Analysis and Design of Quadruple-Ridged Waveguides

Weimin Sun, Constantine Balanis

Research output: Contribution to journalArticlepeer-review

108 Scopus citations


In a previous paper, a unified approach has been proposed for the analysis and design of single-and double-ridged waveguides by a magnetic field integral equation (MFIE) formulation [1]. This paper presents a continuing work with emphasis on the design of quadruple-ridged waveguides. The characteristics of square, circular and diagonal quadruple-ridged waveguides, including cutoff frequencies, attenuation, impedance and modal field distributions, are first time systematically analyzed and reported. Distinct to being in a single- or double-ridged waveguide, the fundamental mode in a quadruple-ridged waveguide has a cutoff frequency very close to that of the second-lowest mode, thus the natural single mode bandwidth is very small. However, when the second-lowest mode is effectively suppressed or not excited, a very wide bandwidth (6:1) can be achieved. This unique property, plus the capabilities of dual-polarization, high power, and low impedance, makes the quadruple-ridged waveguides well-suited to many antenna and microwave applications.

Original languageEnglish (US)
Pages (from-to)2201-2207
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number12
StatePublished - Dec 1994

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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