Compact Two-Inverted-F-Antenna System With Highly Integrated $\pi$  -Shaped Decoupling Structure

Su, Saou‐Wen; Lee, Cheng‐Tse; Hsiao, Ya-Wen

doi:10.1109/tap.2019.2925286

Cited by 46 publications

(36 citation statements)

References 8 publications

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“…The measured isolation over the 3.3–5.0 GHz band exceeds 13 dB with antenna efficiency in the NR bands 77/78 and 79 larger than 44% and 64% for Ant1 and 41% and 60% for Ant2. Finally, a comparison table of the cited work 9‐20 is provided in Table 1. It is seen that the proposed design shows a low profile of 5 mm with no separation and offers wideband operation.…”

Section: Resultsmentioning

confidence: 99%

“…For port1 excitation in the experiments, the counterpart port2 was TABL E 1 Comparison of the MIMO antennas. [9][10][11][12][13][14][15][16][17][18][19][20] Isolation is obtained from the worst case (largest value) for all the bands between the connected to a 50-Ω load. The same setup was applied to the port2 measurement.…”

Section: Decoupling Analysesmentioning

confidence: 99%

“…The conventional decoupling technique in practice is to design some decoupling structure to provide extra coupling path between the antennas as in References 9‐11. In recent studies, no use of the additional decoupling structure 12‐17 has been reported for further size reduction.…”

Section: Introductionmentioning

confidence: 99%

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Decoupled multi‐input multi‐output antennas with a common dipole for wideband 5G laptop computers

Lee

2020

Micro & Optical Tech Letters

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Two decoupled antennas, comprising two feeding monopoles and one dipole shared by the monopoles, for the fifth‐generation (5G) multi‐input multi‐output (MIMO) applications are proposed. The feeding monopoles are placed on both sides of the coupled‐fed, common dipole. First, to operate in the 3.3–5.0 GHz 5G wideband, two resonant modes at about 3.6 and 4.7 GHz, contributed to by the common dipole and the feeding monopoles respectively, are utilized. Then, by introducing distributed capacitance loaded on the dipole center, the one‐wavelength dipole resonant mode can be lowered to oppose the counter‐phased half‐wavelength mode currents on the half dipole, resulting in self decoupling around 3.6 GHz. The mutual coupling for the common dipole is reduced by about 19 dB in this study. The design shows a small size of 35 mm × 5 mm (0.38‐wavelength × 0.05‐wavelength at 3.3 GHz) and can be a promising candidate for narrow‐bezel 5G laptop computers.

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Section: Resultsmentioning

confidence: 99%

Section: Decoupling Analysesmentioning

confidence: 99%

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Decoupled multi‐input multi‐output antennas with a common dipole for wideband 5G laptop computers

Lee

2020

Micro & Optical Tech Letters

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“…To improve antenna port-to-port isolation, one popular decoupling technique in common practice is to introduce additional coupling path against the original antenna coupling by inserting grounded resonator structures between the antennas as in [4][5][6][7][8][9]. The decoupling structures include the uses of the meandered strip resonator [4], the T-shaped open slot in the protruded ground [5], the T-shaped decoupling structure [6], the combination of the meandered strip and the T-shaped open slot [7], the same radiator as the decoupling structure [8], and the integrated π-shaped decoupling strip [9]. A different decoupling technique that uses an inductor connecting the open ends of the shorted monopoles is also reported for notebook applications [10].…”

Section: Introductionmentioning

confidence: 99%

“…Good decoupling between the antennas is thereby attained. A comparison table for the previous work in [4][5][6][7][8][9][10][11][12] is provided. From Table 1, it can be seen that the proposed design shows a low profile of 5 mm with no separation between antennas and yet offers minimum isolation > 16 dB for every band.…”

Section: Introductionmentioning

confidence: 99%

Conjoined, 2.4/5-GHZ Wlan Two-Monopole System Decoupled Using Mode-Controlled Capacitor for Notebook Computers

Wan¹,

Su²

2019

PIER M

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A low-profile, decoupled two-monopole system with its two parasitic grounded strips conjoined, forming a very compact structure is demonstrated. Each of the two identical antennas comprises a driven coupling strip and a parasitic grounded strip, operating respectively in the 2.4 GHz (2400-2484 MHz) and 5 GHz (5150-5825 MHz) wireless local area network (WLAN) bands. The two parasitic strips are further joined together, becoming a central, grounded T monopole. By loading a capacitor between the T monopole and the antenna ground, the mutual coupling in the 2.4 GHz band can be reduced by about 12 dB. The capacitor in this design is used to control Ant2 monopole mode to cancel out opposite-phased currents of the dipole mode on the T monopole when Ant1 is excited, such that isolation enhancement can be attained. The proposed two-monopole system occupies a compact size of 5 mm × 40 mm (about 0.04λ × 0.32λ at 2.4 GHz) and is favorable for applications in the narrowbezel notebook computers owing to its low profile of 5 mm.

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Accelerated parameter tuning of antenna structures using inverse and feature‐based forward kriging surrogates

Koziel

Pietrenko‐Dabrowska

Al‐Hasan

2021

Int J Numerical Modelling

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Tuning of geometry parameters is one of the essential stages of contemporary antenna design. It is necessary because available design methods, whether based on theoretical considerations or on engineering experience, are only capable of yielding initial designs that need further adjustment in order to boost the performance parameters as much as possible. Numerical optimization is also imperative for antenna re‐design with respect to different operating conditions (e.g., center frequency) or material parameters (e.g., substrate permittivity/thickness). As the tuning process normally involves full‐wave electromagnetic (EM) analysis, it may incur considerable computational expenses. Reducing these costs is highly desirable from the perspective of both academic research and industry. This paper proposes a simple surrogate‐assisted framework for accelerated antenna parameter tuning that allows for reusing the previously acquired design data. The first (inverse) surrogate serves as a reliable predictor for generating a reasonable initial design, whereas the second (forward) model encodes antenna sensitivities at the level of so‐called response features. The involvement of the response feature technology leads to a more accurate rendition of the antenna gradients, which speeds up the design refinement as compared to the forward model constructed at the level of original antenna characteristics. Our methodology is demonstrated using two microstrip antennas and compared to the previously reported warm‐start optimization procedures.

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Compact Two-Inverted-F-Antenna System With Highly Integrated $\pi$ -Shaped Decoupling Structure

Cited by 46 publications

References 8 publications

Decoupled multi‐input multi‐output antennas with a common dipole for wideband 5G laptop computers

Decoupled multi‐input multi‐output antennas with a common dipole for wideband 5G laptop computers

Conjoined, 2.4/5-GHZ Wlan Two-Monopole System Decoupled Using Mode-Controlled Capacitor for Notebook Computers

Accelerated parameter tuning of antenna structures using inverse and feature‐based forward kriging surrogates

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