Super-compact multilayered left-handed transmission line and diplexer application

Abstract

A novel super-compact multilayered (ML) composite-right/left-handed (CRLH) transmission line (TL) is proposed. This ML architecture consists of the periodic repetition of pairs of U-shaped parallel plates connected to a ground enclosure by meander lines. The parallel plates provide the left-handed (LH) series capacitance, and the meander lines provide the LH shunt inductance, while the right-handed parasitic series inductance and shunt capacitance are generated by the metallic connections in the direction of propagation and by the voltage gradient from the TL to the ground enclosure, respectively. In contrast to previously reported planar LH or CRLH TLs, the ML TL has its direction of propagation along the vertical direction, perpendicular to the plane of the substrates. This presents the distinct advantage that large electrical length can be achieved over an extremely short TL length and small transverse footprint. The LH-range characteristics of the multilayer CRLH TL are analyzed by the finite-element method and finite-difference time-domain (FDTD) full-wave simulations. In addition, the CRLH equivalent-circuit model is applied to gain simple insight into the behavior of the structure. Finally, the theoretical results are confirmed by experiments using the initial prototype with the very small length (thickness) of 0 016 and footprint of 0 06 0 08 ( = 0 = 235 mm at the center of the LH band, 0.4 GHz). The proposed miniaturized ML line can find applications in bandpass filters, delay lines, and numerous phase-advance components. As an example of application, a 1-GHz/2-GHz diplexer, composed of two ML CRLH TLs, is demonstrated. The ML CRLH TL proposed here presents a great potential for the development of novel microwave components taking profit of new multilayer technologies such as low-temperature co-fired ceramic technology.

Dual-composite right–left-handed transmission lines for the design of compact diplexers

“…This has not been achieved in other previous works for diplexing circuits (i.e. [8][9][10][11]). The selected bands are the corresponding to GSM and GALILEO, just to have miniaturisation and achieve lumped components where its resonance frequency is far away from the working frequency.…”

“…In an attempt to achieve a compact CRLH diplexer, a multilayered three-dimensional diplexer was proposed in [9]. Compactness was achieved at a price of large losses and a relative important frequency shift.…”

“…Different topologies to build CRLH diplexers have been used. In this way, in [8] splitring-resonators were used in a classical diplexer topology.In an attempt to achieve a compact CRLH diplexer, a multilayered three-dimensional diplexer was proposed in [9]. Compactness was achieved at a price of large losses and a relative important frequency shift.…”

A General Framework for the Analysis of Metamaterial Transmission Lines

“…More recently, new metamaterial transmission lines have been proposed which exhibit a more complex frequency behavior [13][14][15][16][17].…”

Negative refraction index of the quantum lossy left-handed transmission lines affected by the displaced squeezed Fock state and dissipation

“…The left-handedness in the LHTL can be achieved by a discrete array of series capacitors and parallel inductors [2][3][4] (Fig.1), which remains the metamaterial via the array of series dual interchanged inductors and capacitors other than the usual discrete representation of the right-handed transmission line (RHTL). LHTL is perhaps one of the most representative and potential candidates due to its non-resonant type with low loss, broad operating frequency band, as well as planar configuration [5,6], which is often related with easy fabrication for NRI applications in a suite of novel guided-wave [7], radiated-wave [8], and refracted-wave devices and structures [9,10].…”