Compact wideband coplanar stripline‐to‐microstrip line transition using a bended structure on a two‐layered substrate

Gwan Hui Lee, Wahab Mohyuddin, Sachin Kumar, Hyun Chul Choi, Kang Wook Kim

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A design of a compact coplanar strip (CPS)‐to‐microstrip line (MSL) transition using a bended structure on a two‐layered substrate is presented. The proposed transition consists of a CPS taper and a bended CPS‐to‐MSL transition on a two‐layered substrate. The CPS taper is formed on the lower substrate with low permittivity (εr = 3.38), and the bended CPS‐to‐MSL transition is formed on the upper substrate with high permittivity (εr = 10.2). The proposed transition is designed with analytical formulas obtained by applying EM‐based conformal mapping without parametric tuning trials. The conductor shape of the bended CPS‐to‐MSL transition is adjusted to form an optimal Klopfenstein impedance taper. The proposed CPS‐to‐MSL transition optimally connects between a high impedance CPS line (~160 Ω) and a 50 Ω MSL, which typically results in a long transition length for ultra‐wideband performance. The implemented transition bended in a sinusoid shape on the two‐layered substrate provides good performance from 2 GHz to 17 GHz with the maximum 2 dB insertion loss per transition, and the horizontal length of the bended transition is reduced to 42.9% of the straight transition length. This bended transition is developed for use in mm‐wave balanced antenna/detector feeds but can be applied to a variety of wideband balanced circuit modules, where compact circuit size is critical.

Original languageEnglish
Article number1272
JournalElectronics (Switzerland)
Volume10
Issue number11
DOIs
StatePublished - 1 Jun 2021

Keywords

  • Bended structure
  • CPS‐to‐MSL transition
  • Compact
  • Conformal mapping
  • Two‐layered structure
  • Ultra‐wideband

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