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CST Design Studio을이용한Waveguide Component 해석

㈜태성에스엔이기술연구소

EM&MEMS Division

EM Division Application Engineer Jakal www.tsne.co.kr

What is CST Design Studio?

B1P3

P4

P1

P2

B4

B3

B2

Different reference impedances are taken into account.S

P1 P3

P2 P4

Splitting big structures in smaller blocks

EM Division Application Engineer Jakal www.tsne.co.kr

Simple Combline Filter

Problem: Time-signals decay slowly to zero.

Time-Signals from transient analysis

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S-Parameter From Transient Analysis

FFT: Fast Fourier TransformationThe S-Parameters still show the truncation error.

AR-Filter (Autoregressive Filter) AR-Filter significantly reduces the simulation time.

Frequency = 0.4 - 0.75 GHz

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Slice the Structure in Two Parts:

Part 1

Part 2

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Transient Analysis of Part 1

Additional (inner)Port

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Transient Analysis of Part 2

EM Division Application Engineer Jakal www.tsne.co.kr

S-Parameter Results From CST Design Studio:

EM Division Application Engineer Jakal www.tsne.co.kr

Power Divider

Number of meshcells : 33,858 Solver time : 7s

EM Division Application Engineer Jakal www.tsne.co.kr

Power Divider

Solver time : 0.5s

EM Division Application Engineer Jakal www.tsne.co.kr

Power Divider

Microwave Studio Design Studio

EM Division Application Engineer Jakal www.tsne.co.kr

Post Coupled Filter

Bandwith : 7.5~8.5GHz

Total time: 21,760s (= 8 m, 59 s )

Transient Solver(without AR-Filter) Eigenmode Solver

Total time: 21,760s (= 47 s )

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Post Coupled Filter

Solver time : 15s

COPY!!

EM Division Application Engineer Jakal www.tsne.co.kr

Post Coupled Filter

Microwave StudioDesign Studio

EM Division Application Engineer Jakal www.tsne.co.kr

Dual Mode Filter

Bandwith : 12~12.6GHz

Total time: 24852s (= 6 h, 54 m, 12 s )Total time: 24852s (= 15m )

EM Division Application Engineer Jakal www.tsne.co.kr

Conclusion

1. Microwave Studio와 Design Studio를이용하면, High Q을갖는 Filter나Waveguide Component에서빠르고정확한결과를얻을수있었다.

2. Block으로만들부분은 Critical한지점을피하면서, Resonant point을깨는구조를만드는것이빠르고정확한해를얻는조건이었다.

3. 현버젼(V2.3)에서구조을등가회로모델링하여, LC값을찾는데제약이있었다.

(추후가능하리라본다.)