Phase error analysis of the effect of feed movement on bandwidth performance of a broadband X-Ku band reflectarray

Mohammadirad, Mohammad; Komjani, Nader; Chaharmir, M.R.; Shaker, J.; Sebak, A.

doi:10.1002/mmce.20685

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…The most important drawback of this type of antennas is their narrow bandwidth. Recently, many efforts have been accomplished to improve the bandwidth of reflectarray antenna (RA) [1][2].…”

Section: Introductionmentioning

confidence: 99%

A Single-Layer Broadband Reflectarray Antenna by Using Quasi-spiral Phase Delay Line

Derafshi

Komjani

Mohammadirad

2015

Antennas Wirel. Propag. Lett.

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A novel broadband unit-cell is proposed in this paper. This new cell element consists of three coupled circular rings where four quasi-spiral delay lines are connected to the outer ring to provide the required phase shift. The spiral shape of the delay lines exhibits more than 1000 o of phase swing. The cross polarization level of the presented element is considerably improved compared to previous designs with a similar phasing mechanism. The capability of operating in linearly or circularly polarized incident wave is an important advantage of the proposed cell. In other words, depending on polarization of the feed antenna, the present reflectarray can operate in vertical, horizontal or circular polarization. Finally a moderate size reflectarray, 27×27 cm 2 , is designed and fabricated based on the mentioned element. The measured results showed about 16.5% of 1 dB gain bandwidth. The antenna gain at 8.5 GHz is 26.4 dB which is equivalent to 59.2% efficiency. Also, the measured sidelobe level and cross polarization of this antenna are about -20 dB and -25 dB, respectively.Index Terms-Quasi-spiral phase delay line, phase shift mechanism, reflectarray antenna, delay line.

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“…The most important drawback of this type of antennas is their narrow bandwidth. Recently, many efforts have been accomplished to improve the bandwidth of reflectarray antenna (RA) [1][2].…”

Section: Introductionmentioning

confidence: 99%

A Single-Layer Broadband Reflectarray Antenna by Using Quasi-spiral Phase Delay Line

Derafshi

Komjani

Mohammadirad

2015

Antennas Wirel. Propag. Lett.

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“…3(a)). The main effect of 2 mm spacer is to reduce the coupling between the elements on top (radiating) and bottom (FSS) layers and thus increasing the bandwidth of the RA [15]. Final dimension of the unit cell is 9 mm×9 mm.…”

Section: A Design Of Ku Band Elementmentioning

confidence: 99%

Dual-band X/Ku Reflectarray Antenna Using a Novel FSS-Backed Unit-Cell with Quasi-Spiral Phase Delay Line

Derafshi

Komjani

Ghasemi-Mizuji

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

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“…Bandwidth limitation of radiation elements and differential spatial phase delay (in large RAs) are two important factors of this drawback. Several possible solutions are reported to overcome the narrow‐band behavior of small and moderate size RAs such as tuning the feed position with respect to the aperture, using broadband element including two and three layers of varying‐size patches, stacked patch, aperture couple patches, and double square meander‐line rings . In general, the use of multilayer patches for bandwidth enhancement has more complex manufacturing process in compare of single layer configurations.…”

Section: Introductionmentioning

confidence: 99%

Optimum design of dual band shaped-beam circularly polarized reflectarray antenna based on physical optic method

Karimipour

Komjani

Abdolali

et al. 2016

Int J RF and Microwave Comp Aid Eng

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A shaped‐beam dual‐band reflectarray (RA) with shared aperture is designed and simulated in this communication. Desired radiation patterns are considered squared cosecant and pencil beam in elevation and azimuth planes for both bands, respectively. This antenna has been designed to operate at X‐Band (9.6–10.9 GHz) with left‐hand circular polarization and K‐Band (19.1–21.6 GHz) with right‐hand circular polarization. A thin layer of Frequency Selective Surface is used as a band separator to reduce mutual coupling between two frequency bands. A cross dipole with variable arc‐shape delay line, which has very low cross polarization, is used as the radiation element for both bands. The capability of operating in different polarizations is an advantage of the proposed element. To obtain shaped‐beam pattern for both bands, an optimization method based on physical optic is adopted. In the synthesis method, far‐field radiation patterns are evaluated as a function of the tangential electric field components on the reflecting surface. Lower and higher band RAs are implemented on 30 × 30 cm2 and 18 × 18 cm2 Rogers 4003 substrate, respectively. Finally, the whole structure is simulated with CST software and shows a good agreement between the simulation and the ideal patterns at two bands. © 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:690–702, 2016.

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Phase error analysis of the effect of feed movement on bandwidth performance of a broadband X-Ku band reflectarray

Cited by 7 publications

References 16 publications

A Single-Layer Broadband Reflectarray Antenna by Using Quasi-spiral Phase Delay Line

A Single-Layer Broadband Reflectarray Antenna by Using Quasi-spiral Phase Delay Line

Dual-band X/Ku Reflectarray Antenna Using a Novel FSS-Backed Unit-Cell with Quasi-Spiral Phase Delay Line

Optimum design of dual band shaped-beam circularly polarized reflectarray antenna based on physical optic method

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