Table Of ContentMultiband Non-Invasive
Microwave Sensor
Design and Analysis
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Multiband Non-Invasive
Microwave Sensor
Design and Analysis
Brijesh Iyer
Nagendra Prasad Pathak
CRC Press
Taylor & Francis Group
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Library of Congress Cataloging‑in‑Publication Data
Names: Iyer, Brijesh, author. | Pathak, Nagendra Prasad, author.
Title: Multiband non-invasive microwave sensor : design and analysis / Brijesh Iyer,
Nagendra Prasad Pathak.
Description: First edition. | Boca Raton, FL : CRC Press, Taylor & Francis Group, 2018. |
Includes bibliographical references and index.
Identifiers: LCCN 2017049171| ISBN 9781138300989 (hardback : acid-free paper) | ISBN
9780203732946 (ebook)
Subjects: LCSH: Biosensors--Design and construction. | Search and rescue operations--
Equipment and supplies. | Vital signs. | Bioelectronics. | Microwave antennas-- Design
and construction.
Classification: LCC R857.B54 I94 2018 | DDC 610.28--dc23
LC record available at https://lccn.loc.gov/2017049171
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Contents
Preface ......................................................................................................................xi
Authors .................................................................................................................xiii
1. Introduction .....................................................................................................1
1.1 Introduction: Background and Driving Forces ...................................1
1.2 Theory of Non-Invasive VSD Radar ...................................................2
1.2.1 Working Principle ....................................................................5
1.2.2 Issues with the NIVSD Sensor ...............................................5
1.2.2.1 Clutters .......................................................................6
1.2.2.2 DC Offset ...................................................................6
1.2.2.3 Null Point Detection ..................................................7
1.2.2.4 Higher-Order Harmonics .......................................7
1.2.2.5 Signal Processing ..................................................8
1.2.2.6 Number of Operational Bands ...............................8
1.3 Scope of the Book .....................................................................................8
1.4 About This Book ....................................................................................9
1.5 Concluding Remarks ..........................................................................10
2. Preliminaries and Review ..........................................................................11
2.1 Introduction ......................................................................................11
2.2 Radio Architecture..............................................................................11
2.2.1 Transmitter Architecture ......................................................12
2.2.1.1 Direct Conversion Architecture ...........................12
2.2.1.2 The Two-Step Architecture ...................................12
2.2.1.3 Offset PLL Architecture ........................................13
2.2.1.4 The Multiband Multifunction Transmitter ........14
2.2.2 Receiver Architecture ............................................................14
2.2.2.1 Homodyne Receiver Architecture .......................14
2.2.2.2 Heterodyne Receiver Architecture ......................15
2.2.2.3 Multifunctional Receiver Architecture ...............15
2.3 State-of-the-Art NIVSD Radar ...........................................................16
2.3.1 Radar Architecture ................................................................18
2.3.1.1 CW Doppler Radar .................................................19
2.3.1.2 UWB Radar .............................................................19
2.3.1.3 FMCW Radar ..........................................................20
2.3.1.4 Interferometric CW Radar ....................................20
2.3.1.5 On-Chip Integrated Radar ....................................20
2.3.2 Methods for Performance Enhancement ............................20
2.3.2.1 Clutter and Phase Noise ........................................20
2.3.2.2 DC Offset .................................................................22
vii
viii Contents
2.3.2.3 Null Point Detection ................................................22
2.3.2.4 Higher-Order Harmonics.......................................23
2.4 Research Gaps in the Existing NIVSD Sensors ..............................24
2.5 Concluding Remarks ..........................................................................26
3. Design and Characterization of the Radiating Elements .....................27
3.1 Introduction .........................................................................................27
3.2 Theory of Microstrip Antennas ........................................................27
3.3 Characterization of the Concurrent Dualband Patch Antenna ....29
3.3.1 Directional 1 × 2 Patch Antenna Array .................................30
3.3.1.1 Background .............................................................30
3.3.1.2 Geometry .................................................................31
3.3.1.3 Parametric Study ....................................................31
3.3.1.4 Experimental Characterization and Discussion ...34
3.3.2 Omnidirectional 1 × 2 Patch Antenna Array.....................43
3.3.2.1 Geometry .................................................................43
3.3.2.2 Characterization .....................................................43
3.4 Conclusions ..........................................................................................48
4. Concurrent Dualband Front-End Elements for NIVSD Sensors ........49
4.1 Introduction ...............................................................................................49
4.2 Concurrent Dualband WPD ..............................................................49
4.2.1 Related Work .................................................................................50
4.2.2 Geometry ............................................................................................51
4.2.3 Characterization .....................................................................52
4.3 Concurrent Dualband LNA ...............................................................54
4.3.1 Related Work .................................................................................54
4.3.2 DC Bias Point and Stability Analysis ..................................56
4.3.3 Design of Concurrent DC Bias Network ............................57
4.3.4 Concurrent Dualband Matching Network ...........................61
4.3.5 Measurement and Analysis ..................................................64
4.4 Oscillators.............................................................................................67
4.4.1 DC Bias Simulation and Bias Network Design ..................69
4.4.2 Stability Analysis and S-Parameter Simulations ...............70
4.4.3 Design of Matching Networks .............................................71
4.4.4 Design of Resonator Network ..............................................73
4.4.5 Harmonic Balance Simulation .............................................74
4.4.6 Measurement Results ............................................................74
4.5 Conclusions ..........................................................................................78
5. Characterization of a Concurrent Dualband NIVSD Sensor ..............79
5.1 Introduction .........................................................................................79
5.2 Design Considerations .......................................................................79
5.2.1 Safety Factor (S) ......................................................................79
5.2.2 Transmitted Power.................................................................80
Contents ix
5.2.3 Optimum and Null Point Consideration ............................80
5.2.4 Radar Range Equation ..........................................................81
5.2.5 Receiver Noise Figure ...........................................................81
5.2.6 Link Budget ............................................................................81
5.2.7 Link Budget ............................................................................82
5.3 Measurement System ..........................................................................82
5.4 Sensor Characterization as an Integrated System ..........................93
5.4.1 Link Budget Calculation .......................................................94
5.4.2 Link Margin Calculation ......................................................95
5.4.3 Detection Range Analysis ....................................................97
5.4.4 Safety Factor Analysis ...........................................................97
5.5 Signal Processing ................................................................................98
5.6 Conclusions ........................................................................................103
6. Occupancy Sensors.....................................................................................105
6.1 Introduction: Background and Driving Forces ............................105
6.2 Characterization of the Occupancy Sensor ...................................107
6.2.1 Baseband Signal Processing ...............................................108
6.2.2 Performance Analysis .........................................................109
6.2.3 Indoor Location Detection of Human Subject .................113
6.3 Conclusions ........................................................................................116
7. Conclusions and Future Scope .................................................................117
7.1 Conclusions ........................................................................................117
7.2 Future Scope ......................................................................................118
7.2.1 Reconfigurable/Tunable Concurrent Dualband NIVSD ...118
7.2.2 Handheld Concurrent Dualband Human Life
Tracking Sensor ....................................................................119
References .................................................................................................................121
Index .....................................................................................................................129
