The effect of feed position on the performance of a broadband reflectarray

Mohammadirad, Mohammad; Komjani, Nader; Chaharmir, M.R.; Shaker, J.; Sebak, Abdel-Razik

doi:10.1109/aps.2011.5996650

Cited by 2 publications

(5 citation statements)

References 9 publications

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“…8(a) and (b) shows the measured radiation patterns for different feed positions at 10 and 15 GHz, respectively. Comparing the measured gain for different feed locations demonstrates that moving the horn toward the reflectarray leads to gain variation in the order of 2 dB and well-collimated beams at lower frequencies (10)(11)(12). In other words, as it can be seen for reduced feed-reflectarray distance (33 cm) that the radiation pattern at higher frequencies is degraded.…”

Section: Measurement Resultsmentioning

confidence: 89%

“…The aim of this letter is to show the possibility of changing the operating band by judicious placement of the feed along the focal axis of a broadband reflectarray through simulation and measurement. To demonstrate this, a broadband cell element that has already been introduced by the authors for Ku-band [11] is used to design and fabricate a moderate size wideband reflectarray at X-Ku band. It should be mentioned that the proposed unit cell is different from the one in [8], as discussed in Section II.…”

Section: Impact Of Feedmentioning

confidence: 99%

“…Note that linearizing and increasing the phase range at a single frequency does not necessarily guarantee the same across the band. However, an extensive optimization was done to improve the linear phase response of the element and enhance the bandwidth of the reflectarray [11]. The suggested reflectarray element, shown in of three rectangular loops etched on RT/duroid 5880 substrate with thickness of mm.…”

Section: Cell Element Structure and Reflectarray Designmentioning

confidence: 99%

“…To gain a better insight on the effect of feed position on bandwidth performance of reflectarray, the method introduced in [7] and [11] is used to calculate the near-field intensity along predefined lines in CST. In this simulation, the feed horn is removed and the reflectarray is illuminated by an oblique incident plane wave that is actually along the direction of the main beam of the reflectarray.…”

Section: Study Of the Impact Of Feed Location On Reflectarray Pementioning

confidence: 99%

See 3 more Smart Citations

Impact of Feed Position on the Operating Band of Broadband Reflectarray Antenna

Mohammadirad

Komjani

Chaharmir

et al. 2012

Antennas Wirel. Propag. Lett.

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In this letter, the effect of moving the feed on the operation bandwidth of a broadband reflectarray is investigated through simulation and measurement. A new broadband cell element with optimized dimensions to achieve linear phase shift is proposed in this investigation. A square reflectarray of 40 40 cm comprising this particular unit cell was designed and fabricated to demonstrate wideband operation at X-Ku band. The effect of feed movement on the operating band was studied by exciting the reflectarray with a plane wave and monitoring the near field on the line passing through the assumed feed locations over a wide frequency band. Considering three different feed positions, the reflectarray was simulated, and good agreement between simulated and measured results was observed. It is shown that changing the feed location leads to a considerable shift in operating frequency window of the reflectarray and also its maximum gain, which gives rise to the possibility of changing the operating band without redesigning the reflectarray by only moving the feed. Moreover, a remarkable value of 36% of 1.5 dB gain-bandwidth was measured, which is higher compared to previously reported designs in the literature.Index Terms-Broadband reflectarray, cell element, focal shift, gain-bandwidth.

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Section: Measurement Resultsmentioning

confidence: 89%

Section: Impact Of Feedmentioning

confidence: 99%

Section: Cell Element Structure and Reflectarray Designmentioning

confidence: 99%

Section: Study Of the Impact Of Feed Location On Reflectarray Pementioning

confidence: 99%

See 2 more Smart Citations

Impact of Feed Position on the Operating Band of Broadband Reflectarray Antenna

Mohammadirad

Komjani

Chaharmir

et al. 2012

Antennas Wirel. Propag. Lett.

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show abstract

“…Different approaches have been introduced and employed to enhance the bandwidth of the reflectarray antennas. These include implementation using a multilayer substrate with stacked resonance elements [8, 9], single layer with multi‐resonance elements [10–14], reflectarray with sub‐wavelength unit cells [15–19] and multi‐layer structure with sub‐wavelength elements [20]. However, stacking reflectarray elements in the multilayer substrate need complex fabrication processes which often lead to higher cost.…”

Section: Introductionmentioning

confidence: 99%

Reflectarray antenna based on grounded loop‐wire miniaturised‐element frequency selective surfaces

Edalati

Sarabandi

2014

IET Microwaves, Antennas & Propagation

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A reflectarray antenna based on a metal‐backed co‐planar loop‐wire Miniaturized Element Frequency Selective Surface (MEFSS) is presented in this paper. Since the unit cells are small compared to the wavelength, an equivalent lumped‐element model can describe the spectral behaviour of the proposed MEFSS structure. It is shown that the proposed unit cell provides a wider and gentler phase variation as a function of the loop size compared to a metallic patch or loop element and that the phase response of the loop‐wire element has very low sensitivity to the angle of incidence. In addition, the response of the unit cell, to a great extent, depends on the geometric and electrical parameters of the cells themselves with minimum dependency on the neighbouring elements and therefore the reflected signal phase can be controlled locally. Three samples of the proposed MEFSS structure, each giving different reflection phase values, are fabricated and measured to validate the circuit model and the design procedure. A prototype MEFSS‐based reflectarray antenna at X‐band is fabricated and measured. The prototype (260 mm × 260 mm and F/D = 1.02) shows a maximum gain of 26.3 dBi with a 1 dB‐gain bandwidth of 17% and 3‐dB beamwidth of 6° in agreement with the design parameters.

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The effect of feed position on the performance of a broadband reflectarray

Cited by 2 publications

References 9 publications

Impact of Feed Position on the Operating Band of Broadband Reflectarray Antenna

Impact of Feed Position on the Operating Band of Broadband Reflectarray Antenna

Reflectarray antenna based on grounded loop‐wire miniaturised‐element frequency selective surfaces

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