INVESTIGATIONS ON DIELECTRIC INTEGRATED GUIDES FOR MILLIMETER WAVE APPLICATIONS
A thesis submitted in fulfilment of the requirements of the degree of
DOCTOR OF PHILOSOPHY
BY
ANUP KUMAR TIWARI April, 1984
onus,
DEPARTMENT OF ELECTRICAL ENGINEERING
INDIAN INSTITUTE OF TECHNOLOGY
NEW DELHI INDIA
ACKNOWLEDGEMENTS
I acknowledge with great pleasure the guidance and encouragement received from Professor Dr.Bharathi Bhat throughout the course of this work.
I extend my sincere thanks to all the scientific staff of microwave group, Centre for Applied Research in Electronics, for their help and moral support during this course of work.
i'or the course of this work, I was sponsored by Maulana luad College of Technology, Bhopal under Quality
Improvement Programme of Ministry of EdUcation, Govt. of India: This is thankfully acknowledged.
I am very much thankful to ar.Sodhi for preparing the drawing.
Finally I am thankful to my wife for her moral support during the course of this work.
(ANUP KUMAR TDIARI)
CERTIFICATE
This is to certify that the work reported in
this thesis entitled ,,Investigations on Dielectric Integrated Guides for Millimeter 'Jaye Applications' by At. Anup Kumar Tiwari has been carried out under my guidance and supervision.
The results contained in it have not been submitted in part or in full to any other University or Institute for award of any degree or diploma.
Prof.Bharathi Bhat
Centre for Applied Research in Electronics
Department of Elect.-1;ngg.
Indian Institute of Technology New Delhi.110016, INDIA,
CONTENTS
CHAPTER-I 1.1
1.2 1.3
R-EVI,1 OF DIELECTRIC INTEGRATD GUIDES Introduction
Types of Dielectric Integrated Guides Methods of Analysis
Page No.
1 2 14 1.3.1 Effective Dielectric Constant
Method 14
1.3.2 Mode Matching Technique 16
"
1.J ., Finite Element Method 17 1.3.4 Transverse Resonance Method 18 1.3.5 Generalized Telegraphist's
Equation Method 18
1.4 Characteristics Of Dielectric image•
Guides 19
1.4.1 Rectangular Dielectric
Image guide 19
1.4.2 Insular Image Guide 21 1.4.3 Cladded Dielectric Wav3guide 22 1.4.4 Y Dielectric Guide 23 1.4.5 Inverted Strip Dielectric
Javeguide 23
1.4.6 H Guide 24
1.4.7 Hollow Image Guide 25 1.4.8 Trapped Image Guide 26
1.4.9 Non Radiative Dielectric
javeguide 27
1.4.10 Semi Circular Dielectric
Image Guide 28
1.5 Dielectric Guide Couplers 28 1.5.1 Coupled Dielectric Lines 28 1.5.2 Dielectric Image Guide
Coupler 29
Inverted Strip Image Guide
Coupler 30
1.5.4 Non Radiative Image Guide Coupler
1.5.5 Various Dielectric Image
Guide Components 31 1.6 Scope Of The Thesis 33 1.7 Organization Of The Thesis 55
References
CHAPTER-II ANALYSIS OF GENERALIZED COUPLED DIELECTRIC GUIDE
2.1 Introduction 49
2.2 Analysis Of Generalized Dielectric
Guide Using Mode Matching Technique 49
2.2.1 TM Modes 51
2.2.2 TE Modes 64
2.3 Characteristic Equations 74 2.4 Reduction To Other Dielectric
Guide Structures 76
References 78
CHAPTER-III SHIELDED RECTANGULAR DIMWCTRIC GUIDE
3.1 Introduction 79 •
3.2 Shielded Suspended Dielectric
Guide 82
3.2.1 • Dispersion Characteristics 82 3.2.2 Wave Impedance 82
3
.
3 Insulated Non-Radiative DielectricGuide
85
3.3.1 Dispersion Characteristics 88
3.
3.2 Derivation Of Conductor LossCoefficient 88
3.3.3 'Derivation Of Dielectric Loss
Coefficient 91
3.3.4 Loss Characteristics 92 lave Impedance 94
3.4 Trapped Insulated Image Guide 96 3.4.1 Effect of Bottom Metallic Plane 96
3.4.2 Effect of the Side Metallic
Walls 96
3.4.5 Wave Impedance 99 3.4.4 E Field Plots 103 3.5 Trapped Image Guide 103 3.5.1 Dispersion Characteristics 106 3.5.2 \lave Impedance 108
3.6 Conclusions 115
References 118
CHAPTER-IV INSULATED BROADSIDE COUPLED/
NON-RADIATIVE COUPLED DIELECTRIC GUIDES
4.1 Introduction 119
4.2
Insulated Broadside CoupledDielectric Guide • 119 4.2.1 Effect Of Top and Bottom
Metal Planes 120
4.2.2 Effect of Half Spacing s
Between the Dielectric Slabs 123 4.2.3 k;Ifect of Side Metallic falls 127 4.2.4 Directional Coupler In Insulated
Broadside Coupled Dielectric
Guide Configuration 130 4.3 Broadside Coupled Dielectric Guide 134
4.3.1 Effect of Half Spacing Between
The Dielectric Slabs 134 4.3.2 Effect of Aspect Ratio 136
4.3.3 Wave Impedance 139
4.3.4 .electric Field Plots 144 4.3.5 Directional Coupler In Broad-
side Coupled Dielectric Guide
Configuration 155
4.4 Non Radiative Phenomenon In Coupled
Dielectric Guides 158 4.4.1 Insulated Non Radiative
Coupled Guide 158
4.4.2 Directional Coupler In Insulated Non Radiative Coupled Dielec-
tric Guide Configuration 161 4.4.3 Non Radiative Coupled
Dielectric Guide 164
.4.4.4 Directional Coupler In Non Radiative Coupled Dielectric Guide configu-
ration 164
4.5 Conclusions 167
References 170
CHAPTER-V COUPLED TRAPPED INSULATED IMAGE GUIDE
5.1 Introduction • 171
5,2 Effect of Insulating Layer
Thickness 172
5.3 Effect of Spacing Between
Dielectric Slabs 175
5.4 Effect of Metallic Side 'jails 178
5.5 Wave Impedance 181
5.6 E Field Plots 184
5.7 Directional Coupler In Coupled Trapped•Insulated Image Guide
Configuration 187
5.8 Conclusiono 190
5.9 Reference 192
CHAPTER-VI TRAPPED COUPLED DIELECTRIC IMAGE GUIDE
6.1 Introduction 193
6.2
r ,
o.;
Effect of Metallic Side Jails Effect of Half Spacing s Between the Dielectric Slabs
195 195
6.4 Wave Impedance 198
6.5 Directional Coupler in Trapped
Coupled Image Guide Configuration 204
6.6 Conclusions 206
References 208
CHAPTER-VII DEVICE FABRICATION AND
EXPERIMENTAL INVESTIGATIONS 209
7.1 Introduction 209
7.2 Rectangular Metal Waveguide to
Dielectric Image Guide Transition 209 7.2.1 Design of Transition 210 7.2.2 Experimental Set Up 214 7.2.3 Measurement of Transition
loss 216
7.3 Transmission loss of Trapped .
Image Guide 218
7.4 Transmission loss of Trapped
Insulated Image Guide 220
7.5
Electric Field Probe 220 7.5.1 Construction of EField Probe 220
7.5.2 Measurement of Propagation
Constant by E Field Probe 22:7, 7.6 Measurement of Propagation
Constant of Insulated and
Trapped Insulated Image Guide 224 7.7
7.7.1 7.8
Trapped Image Guide Coupler Coupling Property of Tragped Image Guide Coupler
Conclusions
226
226
228
References 230
Concluding Remarks 232
