Wideband mm-wave compensated 90° bends for Grounded Coplanar Waveguide and microstrip Transmission Lines on flexible LCP substrates

摘要

The purpose of this paper is to describe an approach for creating the first truly wideband (10-90 GHz), high performance, compensated 90deg bends for planar transmission lines fabricated on liquid crystal polymer (LCP) for use with mm-wave applications. These bends are very critical components for the miniaturization of high performance packages used for integrated multi-layer millimeter-wave front-ends on low-cost, organic, flexible substrates. In this paper we describe a method for creating ultrawideband, low-cost, high performance bends for microstrip and grounded coplanar waveguide (CPWG) lines. The simulated S-parameters demonstrated a return loss below -30 dB from 10 GHz-90 GHz for the microstrip line bends and below -22 dB for the CPWG bends. These bends are capable of operating for applications ranging from X to W-bands.