A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones

Rongrong Dong; Yiming Fan; Changjiang Deng; Bin Li

doi:10.1109/RFAT69041.2026.11633896

A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones

Rongrong Dong^*
, Yiming Fan
, Changjiang Deng
, Bin Li

^*Corresponding author for this work

School of Integrated Circuits and Electronics

Beijing Institute of Technology

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

In this paper, a compact and reconfigurable IFA-IFA hybrid antenna for foldable smartphones is presented, utilizing symmetrical metal frames within a limited area. By leveraging the dynamic switching mechanism of the parasitic stub, the antenna achieves adaptive operation across multiple bands. In the B1/B3 bands, the open stub enhances radiation efficiency from about 47% to 53.2% through cooperative resonance. In the B40/B41/N78 bands, shorting the stub improves efficiency from 20-36% to 44-55% by suppressing parasitic coupling. Simulation results demonstrate the antenna achieves good radiation efficiency across all target frequency bands, offering a compact multi-band solution for 5G foldable devices.

Original language	English
Title of host publication	2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	380-382
Number of pages	3
ISBN (Electronic)	9798331572754
DOIs	https://doi.org/10.1109/RFAT69041.2026.11633896
Publication status	Published - 2026
Event	9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026 - Shenzhen, China Duration: 15 May 2026 → 18 May 2026

Publication series

Name	2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026

Conference

Conference	9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026
Country/Territory	China
City	Shenzhen
Period	15/05/26 → 18/05/26

Keywords

Foldable smartphone
multi-band antenna
radiation efficiency
reconfigurable antenna

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10.1109/RFAT69041.2026.11633896

Cite this

Dong, R., Fan, Y., Deng, C., & Li, B. (2026). A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones. In 2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026 (pp. 380-382). (2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/RFAT69041.2026.11633896

Dong, Rongrong ; Fan, Yiming ; Deng, Changjiang et al. / A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones. 2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026. Institute of Electrical and Electronics Engineers Inc., 2026. pp. 380-382 (2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026).

@inproceedings{d933b130ad654ac4b3461ac30d05dbed,

title = "A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones",

abstract = "In this paper, a compact and reconfigurable IFA-IFA hybrid antenna for foldable smartphones is presented, utilizing symmetrical metal frames within a limited area. By leveraging the dynamic switching mechanism of the parasitic stub, the antenna achieves adaptive operation across multiple bands. In the B1/B3 bands, the open stub enhances radiation efficiency from about 47\% to 53.2\% through cooperative resonance. In the B40/B41/N78 bands, shorting the stub improves efficiency from 20-36\% to 44-55\% by suppressing parasitic coupling. Simulation results demonstrate the antenna achieves good radiation efficiency across all target frequency bands, offering a compact multi-band solution for 5G foldable devices.",

keywords = "Foldable smartphone, multi-band antenna, radiation efficiency, reconfigurable antenna",

author = "Rongrong Dong and Yiming Fan and Changjiang Deng and Bin Li",

note = "Publisher Copyright: {\textcopyright} 2026 IEEE.; 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026 ; Conference date: 15-05-2026 Through 18-05-2026",

year = "2026",

doi = "10.1109/RFAT69041.2026.11633896",

language = "English",

series = "2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

pages = "380--382",

booktitle = "2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026",

address = "United States",

}

Dong, R, Fan, Y, Deng, C & Li, B 2026, A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones. in 2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026. 2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026, Institute of Electrical and Electronics Engineers Inc., pp. 380-382, 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026, Shenzhen, China, 15/05/26. https://doi.org/10.1109/RFAT69041.2026.11633896

A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones. / Dong, Rongrong; Fan, Yiming; Deng, Changjiang et al.
2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026. Institute of Electrical and Electronics Engineers Inc., 2026. p. 380-382 (2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Deng, Changjiang

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PY - 2026

Y1 - 2026

N2 - In this paper, a compact and reconfigurable IFA-IFA hybrid antenna for foldable smartphones is presented, utilizing symmetrical metal frames within a limited area. By leveraging the dynamic switching mechanism of the parasitic stub, the antenna achieves adaptive operation across multiple bands. In the B1/B3 bands, the open stub enhances radiation efficiency from about 47% to 53.2% through cooperative resonance. In the B40/B41/N78 bands, shorting the stub improves efficiency from 20-36% to 44-55% by suppressing parasitic coupling. Simulation results demonstrate the antenna achieves good radiation efficiency across all target frequency bands, offering a compact multi-band solution for 5G foldable devices.

AB - In this paper, a compact and reconfigurable IFA-IFA hybrid antenna for foldable smartphones is presented, utilizing symmetrical metal frames within a limited area. By leveraging the dynamic switching mechanism of the parasitic stub, the antenna achieves adaptive operation across multiple bands. In the B1/B3 bands, the open stub enhances radiation efficiency from about 47% to 53.2% through cooperative resonance. In the B40/B41/N78 bands, shorting the stub improves efficiency from 20-36% to 44-55% by suppressing parasitic coupling. Simulation results demonstrate the antenna achieves good radiation efficiency across all target frequency bands, offering a compact multi-band solution for 5G foldable devices.

KW - Foldable smartphone

KW - multi-band antenna

KW - radiation efficiency

KW - reconfigurable antenna

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Dong R, Fan Y, Deng C, Li B. A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones. In 2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026. Institute of Electrical and Electronics Engineers Inc. 2026. p. 380-382. (2026 IEEE 9th International Conference on Radio Frequency and Antenna Technologies, RFAT 2026). doi: 10.1109/RFAT69041.2026.11633896

A Compact Reconfigurable Parasitic Stub-Based IFA-IFA Hybrid Antenna for Foldable Smartphones

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