L Band Phased Array Feed Noise Figure and Radiation Efficiency Measurement with the Antenna Y Factor Method
| Autor: | Mitchell C. Burnett, David Buck, Nathaniel Ashcraft, Spencer Ammermon, Brian D. Jeffs, Karl F. Warnick |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of Astronomical Instrumentation. |
| ISSN: | 2251-1725 2251-1717 |
| DOI: | 10.1142/s2251171723500022 |
| Popis: | The noise performance of a high sensitivity, wide-field astronomical phased array feed receiver can be characterized by measurements using the antenna Y factor method. These measurements are used to determine figures of merit for an active array receiver. Antenna elements for the Advanced L Band Phased Array Camera for Astronomy (ALPACA) were measured using the antenna Y factor method to determine the active array and receiver noise figure, the antenna loss, receiver equivalent noise temperature, and radiation efficiency of the system over its 500[Formula: see text]MHz operating bandwidth. The completed ALPACA instrument will feature a fully cryogenic design with both the low-noise amplifiers and array elements cryogenically cooled. The uncooled performance measurements from the antenna Y factor method are used to extrapolate the elements cryogenic radiation efficiency and antenna loss showing that it is expected that the elements will contribute less than 1 K to the overall system noise temperature. These results validate the antenna Y factor method to measure key antenna parameters such as the antenna radiation efficiency and show that the instruments front-end array and electronics meets expected performance targets. |
| Databáze: | OpenAIRE |
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