Miniaturized Transmission Lines Based on Hybrid Lattice-Ladder Topology

作者：Koochakzadeh Masoud^*; Abbaspour Tamijani Abbas

来源：IEEE Transactions on Microwave Theory and Techniques, 2010, 58(4): 949-955.

DOI：10.1109/TMTT.2010.2042847

• Artificial transmission lines
• delay line
• filters
• loaded lines
• miniaturization
• quality factor
• slow wave
• synthetic transmission lines
• transmission lines

This paper introduces hybrid structures with unit cells that are a combination of lattice and ladder topologies. These unit cells dramatically increase the quality factor, miniaturization, and maximum frequency of synthetic transmission lines. Also, it is shown that lattice topologies in general are less vulnerable to the effect of parasitics, such as self resonance of loading capacitors or mutual inductance between different cells. The underlying theory is studied, and simple formulas are given for predicting the behavior of these lines. A few examples are presented that, based on full-wave simulations, show the large gain in miniaturization, quality factor, or bandwidth compared to the simple ladder or lattice structures. Measured results for a fabricated synthetic line are presented that show a miniaturization factor of n = root mu(eff)is an element of(eff) = 16.5 for Z(0) = 50 Omega and a very small dispersive behavior from dc to 2.5 GHz.

• 出版日期2010-4