High frequency design and characterization of SU-8 based conductor backed coplanar waveguide transmission lines

• The epoxy-based negative photoresist SU8 is widely used within the MEMS (Micro-Electro-Mechanical Systems) community, and is well known for its ability to form thick layers with high aspect ratios and for its chemical resistance. However, only a few papers have investigated the electrical properties of this material and mostly within the MEMS area or at lower frequency ranges.This paper presents the design and characterization of conductor-backed coplanar waveguide (CBCPW) transmission lines using SU-8 dielectric material. The coplanar transmission lines are carefully designed using EDA tools, and fabricated on a metallized glass substrate coated with SU-8 material. S-parameter measurements are performed from 45 MHz to 50 GHz using a vector network analyzer and a probe station. From these measurements, transmission line parameters such as characteristic impedance, attenuation constant, effective dielectric constant, loss tangent, etc, are determined. The design procedure, fabrication process and measurement results are described in this paper.To our knowledge, this is the first time the SU-8 material is characterized in Microelectronics using CBCPW transmission lines.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Elektroteknik och elektronik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Electrical Engineering, Electronic Engineering, Information Engineering (hsv//eng)

Keyword

Conductor-backed coplanar waveguides (CBCPW) transmission lines; Coplanar waveguides (CPW); Dielectric measurement; High frequency electrical characterization; Microwave measurements; Chemical resistance; Microelectromechanical devices; Natural frequencies; Photoresistors; Conductor-backed coplanar waveguides (CBCPW) transmission lines; Coplanar waveguides (CPW); Dielectric measurement; High frequency electrical characterization; Microwave measurements; Waveguides

Electrical engineering, electronics and photonics

Elektroteknik, elektronik och fotonik

Publication and Content Type

ref (subject category)

kon (subject category)