Table of Contents
1 Cover
7 1 A Perspective of Antennas for 5G and 6G 1.1 5G Requirements of Antenna Arrays 1.2 6G and Its Antenna Requirements 1.3 From Digital to Hybrid Multiple Beamforming 1.4 Analog Multiple Beamforming 1.5 Millimeter‐Wave Antennas 1.6 THz Antennas 1.7 Lens Antennas 1.8 SIMO and MIMO Multi‐Beam Antennas 1.9 In‐Band Full Duplex Antennas 1.10 Conclusions References
8 2 Millimeter‐Wave Beamforming Networks 2.1 Circuit‐Type BFNs: SIW‐Based Butler and Nolen Matrixes 2.2 Quasi Optical BFNs: Rotman Lens and Reflectors 2.3 Conclusions References
9 3 Decoupling Methods for Antenna Arrays 3.1 Electromagnetic Bandgap Structures 3.2 Defected Ground Structures 3.3 Neutralization Lines 3.4 Array‐Antenna Decoupling Surfaces 3.5 Metamaterial Structures 3.6 Parasitic Resonators 3.7 Polarization Decoupling 3.8 Conclusions References
10 4 De‐scattering Methods for Coexistent Antenna Arrays 4.1 De‐scattering vs. Decoupling in Coexistent Antenna Arrays 4.2 Mantle Cloak De‐scattering 4.3 Lumped‐Choke De‐scattering 4.4 Distributed‐Choke De‐scattering 4.5 Mitigating the Effect of HB Antennas on LB Antennas 4.6 Conclusions References
11 5 Differential‐Fed Antenna Arrays 5.1 Differential Systems 5.2 Differential‐Fed Antenna Elements 5.3 Differential‐Fed Antenna Arrays 5.4 Differential‐Fed Multi‐Beam Antennas 5.5 Conclusion References
12 6 Conformal Transmitarrays 6.1 Conformal Transmitarray Challenges 6.2 Conformal Transmitarrays Employing Triple‐Layer Elements 6.3 Beam Scanning Conformal Transmitarrays 6.4 Conformal Transmitarray Employing Ultrathin Dual‐Layer Huygens Elements 6.5 Elliptically Conformal Multi‐Beam Transmitarray with Wide‐Angle Scanning Ability 6.6 Conclusions References
13 7 Frequency‐Independent Beam Scanning Leaky‐Wave Antennas 7.1 Reconfigurable Fabry–Pérot (FP) LWA 7.2 Period‐Reconfigurable SIW‐Based LWA 7.3 Reconfigurable Composite Right/Left‐Handed LWA 7.4 Two‐Dimensional Multi‐Beam LWA 7.5 Conclusions References
14 8 Beam Pattern Synthesis of Analog Arrays 8.1 Thinned Antenna Arrays 8.2 Arrays with Rotated Elements 8.3 Arrays with Tracking Abilities Employing Sum and Difference Patterns 8.4 Synthesis of SIMO Arrays