Dual-Band Self-Diplexed Modulated Metasurface Antennas

Faenzi, Marco; Ovejero, David González; Caminita, F.; Maci, S.

doi:10.1049/cp.2018.0842

Cited by 13 publications

(9 citation statements)

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“…(46)), i.e. The entire process actually depends on the angular frequency ω0, at which we impose the profile of the power density given by (31). The value of ω0 is a reference angular frequency between the maximum and minimum angular frequencies of the bandwidth.…”

Section: B Amplitude Modulation As a Function Of Frequencymentioning

confidence: 99%

“…The sub-wavelength dimensions of the constitutive elements lend these antennas unique characteristics in terms of lightness and flatness, which renders them very appealing for space applications [16]. Moreover, current design methods for modulated MTS antennas are very effective and allow us to meet demanding capabilities such as high efficiency [23], dual polarization [24]- [25], beam shaping [26]- [27], multiple beams [28]- [30] and dual-band operation [31]- [32]. In turn, the multilayered MTS in [33] helps to improve the scanning range of frequency-scanning antennas.…”

Section: Introductionmentioning

confidence: 99%

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Wideband Active Region Metasurface Antennas

Faenzi

González‐Ovejero

Maci

2020

IEEE Trans. Antennas Propagat.

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Modulated metasurface (MTS) antennas with broadside beam rely on the interaction between a radially modulated equivalent impedance and a surface wave (SW) with cylindrical wave-front, launched by a point source. At the frequency where the SW wavelength matches the period of the impedance modulation, the-1 indexed (leaky) mode of the Floquet-mode expansion in cylindrical-coordinates provides a broadside beam. The mismatch between the SW wavelength and the period of the modulation imposes a limitation on the product bandwidth-gain. Here, we overcome this limitation by exponentially stretching the radial period of the impedance modulation. Doing so, an annular active region is generated on the antenna aperture, which moves from the antenna center to the circular rim as the frequency decreases. This mechanism enables a broadside beam over an extreme large bandwidth. We therefore extend significantly the applicability of these antennas, e.g., to requirements of 30 1.5 dB  gain over 30% bandwidths. Here, an analytical formulation is proposed to treat the active region migration and edge outgoing by a Fresnel-type transition function. This function predicts in closed form the antenna bandwidth and average gain. A more accurate gain versus frequency response is also introduced by an integral formula that accounts for the frequency dependent amplitude distribution of the aperture fields. The theory is validated by full-wave simulations and by measurements of a prototype realized by subwavelength elliptical patches. The presented results show that these antennas can provide a performance difficult to reach by any other flat antennas based on printed technology.

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Section: B Amplitude Modulation As a Function Of Frequencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Wideband Active Region Metasurface Antennas

Faenzi

González‐Ovejero

Maci

2020

IEEE Trans. Antennas Propagat.

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“…Multiple HGA technologies have been actively developed: reflectarrays [20]- [21], mesh reflectors [24]- [32], and inflatables [33]- [36]. Other applicable HGA technologies such as membrane antennas [37]- [41], slot arrays [42], [43], and metasurface [15]- [17] will also be discussed in this Section.…”

Section: High Gain Antennasmentioning

confidence: 99%

“…Reference [43] presents the development of an S-band slot array able to produce three operating modes: omnidirectional, multibeam, or directive.…”

Section: Slot Arraysmentioning

confidence: 99%

Advanced CubeSat Antennas for Deep Space and Earth Science Missions: A review

Chahat

Decrossas

González‐Ovejero

et al. 2019

IEEE Antennas Propag. Mag.

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Small satellites provide low cost access to space and they have historically been used for flight technology demonstrations and limited function space science activities. Novel antenna technologies have enabled high performance smallsat telecom, science in earth orbit, and the first Cubesat mission to Deep Space. Over the past 5 years, technologists at the Jet Propulsion Laboratory have designed, tested and successfully flown these innovative and enabling Smallsat antennas. This paper describes these innovations and their impact on smallsat performance for recent and future NASA missions.

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“…Reference [12] superimposes tensorial (anisotropic) impedances associated with broadside pencil beams and different feed positions. However, the case of beams with different shapes is not treated…”

Section: Introductionmentioning

confidence: 99%