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The Increasing Demand For Wireless Communications Has Revolutionised The Lifestyle Of Today's Society And One Of The Key Components Of Wireless Technology Is Antenna Design. Broadband Planar Antennas Are The Newest Generation Of Antennas Boasting The Attractive Features Required, Such As Broad Operating Bandwidth, Low Profile, Light Weight, Low Cost And Ease Of Integration Into Arrays Or Radio Frequency (rf) Circuits, To Make Them Ideal Components Of Modern Communications Systems. Research Into Small And Broadband Antennas Has Been Spurred By The Rapid Development Of Portable Wireless Communi Broadband Planar Antennas; Contents; Foreword; Preface; Acknowledgements; 1 Planar Radiators; 1.1 Introduction; 1.2 Bandwidth Definitions; 1.2.1 Impedance Bandwidth; 1.2.2 Pattern Bandwidth; 1.2.3 Polarization Or Axial-ratio Bandwidth; 1.2.4 Summary; 1.3 Planar Antennas; 1.3.1 Suspended Plate Antennas; 1.3.2 Bent Plate Antennas; 1.4 Overview Of This Book; References; 2 Broadband Microstrip Patch Antennas; 2.1 Introduction; 2.2 Important Features Of Microstrip Patch Antennas; 2.2.1 Patch Shapes; 2.2.2 Substrates; 2.2.3 Feeding Structures; 2.2.4 Example: Rectangular Microstrip Patch Antennas 2.3 Broadband Techniques2.3.1 Lowering The Q; 2.3.2 Using An Impedance Matching Network; 2.3.3 Case Study: Microstrip Patch Antenna With Impedance Matching Stub; 2.3.4 Introducing Multiple Resonances; 2.3.5 Case Study: Microstrip Patch Antenna With Stacked Elements; References; 3 Broadband Suspended Plate Antennas; 3.1 Introduction; 3.2 Techniques To Broaden Impedance Bandwidth; 3.2.1 Capacitive Load; 3.2.2 Slotted Plates; 3.2.3 Case Study: Spa With An W-shaped Slot; 3.2.4 Electromagnetic Coupling; 3.2.5 Nonplanar Plates; 3.2.6 Vertical Feed Sheet 3.3 Techniques To Enhance Radiation Performance3.3.1 Radiation Characteristics Of Spas; 3.3.2 Spa With Dual Feed Probes; 3.3.3 Case Study: Center-concaved Spa With Dual Feed Probes; 3.3.4 Spa With Half-wavelength Probe-fed Strip; 3.3.5 Spa With Prob