Wide-beam spiral antennas with multi-folded arms and compact feed networks for satellite application

Fartookzadeh, Mahdi; Armaki, S. H. Mohseni

doi:10.1109/iraniancee.2016.7585788

Cited by 5 publications

(12 citation statements)

References 10 publications

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“…This is in fact not a new finding and it has been reflected in several papers such as [6][7][8]. However, the ignorance of this issue in several other papers [9][10][11][12][13][14][15][16][17][18][19][20][21][22] is the motivation of this research to prevent from further errors. Above all, while looking for a wideband microstrip antenna in the recently published papers, I encountered to a significant solution, an octave-bandwidth antenna consisting of two inverted Uslots and two probes [9].…”

Section: Introductionmentioning

confidence: 86%

“…Miniaturised spiral antennas with three folded arms have been proposed in [21] for satellite applications. It is also indicated that the antenna can be design with four or six number of arms in [22]. Furthermore, the effects of changing the heights of these antennas on the radiation patterns are studied in [22].…”

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

confidence: 99%

“…It is also indicated that the antenna can be design with four or six number of arms in [22]. Furthermore, the effects of changing the heights of these antennas on the radiation patterns are studied in [22]. However, the analyses in [21,22] are not complete, since the active -parameters and the realised gain are not reported.…”

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

confidence: 99%

“…Furthermore, the effects of changing the heights of these antennas on the radiation patterns are studied in [22]. However, the analyses in [21,22] are not complete, since the active -parameters and the realised gain are not reported. In this section these parameters are studied and the method of improvement is explained.…”

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

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: Introductionmentioning

confidence: 86%

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

confidence: 99%

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

confidence: 99%

Section: Multi-fed Spiral Antennas With Folded Armsmentioning

confidence: 99%

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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Design of wide‐beam triple‐fed helical antennas employing simple and efficient feed networks for bandwidth improvement

Fartookzadeh

Hossein

Armaki

2018

Micro & Optical Tech Letters

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In this article, a simple method for designing feed networks for wide-beam multi-fed helical antennas, suitable for satellite communications, is studied. Power division with similar phase differences for these antennas is obtained using serial feed network. The number of antenna arms is arbitrary, since the serial feed can be designed for any feasible number of outputs. Triple-fed helical antenna is studied in this article, as an example. The proposed S band triple-fed antenna benefits from 3 dB AR bandwidth of 24%. It has also low-level reflection coefficients throughout the bandwidth. K E Y W O R D S circular polarization, helical antennas, multi-fed antennas, satellite antennas, serial feed AbstractIn this letter, a coupled line type of Wilkinson power divider (PD) composed of series transmission lines and coupled lines is proposed. By employing 2 pairs of transmission lines, the difference between the even-/odd-mode impedance of the utilized coupled line can be controlled; hence the performance of the bandwidth and out-of-band rejection can be changed simultaneously. Detailed design equations are derived and can be easily applied in future works. Due to the inherent bandpass characteristic of the

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

Fartookzadeh

Armaki

2018

IET Microwaves, Antennas & Propagation

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In this study, a new straightforward method for construction of the printed quadrifilar helical antennas is presented. Folded helices with square shapes are used as the arms of the proposed antenna for satellite applications. The proposed structure is consisting of four printed flat walls with similar patterns of arms on each wall. Patterns of the folded arms are printed on four flat substrates with removed ground layers and the antenna structure is obtained by connecting these substrates. Two versions of the proposed antennas are designed for operating at 435 MHz with isolated and connected arms. Both antennas have minor responses at 145 MHz; however the large antenna with connected arms has better results. In addition, the large antenna has wider bandwidth and higher gain at both operating frequencies. Furthermore, the proposed antenna can be used as a wideband antenna with 34% bandwidth.

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Wide-beam spiral antennas with multi-folded arms and compact feed networks for satellite application

Cited by 5 publications

References 10 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

Design of wide‐beam triple‐fed helical antennas employing simple and efficient feed networks for bandwidth improvement

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

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