[HFSS ADS 联合仿真] Design of branch line coupler with 3 dB power division

EE316 Microwave Engineering

Lab 6: Design of branch line coupler with 3 dB power division

记录微波作业，从我做起????
3dB的 branch line coupler(注意区分这一点,后续博客还有个10dB,3阶的branch line coupler!!)
利用ADS仿真（Line calculator）得到MLIN的参数，然后再HFSS中画出模型。

Objective.

• Design of circuit model of the branch-line coupler with 3 dB power division using ADS.
• Full-wave simulation of branch-line coupler using HFSS:

Fig.1 Branch-line coupler. Here Z0 = 50 Ω.

• Schematic considered:

Fig.2 Schematic considered in this lab

• Dimensions for 3 dB branch-line coupler:/

Fig.3 Dimensions for 3 dB branch-line coupler

HFSS Design.

• Model:

  Fig.4 HFSS Model

• Result:

Fig.5 HFSS Result(Rectangular plot of S parameters)

• phase response:

  

Fig.6 Phase response via HFSS

ADS Design.

• Circuit:

Fig.7 ADS circuit

• Result:

Fig.8 ADS Result(Rectangular plot of S parameters)

Fig.9 Phase response via ADS

Analysis & Conclusion

• For both results, S(1,1) and S(4,1) is greatly less equal than -30 dB at 2 GHz. S(2,1) and S(3,1) approximately equal -3 dB at 2 GHz.
• This means that the design of branch line coupler with 3 dB power division is successful.

其实Port3与Port2之间还有90 ∘ ^{\circ} ∘的相位差别以及相同的幅度，当时忘记解释了。