极低插损的超宽带低温耦合器设计
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摘要
本文介绍了一种工作温度≤20 K(-253℃)的超宽带低温耦合器的设计方法,采用超宽带对称式耦合器理论设计出2～14 GHz超宽带、30 d B的耦合器,针对低温环境影响,采取特殊工艺,实现超宽带低温耦合器工作温度≤20 K。通过ADS仿真软件对其进行仿真并经实测,结果表明,该耦合器具有优良的性能,在11 K工作温度下,2～14 GHz全频带内插损≤0. 23 d B,耦合度为29. 32～30. 76 d B,带内波动≤1. 44 dB,端口驻波≤1. 3,实测数据与仿真结果具有很好的一致性。
A method for designing an UWB cryogenic coupler operating below temperatures of 20 K(-253 ℃) was presented in this paper. A 2 ～ 14 GHz UWB coupler with 30 d B coupling was designed by the theory of UWB symmetrical multi-section directional coupler,some special processes were taken for ultra-low ambient temperatures. The coupler was simulated by ADS software and the result proved that the coupler was fine. In the frequency of 2 ～ 14 GHz,the practicality test results at 11 K temperature was : Insertion loss≤0. 23 d B,coupling 29. 32 ～ 30. 76 d B and ripple≤1. 44 d B,VSWR≤1. 30. The measurement data was good consistent with simulation result.
A method for designing an UWB cryogenic coupler operating below temperatures of 20 K(-253 ℃) was presented in this paper. A 2 ～ 14 GHz UWB coupler with 30 d B coupling was designed by the theory of UWB symmetrical multi-section directional coupler,some special processes were taken for ultra-low ambient temperatures. The coupler was simulated by ADS software and the result proved that the coupler was fine. In the frequency of 2 ～ 14 GHz,the practicality test results at 11 K temperature was : Insertion loss≤0. 23 d B,coupling 29. 32 ～ 30. 76 d B and ripple≤1. 44 d B,VSWR≤1. 30. The measurement data was good consistent with simulation result.
引文
[1]Levy Ralph.General synthesis of asymmetric multi-element coupled-transmission-line directional couplers[J].IEEE Trans Microwave Theory Tech,1963,11(4):226-237.
[2]Cristal E G,Young L.Theory and tables of optimum symmetrical TEM-mode coupled-transmission-line directional couplers[J].IEEE Trans Microwave Theory Tech,1965,13(9):554-558.
[3]Toulios P P,Todd A C.Synthesis of symmetrical TEM-mode directional couplers[J].IEEE Trans Microwave Theory Tech,1965,13(9):536-544.
[4]Cohn S B.Characteristic impedance of broadside-coupled strip transmission lines[J].IRE Trans.Microwave Theory and Techniques,1960,8(6):633-637.
[2]Cristal E G,Young L.Theory and tables of optimum symmetrical TEM-mode coupled-transmission-line directional couplers[J].IEEE Trans Microwave Theory Tech,1965,13(9):554-558.
[3]Toulios P P,Todd A C.Synthesis of symmetrical TEM-mode directional couplers[J].IEEE Trans Microwave Theory Tech,1965,13(9):536-544.
[4]Cohn S B.Characteristic impedance of broadside-coupled strip transmission lines[J].IRE Trans.Microwave Theory and Techniques,1960,8(6):633-637.