Single feed solution for simultaneous X-band and Ka-band satellite communications

Rain attenuation at Ka-band is a severe phenomenon that drastically impairs satellite communications at these frequencies. Several adaptive compensation techniques have been elaborated to counteract its effects and most often applied one at a time. The present paper proposes the contemporary exploitation of different techniques in a combined approach. Such an integrated approach is thoroughly analyzed in a simplified scenario and will be shown to achieve a very effective solution, making the Ka-band spectrum fully available for broadband satellite applications and network-centric systems.

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Adaptive transmission scheme in Ka-band satellite communications

2016 IEEE International Conference on Digital Signal Processing (DSP) ◽

10.1109/icdsp.2016.7868574 ◽

2016 ◽

Author(s):

Cui-Qin Dai ◽

Nan-Nan Huang ◽

Qianbin Chen

Keyword(s):

Satellite Communications ◽

Adaptive Transmission ◽

Transmission Scheme ◽

Ka Band

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A Highly Efficient Dual-Band Transmitarray Antenna Using Cross and Square Rings Elements

Applied Computational Electromagnetics Society ◽

10.47037/2021.aces.j.360705 ◽

2021 ◽

Vol 36 (7) ◽

pp. 852-857

Author(s):

Yongliang Zhang ◽

Xiuzhu Lv ◽

Jiaxuan Han ◽

Shuai Bao ◽

Yao Cai ◽

...

Keyword(s):

Satellite Communications ◽

Dual Band ◽

Band Ratio ◽

Maximum Gain ◽

Aperture Efficiency ◽

Dielectric Substrates ◽

Highly Efficient ◽

X Band ◽

Transmission Phase ◽

Ku Band

In this paper, a highly efficient dual-band transmitarray antenna using cross and square rings elements is presented for X and Ku bands. The dual-band transmitarray is designed for downlink/uplink frequencies of Ku band satellite communications. The transmitarray element consists of four metal patches and two dielectric substrates. The metal patch is printed on both sides of the substrate. By optimizing the parameters, the transmitarray element can achieve a transmission phase coverage greater than 360° and work independently in both frequency bands. Then, a method to select the size of the element is proposed, so that all the elements in the array can realize the transmission phase of the two frequencies as much as possible. A 201-elements transmitarray antenna is fabricated and measured and the band ratio of the antenna is 1.13. The measured maximum gain at 11.5 GHz is 22.4 dB, corresponding to the aperture efficiency is 52.7%. The measured maximum gain at 13 GHz is 24.2 dB, corresponding to the aperture efficiency is 62.4%. The 1-dB gain bandwidths are 9.7% (10.8-11.9 GHz) at X band and 9% (12.6-13.8 GHz) at Ku band.

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A study of frequency utilization efficiency of OFDMA adaptive coding and modulation on Ka-band satellite communications system

Advances in Communications Satellite Systems: Proceedings of the 37th International Communications Satellite Systems Conference (ICSSC-2019) ◽

10.1049/pbte095e_ch25 ◽

2021 ◽

pp. 325-341

Keyword(s):

Satellite Communications ◽

Utilization Efficiency ◽

Ka Band ◽

Adaptive Coding ◽

Communications System

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Bifocal Dual-Reflectarray Antenna to Generate a Complete Multiple Spot Beam Coverage for Satellite Communications in Ka-Band

Electronics ◽

10.3390/electronics9060961 ◽

2020 ◽

Vol 9 (6) ◽

pp. 961

Author(s):

Eduardo Martinez-de-Rioja ◽

Jose A. Encinar ◽

Giovanni Toso

Keyword(s):

Satellite Communications ◽

Lower Number ◽

Orthogonal Polarization ◽

Ka Band ◽

Satellite Applications ◽

Deviation Factor ◽

Reflectarray Antenna ◽

First Time ◽

Spot Beam ◽

Multiple Spot

This paper presents a novel multibeam transmitting dual-reflectarray antenna able to generate a complete multiple spot coverage from a geostationary satellite in Ka-band (20 GHz). The bifocal design technique has been exploited for the first time to reduce by 50% the beam deviation factor with respect to the equivalent monofocal antenna, allowing to produce adjacent beams separated by only 0.56° in the antenna offset plane. In order to guarantee an acceptable spillover, the main reflectarray has been oversized in the same plane where the beams are compressed, resulting in an elliptical reflectarray of 3.5 m × 1.8 m. The interleaved beams required to provide the complete multi-spot coverage are produced in the orthogonal polarization, using the same aperture and feeds. The proposed antenna requires a smaller main aperture (about half of the area) and a lower number of feeds than other configurations that use a single oversized reflector to generate a complete multi-spot coverage, showing promising results for communication satellite applications in the Ka-band.

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