Substrate Integrated Waveguide L-Shaped Iris for Realization of Transmission Zero and Evanescent-Mode Pole

This paper investigates L-shaped iris (LSI) embedded in substrate integrated waveguide (SIW) structures. A lumped element equivalent circuit is utilized to thoroughly discuss the iris behavior in a wide frequency band. This structure has one more degree of freedom and design parameter compared with...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2017-07, Vol.65 (7), p.2310-2320
Main Authors: Nosrati, Mehdi, Daneshmand, Mojgan
Format: Article
Language:English
Subjects:
Bandpass filter
Cutoff frequency
Design parameters
Equivalent circuits
evanescent-mode pole
Excitation
Filter design (mathematics)
Impedance
Iris
L-shaped iris (LSI)
Large scale integration
Load modeling
lumped element circuit analysis
substrate integrated waveguide (SIW)
Substrate integrated waveguides
transmission zero (TZ)
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Summary:This paper investigates L-shaped iris (LSI) embedded in substrate integrated waveguide (SIW) structures. A lumped element equivalent circuit is utilized to thoroughly discuss the iris behavior in a wide frequency band. This structure has one more degree of freedom and design parameter compared with the conventional iris structures; therefore, it enables design flexibility with enhanced performance. The LSI is utilized to realize a two-pole evanescent-mode filter with an enhanced stopband and a dual-band filter combining evanescent and ordinary modes excitation. Moreover, a prescribed filtering function is demonstrated using the lumped element analysis not only including evanescent-mode pole, but also close-in transmission zero. The proposed LSI promises to substitute the conventional posts in (SIW) filter design.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2017.2679011