Wideband transmission line model for Archimedean spiral slot structures

Jessica E. Ruyle, Jennifer T. Bernhard

Research output: Contribution to journalArticlepeer-review


Spiral slot structures appear in a variety of microwave applications such as circuit elements, transmission lines and broadband antennas. However, design methodologies for these structures that are accurate above the first resonance involve multi-line transmission line models - requiring difficult to compute multi-line characteristics. This study presents the methodology for a transmission line model for an Archimedean spiral slot structure that uses singly-coupled line characteristics, which can be found analytically, to approximate the multi-line transmission line. With this model, the first resonance and many higher-order resonant frequencies of the spiral structure are well predicted, enabling multi-frequency use of the spiral slot. The results of the model compare well with full-wave simulations and are validated with measurements.

Original languageEnglish (US)
Pages (from-to)1211-1217
Number of pages7
JournalIET Microwaves, Antennas and Propagation
Issue number14
StatePublished - May 15 2014

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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