Publication

Ultra-Small Bent Meta-Waveguide Filters

Abstract

This paper demonstrates the capability of locally resonant metamaterials (LRMs) for creating compact metallic waveguide E- and H-bends, which are simultaneously working as bandpass filters. For creating these bent meta-filters, we use composite pin-pipe waveguides (CPPWs), which are a type of LRMs made from resonant pins inserted in a rectangular waveguide. Like linear-shaped CPPWs, the subwavelength spatial dispersion in E- and H-bent CPPWs can nucleate a hybridization bandgap and subwavelength modes with custom frequency and bandwidth. To guarantee compatibility with standard waveguides and to improve the matching, we design subwavelength metamaterial ports. Finally, we build and test narrow and wideband H-bent CPPW filters, compatible with WR75 (10-15GHz) interfaces. Our measurements demonstrate the excellent performance of the small bent meta-filters and the customizability of the bandwidth. Our findings enable us to merge assembly components, such as bends and filters, in an ultra-small volume. It may find applications for reducing the size of waveguide networks with complex geometries in telecommunication and radar applications.

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Related concepts (33)
Waveguide filter
A waveguide filter is an electronic filter constructed with waveguide technology. Waveguides are hollow metal conduits inside which an electromagnetic wave may be transmitted. Filters are devices used to allow signals at some frequencies to pass (the passband), while others are rejected (the stopband). Filters are a basic component of electronic engineering designs and have numerous applications. These include selection of signals and limitation of noise.
Superlens
A superlens, or super lens, is a lens which uses metamaterials to go beyond the diffraction limit. The diffraction limit is a feature of conventional lenses and microscopes that limits the fineness of their resolution depending on the illumination wavelength and the numerical aperture NA of the objective lens. Many lens designs have been proposed that go beyond the diffraction limit in some way, but constraints and obstacles face each of them. In 1873 Ernst Abbe reported that conventional lenses are incapable of capturing some fine details of any given image.
Band-pass filter
A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. In electronics and signal processing, a filter is usually a two-port circuit or device which removes frequency components of a signal (an alternating voltage or current). A band-pass filter allows through components in a specified band of frequencies, called its passband but blocks components with frequencies above or below this band.
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