Printed quadrifilar square‐helical antennas with folded arms for satellite applications

Fartookzadeh, Mahdi; Armaki, Seyed Hossein Mohseni

doi:10.1049/iet-map.2017.1020

Cited by 4 publications

(7 citation statements)

References 21 publications

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“…Amplitudes of the input signals are the same with 90° out of phase with respect to each other similar to the traditional QHAs. The performances of both antennas at 435 MHz are verified by the measured results in [4]. However, the minor responses at 145 MHz are the concerns that should be more investigated.…”

Section: Miniaturised Qshasmentioning

confidence: 59%

“…Two versions of the QSHAs have been proposed for satellite applications in [4], with the operating frequency of 435 MHz and minor responses at 145 MHz. Arms of the first antenna are isolated, while the second antenna has connected arms as indicated in Fig.…”

Section: Miniaturised Qshasmentioning

confidence: 99%

“…A consequence of mutual coupling effects is the appearance and transfer of maximums and nulls in the radiation pattern [1][2][3]. Although, the effects are usually undesirable for arrays and other applications, they are not always destructive for multi-port antennas, such as wide-beam circularly polarised antennas [4].…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15][16][17][18][19][20]. In this paper, two structures are re-examined; multi-fed spiral antennas with folded arms [21,22] in section 3 and quadrifilar square helical antennas (QSHAs) with folded arms [4] in section 4. It is indicated that the situation is better for these antennas compared with the U-slotted microstrip patch, since the differences between the gain and the realised gain are very less at the operating frequencies.…”

Section: Introductionmentioning

confidence: 99%

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On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

Fartookzadeh¹

2019

Preprint

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In this paper, precise examination of multi-port antennas with large mutual coupling between the ports is studied. For this purpose, some vital parameters such as active reflection coefficients and realised gain are emphasized. The main motivation of this research is the ignorance of this issue in several recently published papers. Hence, corrections and criticisms to some recently reported results are presented. At first, a microstrip patch consisting of two inverted U-slots is re-examined, which has been proposed in a recently published paper for wideband applications. However, the authors did not present satisfactory results to indicate the performance of the proposed structure. In reverse, some important parameters such as the antenna gain appear to be incorrectly reported. In this paper, the characteristics of the antenna are compared with a simple 50 Ω microstrip line excited by two probes, indicating no significant differences. In the remainder of this paper, some corrections are provided on two examples of wide-beam circularly polarised multi-fed antennas for satellite applications. The first example is the multi-fed spiral antennas with folded arms, which have been proposed as the widebeam antennas at 435 MHz. It is indicated that the antenna height should be increased for better performance. The second example is the quadrifilar square helical antennas with folded arms, which have been proposed as the widebeam antennas for 435 MHz with minor responses at 145 MHz. Some corrections are presented on the previously reported minor responses at 145 MHz.

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Section: Miniaturised Qshasmentioning

confidence: 59%

Section: Miniaturised Qshasmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

Fartookzadeh¹

2019

Preprint

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“…Compact wideband and multiband printed quadrifilar helix have been proposed for small satellites. Variations in radiation patterns, reflection coefficients, and gain were studied for these antennas when placed over different size ground planes …”

Section: Introductionmentioning

confidence: 99%

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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Circular feeding network for circular polarisation reconfigurable antennas

Fartookzadeh

Armaki

2019

Electron. lett.

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In this Letter, a symmetric feeding network is proposed for constructing circular polarisation (CP) reconfigurable antennas. The proposed feeding network is based on the sequentially rotated serial feed with three outputs, which has been employed for circularly polarised antennas, extensively. The reconfigurability is obtained by using an additional line and bias circuits. A circular patch antenna is stacked on the proposed feeding network, designed for the frequency band 2-2.3 GHz, to obtain a wideband CP reconfigurable antenna. The performance of the proposed reconfigurable antenna is validated using simulation and measurement results.

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Printed quadrifilar square‐helical antennas with folded arms for satellite applications

Cited by 4 publications

References 21 publications

On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

On the Precise Examination of Multi-Port Antennas; Corrections and Criticisms to Some Recently Reported Results

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

Circular feeding network for circular polarisation reconfigurable antennas

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