Designing a band notch filter for a UWB antenna using CST MWSOptimization or not?Optimization or not?

Ad Reniers

Introduction

Ultra Wide-Band filter structures and analysis Simulation setup and results Conclusions

/ Electrical Engineering PAGE 19-4-2010

Ultra Wide-band

Ultra wide-band frequencies between 3.1 GHz and 10.6 GHz

To avoid interference between 5 GHz and 6 GHz reserved for WLAN we where asked to design a filter

/ Electrical Engineering PAGE 29-4-2010

Ultra Wide-band antenna

A compact antenna was needed Evolution from a thin wire dipole to

a printed pseudo monopoleD

H3

H2

/ Electrical Engineering PAGE 39-4-2010

H2

H1

Top layer copperBottom layer copperSubstrate

WsW

Ultra Wide-Band filter structures and analysis Simulation setup and results Conclusions

/ Electrical Engineering PAGE 49-4-2010

Notch filter analyses

An U shaped gap for Notch filter characterization BIBII

/ Electrical Engineering PAGE 59-4-2010

Top layer copperBottom layer copperSubstrateGap in the copper

AIAIII

AII

Spur filter analyses

Spur line filter in the transmission line

DII

=

/ Electrical Engineering PAGE 69-4-2010

DI

Top layer copperBottom layer copperSubstrateGap in the copper

CII

Notch and spur filter results

BI

DII

BII

S11 PARAMATERSHP8510

Ad Reniers, 27 juni 2007

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Results with the filters combined

/ Electrical Engineering PAGE 79-4-2010

DI

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UWB Antenne U notch SpurSimulatie Notch & SpurIdeaal

Ultra Wide-Band filter structures and analysis Simulation setup and results Conclusions

/ Electrical Engineering PAGE 89-4-2010

Simulation setup in CST using the optimizer (1)

BIBII

Optimizer only used for the notch filter Parameter and goal settings:

/ Electrical Engineering PAGE 99-4-2010

Top layer copperBottom layer copperSubstrateGap in the copper

AIAIII

AII

Simulation setup in CST using the optimizer (2)

BIBII

Reflectie ParametersSimulatie CST Microwave Studio

Door Ad Reniers, Datum 6 juni 2007

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/ Electrical Engineering PAGE 109-4-2010

Top layer copperBottom layer copperSubstrateGap in the copper

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0.000 1.000 2.000 3.000 4.000 5.000 6.000 7.000 8.000 9.000 10.000 11.000 12.000Frequency (GHz)

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BCDEFGeen FilterIdeaal

Sim. AI, AII and BII (mm)

BI + BII(mm)

AIII(mm)

BW (GHz@ -10dB)

Ampl.(dB)

B 1.31 5.99 mm 7.30 4.34 ..6.28 -1.72

C 1.19 5.93 7.46 4.38 .. 6.19 -1.83

D 1.22 5.96 7.16 4.56 .. 5.96 -2.72

E 0.99 5.96 8.60 4.28 .. 6.35 -1.68

F 1.33 5.39 7.18 4.61 .. 5.75 -5.86

Simulation setup in CST not using the optimizer

BI

DII

BII

Reflectie ParametersSimulatie CST Microwave office

Door Ad Reniers, 23 juni 2007

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/ Electrical Engineering PAGE 119-4-2010

DI

Top layer copperBottom layer copperSubstrateGap in the copper

AIAIII

AII

CII

Sim. AI, AII and BII (mm)

BI + BII(mm)

AIII(mm)

BW (GHz@ -10dB)

Ampl.(dB)

1ra 1.20 7.20 8.00 4.42 .. 5.80 -2.63

1rb 1.20 7.20 6.80 4.85 .. 6.00 -3.51

1rc 1.20 7.20 6.40 5.04 .. 6.08 -3.95

1rd 1.20 7.20 6.00 5.22 .. 6.16 -4.49

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Ideaal1r1ra1rb1rc1rd

Results using the optimizer/iterative process

BI

DII

BII

Reflectie ParametersSimulatie CST Microwave office

Door Ad Reniers, 23 juni 2007

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S11 PARAMATERSHP8510

Ad Reniers, 27 juni 2007

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/ Electrical Engineering PAGE 129-4-2010

DI

Top layer copperBottom layer copperSubstrateGap in the copper

AIAIII

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CII-40

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0.000 1.000 2.000 3.000 4.000 5.000 6.000 7.000 8.000 9.000 10.000 11.000 12.000Frequentie (GHz)

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Ideaal1rk1rl

Sim. AI, AII and BII (mm)

BI + BII(mm)

AIII(mm)

CI + CIII(mm)

CII(mm)

DI + DII(mm)

BW (GHz@ -10dB)

Ampl.(dB)

1rk 1.20 7.20 6.00 0.84 0.6 5.6 4.70 .. 6.24 -2.36

1d 1.22 5.96 7.16 NA NA NA 4.56 .. 5.96 -2.72

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Ferquency (GHz)

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UWB Antenne U notch SpurSimulatie Notch & SpurIdeaal

Ultra Wide-Band filter structures and analysis Simulation setup and results Conclusions

/ Electrical Engineering PAGE 139-4-2010

Conclusions

Using the optimizer is a good starting point if there is no analytical model

You should know what to expect Not the ultimate tool The iterative process gives more inside in

/ Electrical Engineering PAGE 149-4-2010

Top layer copperBottom layer copperSubstrateGap in the copper

The iterative process gives more inside in the working of the filter itself

Combination of using the optimizer and a iterative process is the most efficient way to design.

Thank you for your attention