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Beamforming technology for next-generation space applications has requirements such as multi-function, high integration, high performance, and high reliability of the system. In this study, the system was designed based on a differential structure to minimize performance variations and degradation owing to the interconnection of the semiconductor chipset and package. In addition, to compensate for the insertion loss characteristics due to the frequency-dependent loss characteristics of the passive elements, two loss compensation amplifiers with equalization functions were placed to achieve flat in-band transmission characteristics. The proposed chipset provides a phase-adjustment range of 360°C and an amplitude-adjustment range of 31.75 dB, providing precise beam steering and shaping. [ABSTRACT FROM AUTHOR]

In this study, a Ku-band phased array antenna system for aircraft datalink was developed. The antenna system was packed into a module comprising antenna, aperture coupled feeding slot, power combiner, beam-former IC, and control line. The system has a multi-layer stacked structure. A cavity and an aperture coupled slot feeding structures have been applied for the feeding antenna. The 16×16 array antenna has a patch antenna with a gain of 5.8 dBi. The beam can be steered in-between θ=0°∼60°. The maximum gain was 27.2 dBi at broadside and the beam shows a 2.5 dB gain degradation at θ=60°. [ABSTRACT FROM AUTHOR]

The sophistication and diversification of mission equipment for surveillance and reconnaissance is leading to a demand for large-capacity public data links. Overseas, a T4 class(274Mbps) common data link was applied to the Global hwak, a high-altitude unmanned aerial vehicle, and various research and development are being conducted in Korea. In this paper, we propose a structure in which pilot is additionally applied to improve SNR performance while minimizing data transmission rate loss in the DVB-S2 frame structure, which is a european satellite broadcasting standard, for high-capacity transmission of T4 class or higher in the common data link. For the performance evaluation of the proposed structure, the performance of the DVB-S2 was compared and analyzed by simulating the UAV data link channel environment. As a result of simulation, 0.15% of transmission rate loss occurred at T4 class transmission rate compared to DVB-S2 in the proposed structure, but improved SNR reception performance of 0.2~0.3dB was confirmed in the UAV channel environment. [ABSTRACT FROM AUTHOR]