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The article reports that metamaterials and unconventional composite-right-left-handed (CRLH) transmission lines combine to create radio frequency (RF)/ microwave bandpass filters with miniature dimensions for wireless applications. Use of metamaterials and CRLH enables the design of RF/microwave BPFs with small size, low passband loss, and low cost.

The article offers the information on the microwave band pass filters and leverage metamaterial resonators for low passband insertion loss and high out-of-band rejection for wireless applications at 2.4 GHz. The article also mentions about the open-loop resonator is constructed by adding half-wave-length microstrip lines with a certain coupling structure to achieve the required filter performance.

The article focuses the use of impedance tunable composite right/left-handed (CRLH) coplanar-waveguide (CPW) transformer to match a 200-0 load to a 50-0 line. It highlights the designing of Composite right/left-handed (CRLH) transmission lines which have magnetic permeability and effective negative dielectric permittivity.

The article offers information on designing an UWB bandpass filter by using metamaterials and composite-right-left-handed transmission lines. The U.S. Federal Communications Commission allowed use of 3.1 to 10.6 GHz and fractional bandwidths for indoor and outdoor data transmission systems. Multimode resonators were also used in UWB filter designs.

The article describes a compact dual-band ultrawideband power divider that is designed for multiband orthogonal frequency division multiplexing and for direct sequence ultrawideband applications from 6.2 to 9.0 gigahertz. Topics mentioned include insertion loss exhibited by the power divider, global expansion of wireless services and systems, and the use of dual composite right- and left-handed metamaterial transmission lines in a microstrip configuration.

The article discusses the ultrawideband (UWB) antenna with dual-frequency band notched characteristics. It states that the design of the antenna covers total frequency range of 2.3 to 12.5 gigahertz (GHZ) with voltage standing wave ratio (VSWR). It mentions that the monopole printed circuit UWB antennas offer advantages for wireless communications applications such as ease of fabrication, small size, and low cost.

The article reports that a new configuration of composite right/left-handed metamaterial-based transmission lines were the building blocks for a novel triple-band compact resonator. The multiple-band resonator is fabricated on standard commercial circuit material with dielectric constant of 3.55 and thickness of 1.52 mm.

The article discusses the importance of flexible antennas in wireless applications, including wearable electronics and sensor systems. It is noted that a robust yet compact ultrawide-band (UWB) antenna was based microstrip feed approach and is fabricated on flexible liquid crystalline polymer substrate material. It is noted that flexible wireless devices are rapidly increasing with regard to wearable and implantable devices for health-monitoring systems.