured impedance bandwidth is higher than 120 MHz whereas the isolation bandwidth is 790 MHz with a maximum isolation higher than 22 dB. The measured envelop correlation coefficient is below 0.01. The proposed design is a good candidate for smartwatch applications.

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“…The coupling degrades the diversity performance [2] that can be controlled using a decoupling structure. Several decoupling structures have been proposed for reducing the mutual coupling between MIMO antennas of mobile devices, such as decoupling and matching networks [3,4], electromagnetic band-gap structures [5], split ring resonators [6], neutralization lines [7], parasitic elements [8,9], Tshaped slot, and defected ground structures [10]. The additional decoupling structure is an obstacle to maintain the low profile of the antenna system.…”

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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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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Decoupler Design for Mimo Antennas of Usb Dongle Applications Using Ground Mode Coupling Analysis

Cited by 4 publications

References 45 publications

A wideband decoupling method using bezel-coupled loop-type isolator for smartwatch MIMO applications

A wideband decoupling method using bezel-coupled loop-type isolator for smartwatch MIMO applications

A wideband isolation technique using bezel coupled T‐type isolator for smartwatch MIMO applications

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

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