Metasurfaces for Filter Miniaturization and Out-of-Band Rejection Improvement

Abstract

This work presents a novel implementation of metasurface filters with high performance and compact size for future space applications. A K -band fourth-order metasurface filter is proposed with a center frequency of 18.5 GHz and bandwidth of 400 MHz with an out-of-band rejection that is better than 30 dB over the range of 20-50 GHz. The proposed filter has a measured insertion loss of 1.47 dB and a quality factor of 670. The resonators implemented in this filter exhibit a miniaturization of 63% when compared to a conventional rectangular waveguide (RWG) resonator. The compact size and high-performance capabilities make the proposed filter an ideal solution for space applications.

A wideband polarization diversified MIMO antenna with improved isolation using machine learning optimized metasurface absorber

“…When electromagnetic waves are incident upon such devices, they may start to resonate across a specific frequency range if they achieve near unity, often known as 'perfect' absorption [3]. Metasurfaces are now being used in a variety of applications, including the decrease of radar cross section (RCS) [4], energy harvesting [5], sensing [6], filters [7], reduction of SAR (Specific Absorption Rate) [8] polarization converters [9] and other similar uses. The use of a metasurface absorber to enhance isolation in MIMO antennas, however, has not been investigated extensively.…”

A 3-D-Printed Dielectric Resonator for Triple-Mode Applications

“…Therefore, it is important to investigate miniaturization methods for these types of filters while working to maintain high-quality factors and dynamic filtering responses. Many approaches to miniaturization exist, such as the use of dielectric resonators, which reduce the structural size by compressing the electromagnetic fields [1], metamaterials [2], and multimode monoblock filters [3]. In a recent work on utilizing ceramic additive manufacturing (AM) for dielectric combline resonators [4], the quality factor performance of higher modes was increased and dual-mode operation was achieved through changes in the geometry.…”