Mars Cube One

Decrossas, Emmanuel; Kobayashi, M. Michael

doi:10.1002/9781119692720.ch2

Cited by 7 publications

(5 citation statements)

References 21 publications

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“…The required linear phase-shift correction is derived from an NF-to-FF transformation of the complex near field and by observing the scanning direction of the resulting far-field beam. 2 Note that such correction does not change the shape or quality of the beam patterns but merely centers the pattern at a broadside direction. Any pattern degradation due to coma phase contributions, as a result of feed misalignment with respect to the lens focus, is still preserved in the corrected measurements.…”

Section: B Lens Antenna Measurementsmentioning

confidence: 99%

“…The integration of a limb-sounding heterodyne THz spectrometer on an ultrasmall platform, such as a CubeSat or SmallSat, would provide an accessible and low-cost pathway to interplanetary space science. CubeSat instruments already have proven to be very successful at microwave frequencies, for the purpose of deep-space communications (Mars Cube One [2]) or low-earthorbit (LEO) weather radar (RainCube [3]). Unfortunately, the heavy restrictions on volume (as small as 1U 1 ) and mass (as light as 1.3 kg) make the design of the antenna front end very challenging [4].…”

mentioning

confidence: 99%

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An $f/0.27$ High-Gain Lens Antenna for Ultrasmall Platforms at THz Frequencies

Berkel

Alonso‐delPino

Jung-Kubiak

et al. 2023

IEEE Trans. THz Sci. Technol.

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The development of a low focal number and low-mass lens antenna is presented that enables terahertz spectroscopy applications on ultracompact platforms. The antenna operates efficiently over a 20% fractional bandwidth, from 450 to 550 GHz, with a gain of 50 dBi at 500 GHz. The antenna consists of a hyperbolic silicon lens that is placed in a record low focal number configuration (f # = 0.27) with respect to an advanced waveguide feed. An incident field-matching analysis is applied to investigate the optimal feed radiation pattern that maximizes the lens aperture efficiency, which would result in a 20% increase in aperture efficiency (>80%) with respect to a standard open-ended waveguide (<60% aperture efficiency). A multilayer leaky-wave (LW) stratification is quasianalytically optimized to approximate the optimal feeding pattern, resulting in a > 70% lens aperture efficiency. An example LW stratification is synthesized using silicon micromachining technology and is fully characterized in combination with the dielectric lens.

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Section: B Lens Antenna Measurementsmentioning

confidence: 99%

mentioning

confidence: 99%

An $f/0.27$ High-Gain Lens Antenna for Ultrasmall Platforms at THz Frequencies

Berkel

Alonso‐delPino

Jung-Kubiak

et al. 2023

IEEE Trans. THz Sci. Technol.

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“…CubeSats, a subset of satellites deployed in various orbits, are miniaturized satellites offering several distinct advantages over traditional satellite designs [1]. Beyond the evident benefits such as reduced costs, expedited development times, ease of launch, and standardization, CubeSats are particularly attractive due to their compact size.…”

Section: Introductionmentioning

confidence: 99%

Multibeam Beamforming for Direct Radiating Arrays in Satellite Communications Using Genetic Algorithm

Andrés Vásquez-Peralvo,

Querol,

Ortíz

et al. 2024

IEEE Open J. Commun. Soc.

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Recent advancements in onboard satellite communication have enhanced the capability of dynamically modifying the radiation pattern of a Direct Radiating Array (DRA). This is crucial not only for conventional communication satellites like Geostationary Orbit (GEO) but also for those in lower orbits such as Low Earth Orbit (LEO). Key design factors include the number of beams, beamwidth, Effective Isotropic Radiated Power (EIRP), and Side Lobe Level (SLL) for each beam. However, a challenge arises in multibeam scenarios when trying to simultaneously meet requirements for the aforementioned design factors which are reflected as uneven power distribution. This leads to over-saturation, especially in centrally located antenna elements due to the activation times per beam, commonly referred to as activation instances. In response to this challenge, this paper presents a method to balance the activation instances across antenna elements for each required beam. Our focus is on beams operating at 19 GHz on a CubeSat positioned 500 km above the Earth's surface. We introduce a Genetic Algorithm (GA)-based algorithm to optimize the beamforming coefficients by modulating the amplitude component of the weight matrix for each antenna element. A key constraint of this algorithm is a limit on activation instances per element, which avoids over-saturation in the Radio Frequency (RF) chain. Additionally, the algorithm accommodates beam requirements such as beamwidth, SLL, pointing direction, and total available power. With the previous key design factors, the algorithm will optimize the required genes to address the desired beam characteristics and constraints. We tested the algorithm's effectiveness in three scenarios using an 8×8 DRA patch antenna with circular polarization, arranged in a triangular lattice. The results demonstrate that our algorithm not only meets the required beam pattern specifications but also ensures a uniform activation distribution across the antenna array.INDEX TERMS Antennas, beamforming, direct radiating array, satellite communications.

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“…Critical issues involve the deployment and integration of such antennas. Mesh reflector, transmitarray, reflectarray, membrane, inflatable, and metasurface antennas are a few of the high gain antennas recently developed for CubeSats [4], [5], [6]. The payload capabilities of smaller CubeSats (below 2U in size, like 1U) are now also increasing, and in the future, we will see important missions being accomplished by this category of satellites.…”

Section: Introductionmentioning

confidence: 99%

Compact Dual Slot SIW Cavity Backed Antenna for CubeSat/Nanosatellite Applications

Abegaonkar

Basu

2023

IEEE Access

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In this article, a small aperture coupled SIW cavity-backed dual slot antenna is presented. It is demonstrated that, for a rectangular SIW cavity with dual slot, when the feed point is chosen properly, the structure can resonate at much lower frequency than that of the conventional SIW cavity mode frequency. An equivalent cavity model is formed; a formula for the calculating the operating frequency and a general design guideline are provided for this structure. The designed prototype antenna provides a gain of 8.41 dBi at 15 GHz. For high-gain applications, a 2 × 4 array of such element is demonstrated. An experimental validation of the array results in a gain of 16.01 dBi. The structure is compact, offers a broadside radiation pattern, easy to integrate with metallic surface, and has inherent property of reducing mutual coupling. As a result, it can find application in CubeSat/SmallSats where space is among the major constraints and components are very closely packed. It can be used in CubeSat missions for earth and planetary observations, intersatellite communications, and in MIMO systems for SmallSat swarms.INDEX TERMS Compact antennas, CubeSats, high gain, substrate integrated waveguide (SIW), slot antenna.

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Mars Cube One

Cited by 7 publications

References 21 publications

An $f/0.27$ High-Gain Lens Antenna for Ultrasmall Platforms at THz Frequencies

An $f/0.27$ High-Gain Lens Antenna for Ultrasmall Platforms at THz Frequencies

Multibeam Beamforming for Direct Radiating Arrays in Satellite Communications Using Genetic Algorithm

Compact Dual Slot SIW Cavity Backed Antenna for CubeSat/Nanosatellite Applications

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