Truncated Phase Reversal Fresnel Lens Antenna for mm-Wave and IoT Applications

A novel design approach for truncating a phase-reversal Fresnel lens is presented. This method relies on focusing the feed antenna’s radiation in a single plane through the use of cascaded dielectric slabs, effectively removing the need for a conventional feeding network. The proposed feed is realized using printed circuit board (PCB) technology, offering a highly economical solution. Its microstrip line feed allows direct integration with transceiver ICs, avoiding the need for complex transitions commonly associated with horn or waveguide feeds. Furthermore, the design is compact and maintains a low-profile structure. The proposed method reduces the lens size by 56%. The resulting lens antenna achieves a peak realized gain of 29 dBi at 30 GHz and has an aperture efficiency of 12%. Its impedance bandwidth is 13.3%, while the 3-dB gain bandwidth is 6.7%. The side-lobes are effectively suppressed, ranging from -10 to -15 dB across the entire operating band. This antenna design is well suited for high-gain millimeter-wave (mm-Wave) and Internet of Things (IoT) applications.