Exact TLM Boundary Conditions for Closed Homogeneous Waveguide

Authors: Pierantoni L.¹; Tomassoni C.¹; Rozzi T.²

Source: AEÜ – International Journal of Electronics and Communications, Volume 57, Number 2, April 2003 , pp. 128-136(9)

Publisher: Urban & Fischer

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Abstract:

In this contribution we introduce a rigorous and efficient method producing exact TLM boundary conditions for closed homogeneous waveguides. This approach uses the modal expansion of the EM field and the modal transfer functions between different planes. The absorbing condition is imposed by sampling the modal coefficients on arbitrary planes inside the TLM-domain and translating them to the terminal planes. Accuracy and efficiency of the method are demonstrated for the H-plane junction and for thick inductive irises in rectangular waveguide, providing excellent wide-band match of the fundamental mode as well as of higher order modes excited by the discontinuity.

Keywords: TLM; Time-domain; Modal analysis; Field analysis

Language: English

Document Type: Original article

DOI: http://dx.doi.org/10.1078/1434-8411-54100151

Affiliations: 1: Dipartimento di Elettronica ed Automatica, Università degli Studi di Ancona, Italy – Italian National Institute for Physics of Matter (INFM). E-mail: l.pierantoni@ee.unian.it 2: DIEI, University of Perugia, Via G. Duranti 93, 06125 Perugia, Italy

Publication date: 2003-04-01