A simple and efficient technique to improve the performance of compact circular-polarized slot antenna

Donghee Park, Longyue Qu, Hyeongdong Kim

Research output: Contribution to journalArticle

Abstract

In this letter, a circularly polarized (CP) slot antenna with compact size is proposed for global positioning system (GPS) applications. An annular slot structure is adopted in this design because it inherently has two orthogonal degenerate modes, called one-wavelength modes. Lumped capacitors are utilized so that miniaturized antenna size of 0.26 λ0 × 0.26 λ0 is obtained, but the axial ratio bandwidth (ARBW) is narrow because of high-Q characteristics of the slot modes, providing a rapid change in phase difference near the operating frequency. Accordingly, an additional T-shaped strip is implemented on the ground in the proposed design, which is known as ground-mode tuning technique, to improve the ARBW. The T-shaped strip provides a slower change of the phase difference between the two orthogonal slot modes, efficiently contributing to a greatly improved ARBW. The proposed antenna achieves a 3 dB ARBW of 50 MHz, which is over two times wider than that of the reference antenna. The operation mechanisms of the proposed antenna design are analyzed, and a comparison with typical slot antennas is discussed.

Original languageEnglish
Pages (from-to)852-859
Number of pages8
JournalMicrowave and Optical Technology Letters
Volume62
Issue number2
DOIs
StatePublished - 2020 Feb 1

Fingerprint

slot antennas
Slot antennas
Antennas
Bandwidth
slots
bandwidth
antennas
strip
antenna design
Global Positioning System
Global positioning system
Capacitors
Tuning
Q factors
capacitors
Wavelength
tuning
wavelengths

Keywords

  • annular slot
  • axial ratio bandwidth
  • circular polarization
  • ground-mode tuning
  • slot antenna

Cite this

@article{fd7819f5f6264063b01e67051e69cc3a,
title = "A simple and efficient technique to improve the performance of compact circular-polarized slot antenna",
abstract = "In this letter, a circularly polarized (CP) slot antenna with compact size is proposed for global positioning system (GPS) applications. An annular slot structure is adopted in this design because it inherently has two orthogonal degenerate modes, called one-wavelength modes. Lumped capacitors are utilized so that miniaturized antenna size of 0.26 λ0 × 0.26 λ0 is obtained, but the axial ratio bandwidth (ARBW) is narrow because of high-Q characteristics of the slot modes, providing a rapid change in phase difference near the operating frequency. Accordingly, an additional T-shaped strip is implemented on the ground in the proposed design, which is known as ground-mode tuning technique, to improve the ARBW. The T-shaped strip provides a slower change of the phase difference between the two orthogonal slot modes, efficiently contributing to a greatly improved ARBW. The proposed antenna achieves a 3 dB ARBW of 50 MHz, which is over two times wider than that of the reference antenna. The operation mechanisms of the proposed antenna design are analyzed, and a comparison with typical slot antennas is discussed.",
keywords = "annular slot, axial ratio bandwidth, circular polarization, ground-mode tuning, slot antenna",
author = "Donghee Park and Longyue Qu and Hyeongdong Kim",
year = "2020",
month = "2",
day = "1",
doi = "10.1002/mop.32086",
language = "English",
volume = "62",
pages = "852--859",
journal = "Microwave and Optical Technology Letters",
issn = "0895-2477",
number = "2",

}

A simple and efficient technique to improve the performance of compact circular-polarized slot antenna. / Park, Donghee; Qu, Longyue; Kim, Hyeongdong.

In: Microwave and Optical Technology Letters, Vol. 62, No. 2, 01.02.2020, p. 852-859.

Research output: Contribution to journalArticle

TY - JOUR

T1 - A simple and efficient technique to improve the performance of compact circular-polarized slot antenna

AU - Park, Donghee

AU - Qu, Longyue

AU - Kim, Hyeongdong

PY - 2020/2/1

Y1 - 2020/2/1

N2 - In this letter, a circularly polarized (CP) slot antenna with compact size is proposed for global positioning system (GPS) applications. An annular slot structure is adopted in this design because it inherently has two orthogonal degenerate modes, called one-wavelength modes. Lumped capacitors are utilized so that miniaturized antenna size of 0.26 λ0 × 0.26 λ0 is obtained, but the axial ratio bandwidth (ARBW) is narrow because of high-Q characteristics of the slot modes, providing a rapid change in phase difference near the operating frequency. Accordingly, an additional T-shaped strip is implemented on the ground in the proposed design, which is known as ground-mode tuning technique, to improve the ARBW. The T-shaped strip provides a slower change of the phase difference between the two orthogonal slot modes, efficiently contributing to a greatly improved ARBW. The proposed antenna achieves a 3 dB ARBW of 50 MHz, which is over two times wider than that of the reference antenna. The operation mechanisms of the proposed antenna design are analyzed, and a comparison with typical slot antennas is discussed.

AB - In this letter, a circularly polarized (CP) slot antenna with compact size is proposed for global positioning system (GPS) applications. An annular slot structure is adopted in this design because it inherently has two orthogonal degenerate modes, called one-wavelength modes. Lumped capacitors are utilized so that miniaturized antenna size of 0.26 λ0 × 0.26 λ0 is obtained, but the axial ratio bandwidth (ARBW) is narrow because of high-Q characteristics of the slot modes, providing a rapid change in phase difference near the operating frequency. Accordingly, an additional T-shaped strip is implemented on the ground in the proposed design, which is known as ground-mode tuning technique, to improve the ARBW. The T-shaped strip provides a slower change of the phase difference between the two orthogonal slot modes, efficiently contributing to a greatly improved ARBW. The proposed antenna achieves a 3 dB ARBW of 50 MHz, which is over two times wider than that of the reference antenna. The operation mechanisms of the proposed antenna design are analyzed, and a comparison with typical slot antennas is discussed.

KW - annular slot

KW - axial ratio bandwidth

KW - circular polarization

KW - ground-mode tuning

KW - slot antenna

UR - http://www.scopus.com/inward/record.url?scp=85074303310&partnerID=8YFLogxK

U2 - 10.1002/mop.32086

DO - 10.1002/mop.32086

M3 - Article

AN - SCOPUS:85074303310

VL - 62

SP - 852

EP - 859

JO - Microwave and Optical Technology Letters

JF - Microwave and Optical Technology Letters

SN - 0895-2477

IS - 2

ER -