Antenna Concepts and Technologies for Future 5G Satellites

Schneider, Michael; Hartwanger, Christian; Kilian, Michael

doi:10.1109/5gwf.2019.8911675

Cited by 5 publications

(3 citation statements)

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“…However, the small features of these matching elements have an impact on manufacturing lead times and costs when using standard computer numerical control (CNC) milling techniques. They also make them particularly sensitive to manufacturing errors in millimeter-wave frequencies, independently of the manufacturing technique used, which is not desirable for the design of large closely spaced array antennas considered for future broadband communication satellites [ 12 ]. There is an interest in simplifying the design of compact dual-probe waveguide OMTs while maintaining simultaneously low port-to-port coupling and high XPD values.…”

Section: Very Compact Waveguide Omtmentioning

confidence: 99%

“…The in-plane dimension is important for the design of closely spaced array antennas that are currently considered for broadband communication satellites, specifically in low and medium Earth orbit (LEO/MEO) systems with larger scanning ranges. Furthermore, the mechanical simplicity of the proposed OMT is essential for increasing the manufacturing yield in large arrays and for possibly adapting the design toward additive manufacturing techniques [ 12 ]. The waveguide OMT design with folded single-mode ports reported in Section 3 may be easily adapted for such purposes, as it presents very limited overhanging areas.…”

Section: Very Compact Waveguide Omt With Folded Portsmentioning

confidence: 99%

“…An alternative implementation of this solution comprises a folded in-line port such that both single-mode ports are opposite to each other, resulting typically in a more compact implementation along the longitudinal direction [ 8 , 9 , 10 , 11 ]. However, these configurations are not suited for closely spaced arrays required for future broadband communication satellite systems [ 12 ], as the side-coupling port results in a footprint twice that of the waveguide’s broad wall along the coupling direction.…”

Section: Introductionmentioning

confidence: 99%

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Very Compact Waveguide Orthomode Transducer in the K-Band for Broadband Communication Satellite Array Antennas

Fonseca

2023

Sensors

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A very compact waveguide orthomode transducer (OMT) is described in this paper. The design is characterized with a twofold rotationally symmetric cross-section in the probing area, adapted from a side-coupling OMT design, simultaneously enabling low port-to-port coupling and high cross-polarization discrimination (XPD) over a fractional bandwidth of about 15–20%. Compared to previously reported compact waveguide OMTs, the proposed design is simpler, thus facilitating its manufacture at millimeter-wave frequencies. The concept is demonstrated with a design in the K-band for a broadband communication satellite downlink over the frequency band of 17.3–20.2 GHz. For test purposes, transitions to standard waveguide WR42 are included, and the OMT is assembled with a conical horn antenna. The measured reflection and coupling coefficients are below −19.5 dB and −22.9 dB, respectively, over the nominal bandwidth, and they are in good agreement with the simulation’s results. The on-axis XPD, measured in an anechoic chamber, is better than 30 dB over the nominal bandwidth, which is also in line with simulations. The proposed waveguide OMT may be designed to fit in a lattice below one wavelength at the highest operating frequency, which is desirable for dual-polarized closely spaced array antennas in low and medium Earth orbit communication satellite systems. The simple mechanical design of the proposed OMT makes it particularly appealing for additive manufacturing techniques, as demonstrated with a variant of the design having folded single-mode waveguides, which preserves the RF properties of the original design.

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Section: Very Compact Waveguide Omtmentioning

confidence: 99%

Section: Very Compact Waveguide Omt With Folded Portsmentioning

confidence: 99%