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Narrow Band-Pass Waveguide Filter Using Frequency Selective Surfaces Loaded with Surface Mount Capacitors

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2 Author(s)
Amjadi, S.M. ; Iran Univ. of Sci. & Technol., Tehran ; Soleimani, M.

A new band pass narrow band, miniaturized and single resonance within a wide range of frequency band frequency selective surface structure loaded with surface mount capacitors suitable for low frequency and narrowband waveguide filter applications is presented. The filter structure consists of five unit cells in one direction with notch square ring elements each consists of two lumped capacitors placed on the transverse plane of the rectangular waveguide. To reduce the simulation time in design procedure, split-field update FDTD method is used for the analysis of the unit cell of the analogous infinite frequency selective surface at different oblique incidence of plane waves to predict the FSS performance in the waveguide. As an application, a waveguide filter has been designed to be used in an easy to fabricate and inexpensive S-band band-pass filter. By using surface mount capacitors, several undesirable higher order resonance frequencies near the dominant resonance frequency are eliminated and the waveguide filter dimensions are reduced considerably in one direction compared with the analogous waveguide filter without lumped capacitors.

Published in:

Electromagnetics in Advanced Applications, 2007. ICEAA 2007. International Conference on

Date of Conference:

17-21 Sept. 2007