ABSTRACT
This chapter considers properties of left-handed (LH) and right-handed (RH) transmission line (TL) and different combinations of Left-Handed and Right-Handed Transmission lines, which can be used for a design of miniature microwave devices with improved performance and enriched functionality. Very often the concept of left-handedness is used for structures with backward EM waves in contrast to conventional materials with forward EM waves where the electric field, the magnetic field, and the propagation vector form the RH triad. The transmission-type phase shifter is a lossless two-port providing a change in a phase response of the EM wave under the control signal. Different approaches are used for a description of the fundamental EM properties of metamaterials and the practical realization of these materials as well. The possibility to control the resonant frequency of the first and second modes of the stepped impedance resonator designed as cascaded RH and LH TL sections was successfully used for a design of miniature dual-band filters.
