采用低噪声HEMT场效应管和低噪声放大器单片的混合电路形式开展Ku波段低噪声放大器的设计。设计出的低噪声放大器产品取得了很低的噪声(噪声系数≤1.29 d B)、较大的线性动态范围、较小的增益带内起伏和尺寸等优越性能,且在40 GHz频率...采用低噪声HEMT场效应管和低噪声放大器单片的混合电路形式开展Ku波段低噪声放大器的设计。设计出的低噪声放大器产品取得了很低的噪声(噪声系数≤1.29 d B)、较大的线性动态范围、较小的增益带内起伏和尺寸等优越性能,且在40 GHz频率范围内无条件稳定。该产品成功应用于某型号装备中,很好地提高了该装备的信号接收能力。它也可应用于相应频段的卫星通讯、空间遥感及雷达等的接收系统中。展开更多
This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for the Fivehundred-meter Aperture Spherical radio Telescope(FAST) telescope. The development of key low noise microwave parts of cou...This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for the Fivehundred-meter Aperture Spherical radio Telescope(FAST) telescope. The development of key low noise microwave parts of coupling low noise amplifier(Coupling-LNA) and conical quad-ridge orthogonal mode transducers(OMT) and reasonable system integration achieve outstanding performance of receiver. It covers the frequency range of 1.2 GHz to 1.8 GHz. Novel cryogenic Coupling-LNAs with low noise, large return loss, high dynamic range and the function of coupling calibration signals are developed for the proposed receiver. Amplification and coupling function circuits are integrated as a single Coupling-LNA with full noise temperature of 4 K at the physical temperature of 15 K. Its return loss is more than 18 d B, and output1 d B compression power is +5 d Bm. A cryogenic dewar is fabricated to provide 55 K and 15 K cryogenic environment for OMT and Coupling-LNAs, respectively. The receiver's system noise temperature is below9 K referred to feed aperture plane. Benefiting from optimal design and precise mechanical treatment, good scattering performance of OMT and equalized radiation patterns of horn are achieved with an antenna efficiency above 75%.展开更多
文摘采用低噪声HEMT场效应管和低噪声放大器单片的混合电路形式开展Ku波段低噪声放大器的设计。设计出的低噪声放大器产品取得了很低的噪声(噪声系数≤1.29 d B)、较大的线性动态范围、较小的增益带内起伏和尺寸等优越性能,且在40 GHz频率范围内无条件稳定。该产品成功应用于某型号装备中,很好地提高了该装备的信号接收能力。它也可应用于相应频段的卫星通讯、空间遥感及雷达等的接收系统中。
基金supported by the National Key R&D Program of China(2018YFE0202900)the National Natural Science Foundation of China(U1831110)。
文摘This paper presents an ultra-low noise L-band radio astronomical cryogenic receiver for the Fivehundred-meter Aperture Spherical radio Telescope(FAST) telescope. The development of key low noise microwave parts of coupling low noise amplifier(Coupling-LNA) and conical quad-ridge orthogonal mode transducers(OMT) and reasonable system integration achieve outstanding performance of receiver. It covers the frequency range of 1.2 GHz to 1.8 GHz. Novel cryogenic Coupling-LNAs with low noise, large return loss, high dynamic range and the function of coupling calibration signals are developed for the proposed receiver. Amplification and coupling function circuits are integrated as a single Coupling-LNA with full noise temperature of 4 K at the physical temperature of 15 K. Its return loss is more than 18 d B, and output1 d B compression power is +5 d Bm. A cryogenic dewar is fabricated to provide 55 K and 15 K cryogenic environment for OMT and Coupling-LNAs, respectively. The receiver's system noise temperature is below9 K referred to feed aperture plane. Benefiting from optimal design and precise mechanical treatment, good scattering performance of OMT and equalized radiation patterns of horn are achieved with an antenna efficiency above 75%.
