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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2013-10-25
Comparison and Optimization of Dispersion, and Losses of Planar Waveguides on Benzocyclobutene (Bcb) at THz Frequencies: Coplanar Waveguide (CPW), Microstrip, Stripline and Slotline
By
Lei Cao,

    Dr. Lei Cao

    Universite Paris Sud

    France

    Homepage

Anne-Sophie Grimault-Jacquin,

    Dr. Anne-Sophie Grimault-Jacquin

    Universit´e Paris Sud

    France

    Homepage

Frederic Aniel

    Dr. Frederic Aniel

    Univ. Paris-Sud

    France

    Homepage

Progress In Electromagnetics Research B, Vol. 56, 161-183, 2013
doi:10.2528/PIERB13072603 | Google Scholar

Abstract
This paper proposes an investigation in the terahertz (THz) frequency range of the dispersion and an individual quantitative treatment of the losses of the most classical microwave waveguides (coplanar, slotline, microstrip and stripline) numerically led in three dimensions (3D). An original strategy has been used to quantify radiation losses associated with leaky modes. A very low THz permittivity polymer (benzocyclobutene (BCB)) was used as a very convenient substrate to be easily grafted as a THz environment of integrated passive or/and active devices. Direct comparisons of the losses and the dispersion have been performed following two criteria: a constant characteristic impedance Zc fixed at 100 Ω and a constant effective width Weff fixed at 30 μm. The best waveguides are microstrip (αT= 2.52 dB/mm for Zc= 100 Ω and for W/H=35/50 μm (with W the strip width and H the substrate height) and αT =2.29 dB/mm for Weff = 30 μm at 1 THz with H = 30 μm) and stripline (with quasi-null radiation losses and the best quality factor QT= 63 for Zc = 100 Ω). The large dispersion and radiation losses of the slotline (SL) can be reduced with a thick BCB encapsulation to enhance the THz signal. The coplanar waveguide (CPW) remains in a medium position. Besides the parasitic mode (SL) and low QT problems due to mainly ohmic losses, its major advantage is its planar geometry allowing to an easy circuit integration with THz sources, amplifiers and detectors based on semiconductor. Consequently, these THz studies on BCB microwave standard waveguides open to various perspectives to carry out a broad panel of integrated THz circuits.
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Citation
Lei Cao, Anne-Sophie Grimault-Jacquin, and Frederic Aniel, "Comparison and Optimization of Dispersion, and Losses of Planar Waveguides on Benzocyclobutene (Bcb) at THz Frequencies: Coplanar Waveguide (CPW), Microstrip, Stripline and Slotline," Progress In Electromagnetics Research B, Vol. 56, 161-183, 2013.
doi:10.2528/PIERB13072603
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