Simulation of radiation pattern of a large MM wave radio telescope with offset feed

Хайкин, В. Б.; Lebedev, M. K.

doi:10.1109/eucap.2006.4584562

Cited by 2 publications

(3 citation statements)

References 3 publications

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“…The MFPA geometry and simulated multi-beam radiation pattern of the 14 m MM-wave telescope of TRAO, Korea with M=14, q s =7°as well as the corrugated MFPA horns are given in Fig. 1 [23,24]. The beam overlapping level is −8→−9 dB thereby pointed out a need in the more compact high efficiency feed-horn.…”

Section: Multi-beam Mode Of a Radio Telescopementioning

confidence: 98%

“…This defines a magnification of the dual-reflector system M=20→10, the equivalent focus F=10→20f and q s =5°→10°. To achieve q s =7°, the effective corrugated horn should be about 10λ 0 in diameter [23]. In this case, the beam separation with a densely packed MFPA is 2.5→3 HPBW: this complicates the mapping process, reduces the pixel sensitivity and increases the mapping time.…”

Section: Multi-beam Mode Of a Radio Telescopementioning

confidence: 99%

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Compact Efficient Feed-Horn at 30–38 GHz for a Multi-beam Radio Telescope

Chernobrovkin

Popenko

Хайкин

et al. 2010

J Infrared Milli Terahz Waves

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The requirements for a feed suitable for a radio telescope multi-beam focal plane array are considered. A smooth-walled spline-profile horn covering the 30-38 GHz frequency band to be used in a multi-beam receiving array of a radio telescope has been optimized, manufactured and tested. The achieved cross-section aperture size of the horn allows us to provide a neighboring beam spacing equal or less than 2HPBW for the RATAN-600 radio telescope. The measured sidelobe levels of the radiation pattern is less than−30dB/−24dB/−26dB in H/E/45 0 -planes, cross-polarization levels better than−20 dB, an input return loss better than −18 dB and the −3dB/−10dB-beamwidths are of the order of 40º/ 80º over the frequency band. Mutual-coupling of adjacent horns is less than−38 dB.

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Section: Multi-beam Mode Of a Radio Telescopementioning

confidence: 98%

Section: Multi-beam Mode Of a Radio Telescopementioning

confidence: 99%

Compact Efficient Feed-Horn at 30–38 GHz for a Multi-beam Radio Telescope

Chernobrovkin

Popenko

Хайкин

et al. 2010

J Infrared Milli Terahz Waves

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show abstract

“…The effective collecting area is proportional to the maximum gain of the telescope. There are a lot of electromagnetic (EM) simulation software packages that can calculate the radiation pattern for the antenna (Tran 2003;Khaikin & Lebedev 2006;Bolli et al 2018). To perform the EM simulation for the FAST telescope, the GRASP package was applied.…”

Section: Em Simulation For Fastmentioning

confidence: 99%

Simulation of FAST EM performance for both the axial and lateral feed defocusing

Gan

Jiang

Zhu

et al. 2020

Res. Astron. Astrophys.

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Five-hundred-meter Aperture radio Spherical Telescope (FAST) is the world’s largest single dish radio telescope, which is located in Guizhou Province, in southwest China. The FAST feed cabin is supported and positioned by six steel cables. The deviation of the feed position and orientation would lead to loss in the telescope efficiency. In this paper, a series of electromagnetic (EM) simulations of the FAST facility with varying feed positions and orientation offsets was performed. The maximum gain of FAST is about 82.3 dBi and the sibelobe is –32 dB with respect to the main beam at 3 GHz. The simulation results have demonstrated that the telescope efficiency loss is more sensitive to the lateral feed deviation compared with the axial deviation. The telescope efficiency would decrease by 8.2% due to the FAST feed position deviation of 10 mm rms when the observing frequency is 3 GHz. The FAST feed deviation basically has no effect on the sidelobes and cross polarization characteristic according to the simulations.

show abstract

Simulation of radiation pattern of a large MM wave radio telescope with offset feed

Cited by 2 publications

References 3 publications

Compact Efficient Feed-Horn at 30–38 GHz for a Multi-beam Radio Telescope

Compact Efficient Feed-Horn at 30–38 GHz for a Multi-beam Radio Telescope

Simulation of FAST EM performance for both the axial and lateral feed defocusing

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