Design and Fabrication of PTFE Substrate Integrated Waveguide Coupler by SR Direct Etching

Abstract

The microfabrication technique based on synchrotron radiation (SR) direct etching process has recently been applied to construct PTFE microstructures. This paper proposes a PTFE substrate integrated waveguide (PTFE SIW). It is expected that the PTFE SIW contributes to the improvement of the structural strength. A rectangular through-hole is introduced taking the advantage of the SR direct etching process. First, a PTFE SIW for the Q-band is designed. Then, a cruciform 3-dB directional coupler consisting of the PTFE SIW is designed and fabricated by the SR direct etching process. The validity of the PTFE SIW coupler is confirmed by measuring the frequency characteristics of the S-parameters. The mechanical strength of the PTFE SIW and the peeling strength of its Au film are also additionally investigated.

Design and Fabrication of PTFE Substrate-Integrated Waveguide Butler Matrix for Short Millimeter Waves

“…In this study, the design of a 4×4 Butler matrix for short millimeter waves is attempted using a PTFE-based SIW structure. The SIW structure is favorable in terms of the shape retention of the microstructure and the high degree of freedom in the design [15]. First, the dimensions of the PTFE SIW using rectangular through-holes are determined for G-band (140-220 GHz) operation.…”