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We describe a multibeam receiver for the FAST radiotelescope. The receiver provides 19 dual polarised beams over a band of 1050–1450 MHz with an expected receiver noise temperature under 7 K and aperture efficiency of greater than 62%. The feed is currently undergoing final assembly and testing.
The performance of an L-band 19-element multibeam feed for the five-hundred-metre aperture spherical radio telescope is verified here. Radiation patterns have been measured in an anechoic chamber in the radiating near field of the array and compared with simulated radiation patterns from HFSS for the same conditions. Very good agreement is observed between the measurements and simulations.
We describe a new phased array feed design. The array is composed of elements based on a solid of revolution fed by twin wire transmission lines. An infinite array model is used to simulate the noise performance of the array and this model is compared with a full EM simulation of the finite array and measured noise data. The modelling indicates that this array is an excellent candidate for a phased...
We describe a new phased array feed design. The array is composed of elements based on a solid of revolution fed by twin wire transmission lines. An infinite array model is used to simulate the noise performance of the array and this model is compared with a full EM simulation of the finite array and measured noise data. The modelling indicates that this array is an excellent candidate for a phased...
An L-band 19-element multibeam feed has been designed for the proposed Five-hundred-meter Aperture Spherical radio Telescope. Physical optics analysis of the full reflector with mutlibeam feed has been undertaken. The analysis results are presented here.
This paper presents the design of a compact, suspended microstrip line, bandpass filter with precision Radio-Frequency Interference (RFI) mitigation capability. The presence of strong RFI adjacent to the lower-end of the operating band of the recently upgraded Australia Telescope Compact Array (ATCA) 1–3 GHz cryogenic receiver systems necessitated the development of a band defining filter with a very...
We describe the design and measured parameters of an offset probe, quad ridged, ortho-mode transducer (OMT). The OMT operates over a 3.4:1 bandwidth from 3.6–12.4GHz. The OMT exhibits a return loss of greater than 15dB and an isolation of greater than 50dB across the full band. Simulations predict spurious mode production at the circular waveguide port to be greater than 15dB below the TE11 mode.
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