the edges of the PCBs. To diminish the mismatch between the PCB edge and the free space, two types of planar strips are printed in front of the SEA aperture. With the printed strips, both the impedance bandwidth and the front‐to‐back ratio are improved. Aiming at increasing the aperture efficiency, two kinds of substrate‐integrated lenses are embedded in the SEAs. The phase‐correcting lenses are integrated into the SEAs, maintaining the compact profiles of SEAs. Moreover, a leaky‐wave SEA loaded with a prism lens is presented with a fixed‐beam over a wide frequency band. The prism lens is implemented by utilizing a dispersive metasurface. By compensating for the dispersion of the leaky‐wave SEA and the prism lens, fixed radiation beams are achieved over a 20% fraction bandwidth at Ka‐band.
1.10 Summary
The research, development, and applications of mmW antennas have a long history. With the fast progress in device technologies and rapid deployment of system for a variety of commercial applications, theory, and technologies related to mmW antennas have been extensively investigated and developed [54–64]. This book will address the critical design challenges of mmW antennas for wireless communications and radar systems.
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