Detection of band edge frequencies in symmetric/asymmetric dielectric loaded helix slow-wave structures


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Şimşek S.

International Journal Of Circuit Theory And Applications, vol.1, pp.1-18, 2021 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 1
  • Publication Date: 2021
  • Doi Number: 10.1002/cta.3138
  • Title of Journal : International Journal Of Circuit Theory And Applications
  • Page Numbers: pp.1-18

Abstract

The significant contribution of this paper is to present a comprehensive analy-
sis and design of π-point and band edge frequencies of reported helix SWSs
including not only a microwave but also millimeter-wave operation frequen-
cies considering the methods in available literature which are the Coupled
Mode Analysis (CMA), the Exact Floquet Approach (EFA), and the Auxiliary
Functions of Generalized Scattering Matrix (AFGSM) as a comparative study.
A different approach called as effective rod model is applied to circular/
T-shaped dielectric support rod helix SWSs in order to obtain ladder circuit
representation of one turn of related helix SWSs for the first time. Scattering
matrices of equivalent circuit representation of interested helix SWSs are
obtained by using microstrip line model of helix SWS which slits helical tape
at the effective helix radius along the direction normal to the helix winding
direction and flattens it out for the EFA, the AFGSM, and the CMA methods.
Additionally, comparisons are given for investigated methods together with
the results of Computer Simulation Technology (CST) design environme nt,
and good agreement has been observed among numerical results of different
helix SWSs in a broad frequency rangeThe significant contribution of this paper is to present a comprehensive analy-
sis and design of π-point and band edge frequencies of reported helix SWSs
including not only a microwave but also millimeter-wave operation frequen-
cies considering the methods in available literature which are the Coupled
Mode Analysis (CMA), the Exact Floquet Approach (EFA), and the Auxiliary
Functions of Generalized Scattering Matrix (AFGSM) as a comparative study.
A different approach called as effective rod model is applied to circular/
T-shaped dielectric support rod helix SWSs in order to obtain ladder circuit
representation of one turn of related helix SWSs for the first time. Scattering
matrices of equivalent circuit representation of interested helix SWSs are
obtained by using microstrip line model of helix SWS which slits helical tape
at the effective helix radius along the direction normal to the helix winding
direction and flattens it out for the EFA, the AFGSM, and the CMA methods.
Additionally, comparisons are given for investigated methods together with
the results of Computer Simulation Technology (CST) design environme nt,
and good agreement has been observed among numerical results of different
helix SWSs in a broad frequency range