Multibeam Reflectarrays in Ka-Band for Efficient Antenna Farms Onboard Broadband Communication Satellites

Martinez‐de‐Rioja, Daniel; Martinez‐de‐Rioja, Eduardo; Rodríguez-Vaqueiro, Yolanda; Encinar, José A.; Pino, A.G.

doi:10.3390/s21010207

Cited by 10 publications

(5 citation statements)

References 24 publications

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“…In this way, two of the four colors can be produced by a single multibeam antenna. More details of this application can be found in [5,6,9] and [11][12][13][14] showing different options based in single and dual reflectarray antennas.…”

Section: Numerical Resultsmentioning

confidence: 99%

Bifocal Dual Reflectarray with Curved Main Surface

et al. 2023

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This paper presents a novel approach to synthesizing curved reflectarrays using Geometrical Optics (GO). It introduces the concepts of virtual normal and path length shift, which enable a vector-based formulation of the problem that can be solved using ray tracing techniques. The formulation is applied for the design of two different versions of a Dual Bifocal Reflectarray with a parabolic main surface and a flat subreflectarray. The first version aims to enhance the performance of the multibeam antenna by providing a focal ring located at the feed cluster plane. The second version focuses on improving the scanning characteristics of the antenna in the horizontal plane by incorporating two foci. The synthesis procedure yields samples of the path length shift or its derivatives. To reconstruct the phase distribution, an interpolation scheme is employed and described in this paper. Numerical results are presented for both the focal-ring and two-foci configurations, demonstrating the feasibility of this solution for multibeam or scanning satellite antennas operating in the Ka.

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Section: Numerical Resultsmentioning

confidence: 99%

Bifocal Dual Reflectarray with Curved Main Surface

et al. 2023

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“…This frequency spectrum is considered more productive in transmitting the largest amount of data compared to the Ku-band spectrum so that the spectrum band of this band ranges between (18-30 GHz) as shown in Figure 2. In addition, it has other uses in the fields of military systems and Microwave devices with high-capacity features that require high wavelength and wide transmission of data, as well as it has many uses in radar systems, espionage, defense systems, and others [21].…”

Section: Ka-band Spectrum Frequencymentioning

confidence: 99%

Antennas Performance Comparison of Multi-Bands for Optimal Outdoor and Indoor Environments Wireless Coverage

Muttair

Zahid

Al-Ani

et al. 2021

IJEEI

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This paper aims to implement a wireless Wi-Fi network (Indoor and Outdoor) in order to cover the environment of the Oxford Institute (to learn languages and computer skills) in the best methods and lowest cost in order to provide Wi-Fi service for faculty members and all members of the administrative board and students. The realistic three-floor indoor and outdoor environments of the Institute were designed with Wireless InSite Package (WIP). In addition, emphasis was focus on the use of two types of transmitting devices (Directional and Omni-Directional). The aim of using these two devices is to determine which device is better to cover the Institute's environment well. In this work, a different frequency bands scenario was used to determine which band is suitable for coverage and stability of the wireless network. These bands are S-Band (2.4GHz), C-Band (5GHz), C-Band (10GHz), Ku-Band (15GHz), Ka-Band (28GHz), and MmWave (39GHz). Moreover, the focus has been on the most important basic parameters to determine the performance level of the two devices (Directional and Omni-Directional) as well as to determine the performance level of the wireless network. The most important of these parameters are Path Losses (𝐿 𝑃𝑎𝑡ℎ ), Path Gain (𝐺 𝑃𝑎𝑡ℎ ), Received Signal Strength (RSS), Strongest Received Power, Coverage Ratio (CR), and Received Signal Quality Ratio (RSQR). According to the results that emerged, it was observed that Omni-Directional antennas are much better than Directional antennas, especially in NLOS (None-Line-of-Sight) regions. It was also noted that CR, 𝐿 𝑃𝑎𝑡ℎ , and RSS at S-Band (2.4GHz) are much better than the rest of the bands, so that the CR and the RSQR at this band reach 83.2184% and 95.7383%, respectively. While at the MmWave-Band (39GHz), it reaches 31.0345% and 70.7937% respectively.

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“…In Ref. [ 7 ], multibeam antenna systems are proposed with the aim to provide multispot coverage for broadband satellite communications in the Ka-band. Two multibeam reflectarrays are used, making it possible to halve the number of required antennas onboard the satellite.…”

Section: Summary Of the Special Issuementioning

confidence: 99%