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E-raamat: Ultrawideband Antennas: Design And Applications

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(Univ Of London, Uk), (Univ Of Navarra, Spain), (Univ Of Navarra, Spain), (Imperial College London, Uk), (Garcia Of Univ Politecnica De Madrid, Spain)
  • Formaat: 212 pages
  • Ilmumisaeg: 15-Oct-2010
  • Kirjastus: Imperial College Press
  • Keel: eng
  • ISBN-13: 9781908978165
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Ultrawideband Antennas: Design And ApplicationsSuurem pilt
  • Formaat: 212 pages
  • Ilmumisaeg: 15-Oct-2010
  • Kirjastus: Imperial College Press
  • Keel: eng
  • ISBN-13: 9781908978165
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Ultrawideband (UWB) technology, positioned as the cutting edge of research and development, paves the way to meet the emerging demands set by broadband wireless applications, such as high-speed data transmission, medical imaging, short-range radars, electromagnetic testing, etc.This breathtaking resource builds upon the basics of UWB technology to provide a complete compilation of figures of merit along with a vital state-of-the-art of the different antenna alternatives that are to be employed according to the specific application. Without excessive recourse to mathematics, this volume emphasizes on the UWB antenna design and equips readers with practical prediction techniques based on simple formulas and models. The big picture of UWB antenna technology would not be complete without addressing its applications, and this will serve to provide consultants with key clues for slot market searching. Containing over 150 supporting illustrations and figures, this comprehensive overview of UWB technology, antenna design and applications is a vital source of information and reference for R&D organizations, researchers, practitioners, consultants, RF professionals and communication engineers.
Foreword v
Acknowledgements vii
Authors ix
1 Introduction to Ultrawideband Systems
1(14)
Cong Ling
1.1 Overview
1(2)
1.2 UWB Schemes
3(8)
1.2.1 Impulse radio/time hopping
3(2)
1.2.2 Direct sequence
5(1)
1.2.3 Frequency hopping
6(3)
1.2.4 OFDM
9(2)
1.3 Industry Standards
11(1)
1.3.1 Single band versus multiband
11(1)
1.3.2 Standards
11(1)
1.4 Applications
12(1)
1.5 Challenges
13(2)
2 Figures of Merit for UWB Antennas
15(14)
David Puente
Daniel Valderas
2.1 Requirements for a UWB Antenna
16(3)
2.1.1 Efficiency and matching
16(1)
2.1.2 Signal distortion and dispersion (ringing)
17(1)
2.1.3 Stability over frequency of the transmission-reception transfer function
17(2)
2.2 UWB Antenna Parameters
19(8)
2.2.1 Variability in the frequency domain
19(4)
2.2.2 Variability in the time domain: Pulse distortion parameters
23(1)
2.2.3 Variability in the space domain
24(3)
2.3 Simulation in the Time Domain
27(2)
3 Classification of UWB Antennas
29(22)
David Puente
Daniel Valderas
3.1 Helical Antennas
29(2)
3.2 Frequency-independent Antennas
31(3)
3.2.1 Spiral antennas
31(1)
3.2.2 Biconical antennas
32(2)
3.3 Log-periodic Antennas
34(2)
3.4 Horn Antennas
36(3)
3.4.1 3D horn antennas
36(2)
3.4.2 2D horn antennas
38(1)
3.5 UWB Antennas Derived from Resonant Antennas
39(8)
3.5.1 3D monopoles
39(7)
3.5.2 2D resonant antennas
46(1)
3.6 Conclusions
47(4)
4 UWB Monopole Antenna Analysis
51(18)
Daniel Valderas
Juan I. Sancho
4.1 Introduction
51(1)
4.2 Current-conductive Parts on Planar Monopole Antennas
51(5)
4.2.1 Currents parallel and perpendicular to the ground plane: A working hypothesis
51(3)
4.2.2 Non-radiating currents in a PMA
54(2)
4.3 Transmission Line Model for UWB Monopole Antennas
56(5)
4.3.1 General description
56(2)
4.3.2 Description of the model
58(1)
4.3.3 Purpose of the analogy
58(1)
4.3.4 Graphical approach: The Smith Chart
59(2)
4.4 Design Based on TLM
61(8)
4.4.1 Design of an UWB-PMA antenna with a given bandwidth
61(1)
4.4.2 Design of an UWB-PMA antenna having a maximised bandwidth
61(1)
4.4.3 Design of omnidirectional UWB antennas
62(1)
4.4.4 Design of directional UWB antennas
62(1)
4.4.5 Design of 2D PCB antennas for UWB
62(1)
4.4.6 Case study 1: Semi-rectangular planar monopole case
62(3)
4.4.7 Case study 2: Broadband matching of a full-rectangular planar monopole case
65(4)
5 UWB Monopole Antenna Bandwidth Synthesis
69(26)
Daniel Valderas
Juan I. Sancho
5.1 Introduction
69(1)
5.2 Defining the Lower Limit of the Frequency Band
70(1)
5.3 Obtaining the Upper Frequency with Staircase Profile in TLM
71(7)
5.3.1 One step in a PMA's profile according to TLM
71(3)
5.3.2 Two steps in a PMA's profile according to TLM
74(1)
5.3.3 Analytical estimate of the upper limit of the band for a rectangular staircase monopole
75(3)
5.4 Obtaining the Upper Frequency through Slot Etching
78(4)
5.5 Case Study 1
82(4)
5.5.1 Design
82(1)
5.5.2 Simulation and measurements
83(3)
5.6 Case Study 2
86(2)
5.6.1 Design
86(1)
5.6.2 Simulation and measurements
87(1)
5.7 Case Study 3
88(7)
5.7.1 Design
89(1)
5.7.2 Simulation and measurements
90(2)
5.7.3 Discussion: Impedance matching and transfer function
92(3)
6 UWB Monopole Antenna Bandwidth Maximisation
95(20)
Daniel Valderas
Juan I. Sancho
6.1 Introduction
95(6)
6.1.1 Modifying the profile of the edge of the PMA closest to the ground plane
97(1)
6.1.2 Applying TLM: Changing the characteristic impedance
97(4)
6.2 Case Study: Maximising AMP Impedance Bandwidth
101(7)
6.2.1 Lower frequency limit of the band: Initial L, W and p parameters
101(1)
6.2.2 Adjusting the width
102(1)
6.2.3 Changing the height p over the ground plane
102(1)
6.2.4 Implementing a bevelled cut
102(3)
6.2.5 Changing the profile close to the feed
105(1)
6.2.6 Simulation and measurements
106(2)
6.3 Discussion of Spectral Efficiency in Broadband Antennas
108(7)
7 UWB Folded Monopole Antennas
115(24)
Daniel Valderas
Juan I. Sancho
7.1 Introduction
115(2)
7.2 Current Distribution in an Antenna Folded along Vertical Axes
117(1)
7.3 TLM Applied to an FMA
117(3)
7.4 Case Study: Maximising FMA Impedance Bandwidth
120(19)
7.4.1 Design
120(3)
7.4.2 Simulation and measurements
123(10)
7.4.3 Design options
133(6)
8 Revolution Monopole Antennas
139(18)
Daniel Valderas
Juan I. Sancho
8.1 Introduction
139(18)
8.1.1 Current distribution in an RMA
140(3)
8.1.2 TLM applied to an RMA
143(1)
8.1.3 Case study: Maximising RMA impedance bandwidth
143(14)
9 Printed Circuit Monopoles
157(10)
Daniel Valderas
Juan I. Sancho
9.1 Introduction
157(1)
9.2 Current Distribution in a PCM
158(1)
9.3 TLM Applied to a PCM
158(2)
9.4 Case Study: Tailored Bandwidth for UWB PCM
160(7)
9.4.1 Design
160(1)
9.4.2 Simulations and measurements
161(6)
10 Applications of UWB Antennas
167(16)
Xiaodong Chen
10.1 UWB Communications
167(6)
10.1.1 Antennas required in impulse radio system
168(3)
10.1.2 Antennas required in MB-OFDM system
171(2)
10.2 EM Measurement
173(1)
10.2.1 EM spectrum monitoring
173(1)
10.2.2 EMC testing
173(1)
10.3 Medical Imaging---Breast Cancer Detection
174(3)
10.3.1 Horn and tapered slot antennas
175(1)
10.3.2 Stacked patch antennas
176(1)
10.4 Radars
177(6)
10.4.1 Antenna array in impulse radars
178(2)
10.4.2 Broadband phase array
180(3)
Bibliography 183(8)
Index 191
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