Compact Dual-Band Printed Quadrifilar Antennas for UHF RFID/GPS Operations

Oh, Kyoung‐Sub; Son, Wang-Ik; Cha, Sungyong; Lee, Moon‐Que; Yu, Jong‐Won

doi:10.1109/lawp.2011.2163610

Cited by 19 publications

(1 citation statement)

References 11 publications

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“…In developing an advance tracking system, RFID and GPS antenna are important technologies as tracking and locator system. In order to achieve that, the new integration design for UHF RFID and GPS was presented in [18].Two types of substrate were needed, TLX-9 substrate and FR-4 substrate and by optimizing printed quadrifilar antennas (PQAs) to operate two different resonant frequencies. The compactness of integration is required to mountable on any product as portable device.…”

Section: Introductionmentioning

confidence: 99%

A Reconfigurable Multiband Antenna for RFID and GPS Applications

Sahar

Islam²,

Misran³

2015

ElAEE

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A C-shaped patches loaded with dipole antenna designed for multiband antenna is proposed. The antenna can be reconfigured as single band at 1.2275 GHz for GPS applications and dual-band frequencies at UHF band (850 MHz-930 MHz) and ISM band (2.41 GHz-2.54 GHz) required in RFID applications. The performance of the antenna involves changing the switches to ON or OFF mode by controlling switches. By adjusting the dimension of C-shaped patch, a dual-band frequency of 0.89 GHz and 2.46 GHz is performed. The antenna's gains are 2 dBi and 3.2 dBi for lower and upper bands respectively. The length slot and length of Cshaped patch can be varied to adjust the desired upper frequency as well as the bandwidth. Moreover, the lower frequency can be tuned by varying the dipole arms for both elements. Nevertheless, the dipole antenna operated as single band when the switches are OFF at frequency resonance is 1.2275 GHz with 2.06 dBi of gain. The total efficiency for single and dual band is greater than 90 %. The design methodology and antenna measurement results are both presented and discussed in this paper. Index Terms-Reconfigurable antenna, dipole, RFID, GPS, ominidirectional.

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Section: Introductionmentioning

confidence: 99%

A Reconfigurable Multiband Antenna for RFID and GPS Applications

Sahar

Islam²,

Misran³

2015

ElAEE

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Multi‐Band Circularly Polarized Antennas

Gao

Luo

Zhu

2013

Circularly Polarized Antennas

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Ground plane impact on quadrifilar helix antenna performance with respect to deployment heights

Ahmad

Khan

Amin³

et al. 2019

Int J Communication

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Quadrifilar helix antenna (QHA) has its applications in satellite communications. This paper presents the performance optimisation of input and radiation characteristics of QHA in the presence of infinite and finite metallic ground planes. For the infinite ground plane, it has been observed that input parameters such as impedance and voltage standing wave ratio (VSWR) are stable, and the antenna has broader half power beamwidth (HPBW). Smaller metallic platforms that act as finite ground planes produce better 3-dB axial ratio beamwidth and boresight axial ratio. Deployment of QHA on smaller metallic platforms such as nanosatellites and CubeSats enhances the circularly polarised beamwidth of the antenna with improved boresight axial ratio. However, on large low earth orbit (LEO) satellites, stable input characteristics and broader HPBW have been achieved at the cost of narrow circularly polarised beamwidth and degraded boresight axial ratio.KEYWORDS helix antenna, satellite antennas, satellite communication, RF measurements, wire antennas, wideband antennas 1 | INTRODUCTION Quadrifilar helix antenna (QHA) has a wide range of applications and is deployed on various space and terrestrial communication platforms. 1-5 It is used for global positioning system (GPS), 5 radio frequency identification (RFID), 6 and low earth orbit (LEO) satellites. 7 In authors' opinion, further study is required on the QHA deployment over terrestrial and satellite platforms.In literature, the effect of ground plane on the QHA radiation characteristics is explained based on two theories: image theory and uniform theory of diffractions. Image theory explains the performance of QHA above large infinite ground planes that is helpful in examining QHA for large platforms. 8 If the ground plane is a perfect electric conductor, it will reflect radiations caused by any antenna installed over it. The image theory assumes that this reflected signal is originated by another antenna placed at the mirror image of the real antenna. This assumption helps to analyse ground reflections as the superposition of two radiation sources. Uniform theory of diffraction (UTD) is applicable to the finite ground plane models to describe the diverging behaviour of QHA from an expected response. 9,10 UTD is derived from the geometrical theory of diffraction (GTD) that has a significant impact on the high frequency computational This work was supported by COMSATS University Islamabad, Lahore Campus, Lahore Pakistan.

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Compact Dual-Band Printed Quadrifilar Antennas for UHF RFID/GPS Operations

Cited by 19 publications

References 11 publications

A Reconfigurable Multiband Antenna for RFID and GPS Applications

A Reconfigurable Multiband Antenna for RFID and GPS Applications

Multi‐Band Circularly Polarized Antennas

Ground plane impact on quadrifilar helix antenna performance with respect to deployment heights

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