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【文件名】:06124@52RD_Compact and Broadband Microstrip Antennas1.rar
【格 式】:rar
【大 小】:2923K
【简 介】:
【目 录】:
Preface ix
1 Introduction and Overview 1
1.1 Introduction 1
1.2 Compact Microstrip Antennas 1
1.3 Compact Broadband Microstrip Antennas 7
1.4 Compact Dual-Frequency Microstrip Antennas 8
1.5 Compact Dual-Polarized Microstrip Antennas 10
1.6 Compact Circularly Polarized Microstrip Antennas 10
1.7 Compact Microstrip Antennas with Enhanced Gain 12
1.8 Broadband Microstrip Antennas 12
1.9 Broadband Dual-Frequency and Dual-Polarized
Microstrip Antennas 14
1.10 Broadband and Dual-Band Circularly Polarized
Microstrip Antennas 15
2 Compact Microstrip Antennas 22
2.1 Introduction 22
2.2 Use of a Shorted Patch with a Thin Dielectric Substrate 23
2.3 Use of a Meandered Patch 26
2.4 Use of a Meandered Ground Plane 28
2.5 Use of a Planar Inverted-L Patch 33
2.6 Use of an Inverted U-Shaped or Folded Patch 39
3 Compact Broadband Microstrip Antennas 45
3.1 Introduction 45
3.2 Use of a Shorted Patch with a Thick Air Substrate 46
3.2.1 Probe-Fed Shorted Patch or Planar Inverted-F
Antenna (PIFA) 46
3.2.2 Aperture-Coupled Shorted Patch 48
3.2.3 Microstrip-Line-Fed Shorted Patch 50
3.2.4 Capacitively Coupled or L-Probe-Fed Shorted Patch 53
3.3 Use of Stacked Shorted Patches 54
3.4 Use of Chip-Resistor and Chip-Capacitor Loading Technique 55
3.4.1 Design with a Rectangular Patch 55
3.4.2 Design with a Circular Patch 59
3.4.3 Design with a Triangular Patch 70
3.4.4 Design with a Meandered PIFA 76
3.5 Use of a Slot-Loading Technique 78
3.6 Use of a Slotted Ground Plane 79
4 Compact Dual-Frequency and Dual-Polarized
Microstrip Antennas 87
4.1 Introduction 87
4.2 Some Recent Advances in Regular-Size Dual-Frequency
Designs 88
4.2.1 Dual-Frequency Operation with Same
Polarization Planes 88
4.2.2 Dual-Frequency Operation with Orthogonal
Polarization Planes 104
4.2.3 Dual-Frequency Feed Network Designs 108
4.3 Compact Dual-Frequency Operation with Same
Polarization Planes 111
4.3.1 Design with a Pair of Narrow Slots 112
4.3.2 Design with a Shorted Microstrip Antenna 115
4.3.3 Design with a Triangular Microstrip Antenna 121
4.4 Compact Dual-Frequency Operation 129
4.4.1 Design with a Rectangular Microstrip Antenna 129
4.4.2 Design with a Circular Microstrip Antenna 140
4.4.3 Design with a Triangular Microstrip Antenna 146
4.5 Dual-Band or Triple-Band PIFA 149
4.6 Compact Dual-Polarized Designs 149
4.6.1 Design with a Slotted Square Patch 149
4.6.2 Design with a Slotted Ground Plane 154
4.6.3 Design with a Triangular Patch 156
5 Compact Circularly Polarized Microstrip Antennas 162
5.1 Introduction 162
5.2 Designs with a Cross-Slot of Unequal Arm Lengths 162
5.3 Designs with a Y-Shaped Slot of Unequal Arm Lengths 1685.4 Designs with Slits 172
5.4.1 With a Slit 172
5.4.2 With a Pair of Slits 177
5.4.3 With Four Inserted Slits 181
5.5 Designs with Spur Lines 192
5.6 Designs with Truncated Corners 193
5.6.1 With a Triangular Patch 194
5.6.2 With a Square-Ring Patch 194
5.6.3 With a Triangular-Ring Patch 198
5.6.4 With a Slotted Square Patch 201
5.7 Designs with Peripheral Cuts 203
5.8 Designs with a Tuning Stub 205
5.8.1 With a Circular Patch 205
5.8.2 With a Square-Ring Patch 209
5.8.3 With a Triangular Patch 211
5.9 Designs with a Bent Tuning Stub 213
5.10 Compact CP Designs with an Inset
Microstrip-Line Feed 215
6 Compact Microstrip Antennas with Enhanced Gain 221
6.1 Introduction 221
6.2 Compact Microstrip Antennas with High-Permittivity
Superstrate 221
6.2.1 Gain-Enhanced Compact Broadband
Microstrip Antenna 221
6.2.2 Gain-Enhanced Compact Circularly Polarized
Microstrip Antenna 223
6.3 Compact Microstrip Antennas with Active Circuitry 225
7 Broadband Microstrip Antennas 232
7.1 Introduction 232
7.2 Use of Additional Microstrip Resonators 233
7.3 Microstrip Antennas with an Air Substrate 236
7.3.1 Design with a Modified Probe Feed 236
7.3.2 Design with a U-Slotted Patch 237
7.3.3 Design with an E-Shaped Patch 241
7.3.4 Design with a Three-Dimensional V-Shaped Patch 249
7.4 Broadband Slot-Loaded Microstrip Antennas 251
7.4.1 Design with a Rectangular Patch 251
7.4.2 Design with a Circular Patch 260
7.5 Broadband Microstrip Antennas with an Integrated
Reactive Loading 261
7.5.1 Design with a Rectangular Patch 261
7.5.2 Design with a Circular Patch 2637.5.3 Design with a Bow-Tie Patch 267
7.5.4 Design with a Triangular Patch 270
7.6 Broadband Microstrip Antennas with Reduced
Cross-Polarization Radiation 273
8 Broadband Dual-Frequency and Dual-Polarized
Microstrip Antennas 279
8.1 Introduction 279
8.2 Broadband Dual-Frequency Microstrip Antennas 279
8.2.1 A Two-Element Microstrip Antenna 279
8.2.2 A Three-Dimensional V-Shaped Microstrip Antenna 280
8.3 Broadband Dual-Polarized Microstrip Antennas 282
8.3.1 Use of Two Aperture-Coupled Feeds 282
8.3.2 Use of a Gap-Coupled Probe Feed and an H-Slot
Coupled Feed 287
8.3.3 Use of an L-Strip Coupled Feed and an H-Slot
Coupled Feed 288
9 Broadband and Dual-Band Circularly Polarized
Microstrip Antennas 294
9.1 Introduction 294
9.2 Broadband Single-Feed Circularly Polarized
Microstrip Antennas 295
9.3 Broadband Two-Feed Circularly Polarized Microstrip Antennas 298
9.3.1 Use of Two Gap-Coupled Probe Feeds with a Wilkinson
Power Divider 298
9.3.2 Use of Two Capacitively Coupled Feeds with a Wilkinson
Power Divider 299
9.3.3 Use of Two Capacitively Coupled Feeds with
a Branch-Line Coupler 305
9.4 Broadband Four-Feed Circularly Polarized
Microstrip Antennas 307
9.5 Dual-Band Circularly Polarized Microstrip Antennas 309
9.5.1 A Probe-Fed Circular Patch with Two Pairs
of Arc-Shaped Slots 309
9.5.2 A Probe-Fed Square Patch with a Center Slot
and Inserted Slits 312
9.5.3 A Probe-Fed Stacked Elliptic Patch 321
Index 325
In order to meet the miniaturization requirements of portable communication equipment,
researchers have given much attention recently to compact microstrip antennas.
Many related compact designs with broadband dual-frequency operation, dualpolarized
radiation, circularly polarized radiation, and enhanced antenna gain have
been reported. Many significant advances in improving the inherent narrow operating
bandwidth of microstrip antennas have been published in the open literature since
1997. By using presently available techniques, one can easily achieve an impedance
bandwidth (1:2 voltage standingwave ratio) of larger than 25% for a probe-fed singlepatch
microstrip antenna. Other feeding methods such as the use of an aperturecoupled
feed, a capacitively coupled feed, or a three-dimensional microstrip transition
feed can yield impedance bandwidths greater than 40% with good radiation
characteristics for a single-patch microstrip antenna. In addition, various designs for
achieving broadband circularly polarized radiation, broadband dual-frequency operation,
and broadband dual-polarized radiation have been demonstrated. Taking broadband
circularly polarized radiation as an example, some recently reported designs
exhibit a 3-dB axial-ratio bandwidth greater than 40% for a single-patch microstrip
antenna.
Since 1997, the author and his graduate students at National Sun Yat-Sen
University, Kaohsiung, Taiwan, have published more than 100 refereed journal papers
on the subject of compact and broadband microstrip antennas. These results along
with many other advanced designs reported recently by antenna researchers are scattered
in many technical journals, and it is the intention of this book to organize these
advanced designs in the areas of compact and broadband microstrip antennas.
The microstrip antenna designs covered in this book are divided into two groups:
compact microstrip antennas and broadband microstrip antennas. The book is
organized into nine chapters. Chapter 1 presents an introduction and overview of
recent advances in the design of both compact and broadband microstrip antennas.
Chapters 2–6 describe in detail advanced designs for compact microstrip antennas, |
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