A Small Printed Inverted-F Antenna for Circular Polarization

Takafumi FUJIMOTO; Keigo SHIMIZU

doi:10.1587/transcom.2018ISP0005

A Small Printed Inverted-F Antenna for Circular Polarization

Takafumi FUJIMOTO, Keigo SHIMIZU

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In this paper, a printed inverted-F antenna for radiating circularly polarized wave around its resonant frequency is proposed. To get good axial ratio at the frequency band with 10dB-return loss, a rectangular element is loaded at the feeding line perpendicularly. The axial ratio and the frequency giving the minimum axial ratio can be adjusted by the ratio of the length to the width of the whole antenna and by the dimension of the loaded rectangular element. The operational principle for circular polarization is explained using the electric current distributions. Moreover, the approach of the enhancement for the bandwidth is discussed. The simulated and measured bandwidths of the 10dB-return loss with a 3dB-axial ratio are 2.375GHz-2.591GHz (216MHz) and 2.350-2.534GHz (184MHz), respectively. The proposed antenna's dimension is 0.067λ²_c (λ_c is the wavelength at the center frequency). The proposed antenna is compact and planar, and is therefore useful for circular polarization in the ISM band.

Publication: IEICE TRANSACTIONS on Communications Vol.E102-B No.2 pp.197-204

Publication Date: 2019/02/01

Publicized: 2018/08/21

Online ISSN: 1745-1345

DOI: 10.1587/transcom.2018ISP0005

Type of Manuscript: Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2017)

Category: Antennas

Authors

Takafumi FUJIMOTO
Nagasaki University
Keigo SHIMIZU
Nagasaki University

Keyword

printed inverted-F antenna, circular polarization, bandwidth, ISM band

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Takafumi FUJIMOTO, Keigo SHIMIZU, "A Small Printed Inverted-F Antenna for Circular Polarization" in IEICE TRANSACTIONS on Communications, vol. E102-B, no. 2, pp. 197-204, February 2019, doi: 10.1587/transcom.2018ISP0005.
Abstract: In this paper, a printed inverted-F antenna for radiating circularly polarized wave around its resonant frequency is proposed. To get good axial ratio at the frequency band with 10dB-return loss, a rectangular element is loaded at the feeding line perpendicularly. The axial ratio and the frequency giving the minimum axial ratio can be adjusted by the ratio of the length to the width of the whole antenna and by the dimension of the loaded rectangular element. The operational principle for circular polarization is explained using the electric current distributions. Moreover, the approach of the enhancement for the bandwidth is discussed. The simulated and measured bandwidths of the 10dB-return loss with a 3dB-axial ratio are 2.375GHz-2.591GHz (216MHz) and 2.350-2.534GHz (184MHz), respectively. The proposed antenna's dimension is 0.067λ²_c (λ_c is the wavelength at the center frequency). The proposed antenna is compact and planar, and is therefore useful for circular polarization in the ISM band.
URL: https://global.ieice.org/en_transactions/communications/10.1587/transcom.2018ISP0005/_p

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@ARTICLE{e102-b_2_197,
author={Takafumi FUJIMOTO, Keigo SHIMIZU, },
journal={IEICE TRANSACTIONS on Communications},
title={A Small Printed Inverted-F Antenna for Circular Polarization},
year={2019},
volume={E102-B},
number={2},
pages={197-204},
abstract={In this paper, a printed inverted-F antenna for radiating circularly polarized wave around its resonant frequency is proposed. To get good axial ratio at the frequency band with 10dB-return loss, a rectangular element is loaded at the feeding line perpendicularly. The axial ratio and the frequency giving the minimum axial ratio can be adjusted by the ratio of the length to the width of the whole antenna and by the dimension of the loaded rectangular element. The operational principle for circular polarization is explained using the electric current distributions. Moreover, the approach of the enhancement for the bandwidth is discussed. The simulated and measured bandwidths of the 10dB-return loss with a 3dB-axial ratio are 2.375GHz-2.591GHz (216MHz) and 2.350-2.534GHz (184MHz), respectively. The proposed antenna's dimension is 0.067λ²_c (λ_c is the wavelength at the center frequency). The proposed antenna is compact and planar, and is therefore useful for circular polarization in the ISM band.},
keywords={},
doi={10.1587/transcom.2018ISP0005},
ISSN={1745-1345},
month={February},}

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TY - JOUR
TI - A Small Printed Inverted-F Antenna for Circular Polarization
T2 - IEICE TRANSACTIONS on Communications
SP - 197
EP - 204
AU - Takafumi FUJIMOTO
AU - Keigo SHIMIZU
PY - 2019
DO - 10.1587/transcom.2018ISP0005
JO - IEICE TRANSACTIONS on Communications
SN - 1745-1345
VL - E102-B
IS - 2
JA - IEICE TRANSACTIONS on Communications
Y1 - February 2019
AB - In this paper, a printed inverted-F antenna for radiating circularly polarized wave around its resonant frequency is proposed. To get good axial ratio at the frequency band with 10dB-return loss, a rectangular element is loaded at the feeding line perpendicularly. The axial ratio and the frequency giving the minimum axial ratio can be adjusted by the ratio of the length to the width of the whole antenna and by the dimension of the loaded rectangular element. The operational principle for circular polarization is explained using the electric current distributions. Moreover, the approach of the enhancement for the bandwidth is discussed. The simulated and measured bandwidths of the 10dB-return loss with a 3dB-axial ratio are 2.375GHz-2.591GHz (216MHz) and 2.350-2.534GHz (184MHz), respectively. The proposed antenna's dimension is 0.067λ²_c (λ_c is the wavelength at the center frequency). The proposed antenna is compact and planar, and is therefore useful for circular polarization in the ISM band.
ER -