Design of two-layer printed reflectarrays using patches of variable size

Encinar, José A.

doi:10.1109/8.954929

Cited by 543 publications

(294 citation statements)

References 9 publications

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“…In [7], cross slot rotation technique has been used for multilayer circularly polarized (CP) RA antenna design. The stacked elements in [8] and multilayer coupled resonance elements in [9,10] have been used. Each technique provides some advantages and some tradeoffs, due to multiple factors explained in their work.…”

Section: Introductionmentioning

confidence: 99%

Practical Investigation of Different Possible Textile Unit Cell for a C-Band Portable Textile Reflectarray Using Conductive Thread

Tahseen¹,

Kishk²

2016

PIER B

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Abstract-Investigation of a unit cell in terms of reflected wave amplitude and phase, for designing linearly polarized single layer Textile-Reflectarray (TRA) at C-band, is presented. The relative dielectric constant of the material is extracted using resonance method, and a WLAN antenna is designed to verify the accuracy of extracted material parameter. An error of 5% is observed in the extracted dielectric constant, when performance of WLAN antenna is measured at WI-FI Band (2.4 GHz). The extracted dielectric constant is used in the unit cell designing for TRA at the C-band (5.8 GHz). The radiating element is made using laying technique with conductive thread. A square patch with a ring is selected after analyzing multiple geometries of the patch providing the required reflected phase range and low losses. By varying size of patch and ring of single layer unit cell in CST periodic environment, reflected phase range of 360 degrees is achieved, which is required for reflectarray (RA) designing. The solid copper ground plane at the bottom of unit cell is replaced with conductive shielded fabric with high level signal attenuation. Four different sizes of textile unit cells are fabricated using conductive thread, and the reflected phase and amplitude are measured using waveguide method. The simulated and measured results are compared when solid copper ground plane at the bottom of unit cell has been replaced with shielded fabric. The proposed method provides the first step towards designing flexible high gain textile reflectarrays.

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Section: Introductionmentioning

confidence: 99%

Practical Investigation of Different Possible Textile Unit Cell for a C-Band Portable Textile Reflectarray Using Conductive Thread

Tahseen¹,

Kishk²

2016

PIER B

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“…This is because the frequency slope of RAA cells, dφmn df , is inherently negative [2][3][4][5][6][7][8][9][10][11][12][13][14]. Figure 2 illustrates the required phase-frequency response of the mn-th cell of a wideband RRA with center frequency of f 0 and bandwidth from f l to f u .…”

Section: Phases Of Cells In Wideband Raasmentioning

confidence: 99%

“…So far, several solutions have been proposed to increase the bandwidth of RAAs, such as using a thick substrate, multiple stacked patches [2,3], phase-delay lines [4], aperture-coupled patches to delay lines [5], an artificial impedance surface [6], and true time delay [7]. Almost all the proposed solutions have been based on linearization of the phase variation of the cells with respect to frequency.…”

Section: Introductionmentioning

confidence: 99%

Principles of Ideal Wideband Reflectarray Antennas

Khalaj‐Amirhosseini¹

2017

PIER M

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Abstract-The principles of ideal wideband Rflecarray Antennas (RAAs) are determined through the idea of distortion-less radiation of a modulated pulse. Two conditions for the cells and one condition for the location of the feed are obtained. The conditions are discussed and clarified by some examples. Each cell requires its own phase at center frequency and its own phase derivative in the desired bandwidth. Some relations are obtained and discussed for the range of required phase derivative of the cells.

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“…However, it has a major drawback which is narrow bandwidth operation because the reflection-phase property of each element based on resonance greatly depends on the frequency. To improve the antenna bandwidth in reflectarray, linearization of reflection phase response for the frequency can be realized in some investigation by using thick substrate [5], double square-rings [6], stacked patches [7], multi-resonant elements with low-cross polarization [8], phase-delay lines [9] and so on. We have also reported in [10][11][12][13][14] to improve the bandwidth based on multi-resonant behavior for single-and dual-polarization use.…”

Section: Introductionmentioning

confidence: 99%

Omega-Shaped Geometries of Reflectarray Resonant Elements With Low Cross-Polarization for Wideband and Dual-Polarization Use

Higashi¹,

Deguchi²,

Tsuji³

2018

PIER M

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Abstract-This paper presents low cross-polarization single-layer reflectarray elements for dualpolarization use. These elements have an omega-shaped symmetrical structure to realize the crosspolarization reduction and also provide parallel linear reflection-phase properties with almost the same slop characteristics for the frequency, thereby achieving the desirable reflection phase range more than 360 • over the wide frequency range. To verify effectiveness of the proposed elements, a reflectarray antenna with an offset feed is constructed by them, and wideband frequency characteristics are also confirmed at Ku-band numerically and experimentally.

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Design of two-layer printed reflectarrays using patches of variable size

Cited by 543 publications

References 9 publications

Practical Investigation of Different Possible Textile Unit Cell for a C-Band Portable Textile Reflectarray Using Conductive Thread

Practical Investigation of Different Possible Textile Unit Cell for a C-Band Portable Textile Reflectarray Using Conductive Thread

Principles of Ideal Wideband Reflectarray Antennas

Omega-Shaped Geometries of Reflectarray Resonant Elements With Low Cross-Polarization for Wideband and Dual-Polarization Use

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